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 PST4K 9K4 Picostat Pressure Switch
The 9K4 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.
A pressure control device made for industrial applications requiring accurate and dependable pressure measurement and control is the Trafag PST4K 9K4 Picostat Pressure Switch.
It is well-known for its broad range of pressure control and combines an effective switch with a sophisticated pressure sensor to provide precise control in a range of applications.
The Trafag PST4K 9K4 is appropriate for a variety of industrial applications where stability and dependability in pressure management are necessary due to its small size and sturdy construction.
Feature of Trafag PST4K 9K4 Picostat Pressure Switch
- Precise Pressure Assessment and Management: offers a broad variety of pressure management capabilities together with extremely accurate pressure measurement.
- Small and Sturdy Design: Constructed from premium materials including stainless steel, it offers long-term usage and resilience to extreme weather conditions.
- Adaptable Pressure Range: Ideal for a range of industrial applications requiring variable pressure control, it may be employed in several pressure ranges.
- Digital or Analog Signal Output: offers a choice of digital (Modbus, HART) or analog (4-20 mA) signal output, making integration with industrial monitoring and automatic control systems simple.
- Able to Handle Adversities: operates effectively across a broad temperature range, from -40°C to +85°C, making it appropriate for use in harsh conditions.
- Calibration Ease: has an easy-to-use calibration system that guarantees reliable measurements even in the face of fluctuating operating circumstances.
Application of Trafag PST4K 9K4 Picostat Pressure Switch
- The Energy Sector: Pressure in energy combustion, power production systems, and energy distribution installations should be monitored and controlled.
- The Chemical and Pharmaceutical Sector: used to regulate pressure in procedures involving chemicals and pharmaceuticals that call for accurate and consistent pressure measurement.
- To guarantee peak performance, HVAC (Heating, Ventilation, and Air Conditioning) regulates the pressure in heating, cooling, and ventilation systems.
- Industry for Water and Sewage Treatment: To guarantee constant flow and effective treatment, pressure in filtration, water treatment, and sewage systems should be monitored.
- Automobile Sector: monitoring the pressure in industrial vehicles’ and equipment’s hydraulic and pneumatic systems.
- The Oil and Gas Sector: used to avoid harm from uncontrolled pressure fluctuations by controlling pressure in gas and oil distribution lines.
Technical Data ofnTrafag PST4K 9K4
Product code | 9K4 |
Name | PST4K |
Designation | Picostat Pressure Switch |
Product category | Mechanical pressure switches |
Measuring range | 1 … 10 to 40 … 400 bar 14 … 150 to 580 … 5800 psi |
Measuring principle | Piston |
Designation of application | NULL |
Applications | Engine manufacturing Hydraulics Machine tools NULL Railways Shipbuilding |
Approval / conformity | ABS, BV, CCS, DNV-GL, KRS, LRS, RINA, EN60730-1/ EN60730-2-6: Type 2.B.H |
Repeatability | ± 1.0 % 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 | –25°C … +125°C |
Ambient temperature | -25°C … +85°C |
Source: trafag.com
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