- ABB Instrumentation
- All Sensors Corporation
- Bosch Sensortec GmbH
- Endress+Hauser AG
- GE Measurement & Control
- Honeywell Sensing and Productivity Solutions
- Invensys Ltd
- Kistler Group
- Rockwell Automation Inc.
- Rosemount Inc. (Emerson Electric Company)
- Sensata Technologies Inc.
- Siemens Building Technologies AG (Siemens AG)
- Yokogawa Corporation