Infrared sensor designed for detection of refrigerant gases

12th April 2018
Source: 3M
Posted By : Lanna Deamer
Infrared sensor designed for detection of refrigerant gases


Oldham, a company within the 3M Group, Personal Safety Division has announced the launch of a new infrared sensor for detection of refrigerant gases and SF6. The OLCT 100 is a 4-20mA analogue gas transmitter designed for industrial applications in hazardous locations.

The applications for this new sensor are numerous and the markets for its use are global: Cooling industry (refrigeration and air-conditioning), food industry, high and medium voltage switch protection, automotive industry, etc. 

The new infrared sensor will provide a real advantage in terms of HFO fluid detection (hydro-fluoro-olefins) that are found in many applications, since it replaces the HFC (hydro-fluoro-carbons) that were formally used. 

Although other technologies are reliable to detect HFO, it still requires a lot of maintenance. As it is necessary to test the detector after each gas exposure to check that it is functioning properly (for catalytic sensors).

Furthermore, experience shows that it is impossible to prevent leaks from these machines, as there is often fifty ppm of HFO inside the filling machine housings, and that is close to the detectors. In these conditions, the detectors should be tested every day, which is a lot of maintenance and headaches for the production line operators.

Thanks to the infrared technology, this problem has been solved. The operating principle is based on the reduction of infrared radiation when gas is present. There is no chemical reaction or modification to the structure of the HFO molecule. The sensor is not damaged by the continuous presence of gas or over-exposures of gas.

The advantages are multiple:

  • Reduced maintenance
  • MTBF (Mean Time Before Failure) is five years
  • No interference from CO2, C1 to C5 alkanes (methane, ethane, propane, butane, pentane) or from NH3
  • Very stable even in case of variations in humidity level or temperature


You must be logged in to comment

Write a comment

No comments

Sign up to view our publications

Sign up

Sign up to view our downloads

Sign up

17th May 2022
Czech Republic Brno Exhibition Centre
ARC's European Industry Forum 2022
17th May 2022
United Kingdom Online
Space Tech Expo USA 2022
23rd May 2022
United States of America Long Beach
2nd Annual - APAC Data 2030 Summit
25th May 2022
Singapore Online USA 2022
6th June 2022
United States of America Delta Hotels by Marriott