Thermal energy meter
Multical® 303
Product categories
Heat / Cooling
MULTICAL® 303 is the compact all-round heat and cooling meter that can be installed everywhere due to its minimum dimensions. The meter can be turned during installation, even in the most compact systems, enabling you to always obtain optimal reading of the display. The robust metal flow sensor tolerates continuous temperatures of up to 130 ˚C, is effectively protected against condensation and can be used in both PN16 and PN25 installations.
Heat / Cooling
Ultrasonic
Wired
M-Bus
Wireless
wM-Bus
Smart Building
Your benefits
- Ultrasonic Technology:
Long-term stable energy measurement with highest measurement accuracy - Large dynamic range:
Measurement stability - Low pressure loss:
Energy efficiency in the grid and cost savings in dimensioning - Small and compact:
Suitable for tight installation spaces - Robust:
PN25 flow sensor, approved up to 130 °C
Applications
- Replacement of mechanical impeller heat meters
- Heat and/or cooling consumption measurement in building services engineering
Options
- M-Bus
- Wireless M-Bus, OMS T1 radio, 868 MHz (11-year battery life)
Downloads
Properties
- Nominal diameters from DN 15 to DN 20
- Nominal flow rates from qp 1.5 to qp 2.5
- Any installation position
- Low pressure loss
- Media temperature 2 to 90 °C at Compact mounting (up to 130 °C for wall mounting)
- Battery life up to 16 years (depending on environment and configuration conditions)
- Pt 500 temperature sensor
- Storage of the last 36 monthly and 20-year values
- Type testing / Approval:
- Heat:
Conformity according to the European Measuring Instruments Directive (MID)
- Cold: Swiss approval (METAS) including initial verification
Product information
Technical data
| MULTICAL® 303 Series | |||||
|---|---|---|---|---|---|
| Nominal diameter | DN | mm | 15 | 20 | 20 |
| Nominal flow rate | qp | m3/h | 1.5 | 1.5 | 2.5 |
| Connection thread on the meter | G...B | Inch | ¾ | 1 | 1 |
| Maximum flow rate | qs | m3/h | 3 | 3 | 5 |
| Minimum flow rate | qi | l/h | 15 | 15 | 25 |
| Starting value | l/h | 3 | 3 | 5 | |
| Kvs value | m3/h | 4.89 | 4.89 | 8.15 | |
| Maximum pressure | PN | 25 | |||
| Standard measuring range | qp / qi | 100:1 | |||
| Protection class | Calculator IP65 Flow sensor IP68 | ||||
Pressure loss
The pressure loss in a flow sensor is stated as the maximum pressure loss at qp.
According to EN 1434, the maximum pressure loss must not exceed 0.25 bar.
Mechanical design
- Top cover with front key and laser engraving
- PCB with microcontroller, flow-ASIC, display, etc.
- Base cover (may only be opened by an authorised laboratory)
- One or two A-cell batteries
- Flow sensor cover (may only be opened by an authorised laboratory)
- O-ring, temperature sensor
- Union, temperature sensor
- Temperature sensor (DS 27,5)
Mechanical data
| MULTICAL® 303 | |
|---|---|
| Weight (depending on the flow sensor size) | 0.7 kg – 0.8 kg |
| Ambient temperature | 5…55 °C. Non-condensing, closed location (indoor installation) |
| Media temperatures | 2…130 °C (At media temperatures below the ambient temperature or above 90 °C, wall-mounting of the calculator is recommended) |
| Medium in flow sensor | Water (district heating water as described in CEN TR 16911 and AGFW FW510) |
| Storage temperature | -25…60 °C (drained flow sensor) |
| Flow sensor cable | 1.5 m (the cable is non-detachable) |
| Temperature sensor cables | 1.5 m |
| Materials | |
|---|---|
| Case, coupling | Hot forged, dezincification-resistant brass (CW 602N) |
| Transducer | Stainless steel, W.nr. 1.4404 |
| O-rings | EPDM |
| Measuring tube | Thermoplastic, PES 30 % GF |
| Reflektors | Thermoplastic, PES 30 % GF and stainless steel, W.nr. 1.4306 |
| Flow sensor cover | Thermoplastic, PC 20 % GF |
| Wall bracket | Thermoplastic, PC 20 % GF |
| Calculator Top | Thermoplastic, PC 10 % GF with TPE (thermoplastic elastomer) |
