Calculator
MULTICAL® 803
Product categories
Heat / Cooling
Heat / Cooling
Ultrasonic
System technology
Wired
Impulse,
M-Bus,
Modbus,
BacNET
Wireless
wM-Bus,
LoRaWAN
Smart City
Smart Building
Your benefits
- Ultrasonic technology:
Long-term stable energy measurement with maximum measurement accuracy - Large illuminated display:
Easy to read - Built-in 24 V DC auxiliary power supply:
No external transformer installation required - Auto detect function:
Automatically detects ULTRAFLOW® and sensor type - Comprehensive data logger:
Instant access to information for analysis and optimization purposes - Option cards for various functions:
- Affordable base unit
- Additional functions can be added later - CH refrigeration certification (METAS) incl. initial calibration:
Approved for use in commercial transactions
Applications
- Energy measurements for district heating supplies
- Heat and/or cooling consumption measurement in building services engineering
- Arithmetic unit for local or remote reading
- Leakage and pipe burst monitoring in district heating systems
Options
- Mixed fluid version (803-M) available on request
- Option cards for
- M-Bus / 2 water meter inputs
- M-Bus / 2 pulse outputs energy + volume
- Radio OMS T1, 868 MHz
- 2 active analog outputs 0/4…20 mA (mains power supply required)
- LonWorks, TP/FT-10 / 2 water meter inputs (high-power power supply required)
- BACnet MS/TP (RS485) / 2 water meter inputs (mains power supply required)
- Modbus RTU (RS485) / 2 water meter inputs (mains power supply required)
- Modbus TCP-IP / 2 water meter inputs (high-power power supply required)
- BACnet IP / 2 water meter inputs (high-power power supply required)
- LoRaWAN int./ext. antenna
Downloads
Electrical diagram MULTICAL® 803 (DE)
Electrical diagram OPTIFLUX 4300W MULTICAL® UD (DE)
Electrical diagram OPTIFLUX 4300W MULTICAL® BD (DE)
Electrical diagram WATERFLUX 3300W MULTICAL® UD (DE)
Electrical diagram WATERFLUX 3300W MULTICAL® BD (DE)
Connection diagram for option cards (DE)
2026_EU Declaration of Conformity_MULTICAL_803
Properties
- Electronic calculator
- LCD display, resolution 7 or 8 digits, with backlighting
- Non-volatile EEPROM memory
- 4 module slots for option cards
- 6 years battery backup
- Pt 500 temperature sensor, 2-/4-wire technology
- Standard EN 1434
- Mains supply 230 V AC
- IP65 protection class
- Pulse output energy + volume
- Can be combined with the following volume measuring elements: ULTRAFLOW®, impeller meter with reed pulse generator and magnetic-inductive meter
- Type testing/approval: Heat:
Conformity with European Measuring Instruments Directive (MID) / Cold: CH approval (METAS) incl. initial calibration
Product information
Technical Data
| Performance data for the MULTICAL® 803 calculator | |
|---|---|
| Temperature measurement range | 2 to 180 °C |
| Temperature difference measuring range | 3 to 170 K |
| Temperature resolution on display | 0,01 °C |
| LCD resolution | 7 or 8 digits with a digit height of 10 mm |
| Resolution of the display | 9999,999 – 99999,99 – 999999,9 – 9999999 99999,999 – 999999,99 – 9999999,9 – 99999999 |
| Energy display unit | MWh |
| Display unit Power | m3 |
| Display unit Volume | l/h |
| Display unit Flow rate | kWh |
| Standard programming GWF for pulse value of volume measuring part with reed pulse generator | 1 pulse = 2,5 liters |
| Protection class | IP65 |
| Environmental class | A and C according to EN 1434 |
| Ambient temperature | +5 to + 55 °C (non-condensing) |
| Storage temperature | -20 to + 60 °C |
| Display unit for consumption meters 1+2 | m3 |
| Weight | app. 1,15 kg |
| Power supply | |
|---|---|
| Power supply | 230 V AC +15/-30 %, 50/60 Hz |
| Power consumption | 7 W for powering 4 communication modules |
| Battery backup1) | 3,65 V DC, 2 x AA lithium battery |
| Backup period | Up to 6 years (without maintenance), replaceable |
| Replacement interval | 10 years under normal operating conditions |
| Data logger (EEPROM) | 1400 hours, 460 days, 36 months, 20 years, 280 info codes (50 last ones readable on the display) |
| Clock / Calendar | Clock, calendar, leap year compensation, key date |
1) The use of data modules, frequent data communication and high ambient temperatures reduce battery life.
| Flow measurement | ULTRAFLOW® | Reed switch | 24 V active pulses |
|---|---|---|---|
| EN 1434 Pulse class | IC | IB | IA |
| Pulse input | 680 kΩ Pullup up to 3,6 V | 680 kΩ Pullup up to 3,6 V | 120 mA at 24 V |
| Pulse ON | 0,4 V in 1 ms | ‹ 0,4 V in › 300 ms | <4 V for > 3 ms |
| Pulse OFF | 2,5 V in 4 ms | › 2,5 V in › 100 ms | > 12 V for > 4 ms |
| Pulse frequency | ‹128 Hz | ‹ 1 Hz | ‹128 Hz |
| Electrical insulation | No | No | 2 kV |
| Maximum cable length | 10 m | 10 m | 100 m |
| Temperature sensor | Pt 500, 4-wire technology / glycol = Pt 500, 2-wire technology | ||
| Technical Data option cards | |
|---|---|
| Pulse inputs water meter | |
| Pulse input | 680 kΩ Pullup jusqu'à 3,6 V |
| Pulse ON | ‹ 0,4 V pour › 500 ms |
| Pulse OFF | › 2,5 V pour › 500 ms |
| Frequency | ‹ 1 Hz |
| Electrical insulation | Non |
| Maximum cable length | 25 m |
| Pulse outputs | |
| Pulse output type | Opto FET |
| External voltage | 1…48 V DC / V AC |
| Current | <50 mA |
| Residual voltage | Ron ≤ 40 Ω |
| Electrical insulation | 2 kV |
| Maximum cable length | 25 m |
Dimension diagram
