Model CM6G Gas Calorimeter is used to measure and control the calorific value or Wobbe Index (WI) of the sample gas. In this calorimeter the sample gas is burnt at the burner with air and the temperature difference between the combustion exhaust gas and the feed air at the burner inlet is detected by using a thermocouple.

This calorimeter detects the flow rate of both the sample gas and the air as the differential pressure by using the orifice and converts the differential pressure to the digital signal then compensates the flow rate variation by the digital calculation. This method gives an excellent high reliability, therefore it can be used for the control of thermal input for the various type furnaces in the steel mill and petrochemical industries, also for the calorie control of the town gas.

* This product is not available in Europe.

 General Specification for CM6G 

 User's Manual for CM6G 

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The construction of the detector is solid and durable, and easy for maintenance and operation.

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Special patent construction is adopted at the mixing point of the heat exhaust gas and the heat absorbing air from the detector, and it improves the response time.

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Excellent high reliability by using orifices to detect differential pressure both air and gas and to calculate after compensating the indication errors caused by the flow rate variations.

Town Gas Application

Purpose

Measurement and control of the calorific value of town gas.

Measurement

WI or calorific value of fuel gas.

Measuring Range

3 to 62 MJ/Nm³

Conditions at the Sampling Point

Range

Select scale range (Span):
General Gas: 30 to 50% of maximum value of the span.
Butane or Butene + Air:20 to 30% of maximum value of the span.
Propane or Propylene + Air: 25 to 40% of maximum value of the span.

Output

1 to 5 V DC, 4 to 20 mA DC (simultaneously), non-isolated, load resistance 750Ω or less

Alarm Contact Output

Flame off alarm; 100 V AC, 5 A, closed when alarm occurs (resistance load)
Temperature alarm; 100 V AC, 3 A, closed when alarm occurs (resistance load)

Contact Input

Remote ignition (Tokuchu); 24 V DC, 0.1A or more

Sample Gas Flow Rate

Approx. 10 l/min

Utility

Instrument Air: Approx. 50 Nl/min, pressure 300 to 700 kPa, dew point of 0℃ or less
Power Supply: 100 V AC ±10%, single phase, 50/60 Hz, 860 VA max.

Panel

Construction: For indoor installation, rack panel.

Ambient Temperature

0 to 40℃ (Little temperature variation, particularly no rapid change in temperature, allowed)

Repeatability

When the calorific value means 6.3 MJ/Nm³ or higher,
Calorific : ±1.0% of measured value
WI : ±0.5% of measured value

Steel Mill Application

Purpose

Measurement and control of the calorific value of fuel gas for a steel mill.

Measurement

WI or calorific value of fuel gas.

Measuring Range

3 to 62 MJ/Nm³

Conditions at the Sampling Point

Range

Select scale range (Span):
General Gas: 30 to 50% of maximum value of the span.
Butane or Butene + Air:20 to 30% of maximum value of the span.
Propane or Propylene + Air: 25 to 40% of maximum value of the span.

Output

1 to 5 V DC, 4 to 20 mA DC (simultaneously), non-isolated, load resistance 750Ω or less

Alarm Contact Output

Flame off alarm; 100 V AC, 5 A, closed when alarm occurs (resistance load)
Temperature alarm; 100 V AC, 3 A, closed when alarm occurs (resistance load)

Contact Input

Remote ignition (Tokuchu); 24 V DC, 0.1A or more

Sample Gas Flow Rate

Approx. 10 l/min

Utility

Water: Approx. 0.2 l/min, pressure 200 to 600 kPa
Instrument Air: Approx. 50 Nl/min, pressure 300 to 700 kPa, dew point of 0℃ or less
Power Supply: 100 V AC ±10%, single phase, 50/60 Hz, 1100 VA max.

Panel

Construction: For indoor installation, rack panel.

Ambient Temperature

0 to 40℃ (Little temperature variation, particularly no rapid change in temperature, allowed)

Repeatability

When the calorific value means 6.3 MJ/Nm³ or higher,
Calorific : ±1.0% of measured value
WI : ±0.5% of measured value