Page 1
Instruction Manual
Form 1783
December 1997
Type 546, 546S, and 546NS
Typ
e 5
46
, 5
46S
, and 5
T ransducers
Contents
Introduction
Scope of Manual 1.
Description 1
Specifications 2
Installation
Mounting 2
Pressure Connections 4.
Diagnostic Connections 4.
Electrical Connections 4.
Operating Information
Adjustments 6
Calibration 6
Equipment Required 6.
Calibration Procedure 6.
Recalibration 7
Changing Output Pressure Range 7.
Reversing the Action 7.
Split Range Operation 7.
Principle of Operation
Maintenance
Troubleshooting 9
Electrical 9
Pneumatic 10
Alignment 10
Span Adjustment 10.
Torque Motor Frame 11.
Armature Travel Stop 11.
Coil 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Type 82 Relay Removal and Replacement 11.
Type 82 Relay Maintenance 11.
Replacing the Feedback Bellows Assembly 12.
Parts Ordering
Parts List
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46N
1.
2
5.
8.
9
12.
12.
S E
lectro-Pneumatic
Repair Kits for Type 546, 546S,
and 546NS Transducers 12.
Type 546, 546S, & 546NS Transducers 13.
Torque Motor 13.
Type 82 Relay 14.
Diagnostic Connections 15.
Mounting Parts 15.
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Loop Schematics
CSA Schematics 17.
FM Schematics 19.
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Introduction
Scope of Manual
This instruction manual provides installation, operation, maintenance, and parts ordering information for
the Type 546, 546S, and 546NS transducers and
Type 82 relay. Refer to separate manuals for instructions covering equipment used with the transducer.
Only personnel qualified through training or experience
should install, operate, and maintain this transducer. If
there are any questions concerning these instructions,
contact your Fisher Controls sales office or sales representative before proceeding.
Description
The Type 546 or 546NS transducer (figure 1) receives
either a voltage (Vdc) or a current (mAdc) input signal
and transmits a proportional pneumatic output pressure to a final control element. The Type 546S trans-
ducer receives a current (mAdc) input signal and
transmits a proportional pneumatic output pressure. A
typical application is in electronic control loops where
the final control element, generally a control valve, is
pneumatically operated. The input signal, output pressure range, and electrical classification, if approved, of
each transducer is indicated on the nameplate attached to the cover (figure 2).
17.
D200108X012
Page 2
Type 546, 546S, and 546NS
TYPE 546
Figure 1. T
W2115/IL
ype 546 Mounted on a T
Diaphragm Actuator
FILTER
REGULATOR
ype 657 Pneumatic
The O-rings are EPDM (ethylene propylene) and the
diaphragms are EPDM/Nomex. EPDM
(1)
demonstrates superior temperature capability and shelf life
over nitrile. The Nomex diaphragm fabric demonstrates improved strength retention at elevated temperature and radiation conditions.
In addition, the Type 546NS transducer is qualified
“commercial grade dedicated” under Fisher’s
10CFR50, Appendix B, quality assurance program.
These can be supplied as 10CFR, Part 21 items.
Specifications
Specifications for the Type 546, 546S, and 546NS are
listed in table 1.
Installation
WARNING
INFORMATION IN THIS PORTION OF THE
NAMEPLATE IDENTIFIES THE HAZARDOUS
AREA CLASSIFICATION AND APPROVALS
11A0050-G SHT B
A3102-2 / IL
FOR THE PRODUCT SPECIFIED ON THE
EQUIPMENT ORDER.
Figure 2. T
ypical Nameplate
The Type 546S transducer is approved as being intrinsically safe when used with certain barrier systems.
Refer to the Loop Schematics section of this manual.
The Type 546NS transducer meets typical requirements of the nuclear power industry. The Type 546NS
construction includes materials that provide superior
performance in elevated temperature and radiation
environments.
If a flammable or hazardous gas is being
used as the supply pressure medium
and the transducer is in an enclosed
area, personal injury or property damage might result from fire or explosion
of accumulated gas. To avoid such injury or damage, provide adequate ventilation.
Mounting
When a Type 546, 546S, or 546NS transducer is ordered as part of a control valve assembly, the factory
mounts the transducer on the actuator and connects
the necessary tubing, then adjusts the transducer as
specified on the order.
Transducers also can be ordered separately for
mounting on a control valve assembly already in service. The transducer may be ordered with or without
mounting parts. Mounting parts include the appropriate
bracket and bolts for attaching the unit to an actuator
boss (with tapped holes) or for attaching it to the diaphragm casing. If preferred, mounting parts are available for mounting the transducer on a 2-inch (51 mm)
diameter pipestand, a flat surface, or a bulkhead.
Tubing is not included if the transducer is not factory
mounted. Use 3/8-inch (9.5 mm) outside diameter tubing for all supply and output connections. Tubing
length between the transducer output and the final
control element should be as short as possible to minimize its effect on control loop stability.
2
1. Use a clean, dry, oil-free air supply with instruments containing EPDM components. EPDM is subject to degradation when exposed to petroleum-based lubricants.
