• 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