Fisher C1P, C1B, C1D Instruction Manual

Instruction Manual

D103292X012
September 2009

C1 Controllers and Transmitters

FisherR C1 Series Pneumatic Controllers and
Transmitters

Contents

Introduction 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Scope of Manual 2. . . . . . . . . . . . . . . . . . . . . . . . . .

Description 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Educational Services 2. . . . . . . . . . . . . . . . . . . . . .

Installation 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Standard Installation 2. . . . . . . . . . . . . . . . . . . . . .

Panel Mounting 6. . . . . . . . . . . . . . . . . . . . . . . . . . .

Wall Mounting 6. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pipestand Mounting 6. . . . . . . . . . . . . . . . . . . . . . .

Actuator Mounting 6. . . . . . . . . . . . . . . . . . . . . . . .

Pressure Connections 6. . . . . . . . . . . . . . . . . . . . .

Supply Pressure 6. . . . . . . . . . . . . . . . . . . . . . . . .

Process Pressure 8. . . . . . . . . . . . . . . . . . . . . . . .

Vent Assembly 8. . . . . . . . . . . . . . . . . . . . . . . . . . .

Controller Operation 9. . . . . . . . . . . . . . . . . . . . . . . .

Proportional−Only Controllers 9. . . . . . . . . . . . . .

Adjustments 9. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment: Set Point 9. . . . . . . . . . . . . . . . . .

Adjustment: Proportional Band 9. . . . . . . . . .

Calibration: Proportional−Only Controllers 10. .

Startup: Proportional−Only Controllers 12. . . . .

Proportional−Plus−Reset Controller 13. . . . . . . .

Adjustments 13. . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment: Set Point 13. . . . . . . . . . . . . . . . .

Adjustment: Proportional Band 13. . . . . . . . .

Adjustment: Reset 13. . . . . . . . . . . . . . . . . . . .

Adjustment: Anti−Reset Windup 14. . . . . . . .

Calibration 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration: Proportional−Plus−Reset

Controllers 14. . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration: Anti−Reset Windup 16. . . . . . . . .

Startup: Proportional−Plus−Reset

Controllers 16. . . . . . . . . . . . . . . . . . . . . . . . . .

Differential Gap Controllers 16. . . . . . . . . . . . . . .

Adjustments 16. . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment: Set Point 16. . . . . . . . . . . . . . . . .

Adjustment: Proportional Band 17. . . . . . . . .

Calibration: Differential Gap Controllers 17. . . .

Startup: Differential Gap Controllers 19. . . . . . .

Transmitter Operation 19. . . . . . . . . . . . . . . . . . . . .

Adjustments 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment: Zero 19. . . . . . . . . . . . . . . . . . . . . . .

Adjustment: Span 19. . . . . . . . . . . . . . . . . . . . . . .

W9263−1

Figure 1. Fisher C1 Controller Yoke−Mounted on Control

Valve Actuator

Calibration: Transmitters 19. . . . . . . . . . . . . . . . . .

Startup: Transmitters 20. . . . . . . . . . . . . . . . . . . . .

Principle of Operation 21. . . . . . . . . . . . . . . . . . . . . .

Proportional−Only Controllers 21. . . . . . . . . . . . .

Proportional−Plus−Reset Controllers 22. . . . . . .

Controllers with Anti−Reset Windup 22. . . . . . . .

Differential Gap Controllers 23. . . . . . . . . . . . . . .

Transmitters 23. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replacing Gauges 24. . . . . . . . . . . . . . . . . . . . . . .

Replacing Bourdon Tube 24. . . . . . . . . . . . . . . . .

Replacing Bellows Sensing Element 26. . . . . . . .

Changing Proportional or Reset Valve 27. . . . . .

Changing Anti−Reset Windup Differential

Relief Valve 27. . . . . . . . . . . . . . . . . . . . . . . . . .

Changing Action 27. . . . . . . . . . . . . . . . . . . . . . . . .

Proportional−Only to a Differential

Gap Controller 27. . . . . . . . . . . . . . . . . . . . . . .

Reverse to Direct Action 28. . . . . . . . . . . . . . . . .

Relay Replacement 29. . . . . . . . . . . . . . . . . . . . . .

Changing Output Signal Range 30. . . . . . . . . . . .

Parts Ordering 31. . . . . . . . . . . . . . . . . . . . . . . . . . . .

www.Fisher.com

Instruction Manual

C1 Controllers and Transmitters

Contents (Continued)

Parts Kits 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts List 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Common Parts 31. . . . . . . . . . . . . . . . . . . . . . . . . .

Mounting Parts for Panel, Wall, Pipestand

or Actuator Mounting 39. . . . . . . . . . . . . . . . . . .

Introduction

Scope of Manual

This instruction manual provides installation,
operating, maintenance, and parts information for
the Fisher C1 Series pressure controllers and
transmitters shown in figure 1. Refer to separate
instruction manuals for information regarding the
control valve, actuator, and accessories.

Do not install, operate, or maintain C1 Series
pressure controllers and transmitters without first
being fully trained and qualified in valve, actuator,
and accessory installation, operation, and
maintenance. To avoid personal injury and property
damage, it is important to carefully read, understand,
and follow all the contents of this manual, including
all safety cautions and warnings. If you have any
questions about these instructions, contact your
Emerson Process Management sales office before
proceeding.

Description

The C1 Series pneumatic pressure controllers and
transmitters use a bellows or Bourdon tube sensing
element to sense the gauge pressure, vacuum,
compound pressure, or differential pressure of a
liquid or gas. The controller or transmitter output is a
pneumatic pressure signal that can be used to
operate a final control element, indicating device, or
recording device.

Unless otherwise noted, all NACE references are to
NACE MR0175−2002.

September 2009

Educational Services

For information on available courses for C1 Series
controllers and transmitters, as well as a variety of
other products, contact:

Emerson Process Management
Educational Services, Registration
P.O. Box 190; 301 S. 1st Ave.
Marshalltown, IA 50158−2823
Phone: 800−338−8158 or
Phone: 641−754−3771
FAX: 641−754−3431
e−mail: [e-mail]

Installation

WARNING

To avoid personal injury or property

damage resulting from the sudden

release of pressure:

D Always wear protective clothing,
gloves, and eyewear when performing
any installation operations.

D Personal injury or property
damage may result from fire or
explosion if natural gas is used as the
supply medium and appropriate
preventive measures are not taken.
Preventive measures may include, but
are not limited to, one or more of the
following; remote venting of the unit,
re−evaluating the hazardous area
classification, ensuring adequate
ventilation, and the removal of any
ignition sources. For information on
remote venting of this controller/
transmitter, refer to page 8.

D If installing into an existing
application, also refer to the WARNING
at the beginning of the Maintenance
section in this instruction manual.

D Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.

Specifications

Specifications for the C1 Series controllers and
transmitters are listed in table 1. Table 2 explains
available configurations and options.

2

Standard Installation

The instruments are normally mounted vertical with
the case/cover as shown in figure 1. If installing the
instrument in any other position, be sure that the
vent opening shown in figure 2 is facing downward.

Instruction Manual

September 2009

Available Configurations

See table 2

Input Signal

Type: J Gauge pressure, J vacuum,

J compound pressure, or J differential pressure
of a liquid or gas

Limits: See table 3 or 4

Output Signal

Proportional−Only or Proportional−Plus−Reset
Controllers and Transmitters:

J 0.2 to 1.0 bar (3 to 15 psig) or
J 0.4 to 2.0 bar (6 to 30 psig) pneumatic

pressure signal

Differential Gap Controllers:

J 0 and 1.4 bar (0 and 20 psig) or
J 0 and 2.4 bar (0 and 35 psig) pneumatic

pressure signal
Action: Control action is field reversible between
J direct (increasing sensed pressure produces
increasing output signal) and J reverse
(increasing sensed pressure produces decreasing
output signal).

Supply Pressure Requirements

(1)

See table 5

C1 Controllers and Transmitters

Table 1. Specifications

Supply and Output Connections

1/4 NPT internal

Common Signal Pressure Conversions

See table 6

Proportional Band Adjustment

For Proportional−Only Controllers: Full output

pressure change adjustable from J 2% to 100%
of the sensing element range for 0.2 to 1.0 bar (3
to 15 psig) or J 4% to 100% of the sensing
element range for 0.4 to 2.0 bar (6 to 30 psig)

For Proportional−Plus−Reset Controllers: Full
output pressure change adjustable from J 3% to
100% of the sensing element range for 0.2 to 1.0
bar (3 to 15 psig), or J 6% to 100% of the
sensing element range for 0.4 to 2.0 bar (6 to 30
psig)

Differential Gap Adjustment

For Differential Gap Controllers:

Full output pressure change adjustable from
15% to 100% of sensing element range

Reset Adjustment

For Proportional−Plus−Reset Controllers:

Adjustable from 0.01 to 74 minutes per repeat
(100 to 0.01 repeats per minute)

Supply Pressure Medium

Air or natural gas
Air Quality: Supply pressure must be clean, dry air

that meets the requirements of ISA Standard

7.0.01. A maximum 40 micrometer particle size in
the air system is acceptable. Further filtration
down to 5 micrometer particle size is
recommended. Lubricant content is not to exceed
1 ppm weight (w/w) or volume (v/v) basis.
Condensation in the air supply should be
minimized

Natural Gas: Natural gas must be clean, dry,
oil−free, and noncorrosive. H2S content should
not exceed 20 ppm.

Steady−State Air Consumption

(2,3)

0.2 to 1.0 bar (3 to 15 psig): 0.08 normal m3/hour
(3 scfh)

0.4 to 2.0 bar (6 to 30 psig): 0.12 normal m3/hour
(4.5 scfh)

−continued−

Zero Adjustment (Transmitters Only)

Continuously adjustable to position span of less
than 100% anywhere within the sensing element
range

Span Adjustment (Transmitters Only)

Full output pressure change adjustable from 6 to
100% of sensing element range

Performance

Repeatability: 0.5% of sensing element range
Deadband (Except Differential Gap
Controllers)

(4)

: 0.1% of process sensing element

span

Typical Frequency Response at 100%
Proportional Band

Output to Actuator: 0.7 Hz and 110 degree phase
shift with 1850 cm3 (113 inches3) volume,
actuator at mid−stroke
Output to Positioner Bellows: 9 Hz and 130
degree phase shift with 0.2 to 1.0 bar (3 to 15
psig) output to 33 cm3 (2 inches3) bellows

3

Instruction Manual

C1 Controllers and Transmitters

Table 1. Specifications (continued)

Ambient Operating Temperature Limits

J Standard Construction: −40 to 71_C (−40 to
160_F)
J High Temperature Construction: −18 to
104_C (0 to 220_F)

Anti−reset windup (differential pressure relief) and
process pressure gauge options are only
available in the standard construction

If the process temperature is outside the ambient
operating range of the controller, the length of the
capillary tube run from the sensor point to the
controller process input may be adjusted to
protect the controller from the process
temperature

Typical Ambient Temperature Operating
Influence

Proportional Control only:

Output pressure changes $3.0% of sensing
element range for each 28_C (50_F) change in
temperature between −40 and 71_C (−40 and
160_F) for a controller set at 100% proportional
band

Proportional−Plus−Reset Control:

Output pressure changes $2.0% of sensing
element range for each 28_C (50_F) change in
temperature between −40 and 71_C (−40 and
160_F) for a controller set at 100% proportional
band

(1)

September 2009

Transmitters only:

Output pressure changes $3.0% of sensing
element range for each 28_C (50_F) change in
temperature between −40 and 71_C (−40 and
160_F) for a transmitter set at 100% span

Hazardous Area Classification

Complies with the requirements of ATEX Group II
Category 2 Gas and Dust

Refer to figure 25 for location of ATEX marking

Approximate Weight

8.2 kg (18 pounds)

Options

Case pressure tested to 0.14 bar (2 psig)

Declaration of SEP

Fisher Controls International LLC declares this
product to be in compliance with Article 3
paragraph 3 of the Pressure Equipment Directive
(PED) 97 / 23 / EC. It was designed and
manufactured in accordance with Sound
Engineering Practice (SEP) and cannot bear the
CE marking related to PED compliance.

