Combustible Gas Detector Elements Featuring Amphenol VQ25B for Detection in Industrial Applications

Product Overview

The VQ25 Combustible Gas Detector Elements are designed for the detection of combustible gases in air, offering robust performance even in high concentration environments (up to 100%). These matched elements are particularly suitable for applications where exposure to flammable gases is likely. The VQ25 is also effective for detecting combustible vapors containing halogens and is generally unaffected by water vapor or carbon dioxide unless their concentrations impact flammability. With a recommended bridge circuit, the VQ25 provides a minimum sensitivity of 25 mV/1% n-butane.

Product Attributes

• Brand: SGX Sensortech(IS) Ltd.
• Product Type: Combustible Gas Detector Elements
• Model Series: VQ25
• Marking: Serial number in red on detector, black on compensator. Red circular label on detector base.
• Sleeve Color: Black (Compensator), Red (Detector)

Technical Specifications

Specification	Value	Notes
Element Type	Matched Pair	Used for combustible gas detection in air. Not generally suitable for methane.
Bridge Supply Voltage	2.0 + 0.1 V	Continuous operation.
Bridge Power Consumption	0.75 W max
Minimum Sensitivity	25 mV/1% n-butane	With recommended bridge circuit.
Linearity	Linear up to 1.5% n-butane
Response Time	3 seconds	To register 0.5% in a 1% concentration. Dependent on mounting type.
Trimming Resistor (R)	39 to 120	Supplied with elements, connected across compensator.
Outline Dimensions (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	Nominal dimensions without limits. No bends in length J.
Mounting Arrangement	See page 3	Can be under direct flow or diffusion conditions.
Recommended Mounting Dimensions (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
Filter Paper & Gauze	60 mesh stainless steel gauze	Used in mounting arrangements.

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Combustible Gas Detector Elements Featuring Amphenol VQ25B for Detection in Industrial Applications Images