The Kamstrup MULTICAL 403 Meter delivers dependable, high-precision thermal energy calculation, continuous ultrasonic flow measurement, and flexible communication telemetry engineered specifically for commercial HVAC systems, district heating and cooling networks, and multi-tenant sub-metering infrastructures.

Precision Hydronic Energy Billing with the Kamstrup MULTICAL 403 Meter

Operating as a versatile static thermal energy meter, the Kamstrup MULTICAL 403 Meter measures heating, cooling, or bi-functional heating/cooling energy throughput based on ultrasonic volumetric transit-time differential calculation and matched temperature sensing. Because the meter utilizes static acoustic sensors without impellers or moving mechanical parts, it prevents mechanical wear, maintains calibration stability across decades of operation, and eliminates hydraulic pressure loss across primary hydronic circuits.

The instrument provides complete configuration flexibility directly on-site. Field technicians can configure flow sensor pulse settings, inlet/outlet sensor positioning, and energy display units directly through the front-panel optical interface or programming pushbuttons without requiring proprietary factory tools. Paired with matched Pt100 or Pt500 precision platinum resistance temperature sensors, the calculator accurately acquires micro-Kelvin thermal differentials to guarantee reliable metering even during low-delta-T conditions.

Engineered for seamless integration into modern automated meter reading (AMR) and Building Management Systems (BMS), the unit features a modular communication bay. It supports field-swappable communication modules—including wired M-Bus, Wireless M-Bus, Modbus RTU, BACnet MS/TP, and analog pulse outputs—enabling real-time supervisory data logging and dispute-free tenant utility allocation.

Key Features and Engineering Advantages

• Wear-Free Ultrasonic Flow Measurement: Uses acoustic transit-time technology without moving parts, eliminating clogging risks, mechanical wear, and pressure degradation.
• On-Site Reconfiguration Flexibility: Field-programmable parameters allow adjustment of installation position (flow or return pipe) and engineering units without breaking metrological seals.
• Modular Communication Options: Plug-and-play module slot supports M-Bus, Wireless M-Bus, BACnet MS/TP, Modbus RTU, and dual pulse outputs.
• EN 1434 Metrological Approval: Certified to MID Class 2 and EN 1434 standards for high-precision, legally compliant tenant energy billing and tariff settlement.
• High-Capacity Flash Data Logging: Internal non-volatile memory logs detailed historical consumption trends across hourly, daily, monthly, and yearly intervals.

Technical Specifications

Industrial Applications and Process Integration

The Kamstrup MULTICAL 403 Meter is deployed across commercial, utility, and municipal hydronic networks, including:

• District cooling substations, central chilled water coils, and primary heat exchangers.
• Centralized boiler plants, hydronic heating loops, and radiant floor distribution manifolds.
• Multi-tenant commercial office buildings, shopping malls, and residential complexes requiring sub-metered HVAC allocation.
• Industrial heat recovery loops, cooling tower thermal efficiency verification, and process water metering.

Frequently Asked Questions

What is the difference between the Kamstrup MULTICAL 403 and the MULTICAL 603?
The Kamstrup MULTICAL 403 Meter is an all-in-one compact meter with an integrated flow sensor designed primarily for flow sizes up to 15 m³/h (DN50) and featuring a single communication module slot. The MULTICAL 603 is a modular standalone calculator engineered to pair with separate external ULTRAFLOW flow sensors up to 10,000 m³/h and houses two independent communication module slots simultaneously.

Can the meter’s pipe installation orientation be adjusted on-site?
Yes. One of the primary engineering advantages of the MULTICAL 403 is that the installation position (inlet flow pipe or outlet return pipe) and engineering display units can be adjusted directly in the field using the front pushbuttons before the meter is placed into operation.

Does the meter support simultaneous heating and cooling energy recording?
Yes. When ordered as a combined heating/cooling meter, the instrument automatically detects flow direction and thermal differential signs relative to a programmable split temperature, recording heating energy and cooling energy into separate, dedicated billing registers.