Externally Adjusted
- 19 models
- Sensing pressures to 25,000 psi
- Air valve* 3-way, 2-way normally open or closed
An Air Pilot Switch is a pressure switch. These units produce a pneumatic signal up to 150 psi at any sensing pressure within their adjustment range. The signal valve may be piped normally open, normally closed*, 3-way or 2-way depending on model.
All models use a 2-position poppet-type air signal valve which is shifted from its normal position by a rod from the sensing end which first must overcome an adjustable force spring (styles A and C) or air-regulated dome loader (style B).
Remote Air Adjusted "Remoteset™"
- 4 models
- Sensing pressures to 60,000 psi
- Air valve* 3-way normally closed, 2-way normally closed, normally open
Internally Adjusted
- 34 models
- Sensing pressures to 60,000 psi
- Air valve* 3-way normally closed, 2-way normally closed, normally open
- Direct automatic start/stop control of any Haskel pump, gas booster, air amplifier or indirectly to the drive of any pump or compressor sensing either output or suction (schematics 1 & 2)
- Valve actuators (schematic 5)
- Pneumatic alarm signals
- Replace an explosion-proof pressure switch in hazardous applications (schematic 6)
Style A
STYLE | MODEL NO. | MAXIMUM SENSING PRESSURE (PSI) | AIR VALVE | ADJUSTABLE RANGE PSI | APPROXIMATE DIMENSIONS (inches) | PORTS | ||||
|---|---|---|---|---|---|---|---|---|---|---|
SERVICE SENSING PORT | ||||||||||
LIQUID OR GAS | OXYGEN GAS | NORMALLY OPEN | NORMALLY CLOSED | LENGTH | OUTSIDE DIA. | AIR (2) | SENSING (3) | |||
A | 51940-1 | -11 | 10,000 Standard | 3-Way. | 2000 - 10,000 | 3500 - 10,000 | 8 | 2 | 1/4" NPT | 1/4" NPT |
52160-1 | N/A | 25,000 | 6000 - 11,000 | 7000 - 12,000 | 8-5/8 | 2 | 1/8" NPT | 1/4" Super-pressure | ||
52180-1 | -11 | 10,000 Standard | 60 - 240 | 150 - 300 | 7-5/8 | 2 | 1/4" NPT | 1/4" NPT | ||
Style B
STYLE | MODEL NO. | MAXIMUM SENSING PRESSURE (PSI) | AIR VALVE | ADJUSTABLE RANGE PSI | APPROXIMATE DIMENSIONS (inches) | PORTS | RATIO | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
SERVICE SENSING PORT | |||||||||||
LIQUID OR GAS | OXYGEN GAS | NORMALLY OPEN | NORMALLY CLOSED | LENGTH | OUTSIDE DIA. | AIR (2) | SENSING (3) | ||||
B | 55792 | N/A | 25,000 | 3-Way. | 4500 - 23,400 with 20-100 Dome Load. | 8-3/4 | 4-1/4 | 1/8" NPT | 1/4" Super-pressure | 245:1 | |
55796 | N/A | 600 | 135 - 530 with 20-100 Dome Load. | 7-1/2 | 1/4" NPT | 6:1 | |||||
Style C
STYLE | MODEL NO. | MAXIMUM SENSING PRESSURE (PSI) | AIR VALVE | ADJUSTABLE RANGE PSI | APPROXIMATE DIMENSIONS (inches) | PORTS | ||||
SERVICE SENSING PORT | NORMALLY OPEN | NORMALLY CLOSED | LENGTH | OUTSIDE DIA. | AIR (2) | SENSING (3) | ||||
LIQUID OR GAS | OXYGEN |
| ||||||||
C | 28755-1 | -11 | 10,000 Standard | 3-Way N.C. |
| 1500-10,000 | 5-11/16 | 1-3/8 | 1/8" NPT | 1/4" NPT |
28791-1 | -11 | 2-Way N.0. | 2500-10,000 |
| 6-1/8 | 1-3/8 | 1/4" NPT Out | 1/4" NPT | ||
28974-24 | N/A | 25,000 | 3-Way N.C. |
| 6000-25,000 | 8 | 2 | 1/8" NPT | 1/4" Super-pressure | |
28974-59 | N/A | 60,000 | 3-Way N.C. |
| 20,000-60,000 | 8 | 1/8" NPT | |||
29074-25 | N/A | 25,000 | 2-Way N.O. | 6000-25,000 |
| 8 | 1/4" NPT Out | |||
55230-1 | -11 | 600 | 3-Way N.C. |
| 12-37 | 6-1/2 | 2-1/8 | 1/8" NPT | 1/4" NPT | |
55416-1 | -11 | Pipe either (1) | 13-47 | 13-47 | 7 | 2-1/8 | 1/4" NPT N.O. | 1/4" NPT | ||
56650-1 | -11 | 10,000 Standard | 3-Way N.C. |
| 50-180 | 6-5/16 | 1-3/8 | 1/8" NPT | 1/4" NPT | |
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