However, the product may bear the CE marking to
indicate compliance with other applicable
European Community Directives.

1. The pressure/temperature limits in this document and any applicable standard or code limitation should not be exceeded.

2. Normal m3/hr: normal cubic meters per hour (m3/hr, 0_C and 1.01325 bar, absolute). Scfh: standard cubic feet per hour (ft3/hr, 60_F and 14.7 psig).

3. To convert from air flow rate to natural gas flow rate multiply by 1.29.

4. An adjustable differential gap (differential gap controllers) is equivalent to an adjustable deadband.

Table 2. Available Configurations

TYPE NUMBER

DESCRIPTION

Proportional−only controller

Proportional−plus−reset controller

Differential gap controller − − −

Transmitter C1D

4

Bourdon Tube Sensing

Element (Gauge Pressure Only)

Without anti−reset windup

With anti−reset windup − − −

C1P C1B

Bellows Sensing Element

Gauge Pressure Differential Pressure

C1D

Instruction Manual

September 2009

C1 Controllers and Transmitters

Table 3. Bourdon Tube Pressure Range and Materials

PRESSURE RANGES

(1,2)

MAXIMUM ALLOWABLE STATIC PRESSURE LIMITS

Standard With Optional Travel Stop

Bar Psig Bar Psig Bar Psig

0 to 2.0
0 to 4.0
0 to 7.0

0 to 14
0 to 20
0 to 40
0 to 70

0 to 100
0 to 200
0 to 350

0 to 550
0 to 700

1. If the process can trip to a pressure outside of the operating range of the sensing element, a commercially available device, such as an overpressure protector, may be used to
protect against pressure surges and pulsations.

2. Range marked on Bourdon tube may be in kPa (1 bar = 100 kPa)

3. Bourdon tube may be pressurized to limit shown without permanent zero shift.

4. With travel stop set at 110% of the range.

5. Bourdon tubes are also available in NACE compliant material. Contact your Emerson Process Management sales office for additional information.

0 to 30
0 to 60
0 to 100

0 to 200
0 to 300
0 to 600
0 to 1000

0 to 1500
0 to 3000
0 to 5000

0 to 8000
0 to 10.000

2.0

4.0

7.0
14

20
40
70

100
200
350

550
700

30
60

100
200

300
600

1000
1500

3000
5000

8000

10,000

3.3

6.6
11

19
29
50
83

115
230
380

550
700

(3)

48
96

160
280

420
720

1200
1650

3300
5500

8000

10,000

(4)

MATERIAL

(5)

316 stainless steel

Table 4. Bellows Pressure Ranges and Materials

PRESSURE RANGES

(1)

0 to 150 mbar (0 to 60 inch wc)

Vacuum

0 to 340 mbar (0 to 10 inch Hg)
0 to 1.0 bar (0 to 30 inch Hg)

75 mbar vac. to 75 mbar (30 inch wc vac. to 30 inch wc)

Compound Pressure

500 mbar vac. to 500 mbar (15 inch Hg vac. to 7.5 psig)

1.0 bar vac. to 1.0 bar (30 inch Hg vac. to 15 psig)

Gauge Pressure

0 to 150 mbar (0 to 60 inch wc)
0 to 250 mbar
0 to 350 mbar

(3)

(0 to 100 inch wc)

(4)

(0 to 140 inch wc)

0 to 0.35 bar (0 to 5 psig)

Positive pressure

0 to 0.5 bar (0 to 7.5 psig)
0 to 0.7 bar (0 to 10 psig)

0 to 1.0 bar (0 to 15 psig)
0 to 1.4 bar (0 to 20 psig)
0 to 2.0 bar (0 to 30 psig)

0 to 300 mbar (0 to 80 inch wc)

Differential Pressure

(5)

0 to 0.7 bar (0 to 10 psi)
0 to 1.4 bar (0 to 20 psi)
0 to 2.0 bar (0 to 30 psi)

1. If the process can trip to a pressure outside of the operating range of the sensing element, a commercially available device, such as an overpressure protector, may be used to protect against
pressure surges and pulsations.

2. Bellows may be pressured to limit shown without permanent zero shift.

3. Transmitter only.

4. Except transmitter.

5. The overrange limit for these sensing elements is a differential pressure equal to the maximum allowable static pressure limit.

MAXIMUM ALLOWABLE STATIC

PRESSURE LIMITS

Brass

Construction

(2)

Stainless Steel

Construction

Bar Psig Bar Psig

1.4

2.8

2.8

1.4

2.8

2.8

1.4

1.4

2.8

2.8

2.8

2.8

2.8

2.8

2.8

1.4

2.8

2.8

−−−

20
40
40

20
40
40

20
20
40
40
40

40
40
40
40

20
40
40

−−−

−−−

−−−

6.9

−−−

6.9

6.9

−−−

−−−

−−−

−−−

−−−

−−−

6.9

−−−

6.9

−−−

−−−

−−−

6.9

−−−

−−−

100

−−−

100
100

−−−

−−−

−−−

−−−

−−−

−−−

100

−−−

100

−−−

−−−

−−−

100

OUTPUT SIGNAL RANGE

Bar

Psig

1. If this pressure is exceeded, control may be impaired.

0.2 to 1.0 or 0 and 1.4 (differential gap) 1.4 2.8

0.4 to 2.0 or 0 and 2.4 (differential gap) 2.4 2.8
3 to 15 or 0 and 20 (differential gap) 20 40
6 to 30 or 0 and 35 (differential gap) 35 40

Table 5. Supply Pressure Requirements

NORMAL OPERATING SUPPLY

PRESSURE

(1)

MAXIMUM ALLOWABLE SUPPLY PRESSURE

TO PREVENT INTERNAL PART DAMAGE

5

Instruction Manual

C1 Controllers and Transmitters

Panel Mounting

Refer to figure 2.
Cut a hole in the panel surface according to the

dimensions shown in figure 2. Remove the cap
screws (key 252), brackets (key 251), and vent
assembly (key 28). Slide the controller or transmitter
into the cutout and reattach the brackets. Tighten the
cap screw located in the center of each bracket to
draw the case snugly and evenly against the panel.
Reinstall the vent unless a remote vent will be used.

Wall Mounting

Refer to figure 2.
Drill four holes in the wall using the dimensions

shown in figure 2. In the bracket (key 251) are 8.7
mm (0.3438 inch) diameter holes. Back out the cap
screw located in the center of each bracket. (The
screws are used for panel mounting but are not
required for wall mounting.) If tubing runs through
the wall, drill holes in the wall to accommodate the
tubings. Figure 2 shows the pressure connection
locations in the back of the case.

Mount the controller to the bracket using the four cap
screws (key 252) provided. Attach the bracket to the
wall, using suitable screws or bolts.

Pipestand Mounting

Refer to figure 2.
Use a hammer and punch to knock out the blanks in

the two holes indicated in the back view of figure 2.
Attach the spacer spools (key 228) and the mounting
plate (key 213) to the controller with cap screws,
lock washers, and nuts (keys 215, 221, and 216).
Attach the controller to a 2−inch (nominal) pipe with
pipe clamps (key 250).

Actuator Mounting

Refer to figure 3.
Controllers specified for mounting on a control valve

actuator are mounted at the factory. If the instrument
is ordered separately for installation on a control
valve actuator, mount the instrument according to
the following instructions.

Mounting parts for the different actuator types and
sizes vary. Two typical actuator−mounting
installations are shown in figure 3; see the parts list
for parts required for the specific actuator type and
size involved.

September 2009

Use a hammer and punch to knock out the blanks in
the two holes indicated in the back view of figure 2.
Attach the spacer spools (key 228) and the mounting
plate (key 213) to the controller with machine
screws, lock washers, and nuts (keys 215, 221, and

216).
Attach the mounting bracket to the actuator yoke

with cap screws (key 222) and, if needed, spacer
spools. On some designs, the mounting bracket is
attached to the actuator diaphragm casing rather
than to the yoke.

Pressure Connections

WARNING

To avoid personal injury or property
damage resulting from the sudden
release of pressure, do not install any
system component where service
conditions could exceed the limits
given in this manual. Use
pressure−relieving devices as required
by government or accepted industry
codes and good engineering practices.

All pressure connections on C1 Series instruments
are 1/4 NPT internal. Use 6 mm (1/4−inch) or 10 mm
(3/8−inch) pipe or tubing for supply and output
piping. The pressure connection locations are shown
in figure 2.

Supply Pressure

WARNING

Severe personal injury or property
damage may occur from an
uncontrolled process if the instrument
supply medium is not clean, dry,
oil−free and noncorrosive. While use
and regular maintenance of a filter that
removes particles larger than 40
micrometers in diameter will suffice in
most applications, check with an
Emerson Process Management field
office and industry instrument supply
medium quality standards for use with
hazardous gas or if you are unsure
about the proper amount or method of
air filtration or filter maintenance.

6

Instruction Manual

September 2009

180.8
(7.12)

VENT ASSEMBLY
(KEY 28)

PIPESTAND MOUNTING

2 INCH
(NOMINAL)
PIPE

C1 Controllers and Transmitters

142.7

(5.62)

65.8

(2.59)

23.1

(0.91)

KNOCK−OUT

63.5

(2.50)

63.5

(2.50)

69.1

(2.72)

BACK VIEW

KNOCK−OUT

244.3
(9.62)

215.9
(8.50)

8.7

(11/32)

MOUNTING
HOLES

PANEL MOUNTING WALL MOUNTING

NOTES:

1. ALL CONNECTIONS ARE 1/4 NPT INTERNAL.
2

HIGH−PRESSURE CONNECTION FOR DIFFERENTIAL−PRESSURE UNITS.

3

LOW−PRESSURE CONNECTION FOR DIFFERENTIAL−PRESSURE UNITS.

