Neodyn 122P Series Pressure Switch adjustable pressure switch for low to mid-range process applications. Efficient Nega-Rate ® Belleville disc spring for set
point stability and vibration resistance. A wide selection of wetted materials, 316 stainless steel body, and interior, plus hermetically
sealed explosion-proof electrical make this switch ideal for chemical process applications.
Neodyn 122P Series Pressure Switch
Neodyn 122P Series Pressure Switch A switch that compares the pressure being sensed too that of a perfect vacuum. Construction requires the reference chamber to be evacuated.
Features
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.
Applications
- aerospace
- general industrial
- energy and chemical markets
Specifications
Model Series
Adjustable Range Number | Adjustable Set Point Range | Deadband (approximate) | Maximum Recommended System Pressure | Proof Pressure | |
---|---|---|---|---|---|
Increasing | Decreasing | ||||
1 | 5 to 75 | 2.3 to 72.3 | 2.7 | 600 | 1000 |
2 | 15 to 150 | 9 to 144 | 6 | 3000 | 5000 |
4 | 50 to 300 | 36 to 286 | 14 | 3000 | 5000 |
5 | 125 to 600 | 100 to 575 | 25 | 3000 | 5000 |
7 | 500 to 1500 | 440 to 1440 | 60 | 3000 | 5000 |
8 | 800 to 2800 | 675 to 2675 | 125 | 3000 | 5000 |
*All values given in psig.
Standard Specification
Model | Explosion Proof Hermetically Sealed (NEMA 4X, 7, 9 and 13) |
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Electrical | 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 | 1/2 NPT Female |
Ambient Temperature Range | – 40°C to + 82°C |
Media Temperature Range | – 40°C to + 149°C *Temperature limits change with O-Ring selection. See Electrical Assembly specification sheet for Temperature Class Ratings. |
Adjustment | Internal, slotted adjustment nut with range scale |
Shipping Weight | Approximately 2 pounds |