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Model 14 Positive & Negative Bias Relay
Brand: Fairchild Industrial Products - by Rotork
Designed for applications that require an output pressure that is the sum of a controlled input signal plus or minus a fixed bias, Rotork Fairchild's Model 14 Biasing Pneumatic Relay provides versatility in its ability to provide either positive or negative biasing in a single unit.
The output of the Model 14 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 combined spring constant.
Features- Control sensitivity of 1/2" water column allows use in precision applications
- A balanced Supply Valve minimizes the effects of supply pressure variation
- An Aspirator Tube minimizes downstream pressure droop under flow conditions
- A separate Control Chamber isolates the diaphragm from the main flow to eliminate hunting and buzzing
- Mounting Bracket is available
- Canadian Registration Number (CRN) certification for all territories and provinces
Specifications
Actuator Type
- Knob Adjust
- Tamper-Proof
Ambient Temperature Range
- -40° to 93° C (-40° to 200° F)
BSP Connection
- 1/2" BSPT Female
- 1/4" BSPT Female
- 3/8" BSPT Female
Elastomers
- FluoroCarbon (Viton)
- Nitrile on Dacron
- Silicone
Enclosure, Body Material
- Aluminum
Environmental Protection
- Acceptable for use in Zones 1 & 2 for Gas Atmosphere, Groups IIA & IIB & Zones 21 & 22 for Dust Atmospheres
Exhaust Capacity - Relieving Units Only
- 5.5 scfm
- 5.5 scfm (9.35 m³/hour)
- 9.4 m³/hour
Flow Capacity
- 40 scfm
- 40 scfm (68 m³/hour) psig: 100 (bar: 7, kPa: 700) Supply, psig: 20 (bar: 1.5, kPa: 150) Set Point
- 68 m³/hour
Mounting
- None
NPT Connection
- 1/2" NPT Female
- 1/4" NPT Female
- 3/8" NPT Female
Pressure Range
- bar: -1.2 to 0.7
- kPa: -120 to 700
- psig: -18 to 100
Relief
- Non-Relieving
- Relieving
Sensitivity
- less than 1/2" WC (1.27 cm)
Signal or Output Pressure - Maximum
- bar: 10
- kPa: 1,000
- psig: 150
Supply Pressure - Maximum
- bar: 17
- kPa: 1,700
- psig: 250
Supply Pressure Effect
- psig: 0.1 (bar: 0.007, kPa: 0.7) for a psig: 100 (bar: 7, kPa: 700) Change in Supply Pressure
Trim Material
- Brass
- Stainless Steel
- Zinc-Plated Steel
Vent
- Straight
- Tapped Exhaust