E1052

Figure 2. Panel, Wall, and Pipestand Mounting

Supply pressure must be clean, dry air that meets
the requirements of ISA Standard 7.0.01. A
maximum 40 micrometer particle size in the air
system is acceptable. Further filtration down to 5
micrometer particle size is recommended. Lubricant
content is not to exceed 1 ppm weight (w/w) or
volume (v/v) basis. Condensation in the air supply
should be minimized. Alternatively, natural gas may
be used as the supply pressure medium. Gas must
be clean, dry, oil−free, and noncorrosive. H2S
content should not exceed 20 ppm.

Use a suitable supply pressure regulator to reduce
the supply pressure source to the normal operating

218.9
(8.62)

CUTOUT FOR
PANEL MOUNTING

14.3

(0.56) R

FOUR HOLES
FOR WALL
MOUNTING

101.6
(4.00)

mm
(INCH)

supply pressure shown in table 5. Connect supply
pressure to the SUPPLY connection at the back of
the case.

WARNING

To avoid personal injury or property
damage resulting from the sudden
release of process pressure, use a
high pressure regulator system when
operating the controller or transmitter
from a high pressure source.

7

Instruction Manual

C1 Controllers and Transmitters

If operating the controller or transmitter from a high
pressure source [up to 138 bar (2000 psig)], use a
high pressure regulator system, such as the Fisher
1367 High Pressure Instrument Supply System. For
1367 system installation, adjustment, and
maintenance information, refer to the 1367
High−Pressure Instrument Supply System with
Overpressure Protection instruction manual,
D100343X012.

Process Pressure

WARNING

To avoid personal injury or property
damage resulting from the sudden
release of pressure when using
corrosive media, make sure the tubing
and instrument components that
contact the corrosive medium are of
suitable noncorrosive material.

Also refer to the Installation Warning
at the beginning of this section.

The pressure connections to the controller depend
upon the type of pressure sensing, gauge or
differential. Gauge pressure controllers use either a

Bourdon tube or bellows as the sensing element, as
indicated in table 2. Differential pressure controllers
use two bellows to sense differential pressure.

For gauge pressure instruments: The control
pressure block (key 10 in figure 21) has two
connections. Process pressure can be connected
either to the CONTROL connection on the back of
the case, or to the connection on the left side of the
case, shown in figure 2, depending on the
instrument application. Plug the unused connection.

For differential pressure instruments: Connect
the low pressure line to the CONTROL connection
on the side of the case and the high pressure line to
the CONTROL connection on the back of the case
as shown in figure 2.

When installing process piping, follow accepted
practices to ensure accurate transmission of the
process pressure to the controller or transmitter.
Install shutoff valves, vents, drains, or seal systems
as needed in the process pressure lines. If the
instrument is located such that the adjacent process
pressure lines will be approximately horizontal, the
lines should slope downward to the instrument for
liquid−filled lines and upward to instruments for
gas−filled lines. This will minimize the possibility of

September 2009

Table 6. Common Signal Pressure Conversions

Mps kg/cm

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.10

0.12

0.14

0.15

0.17

0.18

0.20

0.22

0.23

0.24

0.34

0.55

0.69

1.03

1. Values as listed in ANSI/S7.4.

2. Values as listed in IEC Standard 382.

3. Values rounded to correspond with kPa values.

0.2

0.3

0.4

0.5

0.6

0.8

0.8

1.0

1.0

1.3

1.4

1.5

1.8

1.9

2.0

2.2

2.3

2.5

3.5

5.6

7.0

10.5

2

(3)

bar kPa Psi

0.2

0.3

0.4

0.5

0.6

0.8

0.8

1.0

1.0

1.2

1.4

1.5

1.7

1.9

2.0

2.2

2.3

2.4

3.4

5.5

6.9

10.3

(2)

(2)

(3)

20

35

40

50
60

75
80
95

100

125
140

150
170
185

200

220
230
240
345
550

690

1035

(1)

(1)

(1)

(1)

3
5
6
7
9

11
12
14
15
18

20
22
25
27
30

32
33
35
50
80

100
150

air becoming trapped in the sensor with liquid−filled
lines or of condensation becoming trapped with
gas−filled lines. The recommended slope is 83 mm
per meter (1 inch per foot).

If a controller is being used in conjunction with a
control valve to control pipeline pressure, connect
the process pressure line in a straight section of pipe
approximately 10 pipe diameters from the valve but
away from bends, elbows, and areas of abnormal
fluid velocities. For pressure−reducing service, the
process line must be connected downstream of the
valve. For pressure−relief service, the process
pressure line must be connected upstream of the
control valve. Install a needle valve in the process
pressure line to dampen pulsations.

Vent Assembly

WARNING

Personal injury or property damage
could result from fire or explosion of
accumulated gas, or from contact with
hazardous gas, if a flammable or
hazardous gas is used as the supply
pressure medium. Because the
instrument case and cover assembly
do not form a gas−tight seal when the
assembly is enclosed, a remote vent

8

Instruction Manual

September 2009

line, adequate ventilation, and
necessary safety measures should be
used to prevent the accumulation of
flammable or hazardous gas. However,
a remote vent pipe alone cannot be
relied upon to remove all flammable
and hazardous gas. Vent line piping
should comply with local and regional
codes, and should be be as short as
possible with adequate inside diameter
and few bends to reduce case
pressure buildup.

CAUTION

When installing a remote vent pipe,
take care not to overtighten the pipe in
the vent connection. Excessive torque
will damage the threads in the
connection.

The vent assembly (key 28, figure 2) or the end of a
remote vent pipe must be protected against the
entrance of all foreign matter that could plug the
vent. Use 13 mm (1/2−inch) pipe for the remote vent
pipe, if one is required. Check the vent periodically
to be certain it has not become plugged.

C1 Controllers and Transmitters

SUPPLY PRESSURE
REGULATOR

GE33946−A

TYPICAL ROTARY ACTUATOR

Controller Operation

Proportional−Only Controllers

This section describes the adjustments and
procedures for calibration and startup. Adjustment
locations are shown in figure 4 unless otherwise
specified. All adjustments must be made with the
cover open. When the adjustments and calibration
procedures are complete, close and latch the cover.

To better understand the adjustments and overall
operation of the controller, refer to the Principle of
Operation section in this manual for
proportional−only controllers. Refer also to the
schematic diagram in figure 13.

Adjustments

Adjustment: Set Point

Adjust the pressure setting knob by turning the knob
clockwise to increase the set point and
counterclockwise to decrease the set point. Note
that the dial setting and actual process pressure may
vary significantly, especially with a wide proportional
band setting.

SUPPLY PRESSURE
REGULATOR

GE33947−A

TYPICAL SLIDING STEM ACTUATOR

Figure 3. Actuator Mounting

Adjustment: Proportional Band

To adjust the proportional band, rotate the
proportional band adjustment knob to the desired
value.

The proportional band adjustment determines the
amount of change in controlled pressure required to
cause the control valve to stroke fully. It may be
adjusted from 2 to 100 percent for 0.2 to 1.0 bar (3
to 15 psig) or 4 to 100 percent for 0.4 to 2.0 bar (6 to
30 psig) of the nominal sensing element pressure
rating.

9

Instruction Manual

C1 Controllers and Transmitters

CALIBRATION ADJUSTER (KEY 36)

GE28280−B
E1059

ADJUSTER SCREWS (KEY 48)

Figure 4. Proportional−Only Controller Adjustment Locations

FLAPPER (KEY 40)

NOZZLE (KEY 54)

September 2009

PRESSURE SETTING KNOB
(KEY 58)

PRESSURE SETTING
DIAL (KEY 6)

PROPORTIONAL BAND
ADJUSTMENT KNOB

Calibration: Proportional−Only
Controllers

Unless otherwise indicated, key number locations
are shown in figure 4.

Provide a process pressure source capable of
simulating the process pressure range of the
controller. If an output pressure gauge is not
provided, install a suitable pressure gauge for
calibration purposes.

Connect a pressure source to the supply pressure
regulator and be sure the regulator is delivering the
correct supply pressure to the controller. The
controller must be connected open loop (Open loop:
The controller output pressure changes must be
dead ended into a pressure gauge). The following
procedures use a 0.2 to 1.0 bar (3 to 15 psig) output
pressure range as an example. For a 0.4 to 2.0 bar
(6 to 30 psig) output range, adjust the values as
appropriate.

1. Complete the above connections and provide a
process pressure equal to the sensing element
range.

2. Rotate the proportional band adjustment knob,
shown in figure 4, to 1.5 (15 percent proportional
band).

3. Verify that the calibration adjuster screws
(key 48) are at mid−position in the calibration
adjuster (key 36) slots.

IF OUTPUT IS:

NOZZLE

BELOW
8 TO 10 PSIG
(0.6 TO 0.7 BAR)

MOVE ADJUSTER
RIGHT

ABOVE
8 TO 10 PSIG
(0.6 TO 0.7 BAR)

MOVE ADJUSTER

NOTE:
3 TO 15 PSIG (0.2 TO 1.0 BAR) OUTPUT SHOWN.
FOR 6 TO 30 PSIG (0.4 TO 2.0 BAR) OUTPUT, ADJUST
VALUES AS APPROPRIATE.

A6155−1 / IL

LEFT

FLAPPER

Figure 5. Reverse−Acting Controller Span Adjustment —

Proportional−Only Controllers

Depending upon the controller action, perform one
or the other of the following procedures.

For reverse−acting controllers:

4. Apply an input pressure equal to the sensing
element upper range value.

10

Instruction Manual

September 2009

5. Rotate the pressure setting knob to the maximum
value.

6. Adjust the nozzle (key 54) until the controller
output pressure is between 0.6 and 0.7 bar (8
and 10 psig).

7. Apply an input pressure equal to the sensing
element lower range value.

8. Rotate the pressure setting knob to the minimum
value.

Note

When performing the span adjustment
in step 9, do not watch the output
gauge while changing the calibration
adjuster. The change in output is not a
good indication of the change in span.
While moving the calibration adjuster,
the output pressure may change in the
opposite direction than expected. For
example, while moving the calibration
adjuster to increase span, the output
pressure may decrease. This should
be disregarded since even though the
output pressure decreases, the span is
increasing.

Proper controller response depends
on nozzle−to−flapper alignment.

When performing span adjustments,
carefully loosen both calibration
adjuster screws while holding the
calibration adjuster in place. Then
move the calibration adjuster slightly
in the required direction by hand or
using a screwdriver. Verify proper
nozzle−to−flapper alignment and hold
the calibration adjuster in place while
tightening both adjustment screws.

9. If the output is not between 0.6 and 0.7 bar (8
and 10 psig), adjust the controller span by loosening
the two adjusting screws (key 48) and moving the
calibration adjuster (key 36) a small distance as
indicated in figure 5.

10. Repeat steps 4 through 9 until no further
adjustment is necessary.

11. Proceed to the startup procedure for
proportional controllers.

For direct−acting controllers:

4. Apply an input pressure equal to the sensing
element lower range value.

C1 Controllers and Transmitters

IF OUTPUT IS:

BELOW
8 TO 10 PSIG
(0.6 TO 0.7 BAR)

MOVE ADJUSTER

NOTE:
3 TO 15 PSIG (0.2 TO 1.0 BAR) OUTPUT SHOWN.
FOR 6 TO 30 PSIG (0.4 TO 2.0 BAR) OUTPUT, ADJUST
VALUES AS APPROPRIATE.