Page 3
Type 546, 546S, and 546NS
Table 1. Specifications
Available Configurations
Type 546: Electro-pneumatic signal transducer with
explosion-proof case and cover
Type 546S: Similar to Type 546 except designed
for intrinsically safe, non-incendive, or dust-ignition
Maximum Steady-State Air Consumption
At 20 psig (1.4 bar) Supply Pressure: 0.35 scfm
(0.6 normal m3/hr)
At 35 psig (2.4 bar) Supply Pressure: 0.50 scfm
(0.8 normal m3/hr)
applications
Type 546NS: Similar to Type 546 except provided
with EPDM elastomers for use in elevated temperature and radiation environments
All transducer types can be ordered with or without
a 67 Series filter regulator. A 2 inch (51 mm) circu-
Maximum Output Air Capacity
At 20 psig (1.4 bar) Supply Pressure: 8.0 scfm
(13.4 normal m3/hr)
At 35 psig (2.4 bar) Supply Pressure: 11.5 scfm
(19.3 normal m3/hr)
lar supply pressure gauge may be mounted on the
regulator
Input Signals
(1)
Type 546 and 546NS: 1 to 5 mAdc, 4 to 20 mAdc,
10 to 50 mAdc, 1 to 9 Vdc, or two-way split range
using any half of one of the standard input signal
spans
Type 546S: 4 to 20 mAdc, or For Factory
Mutual only, a two-way split range using either half
of the 16 mAdc span. Signal must not exceed 30
Vdc, 20 mAdc
Internal Resistance of Torque Motor
1 to 5 mAdc Input Signal: 2500 ±120 ohms (stan-
Performance
Actuator Loading Time: See figure 7
Reference Accuracy: ±0.75% of output signal
span
Independent Linearity:
span
Open Loop Gain:
Frequency Response:
at 20 Hz with transducer output signal piped to a
typical instrument bellows with 12 inches (305 mm)
of 1/4 inch tubing
Operative Ambient Temperature Limits
–40 to +150F (–40 to 66C)
(3)
(1)
26
dard) or 12,000 ±50 ohms (temperature-compensated circuit)
4 to 20 mAdc Input Signal: 176 ±10 ohms
10 to 50 mAdc Input Signal: 90 ±10 ohms
1 to 9 Vdc Input Signal: 1300 ±50 ohms (tempera-
ture-compensated circuit)
Electrical and Enclosure Classification
Refer to the Hazardous Area Classification bulletins
and the transducer nameplate (see figure 2)
Housing: NEMA 3R and CSA ENC 3 rating (NEMA
3R mounting orientation requires vent location to be
below horizontal. Vent is shown in figure 10, key 69)
(1)
(1)
3 to 15 psig (0.2 to 1.0 bar), 6
Adjustments
Zero and Span Adjustments: Screwdriver adjust-
ments located inside case (see figure 5)
Output Signals
Ranges:
For 546 and 546NS:
to 30 psig (0.4 to 2.0 bar), 3 to 27 psig (0.2 to 1.9
bar), 0 to 18 psig (0 to 1.2 bar), or 0 to 33 psig (0 to
2.3 bar)
For 546S:
3 to 15 psig (0.2 to 1.0 bar), 6 to 30 psig
(0.4 to 2.0 bar), 3 to 27 psig (0.2 to 1.9 bar), or 0 to
33 psig (0 to 2.3 bar)
Action: Type 546 and 546NS are field-reversible
between direct and reverse action. The Type 546S
is available with either direct or reverse action but
cannot be reversed in the field.
Supply Pressure
(1)
Recommended: 5 psig (0.3 bar) higher than upper
range limit of output signal
Maximum: 50 psig (3.5 bar)
1. These terms are defined in ISA Standard S51.1-1979.
2. Scfm—Standard cubic feet per minute (60F and 14.7 psia). Normal m3/hr—Normal cubic meters per hour (0C and 1.01325 bar absolute).
3. Performance values are obtained using a T
Ambient temperature is 73
near zero psig.
F (24
C). A transducer with other input or output signals might exceed these values. Reference accuracies of ±3.5% can be expected with output ranges starting
ype 546 or T
ype 546S transducer with a 4 to 20 mAdc input signal and a 3 to 15 psig (0.2 to 1 bar) or a 6 to 30 psig (0.4 to 2 bar) output signal.
Connections
Supply Pressure: 1/4-inch NPT female located on
side of case, (or located on the Type 67 AFR filterregulator if mounted)
Output Pressure: 1/4-inch NPT female located on
side of case
Vent: 1/4-inch NPT female with screen located on
relay
Electrical: 1/2-inch NPT female located on bottom
of case
Approximate Weight (Transducer Only)
9 pounds (4.1 kg)
(1,2)
(2)
(1)
±0.50% of output signal
(1)
Gain is attenuated 3 dB
(1)
3
Page 4
Type 546, 546S, and 546NS
PIPE NIPPLE (OUTPUT CONN)
PIPE TEE
PIPE
BUSHING
BODY
BODY
PROTECTOR
12B8041-B
A6072-1 / IL
Figure 3. Diagnostic Connections
Pressure Connections
Note
The supply source must be clean, dry,
oil-free,
unfailing pressure at least 5 psig (0.3
bar) higher than the upper limit of the
transducer output pressure range. This
means that for an output pressure range
of 3 to 15 psig (0.2 to 1.0 bar) the supply
pressure should be at least 20 psig (1.4
bar); for a 6 to 30 psig (0.4 to 2.0 bar)
range, the supply pressure should be at
least 35 psig (2.4 bar). The supply pressure to the filter regulator should not be
more than 250 psig (17.3 bar) at a maximum temperature of 150F (66C).
If specified, the filter regulator is mounted on the transducer case. A pressure gauge on the regulator shows
the supply pressure to the transducer.
(1)
non-corrosive air or gas at an
SUPPLY
GAUGE
STEM PROVIDED
WHEN GAUGE
IS SPECIFIED
bushing for the connector. The connector consists of
1/8-inch NPT body and body protector.
Note
If the transducer is used in a valve assembly with a positioner, no connections for diagnostic testing are required
for the transducer. Install the connections for diagnostic testing at the positioner.
Install the connectors and hardware between the
transducer and the actuator.
1. Before assembling the pipe nipple, pipe tee, pipe
bushings, actuator piping, and connector body, apply
sealant to all threads.
2. Turn the pipe tee to position the connector body
and body protector for easy access when doing diagnostic testing.
1. Connect a supply pressure source to the 1/4-inch
NPT IN connection on the filter regulator (if furnished)
or to the 1/4-inch NPT SUPPLY connection on the
transducer case (if a regulator is not furnished).
2. Run 3/8-inch (9.5 mm) outside diameter tubing
from the 1/4-inch NPT OUTPUT connection on the
transducer case to the input connection on the pneumatic actuator or valve positioner. This connection is
made at the factory if the unit is shipped mounted on
an actuator as shown in figure 1.
Diagnostic Connections
To support diagnostic testing of valve/actuator/positioner packages, special connectors and hardware are
available. Typical connector installations are shown in
figure 3. The hardware used includes a 1/4-inch NPT
pipe nipple and pipe tee with a 1/8-inch NPT pipe
4
Electrical Connections
WARNING
For explosion-proof applications, disconnect power before removing the
transducer cover.
For explosion-proof applications, install
rigid metal conduit and a conduit seal
no more than 18 inches (457 mm) from
the transducer. Personal injury or property damage may result from explosion
if the seal is not installed.
For intrinsically safe installations, refer
to factory drawings or to instructions
provided by the barrier manufacturer for
proper wiring and installation.
Page 5
Type 546, 546S, and 546NS
+
INPUT
–
DC SIGNAL: 1 TO 5 MILLIAMPS
+
INPUT
–
CP8401-B
B1766-2/IL
1
2500 OHMS
450 OHMS
500 OHMS
500 OHMS
THERMISTOR
DC SIGNAL: 1 TO 9 VOLTS
ADJUST RESISTANCE ACROSS INPUT
TERMINALS TO 1300 OHMS 1
+
INPUT
–
DC SIGNAL: 4 TO 20 MILLIAMPS
1
1010 OHMS
Figure 4. Typical Circuit Drawings
The electrical connections are made in the transducer
case. A 1/2-inch NPT conduit connection is provided in
the bottom of the case. Use a suitable conduit seal for
hazardous locations. The wires that carry the input
signal from the control device are connected to the
terminal mounting bracket assembly (key 53, figure 9).
