详情
The P74FA-9700 is a PENN/Johnson Controls Series P74 Differential Pressure Switch designed without a time delay. It is primarily engineered to sense pressure differences between two points in fluid systems, acting as an operating or limit control.
Technical Specifications
- Brand / Manufacturer: Johnson Controls (PENN)
- Operating Pressure Range: 0 to 1 bar (0 to 100 kPa)
- Switching Differential: 0.1 bar fixed
- Switch Type: SPDT (Single Pole Double Throw), 3A at 230VAC / up to 15A
- Contact Function: Open High
- Pressure Connection: 1/4-18 NPT Female connection
- Medium Compatibility: Exclusively designed for water and non-corrosive liquids
Key Applications
- Chiller Systems: Acts as a proof-of-flow application in water chillers to signal a dangerous loss of water.
- HVAC Systems: Detects liquid flow or circulation failures across a water-cooled condenser or commercial heating systems.
- Compressor Protection: Monitors lube oil pressure differentials on commercial refrigeration compressors.
Operation and Adjustments
The control mechanism switches state when the measured differential pressure rises to the selected setpoint. It returns to its normal state when the pressure drops below the setpoint minus the fixed mechanical switching differential. Setpoint adjustments can be made via a notched cam located on top of the control housing.
If you are sourcing this part for a replacement or a new project, you can buy it directly from specialized partner GEASB.
If you are troubleshooting a system or looking for a replacement, let us know:
- Is your current unit failing to trip, or is it leaking?
- Are you looking for a direct replacement, or do you need help finding an equivalent alternative?
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