Product Overview

The VQ6 Series Thermal Conductivity Gas Detector Elements are designed for detecting gases in 0 100% by volume concentrations. Utilizing the thermal conductivity principle, these elements feature a sensing element exposed to the atmosphere under test and a reference element sealed in reference air. The response is based on the difference in thermal conductivity between the test atmosphere and the reference air, leading to a change in resistance of the sensing element. The VQ6M and VQ6MB models are available, with the VQ6MB offering extended pins for direct PCB fitting. These sensors are suitable for continuous operation in various mounting arrangements, including direct flow or diffusion conditions.

Product Attributes

• Brand: SGX Sensortech
• Series: VQ6
• Element Identification: Serial number in red (sensing element), black (reference element). Red circular label on sensing element base.

Technical Specifications

Specification	Details
Models	VQ6, VQ6B, VQ6M, VQ6MB
Detection Range	0 100% by volume
Operating Principle	Thermal Conductivity
Operation Mode	Continuous
Recommended Bridge Supply	2.0 0.1 V
Bridge Power Consumption	0.75 W max
Typical Response to Methane in Air	1.0 mV/% methane (open-circuit conditions at bridge output)
Response Time	Dependent on mounting type
Shock Test	250 g, 5 blows in each plane
Vibration Test	20 g, 24 cycles from 100 to 3200 Hz
VQ6M/VQ6B Compensator Can	Sealed (requires mounting in a sealed chamber with air or nitrogen)
VQ6/VQ6B Compensator Can	Open (requires mounting in a sealed chamber with air or nitrogen)
VQ6M Outline Dimensions (Nominal)	A: 11.05 0.25 mm, B: 6.10 0.25 mm, C: 3.56 0.13 mm, D: 63.5 mm min, E: 1.0 mm, F: * (sensing element 6.25 0.50 mm, reference element 7.75 0.38 mm), G: 8.2 mm max, H: 9.53 mm, J: 1.5 mm
VQ6MB Outline Dimensions (Nominal)	A: 11.05 0.25 mm, B: 6.10 0.25 mm, C: 3.56 0.13 mm, D: 40.0 mm min, E: 1.0 mm, F: * (sensing element 6.25 0.50 mm, reference element 7.75 0.38 mm), G: 8.2 mm max, H: 1.5 mm
Recommended Mounting Arrangement Dimensions (Nominal)	AA: 9.53 0.13 mm, AB: 8.33 0.13 mm, AC: 8.20 mm min, AD: 9.53 0.13 mm, AE: 8.20 mm min
Thermal Conductivity of Gases (Relative to Air)	See table in source document for values at various temperatures (0C to 600C) for Nitrogen, Oxygen, Argon, Carbon dioxide, Water vapour, Methane, Ethane, Propane, Carbon monoxide, Ethylene, Acetylene, Hydrogen, Helium, Ammonia.