• Heimann Sensor GmbH
• Amphenol Corporation
• smartGAS Mikrosensorik GmbH
• Alphasense Ltd (Ametek Inc.)
• ABB Group
• Senseair AB(Asahi Kasei Corporation)
• Process Sensing Technologies
• Honeywell International Inc.
• Dragerwerk AG & Co. KGaA
• Figaro Engineering Inc. (New Cosmos Electric Co. Ltd.)