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 PST4M 9M4 Picostat Pressure Switch
The 9M4 of the Picostat series is based on our long lasting experience in the shipbuilding and railway sector. This further improved version offers high vibration resistance within a compact body and is suitable for a wide temperature range. The Trafag PST4M 9M4 Picostat is a high-quality pressure switch that is designed to control pressure in a variety of industrial applications. It is reliable on detecting and controlling pressure in fluid or gas systems because of its durable and precise construction. Its compact design makes it easy to install even in small areas.
Feature of Trafag PST4M 9M4 Picostat Pressure Switch
- High Accuracy: Provides accurate pressure control with a low tolerance.
- Compact and Sturdy Design: Suitable for heavy industrial applications, its design is made of materials that resist corrosion.
- Broad Pressure Range: With pressure ranges ranging from low to high, it can support a variety of applications.
- Different Connection: Choices Different electrical and mechanical setups to suit certain requirements are available.
- Reliable Switching Capacity: Able to manage high currents for regulating a range of devices.
- High Temperature Resistance: Capable of functioning across a broad spectrum of extremely hot and cold temperatures.
- Global Certifications: Complies with global industrial standards including CE and RoHS.
Application of Trafag PST4M 9M4 Picostat Pressure Switch
- Oil and Gas Industry: For controlling and regulating pressure in processing and pumping systems.
- Chemical Processing: To guarantee the proper pressure in pipes or reactors.
- HVAC: In systems for cooling, heating, and ventilation.
- Automotive Industry: Used in pneumatic and hydraulic systems as a pressure sensor.
- Manufacturing: To ensure stable operating pressure in automated machinery.
Technical data of Trafag PST4M 9M4
Product code | 9M4 |
Name | PST4M |
Designation | Picostat Pressure Switch |
Product category | Mechanical pressure switches |
Measuring range | 1 … 10 to 10 … 100 bar 14 … 150 to 150 … 1500 psi |
Measuring principle | Membrane |
Applications | Engine manufacturing Hydraulics Machine tools Railways Shipbuilding |
Approval / conformity | ABS, BV, CCS, DNV-GL, KRS, LRS, RINA, EN60730-1/ EN60730-2-6: Type 2.B.H |
Repeatability | ± 2.0 % FS typ. |
Output signal | 1 Floating change-over contact (SPDT) |
Electrical connections | EN175301-803-A (DIN43650-A) |
Pressure connections | G1/8″ f, G1/4″ f, M10x1.0 f |
Media temperature | 0°C … +80°C |
Ambient temperature | 0°C … +80°C |
Source: trafag.com
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