+
INPUT
–
DC SIGNAL: 10 TO 50 MILLIAMPS
1
176 OHMS
NOTE:
DC RESISTANCE
OF COILS
+
INPUT
–
1
176 OHMS
INTRINSICALLY SAFE
DC SIGNAL: 4 TO 20 MILLIAMPS
Note
Use a lubricant (key 95, figure 8) on the
case-cover threads to prevent thread
damage.
1
90 OHMS
WARNING
To avoid personal injury or equipment
damage, do not reverse the action of a
Type 546S transducer in the field.
Diodes in the input circuit (see figure 4)
will short if a reversed input signal is
applied. If the diodes are shorted, they
are capable of producing a spark which
might ignite a hazardous atmosphere
causing a fire or explosion. A Type
546S transducer must be ordered from
the factory as either direct or reverse
acting.
For a direct-acting unit (i.e., increasing current produces an increasing output pressure), connect the
positive wire from the control device to the positive
terminal of the transducer and the negative wire to the
negative terminal. For a reverse-acting unit (i.e., increasing current produces a decreasing output pressure), connect the positive wire from the control device
to the negative terminal and the negative wire to the
positive terminal. Typical circuits are shown in figure 4.
Operating Information
WARNING
Personal injury or property damage may
result from fire or explosion if power is
applied to the transducer with the cover
removed in a hazardous area.
If the transducer is installed in an application where explosion-proof classification is required, perform the following
steps when any procedure in this section requires removal of the cover:
Disconnect the electrical signal
from the transducer.
Remove the transducer to a non-
hazardous area.
Perform procedures as described
in this section.
Reinstall the transducer, and ensure the cover is secured before turning
on the electrical signal.
For intrinsically safe areas, current monitoring during operation must be with a
meter approved for use in hazardous
areas.
5
Page 6
Type 546, 546S, and 546NS
ZERO ADJUSTMENT
W5391/IL
Figure
SPAN ADJUSTMENT
5. Zero and Span Adjustments (Cover Removed)
Adjustments
Adjust the filter regulator to provide the proper supply
pressure to the transducer, then adjust the transducer
span and zero (see figures 5 and 6) to match the application requirements and be within specifications.
The zero adjustment is used to set the output pressure
so that it corresponds to the proper value of the input
signal. For example, if the output range is 3 to 15 psig
(0.2 to 1.0 bar) and the input range is 1 to 5 mAdc and
the unit is direct-acting, use the zero adjustment to set
the output pressure at 3 psig (0.2 bar) when the input
signal is 1 mAdc. Use the span adjustment to set the
output pressure span so that full output pressure
change results for a full change in the input signal. In
this example, the output pressure change would be 12
psi (0.8 bar). Thus, the output pressure should start at
3 psig and increase to 15 psig (1.0 bar) as the input
signal is changed from 1 to 5 mAdc.
A span adjustment will affect the zero. Therefore, follow any span adjustment with a zero adjustment. Provide a suitable gauge to measure the pressure.
Calibration
Equipment Required
Choose a current or voltage source that is capable,
without switching ranges, of driving the transducer
through its entire input range. Switching ranges on a
current or voltage source will produce spikes or midscale reverses in the input signal presented to the
transducer, causing errors.
Calibration Procedure
er with a 4 to 20 mAdc input signal
range and a 3 to 15 psig (0.2 to 1.0 bar)
output range. Calibrate transducers with
other inputs and outputs in a similar
manner.
1. Check the supply pressure to ensure it agrees with
the minimum pressure on the transducer nameplate.
2. Adjust the input current to 4.00 mAdc.
3. Turn the zero screw until the output pressure is
3.00 ±0.09 psig (0.2 ±0.006 bar).
4. Adjust the input to 20.00 mAdc.
5. If the output pressure is less than 14.91 psig (1.028
bar), turn the span screw clockwise to increase the
span. If the output pressure is greater than 15.09 psig
(1.040 bar), turn the span screw counterclockwise to
decrease the span.
Note
Do not watch the output gauge while
turning the span screw because the
change in output is not a good indication of the change in span. While turning the span adjustment screw, the output pressure may move in the opposite
direction than expected. For example,
while turning the span screw in the INCREASING SPAN direction, the output
pressure might decrease. This should
be disregarded since even though the
output pressure decreases, the output
span is increasing.
6. Repeat steps 2 through 5 until the output pressure
is within one-third of the accuracy limits at 4 and 20
mAdc. One-third of the accuracy limits for a 3 to 15
psig (0.2 to 1.0 bar) output range is 1/3 (±0.0075)
(15.00 – 3.00) = ±0.03 psig (±2 mbar). Calibrate for
maximum accuracy at the target end points [3.00 and
15.00 psig (0.20 and 1.00 bar)]. This allows for error at
other calibration points in between.
7. Run the transducer through three calibration cycles
before recording data. The cycles should be run from
exactly 4.00 to 20.00 mAdc in a slow ramping fashion
(no large step inputs).
8. After returning from 20.00 mAdc during the last
exercise cycle, move back upscale to the midpoint
(12.00 mAdc) and record the first data point. Table 2 is
an example of recorded data.
Note
The following calibration procedure is
for a Type 546, 546S, or 546NS transduc-
6
9. Record at the other calibration points desired by
moving upscale to 20.00 mAdc then down scale to
4.00 mAdc, then back upscale to 12.00 mAdc. Refer
to table 2 for common calibration points.
Page 7
Type 546, 546S, and 546NS
Table 2. Typical Calibration Data
TRANSDUCER INPUT ACTUAL OUTPUT PRESSURE TARGET OUTPUT PRESSURE
mA dc Psig Bar Psig Bar
12.00
16.00
20.00
16.00
12.00
8.00
4.00
8.00
12.00
8.89
11.95
15.02
12.02
8.96
6.00
3.01
5.95
8.97
0.612
0.823
1.035
0.828
0.617
0.413
0.207
0.409
0.618
9.00
12.00
15.00
12.00
9.00
6.00
3.00
6.00
9.00
0.620
0.826
1.033
0.826
0.620
0.413
0.206
0.413
0.620
Note
During the calibration cycle, use care to
avoid overshoot. In other words, if data
is to be recorded at an 8.00 mAdc input
while moving upscale and you accidently pass 8.00 to some higher value, run
the test again starting at step 7 with the
three exercise cycles.
Do not
reverse
direction and move down scale to 8.00
mAdc.
10. After completing the calibration cycle and recording data, verify that all data is within ±0.75% accuracy
limits. If not, the transducer may need to be recalibrated to move the end points slightly to bring the entire calibration curve within the accuracy limits.
Recalibration
Table 2 shows typical recorded data where recalibration is necessary.
The 8.89 psig (0.612 bar) value at 12.00 mAdc is outside the accuracy limit of ±0.09 from the target value.
