Ultra high purity pressure switch


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

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Extra Information

Extra Information


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 : -40 ~ 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

Standard Features


Pressure connection Type 316L stainless steel electropolished
low mount or center back mount
surface finish Ra≤0.25 ㎛
¼” NPT male thread
VCRⓡ male or female face seal fitting
Element 316L SS
< 6 MPa : C-type bourdon tube ≥6 MPa : Helical type bourdon tube
Case 304SS,
Electropolished with pressure relief
Cover and window Twist-lock polycarbonate
Movement Stainless steel
Pointer Black painted aluminium alloy
Dial 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
Connection 26 AWG, PVC
10 feet (3 m) leads (2 black wires)
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

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