Neodyn 130P Series Pressure Switch / Tamper Resistant

A switch that compares the pressure being sensed to that of a perfect vacuum. Construction requires the reference chamber to be evacuated.

Compact, versatile pressure switch well suited for hazardous or corrosive atmospheres. For low to mid-range pressure applications. Features efficient Nega-Rate® Belleville disc spring for superior set point stability and is field adjustable using 1/8″ allen wrench through the port. Once adjustments are made and the switch is installed, it becomes tamper proof.



Stable Set Points – “Eliminates Constant Recalibration”

  • No moving parts except during actuation—no spring fatigue or wear.
  • Set point is mostly a function of the negative rate Belleville spring—variables in snap action electrical have little effect on the set point.
  • Total movement of the Belleville spring compensates for any relocation of the electrical due to case growth—consistent set point over temperature change.
  • No linkage utilized—no wear which can affect accuracy.

Vibration Resistant – “Eliminates Contact Chatter”

  • Belleville spring does not preload the electrical prior to actuation—snap action electrical maintains its vibration resistant characteristic.
  • Small mass and inherent stability of the Belleville spring resists chatter caused by vibration.
  • Snap action electrical is ruggedly mounted with minimal bracketry—no spring mounted electricals or linkages.

High Over-Pressure Capability – “No Affect on Set Point Accuracy”

  • Belleville spring does not contain the pressure—no affect on system or proof pressure capability.
  • The pressure sensing portion bottoms out after actuation and is fully supported—pressure sensing parts are designed for high pressure conditions.
  • Limited movement of spring mechanism—no overtravel of the snap action electrical due to high pressure.

High Cycle Lifer – “Millions of Cycle”

  • Short stroke minimizes wear—Belleville spring mechanism is exercised less than .020″.
  • Snap action of Belleville spring reduces electrical arc—prolongs contact life.



  • For low to mid-range pressure aplication


  • aerospace
  • general industrial
  • energy and chemical markets


Model Series

Adjustable Range Number Adjustable Set Point Range Deadband (approximate) Maximum Recommended System Pressure Proof Pressure
Increasing Decreasing
1 2 to 12 1 to 11 1 600 1000
2 10 to 30 7 to 27 3 600 1000
3 30 to 50 25 to 45 5 600 1000
4 50 to 70 44 to 64 6 600 1000
5 70 to 120 60 to 110 10 600 1000
6 120 to 170 105 to 155 15 600 1000

*All values given in psig.

Standard Specification

Model Weather Proof (NEMA 4 and 13 Explosion Proof Hermetically Sealed (NEMA 4X, 7, 9 and 13)
Electrical Snap action electrical switch recognized by Underwriters’ Laboratories, Inc. and CSA International Snap action electrical switch assemblies, Part Numbers 057-0770 & 057-0772 (Form C) and 057-0771 & 057-0773 (Form CC), are listed by Underwriters’ Laboratories, Inc., FM Approvals, CSA International and NCC (INMETRO). See the miscellaneous option N for additional listings.
Electrical Connection 1/2 NPT male conduit connection with PVC insulated 18 AWG, 18″ long leads
Pressure Connection 1/4 NPT Male
Ambient Temperature Range – 40°C to + 82°C
Media Temperature Range – 40°C to + 149°C

*Temperature limits change with O-Ring selection

Adjustment 1/8″ allen wrench through port
Shipping Weight Approximately 13 ounces Approximately 16 ounces


Neodyn 130P Pressure Switch Tamper Resistant (NEMA 4 & 13)

Neodyn 130P Pressure Switch Tamper Resistant (NEMA 4X, 7, 9 & 13)

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