• Murphy

PSB

The PSB switch is a direct-mount switch for critical pressure points.

It has one limit contact that can be used to activate an alarm, actuate indicator lights or shutdown equipment. The construction of this instrument is the same as Murphy’s time-proven Swichgage® instrument. A precision machined brass mounting plate and port captures a high-quality, stamped beryllium copper diaphragm. The single-pole, double-throw (SPDT) snap-switch is operated directly from the diaphragm for quick acting and positive switching. Trip point is factory preset according to your specifications. Housing is weather sealed to prevent entry of moisture, dust, etc. A glass-filled nylon terminal block with screw terminal connections gives the PSB switch a real advantage in industrial engine applications. The PSB is ideal when reading is not desired, but pressure is critical to operational efficiency. Intended for use in general purpose non-classified areas.

  • CE (European Conformity) mark
Specifications Downloads
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Specifications

Housing: Plated steel.

Pressure Connection: 1/8-27 NPT, Brass.

Diaphragm: Formed beryllium copper (heat treated).

Pulsation Dampener: Brass (removable for cleaning)

Terminal Block: Three #4-40 screws.

Accuracy: Trip point: ±3% of full scale.

Switch reset differential: ±7% of full scale.

Repeatability: ±1% of full scale.

Contact Rating: SPDT 3 A @ 30 VDC inductive.

Maximum Pressure: See Trip Point Chart

Temperature Range:

  • Ambient= -40°F (-40°C) thru 150°F (66°C)
  • Process= -40°F (-40°C) thru 250°F (121°C)

Pressure Range: Specify from 15-400 psi (0.21 kPA- 2.76 MPa) [1.03- 27.58 bar].

Contact: Operates on rising or falling pressure (specify).

Shipping Weight: 8 oz. (0.25 kgs).

Shipping Dimensions: 3 x 2-3/4 x 2-3/4 in. (76 x 70 x 70 mm).

Trip Point Chart:

Ranges available psi (kPa/MPa) [bar]Factory setting* psi (kPa) [bar] FallingMaximum pressure psi (kPa) [bar]
0-15 (0-103) [0-1.03]3 (21) [.21]30 (207) [2.07]
0-30 (0-207) [0-2.07]7 (48) [.48]60 (414) [4.14]
0-50 (0-345) [0-3.45]10 (69) [.69]100 (0-689) [0-6.89]
0-75 (0-517) [0-5.17]15 (103) [1.03]150 (0-1.03) [0-10.34]
0-100 (0-689) [0-6.89]20 (138) [1.38]200 (0-1.38) [0-13.79]
0-150 (0-1.03) [0-10.34]30 (207) [2.07]300 (0-2.07) [0-20.70]
0-200 (0-1.38) [0-13.79]50 (345) [3.45]400 (0-2.76) [0-27.60]
0-300 (0-2.07) [0-20.70]75 (517) [5.17]500 (3.45) [34.50]
0-400 (0-2.76) [0-27.60]150 (1.03) [10.34]500 (3.45) [34.50]
*These points will be used if switch trip point is not specified.

Additional product documentation can be found on our product support website or by clicking the Help Center button above.