EngyCal RH33

Custody transfer BTU meter for recording heat quantities of water

General Information
Input / Output
Electrical Data
Mechanical Data
Certification / Approvals
Additional Information


  • For heat quantity and heat quantity difference on heating/cooling circuits
  • Inputs: 1x Pulse/current, 2x RTD/current,
  • Output: 1x current, 2x open collector, 2x relay
  • Alarms: Colour change in case of alarm event on Display
  • Configuration: Local buttons, USB interface and optionally Ethernet for configuration
  • Communication protocol: USB interface, Ethernet TCP/IP, RS485, Modbus TCP, Modbus RTU, M-Bus
  • Custody transfer approval and allows bi-directional measurement

Fields of application

  • Recording and billing the quantities of heat and cold in: Heating circuits, Cooling circuits, Combined heating and cooling circuits
  • Typical application areas in industry, long-distance heat networks and building automation


The BTU meter RH33 is used in applications with liquid energy carriers. It calculates the thermal energy of water acc. to EN1434, glycol/water mixtures or other fluids such as thermal oils. Temperature sensor matching using calibrated temperature sensors is done in the device. Potential for cost savings can be shown by using the software available as an accessory. The device has a custody transfer approval and allows bi-directional measurement, e.g. charging/discharging of a heat accumulator.

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Somya Gupta

The conversation was highly helpful to me. I want to know about the suitable sensors that can be used for level measurements for conical tank systems. Mr. Pedro has quickly responded and explained in very ease way. It was nice interacting with him.

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EngyCal RH33
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Ohannes Markarian

A great company that provided a wide range of products from various suppliers. Support is excellent and very responsive

Product Details