• Energy Calculators

Energy Calculators

• Suitable for ultrasonic and mechanical flow sensors
• Up to two field retrofittable communications modules,including M-Bus and
• Four additional configurable pulse inputs
• Versatile power supply
Model : EW500 Series

Honeywell EW500 energy calculators are used for energy
consumption metering in hydronic heating and cooling
systems. They are typically combined with a pair of
temperature sensors and a mechanical or ultrasonic flow sensor, for example Honeywell EW370 or EW480 Series, to provide the full functionality of a heat meter.
EW500 energy calculators are suitable for energy metering
of heating energy, cooling energy or heating and cooling
energy transported in one pipeline. The switch between
heating and cooling register happens automatically when
the ∆t turns negative and the supply temperature falls below the programmed threshold.
Metered values, error logs and configuration changes are
stored in a non volatile memory. The calculator can be read out over the display or remotely. For local readout the meter is equipped with a multiple line 8+4 digit LCD display.
• Measurement and display of current data.
• Calculation and display of average data for period, set in
the range of 1 minute to 24 hours.
• Calculation, archiving and display of measured data in
five groups with configurable time cycles.
• Setting, archiving and display of up to two independent

• Setting, archiving and display of accounting data.

 Error log (last 83 records) and occurrence log (last 256
records) with timestamp.
• Configuration change log (last 83 records) and
metrological change log (last 62 records) with
• Device parametrisation with PC software or, with
limitations, by using push buttons on front of calculator

District heating applications

Chilled water applications

Combined cooling/heating applications