Flowserve Electro-pneumatic Transducers - Manual (Page 2)

30-2
NOTE: The air supply should conform to ISA standard
S7.3 (a dew point at least 18 F below ambient tempera-
ture, particle size below 5 microns, oil content not to
exceel 1 part per million).
Control Valve Mounting
To mount the transducer directly to the control valve, a
bracket must be fabricated by the user.
1. Securely attach the bracket to the control valve in a
position that will not interfere with the movements of
either the valve stem, the positioner linkage, or
accessories.
2. Mount the transducer to the bracket using the two
quarter-inch holes that are drilled through the trans-
ducer housing. Be certain the
1 /
8
-inch NPT holes
are accessible.
Two-inch Pipe Mounting
To mount the transducer remotely from the control
valve, use the two-inch pipe mounting kit available from
the factory (part number 70691.999).
1. Attach the mounting kit in any position as required
by the user to a two-inch pipe.
2. Mount the transducer to the mounting kit. Be certain
the 1 /
8
-inch NPT holes are accessible.
Air Connections
1. Screw the pipe or tube fittings into the 1 /
8
-inch NPT
holes on either side of the housing.
CAUTION: The supply air pressure must not
exceed 20 psi (+1.5 psi).
2. Be certain there are no air leaks in fittings.
Control Signal (Milliamp) Connections
1. Remove the housing cover.
WARNING: Make sure the area is clear of com-
bustible gasses before removing the cover,
unless the unit has been installed with the ap-
propriate intrinsically safe barriers.
2. Attach signal wiring to the transmitter terminal
block, using caution to attach the positive and
negative wires tot he appropriate terminal.
CALIBRATION
When an electro-pneumatic transducer installed in the
field requires output signal adjustment, refer to Figure
1 and proceed as follows:
CAUTION: If the valve cannot be stroked without
disturbing the process fluid, it may be necessary to
bypass or remove the valve from the line before
calibrating the transducer.
WARNING: Prior to removing the valve from the
line, depressurize the line to atmospheric pressure.
Drain all process fluids and (if caustic of hazardous
material are present) decontaminate the valve.
Failure to do so can cause serious injury.
Zero and Range Adjustments
1. Remove the housing cover.
WARNING: Make sure area is clear of combus-
tible gases before removing the cover, unless
the unit has been installed with the appropriate
instrinsically safe barriers.
2. Check zero with an air supply of 20 psi connected
and an input signal of 4 mA. Any deviation in the
output signal from 3 psi can be corrected with the
zero adjustment screw.
3. Increase the input signal to 20 mA. Any deviation in
the output from the value of 15 psi can be corrected
with the range potentiometer.
REVERSING SIGNAL
If the signal to the I/P transducer must be reversed,
consult factory for instructions.
CLEANING FLAPPER AND NOZZLE
If the flapper and nozzle become sticky and need to be
cleaned of dirt build-up, refer to Figure 1 and proceed as
follows:
1. Remove the housing cover.
WARNING: Make sure are is clear of combus-
tible gases before removing the cover, unless
the unit has been installed with the appropriate
intrinsically safe barriers.
2. Remove the rectangular cover by loosening center
screw.
3. Using a heavy piece of lint-free-paper soaked in
denatured alcohol, gently lift the flapper and nozzle.
Work paper back and forth until dirt build-up is re-
moved.
CAUTION: Do not lift the flapper more than 1/16-
inch or it may be damaged.
4. Replace the rectangular and housing covers.
DISASSEMBLING AND REASSEMBLING
BOOSTER SECTION
Disassembling Booster Section
To disassemble the booster section, refer to Figure 2
and proceed as follows:
1. Remove I/P transducer from line.
2. Using a three millimeter hex wrench, remove the
two housing bolts (119).
3. Carefully remove the lower three sections of the
booster assembly.