Installation and Configuration

MULTICAL® 403
7.7 Information code types
MULTICAL® 403 constantly monitors a number of important functions. If a serious error occurs in measuring system
or installation, a flashing “INFO” will appear in the display. The ”INFO” field keeps flashing as long as the error is
present no matter which reading you choose. The ”INFO” field automatically disappears when the reason for the
error has been removed.
Note: Configuration for ”Manual reset of info code” is not possible in MULTICAL® 403
7.7.1 Information code types
In MULTICAL® 403 each digit of the info code is dedicated to one of the meter’s part elements. For instance the
second digit from the left in the display is always related to information on temperature sensor t1. At the same time
the info code is divided according to sections so that a reading from left to right consists of: General information,
temperature information (t1 and t2), flow information (V1) and information on pulse inputs A and B (In-A and In-B),
see table below for an overview of info codes.
Display digit
1 2 3 4 5 6 7 8 Description
Info t1 t2 0 V1 0 In-A In-B Bit format3
1 No voltage supply 1 1
2 Low battery level 2
9 External alarm (e.g. via KMP) 4
1 t1 Above measuring range or disconnected 8
1 t2 Above measuring range or disconnected 16
2 t1 Below measuring range or short-circuited 32
2 t2 Below measuring range or short-circuited 64
9 9 Invalid temperature difference (t1-t2) 128
3 V1 Air 256
4 V1 wrong flow direction4 512
6 V1 > qs for more than an hour 2048
8 Pulse input A Leakage in system 4096
9 Pulse input A. External alarm 16384
8 Pulse input B Leakage in system 2 8192
9 Pulse input B. External alarm 32768
1 This info code parameter does not appear from the current info code as it is only active when the meter is without
supply. The info code is saved in the info log, and it will appear from the info log that the meter has been without
power supply.
2 Info code for leakage at pulse input B, must be actively selected.
3 It is possible to see the information code in bit format using LogView HCW. In case of several simultaneous
information codes, the sum of all the codes will be shown. The information code is sent in bit format via data
communication as well.
4 This info code is set if there has been flow in the wrong direction for minimum 1% of qp for at least 10 minutes. It is
reset again at the first flow measurement with correct flow direction.
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Note: Info codes are configurable. Therefore, it is not certain that all above-mentioned parameters are available in a
given MULTICAL® 403. This depends on the selected country code.
7.7.2 Examples of information codes
Flashing ”INFO”
If the information code is different from
”00000000”, a flashing “INFO” will appear in the
meter’s display.
Current information code
The current info code can be displayed by
scrolling to the reading using the primary key on
the calculator front. When the current info code
is displayed ”INFO” stops flashing.
The current info code in the example indicates
that t1 is below measuring range or short-
circuited.
Info-event counter
If you activate
Current the meter’s secondary key when
INFO code
the info code is displayed you are informed how
many times the info code has been changed.
The value is increased every time the info code is
changed.
The info-event counter of a new meter will be 0
as transport state prevents counting during
transportation.
Info logger
If you activate the secondary key again, the info
code data logger is displayed.
The first display reading states the date of the
latest info code change.
The next activation of the secondary key displays
the info code from the above date. Repeated
activations of the secondary key alternately
induce dates and corresponding info codes.
The data logger saves 50 changes (all 50 changes
can be displayed).
Note: The info code is saved in the meter’s data logger too for diagnostic purposes.
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7.7.3 Information codes in display and in serial communication
Display
The info code types which are related to the meter’s different sensors t1, t2 and V1 will in case of error influence the
display readings, to which they are tied. In connection with current values for temperatures, flow and power three
horizontal lines will appear in the display, and the energy registers, in which counting is dependent on the sensor
function, will not be accumulated. See paragraphs 6 and 7.1.3 for further information on sensor errors.
Temperature sensor error
The error can be due to the sensor being disconnected or short-circuited. An erroneous ΔΘ alone will not be
considered a temperature sensor error.
In case of an error in one or more temperature sensors (t1 and t2), the value of the serial communication of the
sensor in question will be 0,00 °C (lowest valid temperature) or 185,00 °C (highest valid temperature) respectively,
depending on the measurement being below range (sensor short-circuited) or above range (sensor disconnected).
The display reading of the sensor in question shows lines in the three digits to the far right in the display,
independent of the cause of the error. Decimal points are not included.
The display readings of ΔΘ and current power will also show three lines for errors in one or more temperature
sensors. In serial communication the power value will be 0,0 kW.
Flow sensor error
The error can be due to air in the flow sensor (V1) or due to the fact that it has been mounted with the wrong flow
direction. V1 > qs does not prevent the meter from measuring, and is thus not considered an error in this connection.
In case of flow sensor error the flow value will in serial communication be 0 l/h. The display reading of current flow
shows lines in the three digits to the far right in the display. Decimal points are not included.
The display reading of current power will also show three lines for flow sensor error. In serial communication the
power value will be 0,0 kW.
