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Emerson Fisher 2625 Buku Petunjuk
Instruction Manual
D100348X012

Supply Pressure

Supply pressure must be clean dry air or noncorrosive gas. A high capacity filter, such as the 262K is recommended for
use with the 2625 volume booster.
NOTICE
Use a clean, dry, oil‐free air supply with instruments containing EPDM components. EPDM is subject to degradation when
exposed to petroleum based lubricants.
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
optional pipe away vent construction should be used in applications using a flammable or hazardous gas as the supply
pressure medium. This option will allow the flammable or hazardous gas to be collected or remotely vented to a safe
location.

Exhaust Ports

Exhaust to the atmosphere is through exhaust ports in the side of the unit. Keep the exhaust ports free of any
obstructions or foreign materials that might clog them.
The optional pipe away vent construction exhausts though a single 1/2 NPT port on the side of the unit. Remote vent
piping can be installed in this port to route the booster exhaust to a desired remote vent or collection location.

Operating Information

The only operating requirement of the volume booster is the adjustment of the bypass restriction for stable actuator
performance. Although systems with different characteristics may require different adjusting techniques, the
following adjustment procedure is recommended when using the actuator for throttling control.
Note
When sizing the booster, select the lowest C
loop may lead to stability problems, thus requiring the bypass to be opened so far that the booster will never operate.
Prior to operation, turn the bypass restriction adjusting screw (figure 2) four 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.
If the actuator is to be used for on‐off control, the restriction should be closed (turned fully clockwise).
that will meet the stroking speed specifications. Oversizing the booster in a closed
g
2625, 2625SST, and 2625NS Volume Booster
September 2022
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