| Calculator Base | Thermoplastic, PC/ABS |
| Cables | Silicone cable with inner Teflon insulation |
Approved meter data
| MULTICAL® 303 | |
|---|---|
| Heat meter | DK-0200-MI004-045 |
| Bifunctional heat/cooling meter | DK-0200-MI004-045 and TS 27.02 015 |
| Temperature range | θ: 2 °C…180 °C |
| Differential range | ∆Θ: 3 K…178 K |
| Total Temperature range | The stated minimum temperatures only relate to the type approval. The meter has no cut-off for low temperature and thus measures down to 0.01 °C and 0.01 K. |
| Standards and norms | EN 1434:2007/AC:2007 EN 1434:2015+A1:2018 EN 1434:2022 BEK1178 |
| EU directives | Measuring Instruments Directive Low Voltage Directive Electromagnetic Compatibility Directive Radio Equipment Directive RoHS Directive Pressurised equipment Directive |
| EN 1434 designation | Environmental class A |
| MID Mechanical environment | Class M1 and M2 |
| MID Electromagnetic environment | Class E1 |
| Temperature sensor | Pt500 – EN 60751 |
Accuracy
| Meter components | MPE according to EN 1434-1 | MULTICAL® 303, typical accuracy |
|---|---|---|
| Calculator | Ec= ± (0.5 + ∆Θ min/∆Θ) % | Ec= ± (0.15 + 2/∆Θ) % |
| Flow sensor | Ef = ± (2 + 0.02 qp/q), but not over ±5 % | Ef= ± (1 + 0.01 qp/q) % |
| Sensor set | Et= ± (0.5 + 3 ∆Θ min/∆Θ) % | Et= ± (0.4 + 4/∆Θ) % |
Total typical accuracy of MULTICAL® 303 compared to EN 1434-1.
Dimensioned sketches
Calculator
Calculator mounted with wall bracket
Temperature sensor
Flow sensor
| Flow sensor | ||||
|---|---|---|---|---|
| Thread | G | Inch | G¾B (R½) | G1B (R¾) |
| Total legth | L | mm | 110 | 130 |
| Total hight | H | mm | 70 | 70 |
| Total width | W | mm | 48 | 48 |
| Dimension A | A | mm | 12 | 22 |
| Dimension B1 | B1 | mm | 35 | 38 |
| Dimension B2 | B2 | mm | 35 | 38 |
| Dimension B3 | B3 | mm | 40 | 50 |
| Approx. weight | kg | 0.7 | 0.8 | |
Electrical data
| MULTICAL® 303 | |
|---|---|
| Display | LCD – 7 or 8 digits with a digit height of 6.8 mm (Standard 7) |
| Resolutions | 9999,999 – 99999,99 – 999999,9 – 9999999 99999,999 – 999999,99 – 9999999,9 – 99999999 |
| Energy units | MWh – kWh – GJ (Standard kWh) |
| Data logger contents | Programmable - all registers can be selected |
| Data logging interval | Programmable - from 1 minute to 1 year |
| Data Logging depth | Programmable - standard: 20 years, 36 months, 460 days, 72 hours |
| Info logger (EEPROM) | 50 info codes (50 latest are shown in the display) |
| Clock/calendar (with backup battery) | Clock, calendar, leap year compensation, target date |
| Daylight saving time/wintertime (DST) | Programmable The function can be disabled so that “technical normal time” is used |
| Clock accuracy | Without external adjustments: Less than 15 minutes/year With external adjustment every 48 hours: Less than 7 s from legal time |
| Data communication | KMP protocol with CRC16 is used for optical communication – |
| Power in temperature sensors | <10 µ W RMS |
| Supply voltage | 3.6 VDC ± 0.1 VDC |
| Battery type | 3.65 VDC 2 x A-cell |
| Battery life | Up to 16 years @ tBAT<30 °C The battery lifetime is affected by the meter’s communication and setup parameters as well as transmission interval, transmission power and datagram contents. |
| Lithium contents | 2 x approx. 0.9 g |
Installation note
MULTICAL® 303 does not require a straight inlet or outlet section. MULTICAL® 303 must not be exposed to pressures lower than ambient pressure (vacuum).
Installation Recommendations:
Severe flow disturbances usually occur in connection with valves and pumps that are not fully open, as well as with multiple bends. The minimum distances listed below have proven effective in the installation of thermal energy meters (best practice approach):
| Minimum recommended distances | Ultrasonic Flow sensor DN 15 - 50 | |
|---|---|---|
| With valves not fully open | 20 x DN | |
| On the pressure side of pumps | 20 x DN | |
| For multiple sheets | 5 x DN | |