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Instruction Manual
D103542X012
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Mounting
The volume booster is typically nipple-mounted between the pneumatic supply source and the actuator. 1 NPT
schedule 80 pipe fittings are recommended for aluminum constructions.
Pressure Connections
The input signal connection is 1/4 NPT. The supply and output connections are 1 NPT. Ensure that the piping is of
proper size to meet the capacity demands of the booster and that you equip the actuator with properly sized input
connections.
Supply Pressure
Supply pressure must be filtered clean dry air or noncorrosive gas.
WARNING
If a flammable or hazardous gas is to be used as the supply pressure medium, personal injury, property damage or
equipment damage could result from fire or explosion of accumulated gas or from contact with hazardous gas. The volume
booster has no provision for piping away the vented exhaust gas. Therefore, do not use flammable or otherwise hazardous
gas as a supply medium unless the unit is in a well-ventilated area and all ignition sources have been removed.
Exhaust Passages
Exhaust to the atmosphere is through exhaust passages located on the perimeter of the diaphragm spacer assembly.
Keep the exhaust passages free of any obstructions or foreign materials that might clog them.
Operating Information
Proper installation of the SS-263 and adjustment of the bypass restriction and tuning of the digital valve controller are
required for stable actuator performance. Installation and adjustments are typically performed at the factory.
Retain original piping configuration when replacing an SS-263 volume booster that was originally installed at the
factory.
To calibrate and tune the volume booster, turn the bypass restriction adjusting screw (figure 3) two turns
counterclockwise from the fully closed position. With the actuator in operation, slowly turn the restriction clockwise
until the booster operates in response to large changes in the input signal, yet allows small changes to move the
actuator without initiating booster operation. When additional capacity is required, multiple boosters can be used in
parallel. The minimum required adjustment for each bypass restriction adjustment screw is 1/6 turn, regardless of
configuration.
SS-263 Volume Booster
August 2011
3
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