This data point can be raised by recalibrating the
transducer and raising the end points enough to bring
this low value within –0.09 psig (–0.6 mbar) of 9.00
psig (0.62 bar). A reasonable recalibration would be
3.05 and 15.05 psig (0.21 and 1.04 bar) at 4.00 mAdc
and 20.00 mAdc, respectively. Recalibrate the instrument and recheck the calibration data as described in
steps 7 through 10.
If the transducer remains outside of accuracy specifications after altering the calibration end points as
much as possible, return the transducer to the factory
or consult your Fisher Controls sales office or sales
representative.
For transducers inaccurate to less than 5 percent of
output span, relay repair or replacement may correct
the problem. Refer to the alignment procedures in the
Troubleshooting section to correct the operation of a
faulty transducer. Also check for air leaks at the tubing, nozzle, relay, and bellows.
If the accuracy error is greater than 5 percent of output span, check the clearance between the armature
and the coils. These parts are referenced as key 40
and key 42, respectively, in the Parts List section. The
armature and the white plastic coil bobbin should be
approximately 1/64 inch (0.4 mm) apart. If the parts
are in contact, loosen the machine screws that hold
the bobbin and reposition the bobbin.
Changing Output Pressure Range
Changing the output pressure range from 3 to 15 psig
(0.2 to 1.0 bar) to 6 to 30 psig (0.4 to 2.0 bar) or vice
versa requires changing the feedback bellows (key 57,
figure 9). To do this, refer to the replacing the feedback bellows assembly procedures in the Maintenance
section.
Reversing the Action
Reversing the action of a Type 546 or 546NS transducer requires no special parts. The direction of armature rotation is dependent upon the direction of the
current flow. Therefore, simply reverse the input current leads to the transducer to obtain the opposite action. Whenever the action is changed, readjust the
zero of the transducer as outlined in the adjustments
procedures.
WARNING
To avoid personal injury or equipment
damage, do not reverse the action of a
Type 546S transducer in the field.
Diodes in the input circuit (see figure 4)
will short if a reversed input signal is
applied. If the diodes are shorted, they
are capable of producing a spark which
might ignite a hazardous atmosphere
causing a fire or explosion. A Type
546S transducer must be ordered from
the factory as either direct or reverse
acting.
Split Range Operation
Type 546, 546S, and 546NS transducers are suitable
for two-way split range operation. In a two-way split
7
Page 8
Type 546, 546S, and 546NS
,
Table
3. Feedback Bellows Output Pressure Range
OPERATION INPUT SIGNAL, DC
Full Half Quarter
Full Range 1 to 9 V
Split Range 4 to 12 mA or 12 to 20 mA
1. Temperature compensated circuit.
2. Not appropriate for split range applications because of the high resistance of 1 to 5 mA dc coils. If split range operation is desired, consult your Fisher Controls sales office or sales
representative.
(1)
1 to 5 mA
4 to 20 mA
10 to 50 mA
10 to 30 mA or 30 to 50 mA
1 to 5 Vdc or 5 to 9 Vdc
(2)
Psig Bar Psig Bar Psig Bar
3 to 15 0.2 to 1.0 6 to 30 0.4 to 2.0 – – – – – –
– – – – – – 3 to 15 0.2 to 1.0 6 to 30 0.4 to 2.0
BELLOWS SIZE
the milliampere (mA) or voltage output signal of a
single control device is split between two transducers
electrically connected in series. Although each transducer receives the full signal, it is calibrated to provide
a full output pressure range of 3 to 15 psig (0.2 to 1.0
bar) or 6 to 30 psig (0.4 to 2.0 bar) to the control valve
with one-half the input signal. Since the transducer
operates on only one-half of the normal input span, the
feedback bellows must be changed to compensate for
the shorter span. Change the bellows as described in
the replacing feedback bellows assembly procedure in
the Maintenance section. Table 3 indicates which bellows is required for your conditions. Reset the span
and zero adjustments to the split range values. Note
that these transducers cannot provide a three-way
split range.
Principle of Operation
Refer to the schematic drawing in figure 6. Assume
that the transducer is direct-acting. An increase in the
dc signal to the coils increases the magnetic field
around the coils. This field increases the magnetic
strength in the armature and the magnetic attraction
across the air gap between the armature and the pole
pieces.
The pole pieces are already polarized by the permanent magnet. The armature polarity is as shown in the
schematic. The magnetic attraction will therefore be
downward at the nozzle end and upward at the feedback bellows end, resulting in a torque that rotates the
armature about the fixed torsion rod to cover the
nozzle. The resulting restriction produces an increased
pressure in the nozzle, in the upper chamber of the
relay, and in the feedback bellows. The relay responds
to the increase in nozzle pressure to increase the output pressure to the actuator and control valve. The
increased pressure in the feedback bellows creates a
force that acts on the armature to move it back to an
equilibrium position. In this way, the new nozzle pressure is compared to the input current by the force-balance principle.
SPAN ADJUSTMENT
(MAGNETIC SHUNT)
ZERO ADJUSTMENT
PERMANENT
MAGNET
ARMATURE
NOZZLE
OUTPUT PRESSURE
NOZZLE PRESSURE
SUPPLY PRESSURE
EXHAUST PRESSURE
CENTER SPACER
ASSEMBLY
FIXED
RESTRICTION
POLE
PIECES
CP4285–A
A1505–3 / IL
FEEDBACK
BELLOWS
COIL
ARMATURE
TORSION ROD
EXHAUST
OUTPUT
RELAY
VALVE PLUG
SUPPLY
Figure 6. Transducer Schematic
The relay operates in the following manner. The
nozzle pressure acts on the large top diaphragm to
force the center spacer assembly (mounted between
the two diaphragms) downward against the valve plug,
closing the exhaust port and opening the supply port.
Supply air then flows through the open port to the output load. The output pressure continues to increase
until the relay diaphragm assembly is pushed back to
its original position by the force of the pressure acting
on the small diaphragm. When this occurs, the valve
plug is closed again.
When a decreasing dc signal is received, the magnetic
attraction across the air gap is reduced. The armature
rotates to uncover the nozzle and decrease the pressure in the nozzle, relay, and feedback bellows. The
relay diaphragm assembly moves upward, and the
exhaust port opens to bleed the output pressure to
atmosphere.
8
Page 9
Type 546, 546S, and 546NS
100
90
80
70
60
50
OUTPUT
40
30
20
(% OF TYPE 546 OUTPUT SPAN)
10
0
19A1361-A
A3103 / IL
Figure
0 102030405060708090100
7. Output-Time Relationship for T
LOADING
546NS T
EXHAUSTING
TIME
ransducers
(%)
ype 546, 546S, and
The output decreases until the diaphragm assembly is
forced back to its original position and the exhaust port
is closed again. The reduced pressure in the feedback
bellows diminishes the force to return the armature to
the equilibrium position.
