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FANTINELLI Srl

Diaphragm pressure switches

Diaphragm pressure switch  
PS 389/489

• Models

- PS 389: ranges included between 1 and 160 bar;

- PS 489: ranges included between 6 and 600 mbar.


• Casing

- case and cover in AISI 304 stainless steel with bayonet lock.

• Protection degree (according to EN 60529)

- IP 65.


• Pressure connection AISI 316L stainless steel:

- 1/4-18 NPT (1/4 NPT female) - standard;

- G 1/2 B (1/2 Gas or BSP male) or 1/2-14 NPT EXT (1/2 NPT male) - on request.


• Pressure element

- AISI 316 stainlees steel diaphragm;

- diaphragm coated (see specific heading).


• Pressure element gasket

- di P.T.F.E..


• Setting ranges

- see table PS 1.


• Electrical specifications

- 1 or 2 microswitches with change-over contacts (SPDT) - see table PS 2.


• Differential

- Fixed, of adjustable 10÷.50% of setting range for ranges ? 1 bar - see tables PS 1 and PS 2.


• Repeatability

- ? 1% of Full scale deflection.


• Set-point adjustment

- internal, micrometric adjustable.


• Electrical wiring

- terminal box.


• Electrical connection

R 1/2 (1/2 Gas or BSPT female) thread (others on request).


• Ambient temperature

- -25 ÷ +65 °C.


• Operating temperature

- max 100 °C.


• Thermal drift

- ? 0,05% every °C of variations.


Diaphragm pressure switchs

  • watertight casing;
  • ranges included between -6 mbar and 160 bar.

This instrument has a diaphragm that, under the process fluid pressure, acts directly on the microswitch, through a self-centering pivot. The simple structure of the instrument grants a reliable mechanic switch and a long working life.