BTU Measurement System


isolviSOLV BTU Measurement System is used to measure individual energy consumption in any liquid heating/cooling systems. This system is also used to measure performance of energy saving system or the loss of efficiency which is directly tied to loss of revenue.

The iSOLV BTU Measurement System is supplied complete with electromagnetic flowmeter 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. It provides real time information such as instantaneous temperature, flow rate, energy consumption, and others.

Measuring Principle
iSOLV BTU meter calculates energy consumption by flow rate and temperature difference, the formula is:


Modes of Operation
When the water or other liquid passes through the pipe line, the flow meter measures the instantaneous flow rate and sends it to the iSOLV BTU meter then the temperature sensor measures the return pipe temperature and supply pipe temperature and also sends it to BTU meter.

According to above formula, iSOLV BTU meter integrates the cooling or heat consumption. If T1>T2, integrates cooling consumption, otherwise integrates heat consumption. Finally, the iSOLV BTU meter stores the data and displays on LCD.

  • Complies with OIML R75 and EN1434 standards.
  • Real time display of supply / return water temperature, instantaneous flow rate, cooling consumption value, heating consumption value, instantaneous power, total flow rate etc.
  • Four different units of measurements available: MJ, GJ, kWh/h, MWh/h.
  • Password protection available.
  • RS485 Communication protocol.
  • Matched pair of 3-wire Temperature sensor PT1000, for higher resolution and better accuracy.


Accuracy +/-  0.5%
Repeatability +/- 0.1%
Full Scale Range Setting 0.3 m/s to 15 m/s
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)
Model EFS 802
Process Connection
Size DN15-DN1000
Type Flange – DIN 2501/ ANSI/JIS
Pressure Rating Higher Pressure Rating Available On Request
Tube SS304
Liner (Wetted Parts) Hard Rubber (Std) / PTFE/ Others On Request
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
Temperature Range:
0 - 199.9 °C
Matched with Temperature Sensor:
Flow Rate Range:
(0 - 99999)m³/h
Cooling Consumption Accumulated Range:
(0 – 999999999)m³
Heating Consumption Accumulated Range:
(0 – 999999999)m³
Communication Interface:
Communication Rate:
300 - 38400 bps
214 mm x 164 mm x 71 mm
System Accuracy (Including flowmeter, temperature sensors):
< +/-2%

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