Figure 7 shows output-time relationship curves for
loading and exhausting an actuator. Exhausting times
are nominally 25 percent of the loading times.
Reverse-acting transducers operate in a similar manner except that when the dc input signal increases, the
output pressure from the relay decreases. Conversely,
a decreasing input signal increases the output pressure.
Maintenance
WARNING
For explosion proof applications, disconnect power before opening the
transducer cover. Personal injury or
property damage may result if power is
not disconnected.
components may void the third-party
approval. Also, always use proper component replacement techniques, as
presented in this manual. Improper
techniques can cause poor quality repairs and impair the safety features of
the device.
Maintenance of the transducer consists of relay repair
or replacement, and replacement of the feedback bellows. These procedures are described at the end of
this section. Due to the care Fisher Controls takes in
meeting all manufacturing requirements (heat treating,
dimensional tolerance, etc.), use only replacement
parts manufactured or furnished by Fisher Controls
International.
Figure 9 shows the torque motor and associated parts.
Shaded key numbers indicate parts that should not be
disassembled from the torque motor because the
magnetism in the torque motor magnets will decrease
permanently.
Certain troubleshooting and alignment procedures are
described in the following steps. These may serve as
a guide to correct some problems. Improper supply
pressure and mechanical defects in pneumatic and
electrical connections should be apparent upon inspection and repaired as appropriate.
CAUTION
Never disassemble the torque motor assembly because the magnetism in the
torque motor magnets will decrease permanently. Shaded key numbers indicate
parts that should not be disassembled
from the torque motor (see figure 9). If
troubleshooting or alignment attempts
indicate either a faulty torque motor or
the necessity of disassembling the
torque motor, return the entire transducer to the factory, or consult your Fisher
Controls sales office or sales representative.
CAUTION
The presence of Fisher Controls personnel and also approval agency personnel
may be required if you service (other
than normal, routine maintenance, such
as calibration) or replace components
on a transducer that carries a third-party
approval. When you replace components, use only components specified
by the factory. Substitution with other
Troubleshooting
This section contains some checks for operational difficulties that may be encountered. If correcting the difficulties is not possible, contact your Fisher Controls
sales office, service center, or sales representative.
Electrical
1. Check the output of the control device. Make sure
that it is reaching the transducer.
2. Check the dc input signal. It should be the same as
the range stamped on the transducer nameplate.
9
Page 10
Type 546, 546S, and 546NS
3. Check the resistance of the transducer circuit to
see that it coincides with the value listed on the circuit
identification tag located on the torque motor.
4. Check the terminal lugs for proper connections. If
reverse action of the transducer is observed, simply
reverse the input leads as indicated in the Reversing
the Action procedures in the Operating Information
section.
Pneumatic
CAUTION
Do not attempt to remove the nozzle
(key 19, figure 9) for any reason. Nozzle
removal requires disassembling the
torque motor. Disassembling the torque
motor will permanently reduce the
strength of the magnets, causing improper operation. Also, do not adjust
the baffle (key 18, figure 9). The spacing
between the baffle and nozzle is preset
and locked at the factory to obtain optimum performance of the transducer.
1. Connect supply pressure and a pressure gauge to
monitor the output. Check the operation of the transducer as follows:
a. Force the baffle (key 18, figure 9) against the
nozzle. The output pressure should build up to
approximately the supply pressure. If it does not,
check for a leak in the pneumatic system or a burr
on the nozzle.
b. Force the baffle away from the nozzle. The output pressure should drop to less than 1 psig (0.07
bar). If it does not, check the flame arrestors in the
transducer case (see figure 8). If the flame arrestors require cleaning, first remove the torque motor
assembly from the case by removing four machine
screws (key 9, figure 8). Then, clean the flame arrestors by blowing them out with air pressure.
6. Check the nozzle. If it is clogged, remove the entire
torque motor assembly from the case by removing
four machine screws (key 9, figure 8). Run a wire
through the nozzle from the underside of the assembly.
7. Erratic operation may be caused by metal chips in
the air gap between the armature and the pole pieces.
Blow any chips out of the torque motor assembly with
low pressure air.
8. If a problem persists, check the relay as described
in the Type 82 Relay Maintenance procedures in this
section.
Alignment
The following alignment procedures can be used in
conjunction with troubleshooting procedures to correct
the operation of a faulty transducer.
Span Adjustment
Refer to figure 9 for key number locations, unless
otherwise directed.
If setting the required span is not possible, additional
span adjustment can be obtained by shifting the entire
span adjustment assembly (key 55) at the flexure pivot
end. The alignment procedure is as follows:
1. Shut off the dc input signal and supply pressure to
the transducer.
2. Disconnect the external lead wires from the terminal mounting bracket assembly (key 53).
3. Loosen the four machine screws (key 9, figure 8)
that hold the torque motor assembly to the case. Remove the entire torque motor assembly from the case.
4. Loosen the two flexure pivot screws (key 25) that
hold the flexure pivot to the torque motor assembly
base.
2. Check zero and span adjustment for proper setting.
Refer to the adjustments procedure.
3. Check the supply pressure. It should be at least 5
psig (0.3 bar) above the upper limit of the output pressure range.
4. Check the filter regulator for moisture in the dripwell. Drain off any moisture, and clean the filter element if necessary.
5. If the transducer cycles, be sure there are no sharp
bends in the copper capillary feedback tubing (key 56,
figure 9) and that the tubing is not plugged.
10
5. Slide the span adjustment assembly in or out as
required. Sliding it in toward the base decreases the
span; sliding it out away from the base increases the
span.
6. Tighten the flexure pivot screws. Replace the
torque motor assembly, and tighten the screws (key 9,
figure 8). Make sure that the O-ring (key 37) is in
place. Connect the external lead wires, and turn on the
air supply.
7. Make final adjustment of the span with the span
adjustment screw.
Page 11
Type 546, 546S, and 546NS
Torque Motor Frame
The top pole piece plate (key 50, figure 9) of the
torque motor can become twisted with respect to the
bottom pole piece plate (key 51, figure 9). If this happens, return the transducer to the factory, service center, or contact your Fisher Controls sales office or
sales representative.
Armature Travel Stop
The armature travel stop (key 52, figure 9) must be in
place to prevent overstressing the armature and coil
support (key 41, figure 9) due to over-travel. The
clearance between the armature and travel stop
should be 0.005 inches (0.13 mm).
The two screws at the base of the travel stop can be
loosened if an alignment is necessary.
Coil
The coil assembly (key 42, figure 9) consists of a nylon bobbin wound with wire. The coils are not attached
to the armature itself, and therefore, they must not
touch the armature, or armature movements will be
restricted. If this problem exists, loosen the two
screws that attach each coil assembly to the armature
and coil support. Sight down the armature and realign
the coil assemblies for clearance with the armature.
