Energy Measurement

BTU Measurement System

EFS802 All-in-One Energy Measurement System

efs802 btu energy measurement system

The iSOLV EFS802 BTU Measurement System is supplied complete with electromagnetic flow meter and temperature probes. The system real-time detects the temperature of supply and return pipe. It also monitors the instantaneous flow rate according to Heat Exchange of Thermodynamics principle. The iSOLV BTU meter automatically integrates energy consumption and transfers it to the computer. The consumption volume can be checked by a tenant or operator with no worries. EFS802 BTU Measurement System provides real time information such as instantaneous temperature, flow rate, energy consumption, and others. Flow meter is reduced bore type which enables U0D0 straight pipe length installation. 

  • EFS802 BTU Measurement System is OIMLR75 and EN1434 compliant
  • Supplied complete with flow meter and temperature probes
  • Reduced bore flow meter with U0D0 (straight pipe length) installation
  • Matched pair of 3-wire Temperature sensor PT1000, for higher resolution and better accuracy
  • Temperature sensor comes with thermowell and socket weld for easy installation
  • Real time display of supply / return water temperature, instantaneous flow rate, cooling consumption value, heating consumption value, instantaneous power, total flow rate etc.
  • Measurement units: MJ, GJ, kWh/h, MWh/h
  • Password protected
  • RS485 Communication protocol
EFS802 BTU Measurement System is used in the following applications:
  • AHU (Air Handling Unit)
  • FCU (Fan Cooling Unit)


Accuracy +/- 0.5%
Repeatability +/- 0.1%
Full Scale Range Setting 0.1m/s to 10m/s (≤ DN300)
0.3 m/s to 15 m/s (> DN300)
Fluid Conductivity  > 5μS/cm
Fluid Temperature -25°C to 90°C
Ambient Temperature -40°C to 65°C
Calibration Certificate Wet Calibration – 3 Points (Additional Test Points Upon Request)

Flow Sensor

Model EFS 802
Process Connection  
Size DN25-DN1000 ( other sizes upon request)
Type Flange – DIN 2501/ ANSI/JIS
Pressure Rating Refer To Page 8. Higher Pressure Rating Available On Request
Tube Carbon Steel (≤ DN300)
SS304 (> DN300)
Liner (Wetted Parts) Fluororubber (FPM) (≤ DN300)
Hard Rubber (Std) / PTFE/ Others On Request (> DN300)
Signal Electrode (Wetted Parts) SS316 (Std)/ Hastelloy C/ Tantalum/ Titanium
Process – Flange Carbon Steel (Std)/ SS304 (Optional With Price Adder)
Housing Steel With Epoxy Paint
Grounding Rings (Optional) SS304 / SS316
Flow Direction Bi-directional (Forward / Reverse)
Protection Class IP 68


Model RFT202
Operating Voltage 85 – 250 VAC, 45 – 63Hz / 24 VDC
Temperature Range 0 – 199.9 °C
Flow Rate Range (0 – 99999)m³/h
Cooling Consumption Accumulated Range (0 – 999999999)m³
Heating Consumption Accumulated Range (0 – 999999999)m³
Communication Interface RS-485
Communication Rate 300 – 38400 bps
Dimension 214 mm x 164 mm x 71 mm
System Accuracy (Including flow meter, temperature sensors) < +/-2%

Temperature Sensor (PT1000)

Accuracy Class A
Type 3-Wire RTD Sensor
Wire Length 10 Meters
Wire Gauge 24 AWG
Accessories Comes complete with Socket Weld + Thermowell