EXPD 920/924/932 Differential Pressostat

The Trafag EXPD 920/924/932 ex differential pressostat electromechanical pressure switches provide high vibration resistance and switch point precision in combination with an extremely robust and durable design. This results in switches that can be operated for decades without requiring maintenance, even under harsh conditions. Various designs with bellows, membrane and piston sensors cover a wide variety of pressure ranges, media and load profiles for many different applications.


  • Rugged aluminium housing
  • Protection IP66
  • Ex d e IIC T6 Gb
  • Ex tb IIIC T80°C Db
  • Any mounting position possible
Applications<x> II 2 G / D
CategoryPressure switches
Dielectric strength

1.5 kV


5...25 Hz: ±1.6 mm

25...100 Hz: 4g

Pressure connectionsG1/4" f, G1/8" f, G1/2" m
Media temperature-50°C ... +150°C
Shock50g/ 11ms
Ambient temperature-50°C ... +65°C
Type of protection

Areas with gaz explosion hazards:

II 2 G Ex d e IIC T6 Gb

Areas with dust explosion hazards:

II 2 D Ex tb IIIC T80°C Db

Output signal1 Floating change-over contact (SPDT)
TEB typ. @ -25 ... +85°C-1 ... 6 to -1 ... 18 bar
Measuring range-1 ... 6 to -1 ... 18 bar