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Static compact hydronic meter with electronic measurement based on the ultrasonic principle, consisting of electronic energy calculator, ultrasonic...

Product Description

Honeywell EW773 Series ultrasonic meters are static compact heat or chilled water meters with electronic measurement based on the ultrasonic principle, consisting of an electronic energy calculator, an ultrasonic flow sensor and two temperature sensors.

They are used for metering of hydronic heating and/or cooling energy in hydronic systems based on volume, supply and return temperature. EW7730 models are suitable for energy metering in heating systems only. EW7731 models are suitable for energy metering in heating, cooling or combined systems.

Technical Properties

  • Heating: MID DE-10-MI004-PTB013, class 2
  • Cooling: DE-16-M-PTB-0001
  • Approved CE
Medium heating water
DN size 25 mm
Connection G 1 1/4
Maximum operating pressure 16 bar
Nominal flow (qp) 6 m3/h
Media temp. 5 ... 150 oC
Length 260 mm
Measuring process ultrasonic
Display functions LCD, 8-digit
Power source
  • Standard: 3.6V A-cell lithium battery (11 year lifetime)
  • Optional: 3.6V D-cell lithium battery (16 year lifetime), 230Vac or 24Vac mains unit
Interface M-Bus
Interface type Retrofittable (factory installed)
Dynamic range


  • Ultrasonic measuring principle
  • Dynamic range of 250:1 (qp:qi) in class 2
  • Detachable calculator unit with connection cable 1.5 m long and wall mounting plate for wall attachment
  • High battery Efficiency, A-cell: battery lifetime up to 11 years D-cell: battery lifetime up to 16 years
  • High long term stability, tested and verified by independent AGFW test
  • Insensitive to dirt
  • No moving parts in the flow
  • ZVEI optical interface
  • Optionally with integrated Radio OMS (Open Metering Standard), 868MHz
  • Remote reading with up to two add on plug and Play modules