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Pressure switches are safety devices used in positive pressure or differential pressure systems to sense gas or air pressure changes.
Honeywell Pressure Switch, 0.1 to 0.75 psi Pressure, 1/4 in Connection, NPT Connection, 0.03 to 0.1 psi Differential Pressure, -20 to 125 deg F, SPDT Contact Configuration, 7.4 AFL, 44.4 ALR at 120 VAC, 5.1 AFL, 30.6 ALR at 240 VAC Contact, Snap Switching Action, Buna-N Fiber, 3-1/2 in Overall Length, 4-3/4 in Overall Width
| Connection Size | : | 1/4 in |
| Connection Type | : | NPT |
| Contact Configuration | : | SPDT |
| Contact Rating | : | 7.4 AFL, 44.4 ALR at 120 VAC, 5.1 AFL, 30.6 ALR at 240 VAC |
| Differential Pressure | : | 0.03 to 0.1 psi |
| Material | : | Buna-N Fiber |
| Overall Length | : | 3-1/2 in |
| Overall Width | : | 4-3/4 in |
| Pressure Rating | : | 0.1 to 0.75 psi |
| Switching Action | : | Snap |
| Temperature Rating | : | -20 to 125 deg F |
- C645A,B models are for use on natural gas, LP gas, or air
- C645B1047 includes a scaleplate stop to meet American Gas Association (AGA) requirements for gas fired boilers with inputs over 2-1/2 million Btuh
- C645C,D models are for use on air only
- Spring loaded diaphragm actuates snap acting micro switch, switch can be wired to turn on alarm
- C645A, C and D models break control circuit on pressure fall
- C645B models break control circuit on pressure rise
- Lockout and manual reset optional in A and C models
- Removable, zinc-plated cover protects scaleplate and adjusting screw
- Lockout models have external manual reset lever
- Pipe tapings allow selection of positive pressure, differential pressure, or venting connections
- Buna-N fiber-reinforced material for increased control diaphragm strength
- Two seal-off diaphragms for added reliability
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