A6154 / IL

LEFT

FLAPPER

Figure 6. Direct−Acting Controller Span

Adjustment—Proportional−Only Controllers

5. Rotate the pressure setting knob to the minimum
value.

6. Adjust the nozzle (key 54) until the controller
output pressure is between 0.6 and 0.7 bar (8
and 10 psig.)

7. Apply an input pressure equal to the sensing
element upper range value.

8. Rotate the pressure setting knob to the maximum
value.

Note

When performing the span adjustment
in step 9, do not watch the output
gauge while changing the calibration
adjuster. The change in output is not a
good indication of the change in span.
While moving the calibration adjuster,
the output pressure may change in the
opposite direction than expected. For
example, while moving the calibration
adjuster to increase span, the output
pressure may decrease. This should
be disregarded since even though the
output pressure decreases, the span is
increasing.

Proper controller response depends
on nozzle−to−flapper alignment.

When performing span adjustments,
carefully loosen both calibration

MOVE ADJUSTER
RIGHT

NOZZLE

ABOVE
8 TO 10 PSIG
(0.6 TO 0.7 BAR)

11

Instruction Manual

C1 Controllers and Transmitters

adjuster screws while holding the
calibration adjuster in place. Then
move the calibration adjuster slightly
in the required direction by hand or
using a screwdriver. Verify proper
nozzle−to−flapper alignment and hold
the calibration adjuster in place while
tightening both adjustment screws.

9. If the output is not between 0.6 and 0.7 bar (8
and 10 psig), adjust the controller span by loosening
the two adjusting screws (key 48) and moving the
calibration adjuster (key 36) a small distance as
indicated in figure 6.

10. Repeat steps 4 through 9 until no further
adjustment is necessary.

11. Proceed to the startup procedure for
proportional controllers.

Startup: Proportional−Only Controllers
(General Tuning Guidelines)

Calibrate the controller prior to this procedure.

1. Be sure that the supply pressure regulator is
delivering the proper supply pressure to the
controller.

2. Rotate the pressure setting knob to the desired
set point.

3. Set the proportional band adjustment to 100
percent for fast processes (example: liquid pressure
or liquid flow). For slow processes (example:
temperature), calculate the percentage from the
equation below:

For a slow process, determine the initial proportional
band setting in percent from the following equation:

September 2009

2 Allowable Overshoot

Pressure Span

For example:

2 0.14 bar

2.1 bar

2 2 psig

(

30 psig

1.3 proportional band setting

4. Proportional Action
Disturb the system by tapping the flapper lightly or

change the set point a small amount and check for
system cycling. If the system does not cycle then
lower the proportional band (raising the gain) and
disturb the system again. Continue this procedure
until the system cycles. At that point, double the
proportional band setting.

Proportional band adjustment affects
the set point. Proportional−only
controllers will show some offset from
set point depending upon proportional
band setting and process demand.
After adjusting the proportional band,
re−zero by carefully rotating the nozzle
(key 54) until the steady−state process
pressure equals the pressure setting
dial reading.

This tuning procedure may be too conservative for
some systems. The recommended proportional band
setting should be checked for stability by introducing
a disturbance and monitoring the process.

100% ^ 13%

100% ^ 13%

100% + P.B.

)

Note

12

Instruction Manual

September 2009

CALIBRATION ADJUSTER (KEY 36)

GE28281−B
E1060

C1 Controllers and Transmitters

RESET ADJUSTMENT KNOB

FLAPPER (KEY 40)

ADJUSTER SCREWS (KEY 48)

Figure 7. Proportional−Plus−Reset Controller Adjustment Locations

NOZZLE (KEY 54)

PRESSURE SETTING KNOB
(KEY 58)

PRESSURE SETTING
DIAL (KEY 6)

PROPORTIONAL BAND
ADJUSTMENT KNOB

Proportional−Plus−Reset Controllers

This section describes the adjustments and
procedures for calibration and startup. The
adjustment locations are shown in figure 7 unless
otherwise specified. All adjustments must be made
with the cover open. When the adjustments and
calibration procedures are complete, close and latch
the cover. To better understand the adjustments and
overall operation of the controller, refer to the
Principle of Operation section in this manual for
proportional−plus−reset controllers. Refer also to the
schematic diagram in figure 13.

Adjustments

Adjustment: Set Point

Adjust the pressure setting knob by turning the knob
clockwise to increase the set point and
counterclockwise to decrease the set point.

Rotate the knob until the indicator points to the
desired set point pressure value. The pressure
setting dial will reflect the desired set point if the
controller is accurately calibrated.

Adjustment: Proportional Band

To adjust the proportional band, rotate the
proportional band adjustment knob to the desired
value.

The proportional band adjustment determines the
amount of change in controlled pressure required to
cause the control valve to stroke fully. It may be
adjusted from 3 to 100 percent for 0.2 to 1.0 bar (3
to 15 psig) or 6 to 100 percent for 0.4 to 2.0 bar (6 to
30 psig) of the nominal sensing element pressure
rating.

Adjustment: Reset

To adjust reset action turn the knob clockwise to
decrease the minutes per repeat. Turn the knob
counterclockwise to increase the minutes per repeat.
Increasing the minutes per repeat provides a slower
reset action.

The reset adjustment dial is calibrated in minutes per
repeat. By definition, this is the time in minutes
required for the reset action to produce an output
change which is equal to the change produced by
proportional control action. This is in effect, the time
in minutes required for the controller to increase (or
decrease) its output pressure by an amount equal to
a proportional increase (or decrease) caused by a
change in set point or process pressure.

13

Instruction Manual

C1 Controllers and Transmitters

Adjustment: Anti−Reset Windup

The externally mounted differential relief valve can
be mounted to relieve on increasing or decreasing
output pressure.

Calibration

Calibration: Proportional−Plus−Reset Controllers

Unless otherwise indicated, key number locations
are shown in figure 7.

Before starting this procedure:

D Provide a process pressure source capable of
simulating the process pressure range of the
controller.

D If an output pressure gauge is not provided,
install a suitable pressure gauge for calibration
purposes. The controller must be connected open
loop (Open loop: The controller output pressure
changes must be dead ended into a pressure
gauge).

Note

C1P and C1B controllers with
anti−reset windup are supplied with
two O−rings (key 81), an anti−reset
windup cover (key 80), and two
machine screws (key 82). Use these
parts in the next step.

1. For C1P and C1B controllers with anti−reset
windup record the direction of the arrow on the
anti−reset windup assembly (key 190, in figure 22).
Remove the assembly and install the two O−rings
(key 81), and cover (key 80) supplied with the
controller. Secure the cover with the two machine
screws (key 82) provided.

2. Connect regulated supply pressure to the
controller. Do not exceed the normal operating
pressure in table 5.

3. Rotate the reset knob to 0.01 minutes per repeat
(fastest setting).

4. Rotate the proportional band adjustment knob
to 1.5 (15 percent proportional band).

5. Verify that the calibration adjuster screws
(key 48) are at mid−position in the calibration
adjuster (key 36) slots.

Depending upon the controller action, perform one
or the other of the following procedures.

September 2009

IF OUTPUT IS:

ABOVE
8 TO 10 PSIG
(0.6 TO 0.7 BAR)

MOVE ADJUSTER

NOTE:
3 TO 15 PSIG (0.2 TO 1.0 BAR) OUTPUT SHOWN.
FOR 6 TO 30 PSIG (0.4 TO 2.0 BAR) OUTPUT, ADJUST
VALUES AS APPROPRIATE.

A6155−1 / IL

Figure 8. Reverse−Acting Controller Span Adjustment—

LEFT

FLAPPER

Proportional−Plus−Reset Controllers

BELOW
8 TO 10 PSIG
(0.6 TO 0.7 BAR)

MOVE ADJUSTER
RIGHT

NOZZLE

For reverse−acting controllers:

6. Apply an input pressure equal to the sensing
element upper range value.

7. Rotate the pressure setting knob to the maximum
value.

8. Adjust the nozzle (key 54) until the controller
output pressure is between 0.6 and 0.7 bar (8
and 10 psig).

9. Apply an input pressure equal to the sensing
element lower range value.

10. Rotate the pressure setting knob to the
minimum value.

Note

When performing the span adjustment
in step 11, do not watch the output
gauge while changing the calibration
adjuster. The change in output is not a
good indication of the change in span.
While moving the calibration adjuster,
the output pressure may change in the
opposite direction than expected. For
example, while moving the calibration
adjuster to increase span, the output
pressure may decrease. This should
be disregarded since even though the
output pressure decreases, the span is
increasing.

14

Instruction Manual

September 2009

Proper controller response depends
on nozzle−to−flapper alignment.

When performing span adjustments,
carefully loosen both calibration
adjuster screws while holding the
calibration adjuster in place. Then
move the calibration adjuster slightly
in the required direction by hand or
using a screwdriver. Verify proper
nozzle−to−flapper alignment and hold
the calibration adjuster in place while
tightening both adjustment screws.

11. If the output pressure is not between 0.6 and 0.7
bar (8 and 10 psig), adjust the controller span by
loosening the two adjusting screws (key 48) and
moving the calibration adjuster (key 36) a small
distance as indicated in figure 8.

12. Repeat steps 6 through 11 until no further
adjustment is necessary.

13. For C1P and C1B controllers with anti−reset
windup, remove the two machine screws, anti−reset
windup cover, and two O−rings installed in step 1 of
this procedure. Install the anti−reset windup
assembly (key 190) with the arrow pointing in the
direction recorded in step 1.

14. Proceed to the Startup procedures for
proportional−plus−reset controllers.

For direct−acting controllers:

6. Apply an input pressure equal to the sensing
element lower range value.

7. Rotate the pressure setting knob to the minimum
value.

8. Adjust the nozzle (key 54) until the controller
output pressure is between 0.6 and 0.7 bar (8
and 10 psig).

9. Apply an input pressure equal to the sensing
element upper range value.

10. Rotate the pressure setting knob to the
maximum value.

Note

When performing the span adjustment
in step 11, do not watch the output
gauge while changing the calibration
adjuster. The change in output is not a
good indication of the change in span.
While moving the calibration adjuster,

C1 Controllers and Transmitters

IF OUTPUT IS:

BELOW
8 TO 10 PSIG
(0.6 TO 0.7 BAR)

MOVE ADJUSTER

NOTE:
3 TO 15 PSIG (0.2 TO 1.0 BAR) OUTPUT SHOWN.
FOR 6 TO 30 PSIG (0.4 TO 2.0 BAR) OUTPUT, ADJUST
VALUES AS APPROPRIATE.

A6154 / IL

LEFT

FLAPPER

Figure 9. Direct−Acting Controller Span Adjustment

—Proportional−Plus−Reset Controllers

the output pressure may change in the
opposite direction than expected. For
example, while moving the calibration
adjuster to increase span, the output
pressure may decrease. This should
be disregarded since even though the
output pressure decreases, the span is
increasing.

