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.
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.
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) |
| 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 |
