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Pressure and Temperature Measurement • Pressure Switches Precision Sensors PRECISION SENSORS
High Purity Differential Pressure Switch D48W
DESCRIPTION The High Purity Differential Pressure Switches are designed and manufactured specifically for clean processes requiring reliability and longevity. These switches features 2 ports, port 1 is suitable for high purity gases and other media. Port 2 is suitable for dry air or inert gases. All products are 100% Helium leak tested, comply with European safety requirements, bear the CE part mark and are UL recognized.
FEATURES D
• Electron beam welded 316L pressure sensor provides fatigue resistant hermetic barrier to contain the process media of port 1
• Port 1 has a 10 Ra or better electropolished 316L stainless steel wetted surface
• Negative rate "Snap Action" Belleville spring enhances the life of the pressure sensor • "Snap Action" electrical switch minimizes contact bounce and improves contact life • Epoxy seal for strain relief
SPECIFICATIONS Calibration Construction Media
Leakage
Surface Finish Temperature Electrical
Enclosure Installation
Available Settings
Hysterisis (Deadband) Repeatability
Proof Pressure Differential Proof Pressure Both Ports Simultaneousiy
APPLICATIONS • Clean Processes • Load - lock Chambers • Gas Delivery Systems • Mini Environments
All units are factory set to customer specifications
Electron beam welded diaphragm;negative rate "Snap Action" Belleville load spring Port 1: any liquid or gas compatible with 316L stainless steel; Port 2: dry air or inert gas 100% helium leak tested to 1x10⁻⁹ std cc/sec (Port 1) Port 1: 10 Ra or better
Operating: 0 to 130°F; Non-operating: -40 to 180°F; Higher tempareture constructions are available
All units utilize a UL recognized and CSA listed electrical switch. Gold contacts: 1 amp resistive, 0.5 amp inductive at 28 VDC; Silver contacts: 5 amp resistive, 3 amp inductive at 28 VDC, 5 amp resistive at 250 VAC; mechanical contact life up to 10 million cycles
The mechanism, electrical switch and writing are exposed to the media of Port 2 Insentive to mounting attitude 20 to 250 mm Hg differential 20 mm HG + 5% of setting ±5 mm + 2% of setting 100 PSID 300 PSIG