Serial communication
Bit Value Info
0 1 Supply voltage disconnected
1 2 Low battery level
2 4 External alarm (e.g. via KMP)
3 8 t1 Above measuring range or switched off
4 16 t2 Above measuring range or switched off
5 32 t1 Below measuring range or short-circuited
6 64 t2 Below measuring range or short-circuited
7 128 Wrong Δt (t1-t2)
8 256 V1 Air
9 512 V1 Wrong flow direction
10 1024 -
11 2048 V1 Increased flow (flow1 > qs, for more than 1 hour)
12 4096 In-A Leakage in the system
13 8192 In-B Leakage in the system
14 16384 In-A External alarm
15 32768 In-B External alarm
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7.7.4 Information codes in transport state
The meter leaves the factory in transport state, i.e. the info codes are active in the display, but not in the meter's
data logger. This prevents ”info-event” from counting and saving non-relevant data in the info log during
transportation. The first time the meter registers flow after the installation, the info code automatically becomes
active.
7.8 Transport state
The meter is in transport state until it makes its first integration.
Transport state means:
- No info codes are saved in the meter’s logger and the info-event counter is not active.
- A power saving measuring sequence is used.
- ”SETUP loop” is accessible, which enables you to configure the meter before commissioning.
Note: In general ”SETUP loop” is available, it can however be limited by the selected country code.
Please be aware that the access to ”SETUP loop” will be blocked and the meter will leave transport mode if the
configuration in ”SETUP loop” is ended by the function “EndSetup”. When the meter has left transport state info
codes will be logged and the measuring sequence is changed to the one ordered for the meter (determined by the L-
code). The meter cannot revert to transport state, unless a total reset is made. The access to ”SETUP loop” can,
however, be opened again by separating calculator top and base, this means breaking the installation seal, see
paragraph 4.8.
Radio communication
On delivery the meter is in transport state and the meter’s radio communication is deactivated. The radio is
activated by the first integration the meter carries out. In transport state and after commissioning of the meter the
radio can be enabled either via ”SETUP loop” or by making a forced dial-up (both front keys are activated until
”CALL” is displayed). Enabling the radio does not cause the meter to leave transport state.
Test mode
Access to ”TEST loop” will disable radio communication. In ”TEST loop” an integration or a forced dial-up do not
enable the radio.
Note: In order to gain access to ”TEST loop” the test seal must be broken and the meter must subsequently be
reverified.
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Flow chart
-”SETUP loop”
-”SETUP loop”
-”TEST loop” (Requires breaking of the test seal)
- Total reset
*If the meter is in ”TEST loop” the radio remains
off at flow (integration) and forced call
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4 Installation
4.1 Installation requirements
Prior to installation of MULTICAL® 403 the heating system should be flushed while a fitting piece replaces the meter.
Remove the adhesive wafers from the flow sensor’s inlet and outlet and mount the flow sensor with
couplings/flanges. New fibre gaskets in original quality must be used.
If other couplings than the original ones from Kamstrup A/S are used you must make sure that the threaded lengths
of the couplings do not prevent proper tightening of the sealing surface.
The meter is configured for mounting of flow sensor in inlet or outlet before commissioning, see paragraph 6.3
about ”SETUP loop”. The flow direction is indicated by an arrow on the flow sensor.
In order to avoid cavitation the back pressure at the flow sensor (the pressure at the flow sensor outlet) must be
minimum 1 bar at qp and minimum 2 bar at qs, however 1,5 and 2,5 bar respectively for qp 15 flow sensor. This
applies to temperatures up to approx. 80 °C. See paragraph 4.5 regarding operating pressure.
When the installation has been completed, water flow can be turned on. The valve on the flow sensor's inlet side
must be opened first.
The flow sensor must not be exposed to lower pressure than ambient pressure (i. e. a vacuum).
Permissible operating conditions
Ambient temperature: 5…55 C (indoors). Max. 30 C for optimum battery lifetime.
Medium temperature of heat meter: 2…130 C with calculator mounted on a wall
15…90 C with calculator mounted on flow sensor
Medium temperature of cooling meter: 2…50 C with calculator mounted on a wall
Medium temperature of heat/cooling meter: 2…130 C with calculator mounted on a wall
System pressure: 1,0…25 bar for threaded meters
(See paragraph 4.4) 1,0…25 bar for flange meters, however ≥ 1,5 bar for qp 15
Electric installation
MULTICAL® 403 is available with either 24 VAC, 230 VAC or 24 VAC/VDC supply modules. The supply modules are
connected to mains using two-wire cable without protective earth.
Use a strong connection cable with an outer diameter of max. 5-8 mm and ensure correct cable stripping and cable
relief in the meter. It must be ensured that the entire installation complies with current rules. Supply cable to the
meter and/or safety transformer must never be protected by a larger fuse than allowed. In case of doubt, it is
recommended to seek counselling from a certified electrician. See paragraph 10 for more information about supply
possibilities.
Service
Neither welding nor freezing is allowed whilst the meter is mounted. Before starting such work, the meter must be
dismounted. If the meter is mains supplied, the supply must be switched off.
In order to facilitate replacement of the meter, closing valves should be mounted on both sides of the meter.
Under normal operating conditions no pipe strainer is required in front of the meter.
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4.2 Inlet prerequisites
Kamstrup’s flow sensors require neither straight inlet nor straight outlet to meet the Measuring Instruments
Directive (MID) 2014/32/EU, OIML R75:2002 and EN 1434:2015. A straight inlet section will only be necessary in case
of heavy flow disturbances before the meter. It is recommended to follow the guidelines in CEN CR 13582, Heat
meter installation. Instructions in selection, installation and use of heat meters.
