Kamstrup MULTICAL 603 Heat and Cooling Energy Calculator

Overview

The Kamstrup MULTICAL 603 is a general-purpose energy calculator that works as a heat meter, cooling meter or combined heat/cooling meter together with one or two flow sensors and two or three temperature sensors. Under EN 1434 and the MID it is a calculator with its own type approval, so it can be supplied on its own for connection to an existing flow meter, or as a complete meter with Kamstrup ULTRAFLOW flow sensor and matched temperature sensors. Beyond billing, it can be used for leak monitoring, permanent performance monitoring, power and flow limiting with valve control, and energy measurement in open and closed systems.

Seven Star LLC supplies the Kamstrup MULTICAL 603 to district cooling providers, MEP contractors, hospitals, campuses and industrial plants in Oman and the GCC, with engineering support in Muscat. Where a compact meter is too small, for example on a building connection to a district cooling main, this calculator provides the input flexibility and communication options that energy transfer stations need.

Measurement Principle

The Kamstrup MULTICAL 603 integrates thermal energy from the volume flow and the temperature difference between supply (t1) and return (t2). Volume arrives as pulses from the flow sensor on input V1, with a second input V2 available for a second flow sensor; the pulse figure is programmable from 0.001 to 300 pulses per litre and the nominal flow from 0.6 to 15,000 m³/h. Temperatures come from Pt100 or Pt500 sensors to EN 60751, in 2-wire or 4-wire connection. The approved range is 2 to 180 °C with a temperature difference of 3 to 178 K, and the meter measures down to 0.01 K without a low-temperature cut-off.

Kamstrup quotes a typical calculator accuracy of ±(0.15 + 2/ΔΘ) %, well inside the EN 1434-1 limit of ±(0.5 + ΔΘmin/ΔΘ) %. When the Kamstrup MULTICAL 603 is combined with an ULTRAFLOW X4 sensor, Auto Detect matches the pulse figure and qp automatically, so a flow sensor can be exchanged without reconfiguring the calculator.

Engineering Design of the Kamstrup MULTICAL 603

The Kamstrup MULTICAL 603 calculator weighs 450 g, is rated IP65 and is designed for indoor installation at 5 to 55 °C in a non-condensing location. It can be mounted directly on the flow sensor or on a wall bracket; for media below ambient temperature, which is the normal case in chilled water, Kamstrup recommends wall-mounting. Nine calculator types cover the combinations of Pt100 or Pt500, 2-wire or 4-wire, one or two flow inputs, a third temperature input t3, 24 V active pulse inputs (type 603-G) and a backlit display (type 603-F). Type 603-M is a mixed fluid version that calculates energy from -40 to 140 °C for glycol systems under EN 1434, without MID approval.

Power comes from a D-cell lithium battery with up to 16 years’ life when wall-mounted, a 2 x A-cell pack, a D-cell IoT battery, or 230 VAC or 24 VAC/VDC supply modules with a supercap backup against short interruptions. Two module slots in the Kamstrup MULTICAL 603 accept a wide range of communication and I/O modules. The Kamstrup MULTICAL 603 can be reconfigured after installation through the front keys, READy or METERTOOL HCW.

Key Features

The Kamstrup MULTICAL 603 is built for plant-room energy metering where flexibility matters:

• Configurable as heat meter, cooling meter, bifunctional heat/cooling meter, volume meter or energy meter.
• Two flow inputs for ULTRAFLOW sensors or third-party flow meters with reed, FET, electronic or 24 V active pulses.
• Pt100 or Pt500 temperature inputs, with 4-wire sensor cables up to 100 m.
• Two-second integration interval and a minute-resolution data logger with programmable registers.
• Seven- or eight-digit display in kWh, MWh, GJ or Gcal, with an optional backlit version.
• Two module slots for M-Bus, Wireless M-Bus, linkIQ, Modbus RTU/TCP, BACnet MS/TP/IP, LON, 2G/4G, NB-IoT, analog outputs and analog inputs.
• PQT Controller module for power and flow limiting through valve control.
• Info logger storing 250 info codes, with the latest 50 visible in the display.

Industrial Applications

District cooling is the defining use of the Kamstrup MULTICAL 603 in the Gulf. At each building energy transfer station, the calculator takes pulses from a large ultrasonic or electromagnetic flow meter on the primary side, reads a pair of 4-wire Pt500 pocket sensors, and reports cooling energy to the billing system while a second module feeds the building BMS over BACnet or Modbus. The same arrangement serves chiller plants in hospitals, universities, airports and government complexes in Muscat, where the operator needs to verify plant output against electrical input.

Industrial users in the Sohar, Duqm and Salalah zones apply the calculator to process cooling loops, heat recovery systems and glycol circuits, using analog inputs to bring pressure or other signals into the same data logger. Seven Star LLC supplies the Kamstrup MULTICAL 603 with the right calculator type, sensors and modules for each site, and provides the Kamstrup data sheet for consultant approval.

For apartment and tenant sub-metering, see the Kamstrup MULTICAL 403 heat and cooling meter.

Technical Specifications

The following data for the Kamstrup MULTICAL 603 is taken from the Kamstrup data sheet FILE100000683 (edition 08.2024):

How to Order

To request a quotation for the Kamstrup MULTICAL 603, send Seven Star LLC the service (heat, cooling or both), flow meter type and pulse output, pipe size, temperature sensor arrangement, supply voltage and the protocols needed for billing and BMS. Our Muscat team will confirm the calculator type and modules, advise on stock and delivery for Oman and the GCC, and provide the official data sheet. Related products on our site include the pFlow D116-BTU wall-mounted ultrasonic BTU meter, the pFlow E8 ultrasonic BTU energy meter and the Dynasonics UHC-120 thermal energy meter.