Fisher 4194B Series Instruction Manual page 2

4194A, B, and C Series
5. Maintenance
Inspection and Maintenance
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Common Controller Parts
Replacing the Process Pressure Scale
Replacing the Relay
Replacing the Case and Cover
Replacing the Gauges
Replacing the Pressure Control Block
Replacing the Supply Gauge, Proportional,
Reset, and Reset Valve Tubing
Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Proportional Band Adjustment
Knob, Nozzle Assembly, and Set Point
Beam Assembly
Replacing the Flapper Assembly and
Flapper Flexure Pivot Assembly
Replacing the Proportional or Reset
Bellows . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Reset Restriction Valve
(4194B Series) . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Rate/Reset Valve Assembly
(4194C Series) . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Anti-Reset Windup
(suffix letter F) Differential Relief Valve
Replacing the Anti-Reset Windup
(suffix letter F) Relief Valve Tubing
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Links
Replacing Link 1 . . . . . . . . . . . . . . . . . . . . . . .
Replacing Link 2 . . . . . . . . . . . . . . . . . . . . . . .
Replacing Link 3 . . . . . . . . . . . . . . . . . . . . . . .
Replacing Link 4 . . . . . . . . . . . . . . . . . . . . . . .
Replacing Link 5 . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Capsular Element
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Long Pivot Assembly
Replacing the Short Pivot Assembly
Replacing the Process Drive Flexure
Replacing the Process Tubing
Capsular Element Maintenance Calibration
Precalibration Procedures
Aligning the Drive Bracket Assembly
Setting the Travel Stops
Aligning the Linkage
Zero and Span Adjustment
Remote Set Point (suffix letter M)
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Remote Set Point
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Remote Set Point
Assembly Parts
Replacing Pivot Assembly A (key 114)
Replacing Pivot Assembly B (key 115)
Replacing the Drive Flexure
Replacing the Remote Set Point Tubing
Replacing Link A
1-2
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Replacing Link B
Remote Set Point (suffix letter M)
5-1
Maintenance Calibration
5-1
Precalibration Procedures
5-1
Aligning the Flexures
5-1
Setting the Travel Stops
5-5
Aligning the Linkage
5-5
Remote Set Point Zero and Span
5-6
Adjustment
5-6
Remote Set Point Linearity Adjustment
Auto/Manual Station (suffix letter E)
Maintenance
5-6
Replacing the Auto/Manual Station
Replacing the Switch Body Assembly,
Lever O-ring, Switch Body O-ring
5-6
and Tubing Assembly
Replacing the Loader Range Spring,
5-10
Diaphragm Assembly, Ball Seat,
Tubing, and Ball
5-13
Replacing the Loader Valve Plug and
Valve Plug Spring
5-15
6. Parts
5-15
Parts Ordering
5-16 Parts Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Abbreviations Used in the Parts List
5-16 Controller Common Parts
5-17 Process and Set Point Indicator
5-17 Assembly
5-17 Capsular Element Assembly
5-18 Indicator Assembly
5-18 Type 83U Relay
5-19 Remote Set Point Assembly
(suffix letter M)
5-20 Auto/Manual Station (suffix letter E)
5-20 Internal and External Set Point
5-21 Assembly (Option)
5-21 Controller Mounting Parts
5-22 Pipestand Mounting
5-22 Pipestand Mounting with Regulator
5-22 Panel Mounting
5-22 Wall Mounting
5-22 Controller Mounting Parts for Actuator
5-22 With Casing-Mounted Controller
5-23 Controller Mounting Parts for Actuator
With Yoke-Mounted Controller
5-25 Regulator Mounting Parts
Regulator Mounting Parts for
5-25 Casing-Mounted Regulator
Regulator Mounting Parts for
5-26 Yoke-Mounted Regulator (Mounting
5-26 Bracket Not Required)
5-27 Regulator Mounting Parts for
5-27 Yoke-Mounted Regulator
5-28 (With Mounting Bracket)
5-28 Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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5-28
5-28
5-28
5-28
5-29
5-29
5-29
. . . . 5-30
5-30
5-30
5-31
5-32
5-32
6-1
6-1
6-1
6-1
6-1
6-4
6-4
6-4
6-4
6-5
6-5
6-5
6-6
6-6
. . . . . . . 6-6
6-6
6-6
6-6
6-6
6-7
6-7
6-7
6-7
6-7