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Model 24 Snap Acting Relay
Brand: Fairchild Industrial Products
The Rotork Fairchild Model 24 Snap Acting Relay is a highly accurate differential relay with snap-acting switching.
The output of the unit will go to supply pressure when the signal is equal to or greater than the setpoint.
The signal pressure must fall below the set point to return the output to zero.
This pneumatic relay's Near Zero Throttling and Pilot Staging result in true snap-action in your application.
Features- Control Sensitivity of 1/8" water column
- Balanced supply valve
- Aspirator tube design
- Separate control chamber
- Unit construction
- Designed for use in precision applications
- Minimizes the effects of supply pressure variation
- Compensates for output pressure droop under flow conditions
- Isolates the diaphragm from the main flow to eliminate hunting and buzzing
- Allows servicing without removal from air line
Specifications
Pressure Range
- 2" W.C. to 10 psig : 0.006-0.7 bar : 0.63-70 kPa
- 0.5-30 psig : 0.03-2 bar : 3-200 kPa
- 1-60 psig : 0.1-4 bar : 10-400 kPa
- 2-120 psig : 0.14-8 bar : 14-800 kPa
Pipe/Port Size
- 1/4"
- 3/8"
- 1/2"
Pipe/Port Thread Type
- NPT
- BSPT
Max. Supply Pressure
- 120 psig : 8.0 bar : 800 kPa
Min. Supply Pressure
- 10 psig : 0.7 bar : 70 kPa
Flow Capacity
- 14 scfm (23.8 m³/hr) @ 100 psig : 7.0 bar : 700 kPa supply, 20 psig : 1.5 bar : 150 kPa setpoint.
CV Rating
- 0.23
Separate Supply to Pilot
- Separate Supply to Pilot
Exhaust Capacity
- 14 scfm (23.8 m³/hr) @ 100 psig : 7.0 bar : 700 kPa drop
Repeatability
- 0.2” (0.5 cm) Water Column
Signal Range
- 2” (5 cm) W.C. to 120 psig : 8.0 bar : 800 kPa
Actuator Adjustment Type (for Output Pressure)
- Knob
Ambient Temperature Limits
- -40° F to +200° F (-40° C to 93.3° C)
Tapped Exhaust Vent
- Tapped
Tamper Proof
- Tamper Proof
Air Consumption
- Less than 0.015 scfm (.03 m³/hr) for 100 psig : 7.0 bar : 700 kPa inlet
Body & Housing Material
- Aluminum
Elastomers Material
- Viton (Fluorocarbon)
Diaphragm Material
- Buna-N on Dacron
Trim Material
- Stainless Steel, Zinc-Plated Steel
Mounting Style
- Line/Pipe Mount
- Panel Mount
Enclosure, Body Material
- Aluminum
Actuator Type
- Knob Adjust
- Tamper-Proof
BSP Connection
- 1/2" BSPT Female
- 1/4" BSPT Female
- 3/8" BSPT Female
Air Consumption
- Maximum
Ambient Temperature Range
- -40° to 93° C (-40° to 200° F)
Sensitivity
- 0.2 inH₂O to 0.5 psig (Depending on Model)
Pressure Range
- bar: 0.03 to 4
- bar: 0.15 to 8
- kPa: 0.63 to 800
- psig: 0.5 to 120
NPT Connection
- 1/2" NPT Female
- 1/4" NPT Female
- 3/8" NPT Female
Elastomers
- Buna-N on Dacron
- Fluorocarbon (Viton)
Trim Material
- Stainless Steel
- Zinc-Plated Steel
Signal or Output Pressure - Maximum
- bar: 8
- kPa: 800
- psig: 120
Vent
- Straight
- Tapped Exhaust
Mounting
- Panel Mount
- Pipe
Supply Pressure - Maximum
- bar: 8
- kPa: 800
- psig: 120
Supply Pressure Effect
- psig: 10 (bar: 0.7, kPa: 70) Use Separate Supply Option if Inlet is less than psig: 10 (bar: 0.7, kPa: 70)
Exhaust Capacity - Relieving Units Only
- 14 scfm
- 14 scfm (23.8 m³/hour) at psig: 100 (bar: 7, kPa: 700) Drop
- 23.8 m³/hour
Flow Capacity
- 14 scfm (23.8 m³/hour)
- 14 scfm (23.8 m³/hour) at psig: 100 (bar: 7, kPa: 700) Supply
- 23.8 m³/hour (30)
Relief
- Relieving