Optimal position can be obtained, if you take the below installation recommendations into consideration.
C A Recommended flow sensor position.
B Recommended flow sensor position.
B D
C Unacceptable position due to risk of air
A
build-up.
D Acceptable position in closed systems.
Unacceptable position in open systems due
to risk of air build-up in the system.
E
E A flow sensor ought not to be placed
immediately after a valve, with the exception
of shut-off valves (full bore ball valve type),
which must be fully open when not used for
shutting off.
F
F A flow sensor ought not to be placed
immediately before (on the inlet side) or
immediately after (on the pressure side) a
pump.
G A flow sensor ought not to be placed
immediately after a double bend in two
planes.
G
Figure 2. General installation recommendations for flow sensors.
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4.3 Orientation of Kamstrup’s flow sensors
The recommended orientation of the flow sensor in an installation takes into account the metrological sensitivity of
the flow sensor to orientation, for example because of orientation-dependent flow profiles; poor water quality of
district heating water, e.g. dirt, which can accumulate in the flow sensor; air in the system and finally because of
environmental requirements, for example in case of condensation. The recommendations may vary for each of the
types because of their diversity in the design.
4.3.1 General recommendations
Kamstrup’s flow sensors can be
mounted vertically, horizontally or at
an angle.
If Kamstrup flow sensors are vertically
mounted, they can be turned ±360°
around the pipe axis.
Important!
The plastic box should be placed on
the side (at horizontal mounting). See
below for additional details.
Figure 3. Separate mounting of Kamstrup flow sensors. Vertically, horizontally or at an angle.
At horizontal mounting, Kamstrup’s flow sensors can be turned around the pipe axis. Acceptable angles of rotation
for the various types of Kamstrup flow sensors can be seen Figure 4 and Figure 5.
At medium temperatures above 90 °C and below ambient temperature, i.e. for cooling applications, calculator and
Pulse Transmitter/Pulse Divider must not be mounted on the flow sensor. Instead wall-mounting is recommended.
The orientation of the flow sensor in a cooling application does therefore not need to take the readability of the
calculators display into account and can thereby be limited to the optimum orientation of the flow sensor only.
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4.3.2 Recommendations for heat applications
Heat applications
Threaded meter housing with qp ≤ 2,5 m3/h Threaded meter housing with qp ≥ 3,5 m3/h
and flange meters
(a) (b)
Figure 4. Acceptable orientation of Kamstrup flow sensors around the pipe axis
for heating applications at horizontal mounting. (a) Threaded meter housings with qp ≤ 2,5 m3/h.
(b) Threaded meter housings with qp ≥ 3,5 m3/h and flange meters.
Note: The orientations marked with “!” are conditionally accepted, when the assumptions below are fulfilled.
(1) District heating/cooling water must be clean and must not contain any kind of dirt. Dirt can otherwise be
deposited on the transducers of the flow sensor, which affects their ability to detect and transmit the
ultrasound signal.
(2) District heating water must be free of air. Air bubbles will interfere severely with the ultrasound signal.
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4.3.3 Recommendations for cooling and combined heat/cooling applications
Cooling and combined heat/cooling applications
Threaded meter housing with qp ≤ 2,5 m3/h Threaded meter housing with qp ≥ 3,5 m3/h
and flange meters
(a) (b)
Figure 5.
Recommended orientation of Kamstrup flow sensors around the pipe axis at horizontal mounting
for cooling and combined heat/cooling applications.
(a) Threaded meter housings with qp ≤ 2,5 m3/h.
(b) Threaded meter housings with qp ≥ 3,5 m3/h and flange meters.
Note: District heating and cooling water must be free of air. Air bubbles will interfere severely with the ultrasound
signal. If there is risk of air, mount all flow sensors like in position (a) with the transducers to the side.
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4.3.4 Recommendations for directly mounted temperature sensors
When mounting a temperature sensor directly in the outlet of the flow sensor, acceptable orientations for the
temperature sensor must be taken into account. For heating applications (Figure 6 (a)), the orientation of a
temperature sensor is not important as long as a homogeneous temperature distribution can be assumed, i.e. all
orientations can be accepted. For cooling applications (Figure 6 (b)), water penetration into the sensor element must
be avoided. Therefore, a temperature sensor is mounted ideally from the bottom pointing with its tip upwards and
can be rotated up to a horizontal position.
(a) (b)
Figure 6. Acceptable orientation of a temperature sensor in (a) a heating and (b) a cooling application.
These recommendations for temperature sensor installation comply with the recommendations for flow sensor
installation illustrated in Figure 4 and Figure 5. However, while a temperature sensor can well be directly installed in
a flow sensor for cooling application mounted in an ascending pipe, it must not be mounted in a flow sensor for
cooling application mounted in a descending pipe.
The flow sensor can be used in both PN16 and PN25
installations and is delivered marked with
PN16/PN25.
The blind plug delivered mounted in the MULTICAL
403 flow sensor and the direct short sensor from
Kamstrup A/S may be used in connection with both
PN16 and PN25.
Any supplied extensions and couplings can be used
for both PN16 and PN25.
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4.4 Mounting of MULTICAL® 403 calculator
4.4.1 Compact mounting
Compact mounting means that the calculator is
mounted directly on the flow sensor. If there is risk
of condensation (e.g. in cooling applications), the
calculator ought to be wall mounted. Furthermore,
MULTICAL 403 in cooling applications must be the
condensation-proof version, type 403-T/C.
