About Pressure Switches
Trafag’s electromechanical pressure switches, also known as pressostats, which can be operated maintenance-free for decades, even under harsh conditions.

Various versions with bellows, diaphragm and piston sensors cover a wide range of pressure ranges, media and load profiles for the most diverse applications.
Description of Trafag 901/902/906 Limi Membrane Pressostat
A dependable pressure switch with a high degree of accuracy, the Trafag 901/902/906 Limi Membrane Pressostat is made especially for low to medium pressure monitoring applications. This product’s membrane-based sensing element makes it appropriate for use in severe environments, such as those involving corrosive liquids or gases. It is the perfect option for heavy industries and manufacturing operations due to its robust structure and small size.
Main Features of Trafag 901/902/906 Limi Membrane Pressostat
- Rugged aluminium housing
- Protection IP 65
- Diverse mounting positions
Application of Trafag 901/902/906 Limi Membrane Pressostat
- Chemical Industry: Regulating pressure in corrosive liquid and gas pipe systems or reactors.
- Pressure monitoring in filtration or distribution systems is done in the water treatment industry.
- HVAC: Makes sure that heating and cooling systems have steady pressure regulation.
- Applications of pressure measurement in hygienic manufacturing processes in the food and beverage industry.
- Renewable Energy: Utilized in hydrogen or biogas power plants.
- For applications requiring low to medium pressure, pneumatic and hydraulic systems are used to regulate pressure.
Technical Data of Trafag 901/902/906
Product code | 901/902/906 |
Designation | Limi Membrane Pressostat |
Product category | Mechanical pressure switches |
Measuring principle | Membrane |
Applications | HVAC Machine tools |
Approval / conformity | EN60730-1/ EN60730-2-6: Typ 2.B.H |
Repeatability | ± 1.0 % FS typ. |
Output signal | 1 Floating change-over contact (SPDT) |
Electrical connections | Screw terminal |
Pressure connections | G1/4″ f, G1/2″ m |
Media temperature | -40°C … +150°C |
Ambient temperature | -25°C … +70°C |
Source: trafag.com
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