Product Overview

The CGS500 Thermocatalytic Gas Sensor is designed to measure combustible gas concentrations in the range 0-100% LEL. It is housed in a rugged stainless steel body and operates using two thermocatalytic elements: an active element where combustible gases oxidise, and a reference element that compensates for changes in temperature and pressure. The use of a catalyst prolongs the life of the elements and results in low power consumption. The sensor is certified ATEX II 2G EEx d IIC T6 and can be provided as a sensor only or fitted in an EEx e certified junction box.

Key Features

• Certified ATEX II 2G EEx d IIC T6.
• Rugged stainless steel body.
• Temperature compensated.
• Low drift.
• Available with improved poison resistance (CGS500-300P).
• Long life (typically 3 to 5 years).
• Fast response time (T90 is less than 30 seconds).

Applications

• Detects combustible gases and solvents.
• Suitable for hazardous areas like refineries and chemical processing.
• The CGS500-VQ41 variant is optimised for monitoring ammonia and kerosene.

Technical Specifications

Specification	Value
ATEX Certification	II 2 G EExd IIC T6 (Certificate No. BAS00ATEX2246X)
Detection Range	0-100% LEL
Operating Voltage & Current	2.05Vdc +/- 0.05Vdc @ 300mA
Operating Temperature Range	-20 degrees C to +40 degrees C
Repeatability	+/- 3% LEL CH4 at 20 degrees C
Zero Drift	+/- 2% LEL CH4 per month at 20 degrees C
Typical Sensor Life	3 to 5 years
Mounting Thread	M25 X 1.5mm
Junction Box Size (Excl. Sensor)	W: 75mm, D: 58mm, H: 80mm