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Instruction Manual
June 2008
MINOR LOOP
GAIN ADJ
FIXED
RESTRICTION
38A6592-A
B2147 / IL
2. Remove the four socket head screws (key 169),
and lift the bypass body (key 161) and bypass body
gasket (key 163) from the bypass body adaptor (key
162). Inspect the gasket and replace if necessary.
3. Remove the wire tie (key 166) and the retaining
ring (key 165).
4. With a gentle pulling and turning motion, slide the
bypass lever assembly (key 160) from the bypass
body (key 161). Inspect the O-rings (keys 159, 167,
and 168) for nicks or wear and replace if necessary.
Apply lubricant (key 153) to the O-rings before
replacement.
5. Remove the two socket head screws (key 54)
and remove the bypass body adaptor (key 162) and
adaptor gasket (key 164) from the gauge block (key
158).
6. Inspect the adaptor gasket (key 164) and replace
if necessary.
CROSS-OVER
ADJ
RELAY
A
ZERO ADJ
SUMMING BEAM
FLAPPER
NOZZLE
CAVITY A
CAVITY B
MAGNET
COIL 4 TO
SUPPLY
20 mA INPUT
Figure 24. Schematic of the 3621JP Positioner
3610J and 3620J Positioners
RELAY BEAM
RELAY
B
RANGE SPRING
COARSE
SPAN
ADJ
PIVOT A
INPUT MODULE
PIVOT B
FEEDBACK
LEVER
FLAPPER
FIXED
RESTRICTION
NOZZLE
Disassembling the Gauge Block
Refer to figure 26 for key number locations, unless
otherwise indicated, while disassembling the gauge
block.
1. If the positioner has a bypass valve, perform
steps 1, 5, and 6 of the Disassembling the Bypass
Valve procedures.
2. Release all pressure from the positioner.
Disconnect the supply, instrument, and output
tubing.
WARNING!
medium, ensure adequate ventilation and remove
any ignition sources.
3. Remove all gauges [key 79 (not shown), 80
and 81], pipe plugs (key 72 and 78), or tire valves
(key 73, not shown) from the gauge block (key 158).
4. Remove the two socket head screws (key 187)
and remove the gauge block from the positioner
case (key 115A, figure 25). Inspect the four O-rings
(key 159) and replace if necessary. Apply lubricant
(key 153) to the O-rings before replacement.
SUPPLY PRESSURE
NOZZLE PRESSURE
INPUT SIGNAL
OUTPUT SIGNAL
OUTPUT SIGNAL
AIR
SUPPLY
FINE
SPAN
ADJ
COUNTER SPRING
PISTON
ACTUATOR
If using gas as the supply
31
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