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Quick Details

  • Place of Origin: Shanghai, China (Mainland)
  • Brand Name: ETT
  • Model Number: GS 150U-3
  • Max. Current: 5A
  • Max. Voltage: 250V
  • Max. Working Pressure: 600mbar
  • Name: gas pressure switch
  • Ambient and gas temperature range: -40° C to 60° C
  • Maximum storage: 70° C
  • Short-circuit Protection: use 8 A quick-acting fuse.

Packaging & Delivery

Packaging Details gas pressure switch Exporting Parking : every piece individual pack in small white box(size 8*8*8 cm)
Delivery Time 14~30 days base on QTY



GS 150U-3






1.Range of  application


GS gas pressure switch provide accurate, reliable monitoring of gas and air pressures for industrial and commercial applications. They are suitable for natural gas, LP, bio-gases and air.





  • Control of gas and air pressures
  • Negative pressure cut-out for gas and
  • air and for low voltage
  • Indication for limitation value
  • Suitable for biologically produced
  • methane
  • Special-design pressure switches

3.Pressure range



4.Technical data


Type of gas: Natural gas, town gas, LPG (gaseous), biologically produced methane,air and fumes.



Pressure connections (Fig. 1):


1 and 2: excess pressure Rp 1/4

3 and 4: negative pressure Rp 1/8,

5: test point acc. to DIN 3391, Ø 9 mm

Max. test pressure: temporarily <15 min.2 bar



Ambient temperature: -15° C to +80° C

Temperature of the gas: -15° C to +80° C

Storage and transportation temperature:

-40° C to +80° C                Fitting position: arbitrary, but preferably with horizontal or vertical diaphragm, please make sure that dirt or humidity does not get into the connections open for aeration. 

The switch point is achieved with increasing pressure and with the diaphragm in a vertical position.

With the diaphragm in a horizontal position the switching pressure is approx. 0.2 mbar higher than the reading. With the diaphragm suspended (connection 1, Rp 1/4,uppermost) the switching pressure is approx. 0.2 mbar less than the reading.

Switching pressure adjustable by means of a scaled handwheel. The switching pressure deviates by max. ±15% from the set setpoint, adjusted when subject to decreasing pressure and with vertical mounting. The reverse and cut of additionally according to the different constructions is made if the adjusted switch point won’t be reached or will be exceeded.


Pressure connections (Fig. 1)


for excess pressure, connections 1 + 2 for negative pressure, connections 3 + 4 for differential pressure, connections 1 or 2 and 3 or 4.


Excess pressure test

Type of gas: gas, air, fumes

Connect excess pressure to connection 1 or 2. 

The upper chamber of the diaphragm must be 

ventilated via connection 3 or 4.


Negative pressure test

Type of gas: air, fumes

Connect negative pressure to connection 3 or 4. 

The lower chamber of the diaphragm must be 

ventilated via connection 1 or 2.


Differential pressure test

Type of gas: air, fumes

Connect the higher pressure to connection 1 or 2. 

Connect the lower pressure to connection 3 or 4. 

Remaining connections must be plugged.



Connections 3 + 4 (negative pressure connection) join the upper chamber (microswitch) and must, therefore, not be connected to any pipework containing gas or a gas/air mixture, air and fumes are not allowed to contain agressive constituents.


Pipe connections (Fig.2)



Electrical Data
Making/breaking capacity:
DG: 24–250 V AC:
I = 0.05 –5 A at cos φ = 1,
I = 0.05 –1 A at


Protective grade: IP 54 in acc. with DIN
40050/IEC 34; Protective classe: 1
Cable-gland: Pg 11
Connection: screw terminals


 5.Materials of Construction
GS pressure switch covers are high quality injection-molded plastic.
Switch housings are glass fiber-reinforced plastic and pressure die-cast aluminum alloy. Diaphragms are nitrile rubber. Enclosures are NEMA 3 (IP 54).


 6.more details






Every piece have  individual small whilt box size:8*8*8 cm, gross weight 0.4kg. 100pcs/ carton







Our Services 



1.Our Advangtage


Superior quality with reasonable price.
Fast reply within 24 hours by Email.
OEM&ODM service base on your specail requirement.
Best Technical support team solve your problem.
One long term strong business support to help you obtain more orders in future.


2.Service process



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