Proper controller response depends
on nozzle−to−flapper alignment.

When performing span adjustments,
carefully loosen both calibration
adjuster screws while holding the
calibration adjuster in place. Then
move the calibration adjuster slightly
in the required direction by hand or
using a screwdriver. Verify proper
nozzle−to−flapper alignment and hold
the calibration adjuster in place while
tightening both adjustment screws.

11. If the output pressure is not between 0.6 and 0.7
bar (8 and 10 psig), adjust the controller span by
loosening the two adjusting screws (key 48) and
moving the calibration adjuster (key 36) a small
distance as indicated in figure 9.

12. Repeat steps 6 through 11 until no further
adjustment is necessary.

13. For C1P and C1B controllers with anti−reset
windup remove the two machine screws, anti−reset
windup cover, and two O−rings installed in step 1 of
this procedure. Install the anti−reset windup
assembly (key 190) with the arrow pointing in the
direction recorded in step 1.

ABOVE
8 TO 10 PSIG
(0.6 TO 0.7 BAR)

MOVE ADJUSTER
RIGHT

NOZZLE

15

Instruction Manual

C1 Controllers and Transmitters

14. Proceed to the Startup procedures for
proportional−plus−reset controllers.

Calibration: Anti−Reset Windup

Controllers with anti−reset windup have a differential
relief valve assembly (figure 22). This relief valve is
set at the factory to relieve at a 0.3 bar (5 psi)
pressure difference between the reset bellows
pressure and the proportional bellows pressure. The
valve can be adjusted to relieve from 0.14 to 0.4 bar
(2 to 7 psig).

The relief valve can relieve on either rising controller
output pressure or falling controller output pressure.
If the arrow on the relief valve points toward the
bottom of the controller case as shown in figure 22,
the valve will relieve on falling output pressure. If the
arrow points in the opposite direction, the valve will
relieve on rising output pressure. The valve can be
removed and reinstalled with the arrow pointing in
the opposite direction to change the relief action.

Startup: Proportional−Plus−Reset
Controllers (General Tuning Guidelines)

Calibrate the controller prior to this procedure.

1. Be sure that the supply pressure regulator is
delivering the proper supply pressure to the
controller.

2. Rotate the pressure setting knob to the desired
set point.

3. Start with a reset setting of 0.05 minutes per
repeat (m/r) for fast processes, and 0.5 m/r for slow
processes.

4. Set the proportional band adjustment to 100
percent for fast processes (example: liquid pressure
or liquid flow). For a slow process (example:
temperature), calculate the percentage from the
equation below:

For a slow process, determine the initial proportional
band setting in percent from the following equation:

2 Allowable Overshoot

Pressure Span

100% + P.B.

September 2009

5. Proportional Action:
Disturb the system by tapping the flapper lightly or

change the set point a small amount and check for
system cycling. If the system does not cycle then
lower the proportional band (raising the gain) and
disturb the system again. Continue this procedure
until the system cycles. At that point, double the
proportional band setting and begin tuning the reset.

6. Reset Action:
Disturb the system. If the system does not cycle then

speed up the reset and disturb the system again.
Continue this procedure until the system cycles.
When the system cycles multiply the reset time
setting by a factor of three (3) and slow the reset
down to the new value. The reset is now tuned.

This tuning procedure may be too conservative for
some systems. The recommended proportional band
and reset setting should be checked for stability by
introducing a disturbance and monitoring the
process as previously described. For some
applications, tighter control may be desirable.

Differential Gap Controllers

This section describes the adjustments and
procedures for calibration and startup. The
adjustment locations are shown in figure 4 unless
otherwise specified. The output of each controller is
checked at the factory before the instrument is
shipped.

To convert a differential gap controller to a
proportional−only controller or vice versa, refer to the
appropriate procedure in the Maintenance section.

If the process pressure can be varied through all or
part of the sensing element range or through the two
desired switching points, use the process pressure
for calibration. If not, provide a pressure source to
simulate the process pressure range for calibration
procedures.

To better understand the adjustments and overall
operation of the controller, refer to the Principle of
Operation section in this manual for differential gap
controllers and the schematic diagram in figure 13.

For example:

2 0.14 bar

2.1 bar

2 2 psig

()

30 psig

1.3 proportional band setting

16

100% ^ 13%

100% ^ 13%

Adjustments

Adjustment: Set Point

The position of the pressure setting knob determines
the location of the differential gap within the range of
the pressure sensing element. Move the pointer to
the desired pressure where the output of the
controller should switch from zero to full supply

Instruction Manual

September 2009

PROPORTIONAL BAND KNOB SETTING

A2202−3 / IL

Figure 10. Differential Gap Adjustment for Differential Gap

DIFFERENTIAL GAP (PERCENT OF ELEMENT RANGE)

Controllers

pressure with rising process pressure (direct−acting
controllers) or with falling process pressure
(reverse−acting controllers).

Adjustment: Proportional Band

C1 Controllers and Transmitters

b. Unscrew the spring adjustor (key 65),
removing the bias spring (key 70) and washers
(key 62) with it.

c. Unclip the lock spring (key 72). Remove the
indicator scale (key 69) and proportional band
adjustment knob (key 73).

d. Remove the gain adjustment bar (key 63). Flip
it over so it attaches to the opposite side of the
cantilever spring (key 8) as shown in figure 16
and screw it back down.

e. Flip over the indicator scale (key 69); install it
and the proportional band adjustment knob
(key 73) as a unit. Snap in the lock spring
(key 72).

f. Tighten down the spring adjustor (key 65) with
the bias spring (key 70) and washers (key 62)
until it stops against the gain adjustment bar
(key 63).

The proportional band adjustment shown in figure 4
determines the width of the differential gap. The
width of the gap is the difference between the
process pressures at which the controller output will
switch from zero to full supply pressure, or from full
supply pressure to zero. The relationship between
the proportional band dial setting and the differential
gap is shown in figure 10.

Calibration: Differential Gap Controllers

The output of each controller is checked at the
factory before the unit is shipped. Before placing the
controller in control of a process loop, check to verify
that the controller is calibrated correctly for the
application. The controller must be connected open
loop (Open loop: The controller output pressure
changes must be dead ended into a pressure
gauge).

1. Temporarily convert the differential gap controller
to proportional−only controller by disconnecting the
proportional tubing (key 25, figure 16) from the
mounting base. Reinstall the tubing into the other
connection in the mounting base. Remove the
proportional band assembly and invert it as shown in
figure 16. Do not invert the reversing block (key 37,
figure 16).

2. Temporarily invert the proportional band
assembly (refer to figure 18):

a. Turn the proportional band assembly (key 73)
to 10.

g. Turn the proportional band adjustment knob to
the 10 setting. If it cannot be turned to the 10
setting, loosen the spring adjustor (key 65).

3. Calibrate using the calibration procedure for
proportional−only controllers found on page 10 of
this manual.

4. When calibration is complete, return the tubing
(key 25) and the proportional band assembly to their
original locations and continue on with step 5 of this
procedure.

Note

After reinstalling the tubing (key 25)
and proportional band assembly a
slight offset of the output pressure will
be noticed due to a combination of
switching from the proportional
bellows to the reset bellows and the
repositioning of the cantilever spring.
Performing step 6b below adjusts for
this offset.

5. Refer to figure 10 to determine the proportional
band dial setting required for the desired differential
gap.

For example, assume that a 0 to 100 psig sensing
element is being used and the controller is to switch
from zero to full supply pressure at a process

17

Instruction Manual

C1 Controllers and Transmitters

ADJUSTER SCREWS (KEY 48)

GE34729−B
E1061

CALIBRATION ADJUSTER (KEY 36)

Figure 11. Transmitter Adjustment Locations

FLAPPER (KEY 40)

NOZZLE (KEY 54)

September 2009

ZERO ADJUSTMENT KNOB
(KEY 58)

PRESSURE SETTING
DIAL (KEY 6)

SPAN ADJUSTMENT KNOB

pressure of 80 psig with rising process pressure and
from full supply pressure to zero at 20 psig with
falling pressure. (This is for a direct−acting
controller.) The differential gap is:

5.5 bar * 1.3 bar

6.9 bar

80 psig * 20 psig

(

100 psig

100% + 60%

100% + 60%

)

From figure 10, the proportional band dial setting
should be approximately 4.5; rotate the proportional
band adjustment knob to 4.5.

6. Setting the process pressure

For a Direct−Acting Controller:

a. Rotate the pressure setting knob to the
pressure at which the controller output is to
switch to the upper switching point (zero to full
supply pressure) with rising process pressure. In
the above example, this pressure is 5.5 bar (80
psig).

b. Increase pressure to the sensing element
while monitoring the output pressure gauge. The
controller output pressure should switch from
zero to full supply pressure when the upper

switching point is reached with rising input
pressure.

Note

If the upper switching point is not
correct, adjust the nozzle to correct
the error. Repeat step 6b until the
input pressure and upper switching
point are at the desired setting.

c. With falling input pressure, the output should
switch from full supply pressure back to zero
when the lower switching point is reached.

Reverse−acting controllers produce the opposite
response.

7. Vary the process pressure and observe the
switching points. Widen or narrow the differential
gap by rotating the proportional band adjustment
knob, then repeat the above steps.

If the output is within the limits stated, refer to the
startup procedures in this section. If the output
pressure cannot be adjusted within the limits stated,
refer to the maintenance procedures.

18

Instruction Manual

September 2009

Startup: Differential Gap Controllers

Calibrate the controller prior to this procedure.

1. Be sure that the supply pressure regulator is
delivering the proper supply pressure to the
controller.

2. Adjust the proportional band setting for the proper
differential gap (see figure 10).

3. If the controller is used in conjunction with a
control valve, slowly open the upstream and
downstream manual shutoff valves, and close the
bypass valves.

4. To change the differential gap, perform steps 1
through 5 of the calibration for differential gap
controllers procedure.

Transmitter Operation

This section describes the adjustments and
procedures for calibration and startup. Refer to
figure 11 for the adjustment locations. All
adjustments must be made with the cover open.
When the adjustments and calibration procedures
are complete, close and latch the cover.

To better understand the adjustments and overall
operation of the transmitter, refer to the Principle of
Operation section in this manual for transmitters.
Refer also to the schematic diagram in figure 13.

Adjustments

Adjustment: Zero

The pressure setting dial is marked ZERO
ADJUSTMENT PRESSURE SETTING. Zero is in the
center of the dial, and the pressure values increase
to the right and left of the center as shown in figure

11. To set the zero, rotate the pointer around the
pressure setting dial. Rotate the pointer clockwise to
increase or counterclockwise to decrease the output
depending on transmitter action and desired setting.

For direct−acting transmitters, zero adjustment
determines the process pressure at which the
transmitter output signal will be at its lower range
limit.