The construction of MULTICAL 403 can provide
minimum installation depth, both at 45° and 90°
mounting of the flow sensor. Due to the design the
mounting radius remains 60 mm in critical places.
4.4.2 Wall mounting
The calculator can be mounted directly on an even
wall. Wall mounting requires a wall fitting (3026-
655), which is available as an accessory to
MULTICAL 403. MULTICAL 403 is mounted on the
wall fitting by sliding the calculator onto the fitting in
the same way as it is done by compact mounting.
Note: Regarding qp 3,5 and bigger flow sensors the
fitting on the flow sensor can be dismounted and
used as a wall bracket.
4.4.3 Position of calculator
If the flow sensor is installed in humid or condensing
environment, the calculator must be wall mounted
and positioned higher than the flow sensor.
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4.5 Operating pressure of MULTICAL® 403
In connection with installations it has proved practical to work with minimum the pressure mentioned in table 2
below:
Recommended back Recommended back
Nominal flow qp Max. flow qs
pressure pressure
[m³/h] [m³/h]
[bar] [bar]
0,6…10 1 1,2...20 2
15 1,5 30 2,5
Table 2: Recommended back pressure at various flow sensor sizes
The values in the table apply to temperatures up to approx. 80 °C
The purpose of recommended back pressure is to avoid measuring errors as a result of cavitation or air in the water.
Cavitation does not necessarily happen in the sensor itself, but can also occur as air bubbles created by pump
cavitation and regulating valves mounted before the sensor. It can take considerable time until such bubbles have
been dissolved in the water.
Furthermore, water can include dissolved air. The amount of air which can be dissolved in water depends on
pressure and temperature. This means that air bubbles can be formed due to a pressure drop in the installation, e.g.
caused by a velocity rise in a contraction or above the sensor.
The risk of influence from the above is reduced by maintaining a fair pressure in the installation.
In relation to table 2, the steam pressure at current temperature must be considered too. The values in the table
apply to temperatures up to approx. 80 °C. The graph in Diagram 2 applies to higher temperatures. Furthermore, it
must be taken into consideration that the mentioned pressure is the back pressure at the flow sensor outlet and that
the pressure is lower in a contraction than before one, e.g. in case of cones. This means that the pressure, if
measured elsewhere in the installation, may differ from the pressure at the flow sensor.
The explanation of pressure drop due to velocity increase is found by combining the continuity equation and
Bernoulli’s equation. The total energy from the flow will be the same at any cross section.
It can be reduced to: P + ½v = constant.
where: P = pressure,  = density, v = velocity.
Dimensioning a flow sensor you must take the above into account, especially if the sensor is used in the area
between qp and qs described in EN 1434 , and in case of heavy contractions of the pipe.
Steam pressure
3
2.5
2
[bar]
1.5
1
0.5
0
80 85 90 95 100 105 110 115 120 125 130
[°C]
Diagram 2. Steam pressure as a function of temperature
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4.6 Mounting in inlet or outlet
MULTICAL® 403 is configured for mounting of flow sensor in either inlet or outlet. In the display the flow sensor
position is indicated by a symbol, subjacently the A-code of the program number is selected as 3 or 4 for flow sensor
mounting in inlet and outlet respectively. The table below indicates installation conditions of heat meters and
cooling meters:
A-code and Hot Cold
Formula k-factor Installation
display pipe pipe
A-code = 3
k-factor for t1 Display V1 and
t2
and V1 in inlet t1
Heat meter
E1=V1(t1-t2)k
A-code = 4
k-factor for t2
Display V1 and
and V1 in t1
t2
outlet
A-code = 3
k-factor for t1 Display V1 and
t2
and V1 in inlet t1
Cooling meter
E3=V1(t2-t1)k
A-code = 4
k-factor for t2
Display V1 and
and V1 in t1
t2
outlet
4.7 EMC conditions
MULTICAL® 403 has been designed and CE-marked according to EN 1434 Class A and C (corresponding to
Electromagnetic environment: Class E1 and E2 of the Measuring Instruments Directive) and can thus be installed in
both domestic and industrial environments.
All control cables must be drawn separately and not parallel to e.g. power cables or other cables with the risk of
inducing electromagnetic interference. There must be a distance of min. 25 cm between signal cables and other
installations.
4.8 Climatic conditions
MULTICAL® 403 is designed for indoor installation in non-condensing environments with ambient temperatures from
5…55 C, however max. 30 C in order to obtain optimal battery lifetime. Protection class IP54 of calculator allows
splashes of water, but the calculator must not be submerged. The protection class of the flow sensor is IP68, which
means that it stands submergence.
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4.9 Sealing
According to EN 1434 MULTICAL® 403 must have protection devices, which can be sealed to the effect that after
sealing, both before and after the heat meter has been correctly installed, it is impossible to dismount, remove or
change the heat meter or its adjustment devices without visibly damaging meter or sealing. Correct sealing of
MULTICAL® 403 includes two levels, installation sealing and verification sealing; a breaking of the sealing has
different consequences on each level.
