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Ultra high purity pressure switch

Type: P840 series (316L type)


Service intended


P840 series are specially designed for the ultra-high purity gas distribution system used in a semiconductor, electronic, medical, biotechnology and pharmaceutical industry.


Nominal diameter


50 mm (2")


Switch point accuracy


±2.0 % of full scale


Scale range


0 ~ 28 MPa


Working pressure


Steady pressure : 75 % of full scale value
Fluctuating pressure : 67 % of full scale value


Working temperature


Ambient : -20 ~ 65 °C
Fluid : Max. 100 °C


Temperature effect


Accuracy at temperature above and below the reference temperature (20 ℃) will be effected by approximately
±0.4 % per 10 ℃ of full scale



Standard features



Pressure connection


Type 316L SS electropolished low mount or center back mount
surface finish Ra≤0.25 ㎛
■ ¼" NPT male thread
■ VCR® male or female face seal fitting




Type 316L SS
<6 MPa : C-type bourdon tube
≥6 MPa : Helical type bourdon tube




Type 304SS, Electropolished with pressure relief


Cover and window


Twist-lock polycarbonate




Stainless steel




Black painted aluminium alloy




White PVC, with pointer stop pin
With black/red lettering, dual pressure scale (bar)


Helium leak rate


Tested to confirm leakage rates of less than
10 -9 mbar • ℓ/sec



Standard features





6 feet (2 m)


Maximum switching current


0.5 amps AC/DC noninductive load


Maximum power


10 W/DC, 12 VA/AC


Maximum switching voltage


28 V AC/DC



Download:  CATALOG 

Đồng hồ áp suất công tắc áp suất siêu sạch P841 P842 P843

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