The dial (key 6) graduations are approximate
indications of the transmitter zero setting. When
making adjustments, do not rely solely on the dial
setting. Monitor the process pressure and output
pressure to be sure the desired settings are attained.

C1 Controllers and Transmitters

Adjustment: Span

The span adjustment is graduated from 0 to 10. A
setting of 10 represents a span setting of 100
percent of the process sensing element range. The
transmitter achieves the highest accuracy when the
span is 100 percent.

The transmitter span adjustment shown in figure 11
is the same as the controller proportional band
adjustment.

Calibration: Transmitters

The output of each transmitter is checked at the
factory before the unit is shipped. The transmitter
provides an output signal that is proportional to the
pressure applied to the sensing element. The output
pressure has no direct effect on the process
pressure.

The transmitter is calibrated at the factory and
should not need additional adjustment. Use the
following calibration procedures when the sensing
element has been changed or other maintenance
procedures have altered the calibration of the
transmitter. The following procedures use a 0.2 to

1.0 bar (3 to 15 psig) output pressure range as an
example. For other output pressure ranges [such as

0.4 to 2.0 bar (6 to 30 psig)] adjust the values to
match the application.

Provide a process pressure source capable of
simulating the process pressure range of the
transmitter. If an output pressure gauge is not
provided, install a suitable pressure gauge for
calibration purposes. Connect a pressure source to
the supply pressure regulator and be sure the
regulator is delivering the correct supply pressure to
the transmitter.

Note

For stability, some transmitter
applications will require additional
volume than just the gauge. Provide a
minimum volume of approximately 25
cm3 (1.5 in3) or greater if stability is a
problem.

Unless otherwise indicated, key number locations
are shown in figure 11.

1. Complete the above connections and provide a
process pressure equal to the sensing element
range.

2. Rotate the span adjustment knob to the
maximum setting on the dial (100 percent span).

19

Instruction Manual

C1 Controllers and Transmitters

IF OUTPUT IS:

BELOW
15 PSIG
(1.0 BAR)

MOVE ADJUSTER

NOTE:
3 TO 15 PSIG (0.2 TO 1.0 BAR) OUTPUT SHOWN.
FOR 6 TO 30 PSIG (0.4 TO 2.0 BAR) OUTPUT, ADJUST
VALUES AS APPROPRIATE.

A6156 / IL

LEFT

Figure 12. Transmitter Span Adjustment

3. Verify that the calibration adjuster screws
(key 48) are at mid−position in the calibration
adjuster (key 36) slots.

Depending upon the transmitter action, perform one
or the other of the following procedures.

For reverse−acting transmitters:

4. Rotate the zero adjustment knob to zero.

5. Apply an input pressure equal to the sensing
element upper range limit.

6. Adjust the nozzle (key 57) until the transmitter
output pressure is at 0.2 bar (3 psig).

7. Set the input pressure equal to zero.

Note

Proper transmitter response depends
on nozzle−to−flapper alignment.

When performing the span adjustment
in step 8, carefully loosen both
calibration adjuster screws while
holding the calibration adjuster in
place. Then move the calibration
adjuster slightly in the required
direction by hand or using a
screwdriver. Verify proper
nozzle−to−flapper alignment and hold
the calibration adjuster in place while
tightening both adjustment screws.

ABOVE
15 PSIG
(1.0 BAR)

MOVE ADJUSTER
RIGHT

September 2009

8. If the output pressure is not 15 psig, adjust the
span by loosening the two adjusting screws (key 48)
and moving the calibration adjuster (key 36) a small
distance as indicated in figure 12.

9. Repeat steps 4 through 8 until no further
adjustment is necessary.

10. Proceed to the startup procedure for
transmitters.

For direct−acting transmitters:

4. Rotate the zero adjustment knob to zero.

5. Set the input pressure to zero.

6. Adjust the nozzle (key 54) until the transmitter
output pressure is at 0.2 bar (3 psig).

7. Apply an input pressure equal to the sensing
element upper range value.

Note

Proper transmitter response depends
on nozzle−to−flapper alignment.

When performing the span adjustment
in step 8, carefully loosen both
calibration adjuster screws while
holding the calibration adjuster in
place. Then move the calibration
adjuster slightly in the required
direction by hand or using a
screwdriver. Verify proper
nozzle−to−flapper alignment and hold
the calibration adjuster in place while
tightening both adjustment screws.

8. If the output pressure is not 15 psig, adjust the
span by loosening the two adjusting screws (key 48)
and moving the calibration adjuster (key 36) a small
distance as indicated in figure 12.

9. Repeat steps 4 through 8 until no further
adjustment is necessary.

10. Proceed to the startup procedure for
transmitters.

Startup: Transmitters

1. Be sure that the supply pressure regulator is
delivering the proper supply pressure to the
transmitter.

2. Refer to the calibration procedures for the
transmitter initial settings.

20

Instruction Manual

September 2009

CONSTANT SUPPLY
PRESSURE

EXHAUST END OF RELAY

BOURDON TUBE

FIXED
PIVOT

TO FINAL
CONTROL
ELEMENT

BEAM AND
FLAPPER

SENSED PRESSURE OUTPUT PRESSURE NOZZLE PRESSURE RESET PRESSURE

GE23696
GE34724−A
E1062

Figure 13. Schematic of Reverse−Acting Proportional−Only and Proportional−Plus−Reset Controllers

EXHAUST

NOZZLE

SENSED
PRESSURE

PROPORTIONAL-ONLY

CONTROLLER

RESET BELLOWS

PROPORTIONAL
BELLOWS

C1 Controllers and Transmitters

INLET END OF
RELAY VALVE

SMALL DIAPHRAGM

LARGE DIAPHRAGM
RESTRICTION

VENT

CANTILEVER
SPRING

PRESSURE SETTING KNOB
PRESSURE SETTING DIAL

RESET

PROPORTIONAL
BAND ADJUSTMENT
KNOB

BELLOWS

PROPORTIONAL
BELLOWS

PROPORTIONAL-PLUS-RESET

CONTROLLER

RESET
VALVE

3. If the transmitter is used in conjunction with a
control valve, slowly open the upstream and
downstream manual shutoff valves, and close the
bypass valves.

Principle of Operation

The following sections describe the operation of a
controller or transmitter using a Bourdon tube
sensing element. The operation is the same for an
instrument using a bellows sensing element (key 71,
figure 24) except that movement of the beam is
caused by expansion or contraction of the bellows or
differential bellows.

Proportional−Only Controllers

As shown in figure 13, supply pressure enters the
relay and bleeds through the fixed orifice before
escaping through the nozzle. Nozzle pressure also
registers on the large relay diaphragm, and loading
pressure (controller output pressure) registers on the
small relay diaphragm.

A change in the process pressure moves the beam
and flapper with respect to the nozzle by either
expanding or contracting the Bourdon tube arc. An

increasing process pressure with direct action (or
decreasing pressure with reverse action) produces a
nozzle−flapper restriction that increases the loading
on the large relay diaphragm and opens the relay
valve. Additional supply pressure flows through the
relay chamber to increase the loading pressure on
the control valve actuator. A decreasing process
pressure with direct action (or increasing pressure
with reverse action) produces a nozzle−flapper
opening that bleeds off pressure on the large relay
diaphragm and opens the relay valve to exhaust
controller output pressure from the actuator.

This controller output pressure change feeds back to
the proportional bellows, countering the pressure
change in the nozzle and equalizes the relay
diaphragm pressure differential. The relay valve
maintains a new loading pressure according to the
change in sensed pressure.

If the proportional band adjustment is at its
maximum setting (10), the cantilever spring in the
proportional band assembly has a low spring rate,
allowing more feedback motion to be transferred
from the proportional bellows for a change in output
pressure. As the effective length of the cantilever is
reduced, its spring rate increases, causing less
feedback motion from proportional bellows. Setting
the cantilever spring to its maximum length results in
a proportional band of 100%. The lower the

21

Instruction Manual

C1 Controllers and Transmitters

CONSTANT SUPPLY
PRESSURE

EXHAUST

RESET BELLOWS

TO FINAL
CONTROL
ELEMENT

ARROW UP−RELIEVES

ON INCREASING OUTPUT

(OUTPUT AT ZERO

DURING SHUTDOWN)

RESTRICTION

PRESSURE
SETTING KNOB

PRESSURE
SETTING DIAL

PROPORTIONAL
BAND ADJUSTMENT
KNOB

September 2009

ARROW DOWN−RELIEVES
ON DECREASING OUTPUT

(OUTPUT AT SUPPLY
DURING SHUTDOWN)

DIFFERENTIAL
RELIEF VALVE

SENSED
PRESSURE

SENSED PRESSURE OUTPUT PRESSURE NOZZLE PRESSURE RESET PRESSURE

GE23697−A
GE34724−A
E1063

Figure 14. Schematic of Reverse−Acting Proportional−Plus−Reset Controller with Anti−Reset Windup

proportional band adjustment, the shorter the
effective length of the cantilever spring. The spring
rate of the cantilever spring increases as its length
shortens, allowing less motion to be transferred from
the bellows to the beam and flapper for a given
change in output pressure.

Proportional−Plus−Reset Controllers

Action of a proportional−plus−reset controller is
similar to that of a proportional−only controller
except that feedback from the controller output
pressure is piped to a reset bellows as well as to the
proportional bellows as shown at the right in
figure 13.

With an increasing controller output pressure,
pressure in the reset bellows increases. Increases in

CANTILEVER
SPRING

PROPORTIONAL
BELLOWS

RESET VALVE

reset bellows pressure moves the beam and flapper
closer to the nozzle, starting another increase of
pressure throughout the system. Pressure buildup
continues until the controlled pressure is brought
back to the set point. The reset valve is adjustable to
vary the amount of delay in the reset action. Closing
the reset valve increases the delay in reset action.

Controllers with Anti−Reset Windup

During a prolonged difference between set point and
the controlled variable, such as encountered with
intermittent control applications (e.g., batch
temperature control or wide open monitors on
pressure control), reset ramps the controller output
to either zero or full supply pressure; this condition is
reset windup. When the controlled variable crosses
the set point, there will be a delay before the

22

Instruction Manual

September 2009

controller output responds to the change in
controlled variable. Anti−reset windup minimizes this
delay and permits returning the controlled variable to
set point more quickly with minimal overshoot.

As shown in figure 14 a proportional−plus−reset
controller with anti−reset windup includes a
differential relief valve. The valve consists of two
pressure chambers separated by a spring−loaded
diaphragm.

For the controller shown in figure 14, proportional
pressure registers rapidly on the spring side of the
relief valve diaphragm as well as in the proportional
bellows, and reset pressure registers on the
opposite side of the relief valve diaphragm. As long
as controlled pressure changes are slow enough for
normal proportional and reset action, the relief valve
spring will keep the relief valve diaphragm from
opening. However, a large or rapid decrease in
controller pressure will cause the relay to exhaust
loading pressure from the control device rapidly, and
also from the proportional system and spring side of
the relief diaphragm. If this decrease on the spring
side of the diaphragm is greater than the relief valve
spring setting, the diaphragm will move off the relief
valve orifice and permit the proportional pressure on
the opposite side of the relief valve diaphragm to
bleed rapidly into the reset bellows. The anti−reset
windup action also can be reversed to relieve with
an increasing proportional pressure.