Installation sealing
Having completed the installation of MULTICAL® 403 installation sealing is the last thing to be done. The installation
seal is the ‘outermost’ sealing level to be completed by the installer/utility. The Installation sealing must make sure
that calculator top and base cannot be separated and that temperature sensors cannot be dismounted without
visible signs that a separation has taken place. In practice the installation sealing can be done by means of wire and
seal, sealing label or a combination of the two. The sealing is the utility’s security that unauthorized persons cannot,
undiscovered, change the installation around the meter. Breaking the installation sealing alone does not influence
the meter’s possibility of renewed installation sealing, or the fact that it is legal in relation to its approval and
verification.
Installation sealing and ”SETUP loop”
In order to bring MULTICAL® 403 back to ”SETUP loop” after installation, calculator top and base must be separated,
after which ”SETUP loop” can be accessed either via front keys or via METERTOOL HCW. Separation of calculator top
and base implies that the calculator’s installation seal is broken.
Verification seal
The verification sealing of MULTICAL® 403 consists of both mechanical and electronical sealing. The verification seals
marked “LOCK” and “TEST” are placed on the grey verification cover in the calculator top. These seals can be seen as
the ‘innermost’ sealing level, which may only be broken by authorized laboratories in connection with test and
reverification of the meter. If the meter is to be used for legal operation in relation to approval and verification after
breaking of the verification sealing, the broken seals must be resealed. The sealing must be carried out by an
authorized laboratory using the sealing mark (void label) of the laboratory.
4.10 Pressure loss
Pressure loss in a flow sensor is stated as max. pressure loss at qp. According to EN 1434 maximum pressure must
not exceed 0.25 bar.
The pressure loss in a sensor increases with the square of the flow and can be stated as:
Q  kv p
where:
Q = volume flow rate [m³/h]
kv = volume flow rate at 1 bar pressure loss [m³/h]
p = pressure loss [bar]
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Graph qp Nom. diameter Δp@qp kv q@0,25 bar
[m³/h] [mm] [bar] [m³/h]
A 0,6 DN15/DN20 0,03 3,46 1,7
B 1,5 DN15/DN20 0,09 4,89 2,4
C 2,5 DN20 0,09 8,15 4,1
D 3,5 DN25 0,07 13,42 6,8
E 6 DN25 0,06 24,5 12,3
F 10 DN40 0,06 40,83 20,4
F 15 DN50 0,14 40,09 20,1
Table 3: Pressure loss table
Δp MULTICAL® 403
A B C D E F
1
Δp [bar]
0.1
0.01
0.1 1 10
Flow [m³/h]
Diagram 3: Pressure loss graphs
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5 Dimensioned sketches
Note: All measurements in [mm]
Figure 7: Mechanical measurements of calculator
Figure 8: Wall bracket Figure 9: Mounted with wall bracket
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Figure 10: Flow sensor with G¾ and G1 thread connection
Thread EN ISO 228-1
Approx.
Nominal flow Thread
L A B1 B2 B3 weight
qp [m3/h] G
kg 1
0,6 + 1,5 G¾ 110 12 35 32 38 0,9
1,5 G¾ 165 12 35 32 65 1,0
1,5 G1 130 22 38 32 48 1,0
2,5 G1 130 22 38 38 48 1,0
0,6 + 1,5 G1 190 22 38 38 78 1,1
2,5 G1 190 22 38 38 78 1,2
1 Weight of calculator, flow sensor and 3 m sensor set excl. packing
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Figure 11: Flow sensor with G5/4 and G2 threaded connection
Thread EN ISO 228-1
Approx.
Nominal flow Thread
L M H2 A B1 B2 H1 weight
qp [m3/h] G
kg 1
3,5 G5/4 260 130 88 16 51 20 41 2,0
6 G5/4 260 130 88 16 53 20 41 2,1
10 G2 300 150 88 40,2 55 29 41 3,0
1 Weight of calculator, flow sensor and 3 m sensor set excl. packing
Figure 12: Flow sensor with DN25, DN40 and DN50 flange connection
Flange facing type B, raised face in accordance with EN 1092-1, PN25
Approx.
Nominal flow Nom. Bolts weight
qp [m3/h] diameter L M H2 D H K Number Thread d2 kg 1
DN
6 DN25 260 130 88 115 106 85 4 M12 14 4,6
10 DN40 300 150 88 150 140 110 4 M16 18 7,5
15 DN50 270 155 88 165 145 125 4 M16 18 8,6
1 Weight of calculator, flow sensor and 3 m sensor set excl. packing
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6 Display
MULTICAL® 403 has a bright and clear display including 7 or 8 digits depending on configuration as well as a number
of symbols for measuring units, info, inlet and outlet, radio on/off etc. The display is switched on by pressing either
the primary or the secondary key on the meter’s front. Depending on the selected integration mode (L-code) the
display either switches off 8 min. after the latest activation of a key or remains switched on. Thus the selected
integration mode influences the meter’s battery lifetime. Read more about battery lifetime in paragraph 10.4 and
more about the meter’s integration modes in paragraph 3.2.7.
1 The meter is configured as inlet or outlet meter 6 Date, time and address
Heart beat indication shows that both meter and
2 Flashes at active info code 7
display are active
”OK” is displayed when a changed value has been
3 Historical readings 8
saved
4 Tariff registers/tariff limits 9 The meter’s radio communication is switched on or off
5 Measuring unit
The meter uses four different display loops. The four loops are intended for four different usage situations.