Tighten the screws.
WARNING
The following maintenance procedures
require that the transducer be taken out
of service. This requires that certain precautions be taken to avoid personal injury or equipment damage caused by
sudden release of pressure or explosion
of accumulated gas. Prior to maintenance:
Disconnect electrical power before
removing the transducer cover (especially in explosion proof or hazardous
applications).
Shut off or disconnect pressure
lines to the transducer.
Disconnect any operating lines providing air pressure, electrical power, or
a control signal to the actuator. Be sure
the actuator cannot suddenly open or
close the valve.
Use bypass valves or completely
shut off the process to isolate the valve
from process pressure. Relieve process
pressure on both sides of the valve.
Drain the process media from both
sides of the valve.
Vent the power actuator loading
pressure and relieve any actuator spring
precompression.
Use lock-out procedures to be sure
that the above measures stay in effect
while you work on the equipment.
Type 82 Relay Removal and
Replacement
Use the following procedure when removing and replacing a relay assembly. Refer to figure 10 for key
number locations, unless otherwise directed.
1. Loosen the two mounting screws (key 68), and remove the relay assembly from the transducer case
(key 1, figure 8).
2. To install the replacement relay assembly, install
the two relay mounting screws (key 68) into the relay
assembly. Apply lubricant (key 96) to the O-rings, and
make sure the O-rings (keys 72, 73, and 74) are in
place on the relay assembly.
3. Install the relay assembly on the transducer case.
Tighten the mounting screws.
4. With the torque motor installed, apply supply pressure to the transducer case, and check the relay assembly for leaks with a soap solution.
Type 82 Relay Maintenance
Use the procedure below to repair the relay assembly.
Refer to figure 10 for key number locations.
Obtain the relay repair kit listed in the parts list. This
kit provides the parts, alignment tool, and an instruction sheet used when repairing the relay assembly.
1. Remove the two screws (key 77), valve plug spring
seat (key 64), valve plug spring (key 70) and valve
plug (key 63).
2. Remove the six screws (key 76, not shown) and
separate the relay body (key 60), casing spacer (key
61), and relay casing (key 62) by inserting a screwdriver between the external casting lugs. Twist the screwdriver to separate parts.
3. Remove the upper diaphragm (key 66), lower diaphragm assembly (key 65), and relay spring (key 71).
Clean and inspect relay parts before replacing them.
4. Remove the restriction assembly (key 67) and replace the O-rings (keys 74 and 75). Apply lubricant
(key 96) to the O-rings before installing the restriction
assembly into the relay body.
11
Page 12
Type 546, 546S, and 546NS
5. The restriction hole (see figure 10) in the restriction
assembly is 0.016 inches (0.41 mm) in diameter.
Clean the hole with solvent and blow dry with compressed air. If the hole is plugged, insert a wire in the
hole. Then, clean with solvent and blow dry with compressed air. Do not enlarge the hole. Reinstall the restriction assembly in the relay body. Do not overtighten.
6. The restriction hole in the relay body is 0.020 inches (0.51 mm) in diameter. If the hole is plugged,
insert a wire into the hole and clean it out. Do not enlarge the hole.
7. Insert the new lower diaphragm assembly through
the casing spacer, replace the relay spring, and position the parts on the relay body. Position the new upper diaphragm on the relay casing and position the
relay casing on the upper diaphragm. Ensure that the
exterior casting lugs on the relay body, casing spacer,
and relay casing are aligned.
8. Invert the relay and install the six screws (key 76),
but do not tighten.
9. Insert the alignment tool through the brass supply
seat in the relay body, and into the exhaust seat of the
lower diaphragm assembly to align the parts.
10. Ensure the diaphragms are flat between the relay
body, casing spacer, and relay casing. Tighten the six
screws (key 76).
11. Remove the alignment tool, and reassemble the
valve plug, valve plug spring, valve plug spring seat
and the two screws (key 77).
12. Install the two relay mounting screws (key 68) into
the relay assembly. Apply lubricant (key 96) to the Orings, and make sure the O-rings (keys 72, 73, and
74) are in place on the relay assembly.
4. Inspect and, if necessary, replace the two O-rings
(key 36). Make sure the O-rings under the bellows assembly are in place.
5. Choose the correct bellows assembly as outlined in
table 3. Install the new bellows assembly. Make sure
that the O-ring (key 36) is in place.
6. Install the bellows screw and O-ring, and tighten
the screw. Be sure the bellows assembly is not distorted in any direction. Tighten the hex nut (key 31).
7. Refer to the adjusting zero and span procedures in
the Adjustments section.
Parts Ordering
Whenever corresponding with the sales office or sales
representative about this equipment, mention the serial number of the unit. This serial number can be found
on the nameplate (figure 2). When ordering replacement parts, also state the complete 11-character part
number of each part needed as found in the following
parts list.
Note
In the torque motor assembly drawing
(figure 9), there are many shaded key
numbers. The shading indicates that
these parts should not be disassembled
and that they are not available as individual items. Consequently, no part
numbers are shown for these parts in
the list below.
13. Install the relay assembly on the transducer case.
Tighten the mounting screws.
14. With the torque motor installed, apply supply pressure to the transducer case, and check the relay assembly for leaks with a soap solution.
Replacing the Feedback Bellows
Assembly
Refer to figure 9 for key number locations.
1. Loosen the hex nut (key 31).
2. Remove the bellows screw (key 56) and O-ring
(key 36) under the head of the bellows screw.