Differential Gap Controllers

With a differential gap controller, feedback pressure
does not counteract the change in flapper position
as it does in a proportional−only controller. Instead,
feedback pressure is piped to the bellows located on
the side of the beam and flapper opposite the nozzle
(the proportional bellows in figure 13). Then, as
controller output pressure increases, feedback
pressure moves the flapper closer to the nozzle to
again increase controller output pressure. This
process continues rapidly until the controller output
pressure is at the upper range limit. The action of a
differential gap controller is so rapid that output
pressure changes from zero to maximum as soon as
the switching point is reached. The action is similar
with falling output pressure. Lower feedback
pressure lowers the bellows pressure, which moves
the flapper away from the nozzle. This again
reduces the output pressure and continues until the
output pressure is zero.

C1 Controllers and Transmitters

Transmitters

Action of a pneumatic transmitter is similar to that of
a proportional−only controller. Since the output
pressure of the transmitter has no effect on the
process pressure, transmitter output pressure is a
proportional measure of the process pressure. The
proportional band adjustment determines the span of
the transmitter, and the pressure setting mechanism
determines the zero of the transmitter.

Maintenance

If the installation includes a Fisher 67 Series filter
regulator, periodically open the drain on the filter
regulator to drain accumulated moisture. Also, push
the spring−out cleaning wire on the relay orifice.
Check the opening of the vent assembly (key 28,
figure 2) or the opening of the remote vent pipe, if
one is used. If necessary, clean the openings.

Parts are subject to normal wear and must be
inspected and replaced as necessary. The
frequency of inspection and parts replacement
depends upon the severity of the service conditions.

WARNING

The following maintenance procedures
require taking the controller out of
service. To avoid personal injury and
property damage caused by the
release of pressure or process fluid,
observe the following before starting
maintenance:

D Always wear protective clothing,

gloves, and eyewear.

D Provide some temporary means
of control for the process before
taking the controller out of service.

D Provide a means of containing the
process fluid before removing any
measurement devices from the
process.

D Use lock−out procedures to be
sure that the above measures stay in
effect while you work on the
equipment.

D Personal injury or property
damage may result from fire or
explosion if natural gas is used as the
supply medium and appropriate

23

Instruction Manual

C1 Controllers and Transmitters

preventative measures are not taken.
Preventative measures may include,
but are not limited to, one or more of
the following; Remote venting of the
unit, re−evaluating the hazardous area
classification, ensuring adequate
ventilation, and the removal of any
ignition sources. For information on
remote venting of this controller/
transmitter, refer to page 8.

D Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.

Replacing Gauges

Refer to figures 21 and 22 for key number locations
unless otherwise directed.

Three gauge configurations are available for C1
units.

D Output and supply pressure indications

September 2009

correct range so they are not damaged
by overpressure.

Note

Key 2 is used as both a supply gauge
and an output gauge on units without
a process pressure gauge. A quantity
of 2 is required for these units. On
units with a process pressure indicator
gauge (key 4), key 2 is used for the
output gauge. A quantity of 1 is
required for these units.

Use key 3 for supply pressure
indication when a process pressure
gauge is installed. Key 3 installs on the
supply pressure regulator.

1. Shut off the supply pressure and process lines to
the controller or transmitter.

2. Remove the gauge to be replaced:
D Unscrew the output or supply gauge (key 2)

from the relay base.

D Output and process pressure indications

D Output, process, and supply pressure

indications
One gauge type (key 2) is used for both output and

supply pressure indications when the gauges are
installed inside the controller case. Key 2 features a
1/8−inch connecting stem that matches the threaded
gauge boss extending from the relay base.

In some cases, a process pressure gauge (key 4)
covers the position of the internal supply pressure
gauge. The supply pressure gauge has been
removed and replaced with a pipe plug (key 15). The
pressure control block (key 10) is different to
accommodate a different control tubing assembly
(key 23) with a pressure connection (key 14) for a
process pressure gauge. If a supply pressure gauge
is required, a gauge with a 1/4−inch connecting stem
(key 3) must be mounted on the supply pressure
regulator.

CAUTION

Before performing this procedure, be
sure the replacement gauges are the

D Unscrew the process pressure gauge (key 4)

from the process connection (key 14).

D Unscrew the supply gauge (key 3) from the

supply pressure regulator.

3. Coat the threads of the replacement gauge with a

sealant.

4. Screw the replacement gauge into the relay base,

process connection, or supply pressure regulator.

5. Check for leaks by applying the correct supply

pressure with the nozzle capped to produce full
output pressure.

Replacing Bourdon Tube

Refer to figure 23 for key number locations unless
otherwise directed.

1. Shut off the supply pressure and process lines to

the controller or transmitter.

2. Unscrew the machine screw (key 56) to

disconnect the link (key 16) and bearing (key 31)
from the beam (key 39). Be careful to avoid losing
the bearing (key 31). Washer(s) (key 62) for the
machine screw (key 56) are at times furnished for
insertion at the beam (key 39) connection to ensure
alignment of the connecting link (key 16).

24

Instruction Manual

September 2009

PROPORTIONAL TUBING

RELAY TUBING

(KEY 24)

FLAPPER/SCREW
(KEYS 40 AND 46)

REVERSE

ACTING POSITION

REVERSING BLOCK

GE28263−A
E1064

(KEY 37)

RESET VALVE

(KEY 256)

(KEY 25)

REVERSE ACTING

C1 Controllers and Transmitters

PROPORTIONAL TUBING

RELAY TUBING

REVERSING BLOCK

PROPORTIONAL
BAND ASSY

BELLOWS
(KEY 52)

DIRECT ACTING POSITION

FLAPPER/SCREW
(KEYS 40 AND 46)

PROPORTIONAL-ONLY CONTROLLER OR TRANSMITTER

(KEY 24)

(KEY 37)

RESET VALVE

(KEY 256)

(KEY 25)

DIRECT ACTING

BELLOWS
(KEY 52)

PROPORTIONAL
BAND ASSY

RESET TUBING

RELAY TUBING

FLAPPER/SCREW
(KEYS 40 AND 46)

REVERSE ACTING

POSITION

REVERSING BLOCK

GE34722−A
E1065

(KEY 37)

(KEY 24)

REVERSE ACTING

(KEY 27)

PROPORTIONAL TUBING
(KEY 27)

PROPORTIONAL
BAND ASSY

BELLOWS
(KEY 52)

PROPORTIONAL-PLUS-RESET CONTROLLER

Figure 15. Reverse/Direct Acting Tubing Connections for Proportional Controllers or Transmitter

3. Disconnect the control tubing (key 23, figure 22).
Unscrew the two screws (key 55) and washers
(key 45), and remove the Bourdon tube (key 5).

4. Unscrew the machine screw (key 56), and
remove the link and bearing (keys 16 and 31) from
the Bourdon tube. Be careful to avoid losing the
bearing.

5. Attach the link and bearing to the replacement
Bourdon tube.

6. Attach the Bourdon tube with two machine
screws and washers (keys 55 and 45).

RELAY TUBING

(KEY 24)

REVERSING BLOCK

(KEY 37)

DIRECT ACTING

POSITION

FLAPPER/SCREW
(KEYS 40 AND 46)

RESET TUBING
(KEY 27)

PROPORTIONAL TUBING
(KEY 27)

BELLOWS
(KEY 52)

PROPORTIONAL BAND ASSY

DIRECT ACTING

7. Connect the link and bearing to the beam

(key 39).

8. After connecting the link to the beam, make sure

that the link is parallel to the sensing element (key 5)
and the beam (key 39) so that it does not bind
against the sensing element of the beam. Figure 17
shows a properly aligned connecting link; the
connecting link is not in contact with the Bourdon
tube or or washers. When properly configured, the
connecting link moves freely when touched.
Washers (key 62) are used as shims to set
parallelism.

25

Instruction Manual

C1 Controllers and Transmitters

PROPORTIONAL TUBING

RELAY TUBING

(KEY 24)

FLAPPER/SCREW
(KEYS 40 AND 46)

REVERSE ACTING

POSITION

REVERSING BLOCK

GE34724−
A
E1066

(KEY 37)

Figure 16. Reverse/Direct Acting Tubing Connection for Differential Gap Controller

9. Check to be sure that the beam is parallel with
the bottom of the case and that the link (key 16) is in
tension. If the beam is not parallel with the case,
loosen the machine screws (key 55), reposition the
Bourdon tube to get the beam parallel, and retighten
the screws.

10. If a Bourdon tube with a different range was
installed, remove the machine screw and washer
(keys 61 and 60) and dial (key 6). Install a new dial
having an adjustment range corresponding to the
range of the Bourdon tube. If an optional process
pressure gauge (key 4, figure 21) is being used,
install a new gauge with the appropriate
measurement capability.

11. Check all tubing connections for leaks and the
Bourdon tube machine screws, tighten as
necessary. Perform the appropriate calibration
procedures.

(KEY 25)

REVERSE ACTING

BELLOWS
(KEY 52)

PROPORTIONAL BAND ASSY

DIFFERENTIAL-GAP CONTROLLER

September 2009

RELAY TUBING

(KEY 24)

REVERSING BLOCK

(KEY 37)

DIRECT ACTING
POSITION

FLAPPER/SCREW
(KEYS 40 AND 46)

PROPORTIONAL TUBING

(KEY 25)

DIRECT ACTING

PROPORTIONAL BAND
ASSY

BELLOWS
(KEY 52)

block (key 8, figure 21) to the bellows assembly
(key 71), at the pressure block end.

3. Unscrew the four machine screws (key 41,

figure 21 or 22), and remove the pressure sensing
subassembly from the case.

4. Remove the bellows yoke machine screws and

washers (keys 98 and 99), and move the bellows
yoke to the right to permit access to the link screw.

5. Disconnect the link (key 71M) and bearing

(key 71L) from the beam. Be careful to avoid losing
the bearing.

6. Loosen the nuts that secure the bellows

assembly (key 71), and remove this assembly from
the bellows yoke (key 100).

7. For a gauge−pressure sensing element (only one

bellows in the assembly), install the proper bellows
spring (key 104) into the bellows assembly if the
input signal range is being changed.

Replacing Bellows Sensing Element

Refer to figure 24 for key number locations unless
otherwise directed.

1. Shut off the supply pressure and process lines to
the controller or transmitter.

2. Disconnect the tubing from the mounting base
(key 57) and calibration adjuster (key 36).
Disconnect the tubing that connects the pressure

26

8. Install the new bellows assembly into the bellows

yoke.

9. Attach the link and bearing to the bellows

assembly. Position the bellows yoke (key 100) on
the mounting base (key 57), and attach the link and
bearing to the beam. Start but do not tighten the four
machine screws (key 98) with washers (key 99) that
attach the yoke to the mounting base. Slide the yoke
up or down as necessary to position the beam
horizontally, as shown in figure 24. Tighten the
machine screws.