• ”USER loop”
The meter’s configurable display loop, which is intended for the user. The readings in this loop can be adjusted
to the requirements via the DDD-code. See paragraph 3.2.4 for an overview of possible readings in the meter’s
”USER loop”. The same paragraph includes examples of DDD-codes.
• ”TECH loop”
This loop is intended for technicians and is not configurable. The loop displays all the meter’s readings. The loop
includes readings like serial number, date, time, config number, software revision and segment test. See
paragraph 6.2 for a complete overview of the readings.
• ”SETUP loop”
”SETUP loop” is also intended for the technician. In this loop the technician can configure the meter via the front
keys. In general (unless otherwise requested by the customer) the loop is open in transport state. When the first
integration has been carried out by the meter, the access to ”SETUP loop” is blocked. From now on it is no longer
possible to access ”SETUP loop” unless you break the installation seal. See paragraph 6.3 for further details
about the various parameters which can be configured in ”SETUP loop” and see paragraph 7.8 for details on the
meter’s transport state.
• ”TEST loop”
Used by authorized laboratories for reverification of the meter. This loop is not available unless the meter’s test
seal (verification seal) is broken.
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By means of the meter’s primary key you can choose from and switch between the four display loops. When
delivered the meter is in transport state, which means that USER, TECH and ”SETUP loop”s are available. Depending
on country code, the access to ”SETUP loop” can be blocked in transport state and is thereby not available on
delivery. ”TEST loop” can only be accessed if the test seal (verification seal) is broken.
Keeping the primary key activated for 5, 7 and 9 seconds respectively you can change between the meter’s display
loops. ”TECH loop”, ”SETUP loop” and ”TEST loop” use index numbers as the readings in these display loops are
allocated to a specific index number. The index numbers facilitate navigation to the required reading. Index numbers
are not used in the configurable ”USER loop”. The below figure illustrates, how it is possible to navigate in the
meter’s display by means of the primary key.
In order to facilitate the diagnostics work, lines are shown in the display readings (current values) which are
influenced by any errors, and at the same time counting stops in the registers, which are influenced by the error. In
case of interrupted or short-circuited temperature sensor the corresponding display reading will include lines. No
lines are shown for flow measurement in case of flow sensor error “wrong flow direction” as this error does not
prevent the meter from measuring. If the flow sensor is prevented from measuring, e.g. due to air in the flow sensor,
the reading includes lines. The meter registers these errors and sets an info code, which can easily be read from the
meter’s display. Read more about the meter's info codes in paragraph 7.7.
Temperature sensor t2 error Flow sensor error
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t1 error t2 error Flow error
t1 inlet Display - - -
t2 outlet Display - - -
t (t1-t2) Display - - - Display - - -
Flow, V1 Display - - -
Power, V1 Display - - - Display - - - Display - - -
E1 No counting No counting No counting
E3 No counting No counting No counting
E8 No counting No counting
E9 No counting No counting
V1 No counting
A1 No counting No counting No counting
A2 No counting No counting No counting
TA2 No counting No counting No counting
TA3 No counting No counting No counting
TA4 No counting No counting No counting
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2 Technical data
2.1 Approved meter data
Approvals DK-0200-MI004-037, heat meter
According to MID 2014/32 EU,
EN 1434:2007/AC:2007,
EN 1434:2015 + A1:2018,
EN 1434:2022 and
WELMEC 7.2:2021
TS 27.02 009, cooling meter and cooling/heat meter
According to DK-BEK 1178 ,
EN 1434:2007/AC:2007,
EN 1434:2015 + A1:2018 and
EN 1434:2022
EU directives Measuring Instruments Directive, Low Voltage Directive,
Electromagnetic Compatibility Directive, Pressurized Equipment Directive,
Radio Equipment Directive, RoHS Directive
Heat meter approval DK-0200-MI004-037
Temperature range : 2 °C…180 °C The stated minimum temperatures are
Differential range : 3 K…178 K related to the type approval.
The meter has no cut-off for low
Cooling meter and cooling/heat meter TS 27.02 009 temperature and thus measures as low
Temperature range : 2 °C…180 °C temperatures as
Differential range : 3 K…178 K 0,01 °C and 0,01 K.