3. Pull the bellows assembly (key 57) out. The armature is slotted to allow removal of the bellows assembly.
12
Parts
List
Repair Kits for Type 546, 546S, and
546NS Transducers
Description Part Number
Type 546 and 546S Transducer Repair Kit
Kit includes keys 6, 12, 36, 37, and 58 R546X000022
Type 546NS Transducer Repair Kit
Kit includes keys 6, 12, 36, 37, and 58 R546X000032
Type 82 Relay Repair Kit
(for Type 546 and 546S only)
This kit includes keys 63, 65, 66, 69, 70, 72,
73, 74, 75. Kit also includes instruction sheet
and alignment tool R82X0000022
Type 82 Relay Replacement Assembly
(for Type 546 and 546S) Assembly includes
two mounting screws (Key 68) 10A8593X082
Type 82 Relay Replacement Assembly
(for Type 546NS) Assembly includes
two mounting screws (key 68) 10A8593X142
Page 13
Type 546, 546S, and 546NS
67 SERIES FILTER REGULATOR
APPLY LUBRICANT/SEALANT
NOTE: KEY 4 NOT WHOWN
30A8595-L
B1768-3 / IL
Figure 8. T
ype 546 T
Key Description Part Number
Type 546, 546S, & 546NS Transducers
(figure 8)
1 Transducer Case Ass’y, aluminum 1P4210000A2
2 Case Cover, aluminum 3P4213000A2
3 Protective Plug, plastic 1M3590X0012
4 Tagging Plate (optional)
Stainless steel (SST) 13B6776X012
5 Nameplate, Standard, SST
6* O-Ring
For Type 546 and 546S, nitrile 1D444806992
For Type 546NS, EPDM Duro 80A 14B7744X012
8* Pressure Gauge
Triple scale
0–30 psig/0–.2 MPa/0–2 bar 11B8582X012
0–60 psig/0–.4 MPa/0–4 bar 11B8582X022
Dual scale
0–30 psig/0–2 Kg/cm
0–60 psig/0–4 Kg/cm
9 Machine Screw, brass pl (4 req’d) 17B0404X012
10 Screw, steel pl 1P426928982
11 Cap Screw, steel pl (2 req’d) use with
integrally mounted filter regulator only 1C197024052
12* O-Ring, use with integrally mounted
filter regulator only
For Type 546 and 546S, nitrile 1E591406992
For Type 546NS, EPDM Duro 80A 14B7748X012
13 Pipe Nipple, steel pl,
For filter regulator only (not shown) 1C678926232
92 Wire Retainer, steel pl (2 req’d) 17B7757X012
95 Lubricant,
For 546 and 546S use Lubriplate Mag 1
(not furnished with unit)
For 546NS use Molykote 33
(not furnished with unit)
2
2
11B8582X042
11B8579X072
TORQUE MOTOR
FLAME ARRESTOR
TYPE 82 RELAY
FLAME
ARRESTOR
ransducer Assembly
Key Description Part Number
96 Lubricant, Molykote 33
(not furnished with unit)
106 Protective plug, polyethlene (2 req’d) 1E878406992
107 Street Elbow, use with integrally mounted filter
regulator w/0–60 dual scale gauge 1A913221992
108 Pipe Plug, steel
For regulator w/o gauge 1A767524662
Torque Motor (figure 9)
(2)
15
Adjusting Screw – – –
(2)
16
Spring Seat – – –
(2)
17
Spring-Zero Adjustment
For Type 546 & 546S, – – –
For Type 546NS, SST – – –
(2)
18
Baffle – – –
(2)
19
Nozzle – – –
(2)
20
Hook-Up Wire Ass’y – – –
(2)
21
Hook-Up Wire Ass’y – – –
(2)
22
Hook-Up Wire (not shown) – – –
(2)
25
Machine Screw – – –
(2)
26
Cap Screw – – –
(2)
27
Cap Screw – – –
(2)
28
Machine Screw – – –
(2)
29
O-Ring
For Type 546 & 546S, nitrile – – –
For Type 546NS, EPDM Duro 80A – – –
31 Hex Nut, brass pl 1N107318992
(2)
32
Washer – – –
33 Washer, brass pl 1P425315052
(2)
34
Washer – – –
(2)
35
Washer – – –
36*
O-Ring (2 req’d)
For Type 546 and 546S, nitrile 1D687506992
For Type 546NS, EPDM Duro 80A 14B7743X012
*Recommended spare parts
2. Parts are not field repairable. The torque motor assembly should never be disassembled because the magnetism in the torque motor will decrease permanently.
Shaded key numbers shown in figure 9 indicate parts that should not be disassembled.
13
Page 14
Type 546, 546S, and 546NS
30A8594-K
B1767-3
Figure 9. Torque Motor Assembly
Key Description Part Number
37* O-Ring
For Type 546 and 546S, nitrile 1C782206992
For Type 546NS, EPDM Duro 80A 14B7747X012
(2)
38
E-Ring – – –
(2)
40
Armature – – –
(2)
41
Coil Support – – –
(2)
42
Coil Ass’y – – –
(2)
48
Magnet – – –
(2)
49
Pole Piece – – –
(2)
50
Top Pole Piece Plate – – –
(2)
51
Bottom Pole Piece Plate – – –
(2)
52
Travel Stop – – –
(2)
53
Terminal Mounting Bracket Ass’y – – –
(2)
55
Span Adjustment Ass’y
56 Bellows Screw, brass 12B2577X012
57* Bellows Ass’y, brass
Full Size, 27/32 inch (21 mm) O.D. 1U3958000A2
Half Size, 1/2 inch (13 mm) O.D. 1U3975000A2
Quarter Size, 3/8 inch (9.5 mm) O.D. 1R6521000A2
58 Tubing Ass’y, brass/copper 1P4242000A2
94 Sealant, Zink Plate 770
(not furnished with unit)
96 Lubricant, Molykote 33
(not furnished with unit)
103 Set Screw, SST/nylon (not shown) 11B2218X012
(2)
105
Spacer – – –
(3)
– – –
Key Description Part Number
Type 82 Relay (figure 10)
Note
The following parts are for repairing the Type
546 and 546S relays only. The Type 546NS relay
is not repairable. If the relay is defective, order a
Type 82 Relay Replacement Assembly for a Type
546NS transducer.
60 Relay Body, aluminum/brass 3P4192X0022
61 Casing Spacer, aluminum 2P419347052
62 Relay Casing, aluminum 2P419447052
63* Valve Plug, brass 1P419514012
64 Spring Seat, brass 1P419615102
65* Lower Diaphragm Ass’y 1P4197X0032
66* Upper Diaphragm, nitrile 26A5657X012
67 Restriction Ass’y 1U8160X0012
68 Relay Mounting Screw, steel pl (2 req’d) 1P420324102
69* Screen, Monel 0L078343062
70* Valve Plug Spring, SST 1P420437022
71 Relay Spring, steel pl 15A3181X012
72* O-Ring nitrile 1P420606992
73* O-Ring, nitrile (2 req’d) 1P420706992
74* O-Ring, nitrile (2 req’d) 1D687506992
75* O-Ring, nitrile 1D134606992
14
*Recommended spare parts
3. The span adjustment assembly for the Type 546NS uses a bronze passive
lock, rather than nylon, and a locking hex nut.
Page 15
A1504-1 / IL
Figure
10. T
ype 82 Relay
Type 546, 546S, and 546NS
.
Key Description Part Number
76 Machine Screw, steel pl (6 req’d)
(not shown) 10B6513X012
77 Machine Screw, steel pl (2 req’d) 59061140X22
96 Lubricant, Molykote 33
(not furnished with unit)
Diagnostic Connections
FlowScanner diagnostic system hook-up
Includes pipe tee, pipe nipple, pipe bushings,
connector body, and body protector. See figure 3
for part identification. Also, part number provides
correct quantities of each item.
