Images are representations only.
Model 1500A High Flow Positive Bias Relay
Brand: Fairchild Industrial ProductsThe Rotork Fairchild Model 1500 Positive Bias Relay is designed for applications that require an output pressure that is the sum of a controlled input signal plus a fixed bias.
This pneumatic relay provides high output flow at an output pressure that represents the input signal pressure plus a preset bias.
The output of the relay is the sum of the spring bias, set with the Range Screw, plus a pneumatic input signal. (Po = Ps + K); where Po is output pressure, Ps is signal pressure, and K is the spring constant set by the Range Screw.
Features- Control sensitivity of 1" water column.
- Large Supply and Exhaust Valves.
- Soft Supply and Exhaust Valve seats.
- A balanced Supply Valve.
- Aspirator Tube design.
- A separate Control Chamber.
- Unit construction.
- Allows use in precision applications.
- Provides high forward and exhaust flows.
- Minimizes air consumption.
- Minimizes the effect of any supply pressure variation.
- Compensates downstream pressure droop under flow conditions.
- Isolates the diaphragm from the main flow to eliminate hunting and buzzing.
Specifications
Pressure Range
- 0-10 psig : 0-0.7 bar : 0-70 kPa
- 0.5-30 psig : 0.03-2 bar : 3-200 kPa
- 1-60 psig : 0.1-4 bar : 10-400 kPa
- 2-150 psig : 0.1-10 bar : 15-1000 kPa
Pipe/Port Size
- 3/8"
- 1/2"
- 3/4"
Pipe/Port Thread Type
- NPT
- BSPT
Max. Supply Pressure
- 250 psig : 17.0 bar : 1700 kPa
Flow Capacity
- 150 scfm (255 m³/hr) @ 100 psig : 7.0 bar : 700 kPa supply & 20 psig : 1.5 bar : 150 kPa setpoint.
Supply Pressure Effect
- Less than 0.1 psig : 0.007 bar : 0.7 kPa for a 100 psig : 7.0 bar : 700 kPa change in supply pressure.
Exhaust Capacity
- 40 scfm (65 m³/hr) where downstream pressure is 5 psig : 0.35 bar : 35 kPa above 20 psig : 1.5 bar : 150 kPa setpoint.
Max. Signal or Output Pressure
- 150 psig : 10 bar : 1000 kPa
Sensitivity
- 1” (2.50 cm) W.C.
Ambient Temperature Limits
- -40° F to +200° F (-40° C to 93.3° C)
Tapped Exhaust Vent
- Tapped
Tamper Proof
- Tamper Proof
Body & Housing Material
- Aluminum
Diaphragm Material
- Nitrile on Dacron
Trim Material
- Brass, Zinc-Plated Steel
Ambient Temperature Range
- -40° to 93.3° C (-40° to 200° F)
BSP Connection
- 1/2" BSPT Female
- 3/4" BSPT Female
- 3/8" BSPT Female
Exhaust Port
- Tapped Exhaust
Trim Material
- Brass
- Zinc-Plated Steel
Enclosure, Body Material
- Aluminum
Diaphragm Material
- Nitrile on Dacron
Pressure Range
- bar: 0 to 10
- kPa: 0 to 1,000
- psig: 0 to 150
Sensitivity
- 1 inH₂O (2.54 cm)
Standard Features
- Tamper-Proof
Exhaust Capacity - Relieving Units Only
- 40 scfm (65 m³/hour)
Supply Pressure Effect
- Less than psig: 0.1 (bar: 0.07, kPa: 0.7) Per psig: 100 (bar: 7, kPa: 700) Change
NPT Connection
- 1/2" NPT Female
- 3/4" NPT Female
- 3/8" NPT Female
Flow Capacity
- 150 scfm (255 m³/hour) at psig: 100 (kPa: 700, bar: 7) Supply & psig: 20 (kPa: 150, bar: 1.5) Set Point
Supply Pressure - Maximum
- bar: 17
- kPa: 1,700
- psig: 250