Honeywell Home 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 Home 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. For remote readout the EW500 offers a variety of retrofittable interface modules, including M-Bus and Modbus. The calculators standard configuration can be modified by using a PC software and connecting over the ZVEI standard optical interface on the front of the device with optical interface EWA3001798. A separate permission level is available for user and legalisation access to avoid unauthorised tampering with approval relevant configuration items. Temperature sensors are not supplied with the calculator and have to be ordered separately. Standard configuration is prepared for 2-wire Pt500 temperature sensors. A model is available for 4-wire Pt100 temperature sensors. The housing is closed with two sealable screws. It has protection class IP54 as standard. EW500 energy calculators are supplied with a backplate for mounting to a wall.
LCD, 8+4-digit with symbols
||Battery with 11 year nominal lifetime
- Suitable for ultrasonic and mechanical flow sensors
- Up to two field retrofittable communications modules, including M-Bus and Modbus
- Four additional configurable pulse inputs•Versatile power supply
IP54 (standard) IP65 or IP68 on request
- Measurement and display of current data
- Calculation and display of average data for period, set in the range of 1 minute to 24 hours
- Setting, archiving and display of up to two independent tariffs
- Calculation, archiving and display of measured data in five groups with configurable time cycles
- 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 timestamp
- Device parametrisation with PC software or, with limitations, by using push buttons on front of calculator housing