Differential range, cut-off 0,00…2,50 K
Temperature of medium q: 2 °C…130 °C
Accuracy
- Calculator Ec =  (0,5 +  min/) %
- Flow sensor Ef =  (2 + 0,02 qp/q), but not exceeding ±5 %
Temperature sensor connection Type 403-W/T/C Pt500 – EN 60 751, 2-wire connection
EN 1434 designation Environmental class A and C
MID designation Mechanical environment: Class M1 and M2
Electromagnetic environment: Class E1 and E21)
Condensing environment, closed location
(indoors), 5…55 °C
1) From 2023, MULTICAL® 403 can be marked both as E1 or E2
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Nom. Max. Min. Dynamic Min. Saturation Pressure Connection Length
flow flow flow range flow flow loss on meter
cut-off p @ qp
qp qs qi
Type number  m3/h   m3/h  l/h qp:qi l/h  m3/h  bar mm
403-x-10 0,6 1,2 6 100:1 3 1,5 0,03 G¾B 110
403-x-30 0,6 1,2 6 100:1 3 1,5 0,03 G1B 190
403-x-40 1,5 3,0 15 100:1 3 4,6 0,09 G¾B 110
403-x-42 1,5 3,0 6 250:1 3 4,6 0,09 G¾B 110
403-x-50 1,5 3,0 15 100:1 3 4,6 0,09 G¾B 165
403-x-52 1,5 3,0 6 250:1 3 4,6 0,09 G¾B 165
403-x-60 1,5 3,0 15 100:1 3 4,6 0,09 G1B 110
403-x-70 1,5 3,0 15 100:1 3 4,6 0,09 G1B 130
403-x-72 1,5 3,0 6 250:1 3 4,6 0,09 G1B 130
403-x-80 1,5 3,0 15 100:1 3 4,6 0,09 G1B 165
403-x-82 1,5 3,0 6 250:1 3 4,6 0,09 G1B 165
403-x-90 1,5 3,0 15 100:1 3 4,6 0,09 G1B 190
403-x-92 1,5 3,0 6 250:1 3 4,6 0,09 G1B 190
403-x-A0 2,5 5,0 25 100:1 5 7,6 0,09 G1B 130
403-x-A2 2,5 5,0 10 250:1 5 7,6 0,09 G1B 130
403-x-B0 2,5 5,0 25 100:1 5 7,6 0,09 G1B 190
403-x-B2 2,5 5,0 10 250:1 5 7,6 0,09 G1B 190
403-x-D0 3,5 7,0 35 100:1 7 9,2 0,07 G5/4B 260
403-x-D2 3,5 7,0 14 250:1 7 9,2 0,07 G5/4B 260
403-x-F0 6,0 12 60 100:1 12 18 0,06 G5/4B 260
403-x-F2 6,0 12 24 250:1 12 18 0,06 G5/4B 260
403-x-G0 6,0 12 60 100:1 12 18 0,06 DN25 260
403-x-G2 6,0 12 24 250:1 12 18 0,06 DN25 260
403-x-H0 10 20 100 100:1 20 30 0,06 G2B 300
403-x-H2 10 20 40 250:1 20 30 0,06 G2B 300
403-x-J0 10 20 100 100:1 20 30 0,06 DN40 300
403-x-J2 10 20 40 250:1 20 30 0,06 DN40 300
403-x-K0 15 30 150 100:1 30 46 0,14 DN50 270
403-x-K2 15 30 60 250:1 30 46 0,14 DN50 270
Table 1
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2.2 Electrical data
Calculator data
Typical accuracy Calculator: Ec  (0,15 + 2/) % Sensor set: Et  (0,4 + 4/) %
Display LCD – 7 or 8 digits, digit height 8,2 mm
Resolutions 9999,999 – 99999,99 – 999999,9 – 9999999
99999,999 – 999999,99 – 9999999,9 – 99999999
Energy units MWh – kWh – GJ
Data logger (EEPROM), Logging intervals: From one minute to one year
Programmable Logger content: All registers can be selected
Standard logger profile: 20 years, 36 months, 460 days, 72 hours
Info logger (EEPROM) 50 info codes
Clock/calendar Clock, calendar, leap year compensation, target date
(with back-up battery)
Clock deviation Unadjusted by AMR: Less than 15 min./year from legal time
Adjusted by AMR every 48 hrs: Less than 7 sec. from legal time
Summer/winter time (DST) Programmable under country code.
The function can be disabled so that ”technical normal time” is used
Data communication KMP protocol with CRC16 used for optical communication
as well as modules.
Power of temperature  10 W RMS
sensors
Supply voltage 3,6 VDC ± 0,1 VDC
Battery 3,65 VDC, D-cell lithium 3,65 VDC, 2 x A cells lithium 3,65 VDC, C-cell lithium1
Replacement interval
- Wall mounted 16 years @ tBAT  30 °C 9 years @ tBAT  30 °C
- Mounted on flow sensor 14 years @ tBAT  40 °C 8 years @ tBAT  40 °C
See paragraph 10.4 for further information.
Back-up battery 3,0 VDC, BR-cell lithium
(for real time clock) Lifetime: 20 years @ tBAT  40 °C with connected battery/supply or
4 years @ tBAT  40 °C without connected battery/supply
Mains supply 230 VAC +15/-30 %, 50/60 Hz
24 VAC ±50 %, 50/60 Hz
Insulation voltage 3,75 kV
Power consumption 1W
Back-up supply Integral SuperCap eliminates interruptions due to short-term power failures
(Supply modules type 403-xxxxxxxxxxx7 and -8 only)
EMC data Fulfils EN 1434 class A and C (MID class E1 and E2)
1 For especially current-demanding applications, such as battery operation of an NB-IoT module. This battery package
includes a lithium C-cell as well as a special capacitor that helps the battery to deliver high pulse currents.
