Siemens Process Instrumentation Datasheets for Pneumatic Relays and Volume Boosters

Pneumatic relays and volume boosters control output air flow and pressure in response to a pneumatic input signal.  They can perform simple functions such as boosting or scaling the output, or use complex reversal, biasing, and math function operators.
Pneumatic Relays and Volume Boosters: Learn more

Product Name Notes
Pneumatic Relays -- Model 661 Series 661 Amplifying Relays are fixed-gain force-balance instruments, which incorporate bias adjustment that amplify pneumatic instrument signals. For example, a 3-15 psi signal can be amplified to operate a 3-27...
Integral Volume Booster The Integral Volume Booster was designed for use on pneumatic actuators that require high flow for fast stroking times. The unit reproduces pneumatic signals in a 1:1 ratio for applications...
Pneumatic Relays -- Model 66 The Model 66 Amplifying and Reducing Relays are used to increase or decrease control-circuit pressure signals. Its input pressure, acting upon the effective area of the top diaphragm, produces pressure...
High-Capacity Booster Relay -- 61H The series 61 Booster Relays reproduce pneumatic signals in a 1:1 ratio for applications where input isolation or increased flow capacity are required. 61H is a High-Capacity Booster Relay designed...
High-Capacity Booster Relay -- 61VH The series 61 Booster Relays reproduce pneumatic signals in a 1:1 ratio for applications where input isolation or increased flow capacity are required. 61VH is a High-Capacity Booster Relay designed...
Pneumatic Relays -- Model 62 The Series 62 Constant-Differential Relays serve as air-flow controllers maintaining a constant air purge for ech setting of an integral needle valve. By maintaining a constant-differential pressure drop across a...
Pneumatic Relays -- Model 63 The Series 63 Constant-Differential Relays are used in conjunction with an external needle valve to provide constant volume flow rates of liquids or gases over a continuously adjustable range.