The DN-EM is an economical energy flow monitor intended for applications in energy transfer and heating/ cooling systems where energy use requires measurement. Energy Monitoring of Heating or Cooling Systems, 1/2” & 3/4” Pipe.
Description:
The DN-EM internally calculates the energy passing through the system. The energy used is calculated based on the the mass volume of liquid passing through the system and the difference in temperature between the supply and return lines. The volume of liquid is measured by means of a pulse generating Clark vortex flow transmitter. A RTD sensor built into the flowmeter (T1) measures temperature at the meter and the remote temperature (T2) is measured by means of a precision RTD sensor mounted in a pipe tee.
A scaled pulse output is provided and can be configured to report volume flow rate, mass flow rate or energy total. Modbus 485 communications provides an interface with a building automation or monitoring system.
The unit contains non-volatile memory that records flow and energy, and is updated every ten minutes. However, when flow, mass or energy totals are read, the reported values are true current values; the last stored value is added to the current accumulated value when the applicable register is read.
The default medium for the DN-EM is water. Other media consisting of water and a certain percentage of glycol up to 30% can be field configured.
APPLICATIONS:
HEATING & COOLING LOOPS
HEAT RECOVERY APPLICATIONS
CONDENSATE RECOVERY APPLICATIONS
EFFICIENCY MEASURING/VERIFICATION
SOLAR AND GEOTHERMAL SYSTEMS
Clark Sonic Energy Flowmeter Literature 
