Data Sheet for Product

2
Building Technologies
CE2N5323_en--_b
2018-01-23
Use
The impeller type heat and cooling energy meter is of compact design and used for the
physically accurate acquisition of energy consumption.
The meter consists of a flow measuring section, 2 ready connected temperature sensors,
and an electronic unit which calculates energy consumption from the flow and the
temperature differential. The device is available for heat, combined heat/cooling, or solar
metering.
It is primarily used on plants with central production of heat or cooling energy, where the
heating or cooling energy is individually supplied in lines to multiple consumers, for example
in:
● Multi-family homes
● Office and administrative buildings
Typical users:
● Service and billing providers
● Housing industry and housing cooperatives
● Building service companies and real estate agencies
Restrictions
The meter's temperature sensors and battery cannot be replaced.
The meter is not approved for use in drinking water systems.
RF sets
Available RF heating and RF heating/cooling meter sets are available in data
sheet A6V11259309.
The data sheet can be downloaded at
http://siemens.com/bt/download.
Functions
Meter design
The meter comprises a flow and return temperature sensor and flow sensor installed in a hot
water or cooling water circuit. A processor continuously calculates the temperature
differential of flow and return and multiplies the value by the flow rate. The result (the current
heat or cooling energy output) is added up, displayed, and forwarded via radio or cable to a
data processing system using an optional add-on module. A long-life battery powers the
processor for up to 10 years.
Impeller type measuring principle
The meter's flow sensor operates in accordance wit the single-jet impeller sensor principle.
The water flow hits the impeller radially. The impeller's speed is scanned electronically.
Incorrect direction of flow is detected and indicated by an error message on the display.
Calculation of heat or cooling energy consumption
Using the acquired temperature differential of flow and return, the measured flow rate as well
as the calculated thermal coefficient, the quantity of heat or cooling energy is shown on the
display in physical units (kWh or MWh/MJ or GJ) following an internal calculation process.
To increase measuring accuracy, the density and enthalpy values are determined for every
measurement and included in the calculation.