Biasing pneumatic relay M1500A

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Description
Model 1500 Positive Bias Relay is designed for applications that require an output pressure equal to the sum of a controlled pneumatic input signal and a fixed bias. This relay delivers high output flow while maintaining an output pressure that represents the input signal pressure plus a preset bias, suitable for precise control of valves and actuators.

Features

• 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 bias set by the Range Screw.
• Control sensitivity of 1 in water column allows use in precision applications.
• Large supply and exhaust valves provide high forward and exhaust flows.
• Soft supply and exhaust valve seats minimize air consumption.
• A balanced supply valve minimizes the effect of supply pressure variation.
• Aspirator tube design compensates downstream pressure droop under flow conditions.
• A separate control chamber isolates the diaphragm from the main flow to eliminate hunting and buzzing.
• Unit construction allows the Model 1500A to be serviced in-line without removal from the line.

Technical specifications

• Brand: Fairchild
• Model: M1500A
• Product family: FAIRCHILD - Relays
• Function: High-flow positive-bias pneumatic relay (output = input signal + preset bias)
• Output formula: Po = Ps + K (Po = output pressure, Ps = signal pressure, K = spring bias)
• Control / sensitivity: 1 in water column
• Design: large supply and exhaust valves, soft valve seats, balanced supply valve, aspirator tube, separate control chamber
• Maintenance: serviceable in-line (can be serviced without removal from the line)