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Temperature measurement t1 t2  (t1-t2)  (t2-t1) t5
Inlet Outlet Heat Cooling Preset
temperature temperature measurement measurement of A1 and A2
Measuring
403-W/T/C 0,00…185,00 C
range
2-W Pt500
Offset adjustment ± 0,99 K joint zero point adjustment for inlet and outlet temperatures
See paragraph 7.3
Max. cable lengths
Pt500, 2-wire
(Max. ø6
mm cable) 2 x 0,25 mm2: 10 m
Pulse inputs A and B Electronic switch Reed-switch
In-A 65-66 and In-B: 67-68 via module
Pulse input 680 k pull-up to 3,6 V 680 k pull-up to 3,6 V
Pulse ON  0,4 V i  30 ms  0,4 V i  500 ms
Pulse OFF  2,5 V i  30 ms  2,5 V i  500 ms
Pulse frequency  3 Hz  1 Hz
Electrical isolation No No
Max. cable length 25 m 25 m
Requirements to ext. contact Leak current at function open  1 A
Pulse outputs C and D
Out-C: 16-17 and Out-D: 18-19 via module
Meter factor Heat meter: Out-C = CE+
Out-D = CV
Cooling meter: Out-C = CE-
Out-D = CV
Heat/cooling meter: Out-C = CE+
Out-D = CE-
Communications module HC-003-11 (Before 2017-05) HC-003-11 (After 2017-05)
HC-003-21 & -31 (Before 2018-04) HC-003-21 & -31 (After 2018-04)
Pulse output type Open collector (OB) Opto FET
External voltage 5…30 VDC 1…48 VDC/AC
Current < 10 mA < 50 mA
Residual voltage UCE ≈ 1 V at 10 mA RON ≤ 40 
Electrical isolation 2 kV 2 kV
Max. cable length 25 m 25 m
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2.3 Mechanical data
Environmental class Fulfils MID class M1 and M2
Ambient temperature 5…55 °C, condensing, closed location (installation indoors)
Protection class Calculator: IP54 Flow sensor: IP68 According to EN/IEC 60529
Medium temperatures
Heat meters 403-W 2…130 °C At medium temperatures below ambience or above 90 °C
Cooling meters 403-C 2…50 °C in flow sensor we recommend that the calculator is wall
Heat/cooling meters 403-T 2…130 °C mounted.
Medium in flow sensor Water (district heating water as described in AGFW FW510)
Storage temperature -25…60 °C (drained flow sensor)
Pressure stage PN16/PN25, PS25
Weight From 0,9 to 8,6 kg depending on flow sensor size
Flow sensor cable 1,5 m (cable undemountable)
Connecting cables ø3,5…6 mm
Supply cable ø5…8 mm
2.4 Materials
Wetted parts Case, thread Hot-pressed dezincification proof brass (CW 602N)
Case, flange Stainless steel, material no. 1.4308
Transducer Stainless steel, material no. 1.4404
O-rings EPDM
Measuring tube Thermoplastic, PES 30 % GF
Reflectors Thermoplastic, PES 30 % GF and stainless steel, material no. 1.4306
Flow sensor case Top/wall bracket Thermoplastic, PC 20 % GF
Calculator case Top and base Thermoplastic, PC 10 % GF with TPE (thermoplastic elastomer)
Verification cover Thermoplastic, PC 10 % GF
Cables Silicone cable with inner Teflon insulation
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2.5 Accuracy
Heat meter components MPE according to EN 1434-1 MULTICAL® 403, typical accuracy
Flow sensor Ef =  (2 + 0,02 qp/q), but not exceeding ±5 % Ef =  (1 + 0,01 qp/q) %
Calculator Ec =  (0,5 +  min/) % Ec =  (0,15 + 2/) %
Sensor set Et =  (0,5 + 3  min/) % Et =  (0,4 + 4/) %
MULTICAL® 403 qp 1,5 m³/h @ 30K
Ec+Et+Ef (EN) Ec+Et+Ef (Typ)
6,0
4,0
2,0
Tol [%]
0,0
0,01 0,10 1,00 10,00
-2,0
-4,0
-6,0
q [m³/h] qp qs
qi
Diagram 1: Total typical accuracy of MULTICAL® 403 compared to EN 1434-1.
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6.1 ”USER loop”
”USER loop” is the meter’s primary loop, which includes legal and mostly used readings. The loop is intended for the
user and is configured according to the user’s requirements via the DDD-code. See paragraph 3.2.4 for further
information on ”USER loop” and DDD-codes.
Note: No display index numbers are used in ”USER loop”.
6.2 ”TECH loop”
”TECH loop” is intended for the technician, who is interested in viewing more readings than the ones available in
”USER loop”.
”TECH loop” is not configurable and includes all the meter’s readings as well as module readings. ”TECH loop”
comprises a number of fixed module readings as well as a number of module readings, which depend on the
installed module.
Note: Module readings can be empty due to delay or interrupted communication between meter and module. Heart
beat indication shows that both meter and display are active
The meter’s ”TECH loop” is shown below. A brief activation of the primary key makes the display reading shift to the
next primary reading, whereas a brief activation of the secondary key results in a change to secondary reading.
Index Logger
number in depth in Reference
display display numbers
Primary key Secondary key
1 Heat energy (E1) 2-001-00
1.1 Date of yearly logger 2-001-01
Log 01-02
1.2 Data of yearly logger 1 2-001-02
1.3 Date of monthly logger 2-001-03
Log 01-12
1.4 Data of monthly logger 1 2-001-04
2 Cooling energy (E3) 2-002-00
2.1 Date of yearly logger 2-002-01
Log 01-02
2.2 Data of yearly logger 1 2-002-02
2.3 Date of monthly logger 2-002-03
Log 01-12
2.4 Data of monthly logger 1 2-002-04
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