Fairchild
M21
FAIRCHILD - Relays
Model 21 Adjustable Ratio pneumatic relay has a signal chamber lever arm, whereby the ratio of output pressure to signal pressure is infinitely adjustable. The adjustment range permits signal amplification of 1:30 or signal reduction of 30:1 by rotation of the ratio adjustment knob which moves the fulcrum.
Features
• Output pressure is a function of signal pressure times the ratio of lever arm lengths on either side of the fulcrum. Bias may be introduced by means of the set screws
• Maximum input bias is 3 psig, with a maximum output bias of 9 psig
• The basic mathematical expression for the bias in this relay is Po = (Ps-K1) R+K2, where Po = Output pressure, Ps = Input signal, R = Ratio of setting, K1= Input bias, (-) only, and K2 = Output bias, (+) only
• Adjustable from 30:1 dividing ratio to 1:30 multiplying ratio assures infinite pressure adjustments
• Venturi aspiration system compensates for downstream pressure loss
• Available with both input and output adjustable bias allows versatility in applications
• Floating seal ring isolates control chamber - increased stability by reducing effect of high flows
• Panel or line mounting - easy installation and service in the field
• Maximum input bias is 3 psig, with a maximum output bias of 9 psig
• The basic mathematical expression for the bias in this relay is Po = (Ps-K1) R+K2, where Po = Output pressure, Ps = Input signal, R = Ratio of setting, K1= Input bias, (-) only, and K2 = Output bias, (+) only
• Adjustable from 30:1 dividing ratio to 1:30 multiplying ratio assures infinite pressure adjustments
• Venturi aspiration system compensates for downstream pressure loss
• Available with both input and output adjustable bias allows versatility in applications
• Floating seal ring isolates control chamber - increased stability by reducing effect of high flows
• Panel or line mounting - easy installation and service in the field
Features
Features
• Output pressure is a function of signal pressure times the ratio of lever arm lengths on either side of the fulcrum. Bias may be introduced by means of the set screws
• Maximum input bias is 3 psig, with a maximum output bias of 9 psig
• The basic mathematical expression for the bias in this relay is Po = (Ps-K1) R+K2, where Po = Output pressure, Ps = Input signal, R = Ratio of setting, K1= Input bias, (-) only, and K2 = Output bias, (+) only
• Adjustable from 30:1 dividing ratio to 1:30 multiplying ratio assures infinite pressure adjustments
• Venturi aspiration system compensates for downstream pressure loss
• Available with both input and output adjustable bias allows versatility in applications
• Floating seal ring isolates control chamber - increased stability by reducing effect of high flows
• Panel or line mounting - easy installation and service in the field
• Maximum input bias is 3 psig, with a maximum output bias of 9 psig
• The basic mathematical expression for the bias in this relay is Po = (Ps-K1) R+K2, where Po = Output pressure, Ps = Input signal, R = Ratio of setting, K1= Input bias, (-) only, and K2 = Output bias, (+) only
• Adjustable from 30:1 dividing ratio to 1:30 multiplying ratio assures infinite pressure adjustments
• Venturi aspiration system compensates for downstream pressure loss
• Available with both input and output adjustable bias allows versatility in applications
• Floating seal ring isolates control chamber - increased stability by reducing effect of high flows
• Panel or line mounting - easy installation and service in the field