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The VQ21 is an improved poison-resistant sensor designed for the detection of combustible gases, particularly methane in air mixtures, from 0.1% concentration upwards. It offers no interference from water vapour or carbon dioxide and is suitable for atmospheres where traces of silicone and other poisoning agents may be present. When used with the recommended bridge circuit and mounting arrangement, it provides a minimum sensitivity of 10 mV/% methane. The sensor consists of two matched elements: a detector (red sleeve) and a compensator (black sleeve).
Product Attributes
Brand: SGX Sensortech(IS) Ltd
Product Type: Combustible Gas Detector Elements
Model: VQ21
Element Identification: Serial number on can (red for detector, black for compensator)
Detector Label: Red circular label on base
Origin: Registered in England No.08067077
Issue: A1A-VQ21 Issue 4, March 2007
Technical Specifications
Specification
Value
Notes
Operation
Continuous
1
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
2
Linearity
Linear up to 5% methane
Response Time (1 1/4% in 2 1/2% concentration)
2 seconds
2, 3
Maximum Methane Concentration
5 %
4
Trimming Resistor (R)
Supplied where necessary, connected across compensator element
5
Outline Dimensions (2310C)
Ref
Millimetres
A
11.05 + 0.25
B
6.10 + 0.25
C
3.56 + 0.13
D
63.50 min
E
1.02
F
7.37 + 0.51
G
8.20 max
H
9.53
J
1.52
Recommended Mounting Arrangements
Ref
Millimetres
AA
19.05 max
AB
9.53 + 0.13
AC
8.33 + 0.13
AD
8.20 min
AE
19.05 max
AF
9.53 + 0.13
AG
8.20 min
Notes
Operation may be under either direct flow or diffusion conditions in appropriate mountings.
With open-circuit conditions at the bridge output.
The response time is a function of the type of mounting used.
If the VQ21 is exposed to greater than 5% methane concentration, the calibration of the instrument should be checked.
The elements are supplied as a matched pair with a trimming resistor R of the correct value which is supplied where necessary. The trimming resistor is to be connected across the compensator element.
The resistance to poisoning by silicone compounds is partly dependent upon the type of housing within which the elements are mounted.
The response to certain of the heavy flammable vapours, especially aromatic substances with side chains, may be lower than that calculated from the conversion (K) factors listed in the preamble.
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...
