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The VQ21 is an improved, poison-resistant combustible gas detector element designed for the detection of combustible gases, particularly methane in air mixtures from 0.1% upwards. It offers no interference from water vapour or carbon dioxide and is suitable for use in atmospheres where traces of silicone and other poisoning agents may be present. When used with the recommended bridge circuit and mounting arrangement, it achieves a minimum sensitivity of 10 mV/% methane. The VQ21 is designed for continuous operation and can detect methane concentrations up to 5% with a fast response time.
Product Attributes
Brand: SGX Sensortech
Model: VQ21
Element Type: Combustible Gas Detector
Detector Sleeve Color: Red
Compensator Sleeve Color: Black
Origin: Registered in England
Issue: A1A-VQ21 Issue 4, March 2007
Technical Specifications
Specification
Value
Notes
Operation
Continuous
May be under direct flow or diffusion conditions in appropriate mountings.
Bridge Supply
2.0 + 0.1 V
Bridge Power Consumption
0.75 W max
Typical Average Sensor Current
300 mA
Minimum Sensitivity
10 mV/% methane
With open-circuit conditions at the bridge output.
Linearity
Linear up to 5% methane
Response Time
2 seconds
To register 1 1/4% in a 2 1/2% concentration. Function of mounting type.
Maximum Methane Concentration
5 %
Calibration should be checked if exposed to >5% methane.
Mounting
See page 3
Outline
See page 3
Trimming Resistor (R)
Supplied where necessary
To be connected across the compensator element.
Resistance to Silicone Poisoning
Partly dependent on housing type
Results shown obtained using flow housing on page 3.
Changsha Purple Horn E-Commerce Co., Ltd.. is a professional company focus on integrated circuit ic business. Purple Horn will also responsible with exporting and logistic business. there is professional factory Beijing Silk Road which focus on desigining and manufacture.
Founded in 2009, Our compa... Changsha Purple Horn E-Commerce Co., Ltd.. is a professional company focus on integrated circuit ic business. Purple Horn will also responsible with exporting and logistic business. there is professional factory Beijing Silk Road which focus on desigining and manufacture.
Founded in 2009, Our compa...