Note
If the transducer is used in a valve assembly
with a positioner, no hook-up for diagnostic testing is required for the transducer. The hook-up
for diagnostic testing should be installed at the
positioner.
For units with gauges
SST fittings 12B8041X012
Brass fittings 12B8041X022
For units without gauges
SST fittings 12B8041X032
Brass fittings 12B8041X042
Mounting Parts (figures 11 & 12)
79 Elbow, brass
Yoke mounting,
Types 513, 657, 1051, 1052, 1061
all sizes 15A6002X162
Yoke mounting (2 req’d)
Type 470, 480, 585, 585C, 667
all sizes 15A6002X162
48A9176-B
A5425-1 / IL
Figure 1
1. T
ypical Actuator Mounting
Key Description Part Number
79 Elbow, brass (cont”d)
Yoke mounting,
Types 513, 657, 1051, 1052, 1061
all sizes 15A6002X162
Casing mounting
Type 1250, 657, 667 1051, 1052
80 Connector, brass
81 Mounting Plate, steel
all sizes 15A6002X162
Yoke mounting
Type 513, 657, 1051, 1052, 1061
all sizes 15A6002X202
Casing mounting
1250, 657, 667, 1051, 1052 15A6002X202
Yoke mounting
Type 470, 480, 513, 585, 585C 656,
657, 667, all sizes
Type 1051 size 33 all positions,
size 40 and 60 position 1,
Type 1052 size 33 all positions,
sizes 40 thru 70 position 1
Type 1061 size 30 all positions,
sizes 40 thru 100 position 1 3P426825022
Type 1250 and 1250R 30B1265X022
Type 1051 size 40 and 60 position 3
Type 1052 sizes 40 thru 70 position 3
Type 1061 sizes 40 thru 100 position 3 2R1552X0022
Type 657, 657NS, 667, 667NS, all sizes
for seismic mounting of 546NS 35A4153X012
15
Page 16
Type 546, 546S, and 546NS
42B0737-A
A5426-1 / IL
Figure
12. T
ypical Casing Mounting
Key Description Part Number
81 Mounting Plate, steel (cont’d)
Casing mounting
Type 657 & 667, all sizes except size 80
Type 1051, 1052, all sizes, all positions 1F401225072
Pipestand mounting 3P426825022
Surface mounting 2R100125022
Bulkhead mounting 22A7618X012
82 Cap Screw, steel pl
Yoke mounting (4 req’d)
Type 470 size 23 thru 40, 63 & 64
Type 480 all sizes
Type 513 all sizes
Type 656 size 40 thru 60
Type 657 & 667 size 30 thru 80
Type 1051 size 40 & 60 all positions
Type 1052 sizes 40 thru 70 all positions
Type 1061 all sizes all positions 1A381624052
Yoke mounting (2 req’d)
Type 470, size 60 thru 130, except 63 & 64
Type 585, sizes 25 & 50
Type 585C, all sizes
Type 656, size 30
Type 657NS & 667NS, sizes 70 & 80
Type 1250 & 1250R
Type 1051 size 33 all positions
Type 1052 size 33 all positions 1A381624052
Casing mounting (2 req’d)
All types, all sizes 1A381624052
Pipestand mounting (2 req’d) 1A381624052
Surface mounting (2 req’d) 1N789132992
Bulkhead mounting (2 req’d) 1A381624052
Key Description Part Number
83 Cap Screw
Casing mounting (2 req’d)
85 Washer, steel pl
86 Cap Screw, steel pl (2 req’d)
87 Spacer, steel (2 req’d)
88 Mounting Bracket, steel
89 Hex Nut, steel pl (2 req’d)
90 Pipe Clamp, steel pl
97 U-Bolt, steel pl (2 req’d)
98 Hex Nut, steel pl (4 req’d)
99 Lock washer, SST
101
Type 1051, 1052, all sizes, all positions 1A582824052
Yoke mounting (4 req’d)
All types, all sizes, except Type 1250 & 1250R
Casing mounting (2 req’d)
Pipestand mounting (4 req’d) 1B865928982
Yoke mounting Type 1250 & 1250R, none required
Yoke mounting
Type 470, Sizes 60 through 130
Type 490, all sizes
Type 657NS & 667NS, Sizes 70, 80
Type 1051 & 1052, size 33, positions 1 & 3 1C870224052
Type 480, all sizes 1C5958X0022
Type 585 & 585C, Sizes 25 & 50 1A352624052
Type 656, Size 30 1B989624052
Type 1051 & 1052, size 33, positions 2 & 4 1K747624052
Casing mounting
Type 657 & 667, Sizes 30 through 60 1A582824052
Type 657 & 667, Size 70 1A368324052
Yoke mounting
Type 470, Sizes 60 through 130
Type 490, all sizes
Type 657NS & 667NS, Sizes 70, 80 1K766824092
Type 656, Sizes 30 1R801924092
Type 585, Sizes 25 & 50 1F906724092
Type 1051 & 1052, size 33, positions 1 & 3 1V102624052
Type 1051 & 1052, size 33, positions 2 & 4 1L200624092
Surface mounting 18A1696X012
Yoke mounting
Type 480, all sizes 3L276725092
Yoke mounting
Type 480, all sizes 1A352724122
Pipestand mounting 1P427028982
Type 1250 & 1250R, all sizes 19A7930X012
Type 1250 & 1250R, all sizes 19A4838X022
Yoke mounting (4 req’d)
Type 585C, size 25 & 50 1C225728982
Type 1250 & 1250R, all sizes 10B6610X012
Yoke mounting (2 req’d)
Type 1051 & 1052, size 33, all positions 1C225728982
Washer (2 req’d)
Casing mounting
Type 1051, 1052, all sizes, all positions 1H723125072
16
Page 17
Loop Schematics
This section includes loop schematics required for wiring of intrinsically safe installations. If you have any
questions, contact your Fisher Controls sales representative or sales office.
CSA Schematics
Type 546, 546S, and 546NS
29A1594-H Sheet 1 of 2
17
Page 18
Type 546, 546S, and 546NS
CSA Schematics (Continued)
29A1594-H Sheet 2 of 2
18
Page 19
FM Schematics
Type 546, 546S, and 546NS
26A5936-H Sheet 1 of 2
19
Page 20
Type 546, 546S, and 546NS
26A5936-H Sheet 2 of 2
Fisher-Rosemount satisfies all obligations coming from legislation
to harmonise product requirements in the European Union.
Fisher, Fisher-Rosemount, and Managing The Process Better are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc.
All other marks are the property of their respective owners.
Fisher Controls International, Inc. 1977, 1997; All Rights Reserved
For information, contact Fisher Controls:
Marshalltown, Iowa 50158 USA
Cernay 68700 France
Sao Paulo 05424 Brazil
Singapore 128461
20
Printed in U.S.A.
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