ERW 700

Flow computer for liquids, gases and steam

  • Calculation unit for heat metering (MID MI-004) and cold water metering (PTB); logger function
  • Calculates the energy, (standard) volume and mass from input variables (flow rate, pressure, etc.)
  • Input: 2 x 0/4…20 mA, 2 x pulse or frequency, 2 x Pt100/500/1000
  • Output: 2 x 0/4…20mA, 3 x pulse, MBus, Modbus (RS 232), etc.

ERW 700

Flow computer for liquids, gases and steam

  • Calculation unit for heat metering (MID MI-004) and cold water metering (PTB); logger function
  • Calculates the energy, (standard) volume and mass from input variables (flow rate, pressure, etc.)
  • Input: 2 x 0/4…20 mA, 2 x pulse or frequency, 2 x Pt100/500/1000
  • Output: 2 x 0/4…20mA, 3 x pulse, MBus, Modbus (RS 232), etc.

Overview

The ERW 700 is a flow computer for energy and flow rate calculation of gaseous, vaporous and liquid media. As a MI-004 approved calculation unit it can be used as part of a heat metering system in custody transfer applications. In addition, it is approved according to PTB for use in combination with a cooling meter. The flow computer calculates the (standard) volume, mass and energy of liquids, gases and steam from the input variables flow rate, (differential) pressure, temperature and density.

Product features and options depend on device configuration: Contact us to make sure that your preferred functionality can be combined in one device.

  • Billing counter for district heating and local heating
  • Numerous special functions such as for condensate/steam measurement, bidirectional measurement, heating/cooling switching, tariff or fault counters, etc.
  • Can be combined with all common volume flowmeters (ultrasonic, electromagnetic, Vortex, differential pressure, Coriolis)
  • High-precision calculations for density, enthalpy and compressibility
  • Calculation as per IAPWS-IF97 standard (water steam table)
  • Compensation input for density signal
  • Logger functions for set day, monthly values, period memory, error memory, parameter memory and MIN/MAX memory
  • Parameterization and operation via PC software and/or manually via display
  • Remote LCD housing available (for control cabinet installation)
  • Inputs and outputs modularly expandable: up to 6 x 4-20mA, 7 x digital, mbus, Modbus, Profibus
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