Instruction Manual

September 2009

BOURDON TUBE
(KEY 5)

LINK BEARING
(KEY 31)

WASHER (QTY 2)
(KEY 62)

BEAM
(KEY 39)

CONNECTING LINK
(KEY 16)

BINDING CONNECTING LINK

(IMPROPERLY ALIGNED)

GE37119

Figure 17. Connecting Link

10. Replace the subassembly in the case and
secure with the four machine screws (key 41,
figure 21 or 22). Reconnect all tubing.

11. If a bellows assembly with a different range is
installed, remove the machine screw and washer
(keys 61 and 60) and dial (key 6), and install a new
dial having an adjustment range corresponding to
the range of the bellows. If an optional process
pressure gauge (key 4, figure 21) is being used,
install a new gauge with the appropriate
measurement capability.

12. Check all tubing connections for leaks and the
bellows yoke machine screws, tighten as necessary.
Perform the appropriate calibration procedures.

C1 Controllers and Transmitters

BOURDON TUBE
(KEY 5)

WASHER
(KEY 62)

LINK BEARING
(KEY 31)

WASHER
(KEY 62)

BEAM

PROPERLY ALIGNED

CONNECTING LINK

3. Refer to figure 14. Install the replacement relief

valve with the arrow positioned so that the controller
output will be as noted in step 1 when the process is
shut down.

Changing Action

Proportional−Only to a Differential Gap
Controller

A proportional−only controller may be changed to a
differential gap controller, or vice versa, by changing
the position of the proportional tubing and inverting
the proportional band assembly.

(KEY 39)

CONNECTING
LINK (KEY 16)

Changing Reset Valve

1. Disconnect the appropriate tubing and remove
the reset restriction valve assembly (key 256,
figure 22) by removing the screw (key 22, not
shown) from the back of the case. Install the desired
replacement assembly.

2. Connect the tubing, check all connections for
leaks and perform the appropriate calibration
procedures.

Changing Anti−Reset Windup
Differential Relief Valve

Refer to figure 23 for key number locations.

1. Note the controller output pressure (zero or
supply) when the process is shut down.

2. Remove the differential relief valve assembly.

1. Isolate the controller or transmitter from process,

control, and supply pressure. Vent any trapped
pressure from the controller or transmitter before
proceeding with the following steps.

2. Disconnect the proportional tubing (key 25,

figure 16) from the mounting base (key 57, figure 23
or 24) and reinstall it in the other connection in the
mounting base.

3. Do not invert the reversing block unless also

changing the controller action from direct to reverse
(or vice versa).

4. Invert the proportional band assembly (refer to

figure 18):

a. Turn the proportional band adjustment knob
(key 73) to 10.

b. Unscrew the spring adjustor (key 65),
removing the bias spring (key 70) and washers
(key 64) with it.

27

Instruction Manual

C1 Controllers and Transmitters

PROPORTIONAL BAND ADJUSTMENT KNOB

CANTILEVER SPRING

SPRING ADJUSTOR

GE34725−A
E1067

c. Unclip the lock spring (key 72). Remove the
indicator scale (key 69) and proportional band
adjustment knob (key 73).

d. Remove the gain adjustment bar (key 63). Flip
it over so it attaches to the opposite side of the
cantilever spring (key 8), as shown in figure 16,
and screw it back down.

e. Flip over the indicator scale (key 69); install it
and the proportional band adjustment knob
(key 73) as a unit. Snap in the lock spring
(key 72).

f. Tighten down the spring adjustor (key 65) with
the bias spring (key 70) and washers (key 64)
until it stops against the gain adjustment bar
(key 63).

g. Turn the proportional band adjustment knob to
the 10 setting. If it cannot be turned to the 10
setting loosen the spring adjustor (key 63).

5. Check all connections for leaks with a
soap−and−water solution. Perform the appropriate
calibration procedure.

(KEY 73)

LOCK SPRING

(KEY 72)

(KEY 8)

BIAS SPRING

(KEY 70)

WASHER

(KEY 64)

(KEY 65)

Figure 18. Proportional Band Assembly

September 2009

MACHINE SCREW
(KEY 56)

INDICATOR SCALE
(KEY 69)

MACHINE SCREW
(KEY 74)

GAIN ADJUSTMENT BAR
(KEY 63)

and 19 for key number locations unless otherwise
directed.

1. Isolate the controller or transmitter from process,

control, and supply pressure. Vent any trapped
pressure from the controller or transmitter before
proceeding with this procedure.

2. As shown in figure 15, locate the new tubing,

proportional band assembly, and reversing block
positions for the desired action.

3. Locate the two bellows (key 52), the proportional

band assembly (see figure 15), and the reversing
block (key 37).

4. Disconnect the tubing (refer to figure 15):

a. For a proportional−only controller or for a
transmitter, disconnect the proportional tubing
(key 25) from the mounting base and reconnect
them on the opposite side.

b. For a proportional−plus−reset controller,
disconnect the proportional tubing (key 27) and
reset tubing (key 27) from the mounting base and
reconnect them on the opposite side.

5. Invert the proportional band assembly (refer to

figure 18):

Reverse to Direct Action

Use the numbered steps below to change from
reverse action (increasing process pressure
produces decreasing output pressure) to direct
action (increasing process pressure produces
increasing output pressure), or vice versa. Changing
the action is accomplished by reversing the positions
of the reversing block, proportional band assembly,
and bellows tubing(s). Refer to figures 15, 16, 18,

28

a. Turn the proportional band adjustment knob
(key 73) to 10.

b. Unscrew the spring adjustor (key 65),
removing the bias spring (key 70) and washers
(key 64) with it.

c. Unclip the lock spring (key 72). Remove the
indicator scale (key 69) and proportional band
adjustment knob (key 73).

Instruction Manual

September 2009

OUTER FLEXURE

(KEY 68)

MACHINE SCREW

(KEY 51)

MACHINE SCREW

(KEY 51)

BEAM

(KEY 39)

GE34726−B
E1068

Figure 19. Beam/Cantilever Spring Assembly

d. Remove the gain adjustment bar (key 63). Flip
it over so it attaches to the opposite side of the
cantilever spring (key 8) as shown in figure 15
and re−attach.

e. Flip over the indicator scale (key 69, figure

18); install it and the proportional ban knob (key

73) as a unit. Snap in the lock spring (key 72).

f. Tighten down the spring adjustor (key 65) with
the bias spring (key 70) and washers (key 64)
until it stops against the gain adjustment bar
(key 63).

g. Turn the proportional band adjustment knob to
the 10 setting. If it cannot be turned, loosen the
spring adjustor (key 65).

6. Change the reversing block assembly (figure 15
or 16, key 37):

a. Remove the sealing screw (key 49, figure 23
or 24). Inspect the O−ring (key 77 located in the
recessed area under the sealing screw head.
Replace the O−ring if necessary.

b. Remove the reversing block screw (key 50,
figure 23 or 24) and reversing block assembly
(key 37). Inspect the O−rings (key 77) located in
the recessed area under the reversing block
screw head and between the reversing block
assembly and the calibration adjuster (key 36).
Replace these O−rings if necessary.

C1 Controllers and Transmitters

BELLOWS SPACER
(KEY 34)

c. Position the reversing block assembly, with an
O−ring, on the calibration adjuster (key 36) so
that the nozzle is on the opposite side of the
beam (key 39) from which it was removed.
Position the reversing block hole in the calibration
adjuster. Install the reversing block screw (key

50) with an O−ring (key 77).
d. Install the sealing screw (key 49) with an

O−ring in the hole previously covered by the
reversing block assembly.

7. Check all connections for leaks with a

soap−and−water solution. Perform the appropriate
calibration procedures.

Relay Replacement

Key numbers used in this procedure are shown in
figure 21 or 22 except where indicated.

1. Shut off the supply pressure and process

pressure line(s) to the controller or transmitter.

2. Disconnect the tubing (key 24) from the relay.

3. Unscrew the output or supply pressure gauge

(key 2).

4. To remove the relay assembly, unscrew two

Phillips−head machine screws (key 29, not shown)
located behind the relay on the back of the case.

5. Remove the relay gasket (key 19, figure 21).

6. A new relay can be installed as a replacement. If

a new relay is being installed, continue with the next
step.

INNER FLEXURE
(KEY 67)

CANTILEVER SPRING
(KEY 8)

29

Instruction Manual

C1 Controllers and Transmitters

7. Attach the replacement relay and new relay
gasket with machine screws inserted through the
back of the case. Reinstall the output or supply
gauge.

8. Connect the tubing, and check all connections for
leaks. Perform the appropriate calibration
procedures.

Changing Output Signal Range

Use the following information and subsequent
procedures when changing the output signal range
of the controller or transmitter. Use the following
procedure:

D For a controller or transmitter, use this
procedure to change from a 0.2 to 1.0 bar (3 to 15
psig) to a 0.4 to 2.0 bar (6 to 30 psig) output signal
range or vice versa.

D For a differential gap controller, use this
procedure to change from a 0 and 1.4 bar (0 and 20
psig) to a 0 and 2.4 bar (0 and 35 psig) output signal
range or vice versa.

D When changing the supply pressure source to
a new range, refer to table 5 for supply pressure
requirements for the output signal range selected.

Also, make appropriate changes to the nameplate of
the controller or transmitter, reflecting the new range
selections. Refer to figure 23 or 24 for key number
locations unless otherwise directed.

1. Shut off the supply pressure and process lines to
the controller or transmitter.

2. Disconnect the tubing from the mounting base
(key 57) and calibration adjuster (key 36).

Disconnect the tubing that connects the pressure
block (key 10, figure 21 or 22) to the Bourdon tube
or bellows assembly (key 5 or 52), at the pressure
block end.

September 2009

O−RING
(KEY 77)

A6281−1 / IL

Figure 20. Bellows Screw Detail

Note

The bellows screws (key 53) have an
O−ring (key 77, figure 20) installed
beneath the bellows screw head.
Remove the O−ring and obtain a
replacement when re−assembling the
bellows.

6. Unscrew the spring adjustor (key 65). Unclip the
lock spring (key 72, figure 18) and remove the
indicator scale (key 69) and the proportional band
adjustment knob (key 73).

7. Compress the bellows (key 52) so that the end of
the bellows, beam (key 39), and cantilever spring
(key 8) can be removed from the mounting base
(key 57).

8. Unscrew the bellows (key 52) from the
bellows/cantilever assembly.

9. Remove the cantilever spring from the spacer
(key 34).

a. Remove the beam machine screws (figure 19,
step 4).

b. Remove the cantilever machine screws
(figure 19, step 3).

3. Unscrew the machine screws (key 41, figure 21
or 22), and remove the subassembly from the case.

4. If the controller or transmitter uses a Bourdon
tube sensing element disconnect the Bourdon tube
from the beam (key 39) by removing the screw
(key 56). Be careful to avoid losing the bearing
(key 31). Unscrew the machine screws (key 55)
and remove the washers and Bourdon tube (keys 45
and 5).

5. Unscrew the bellows screws (key 53) from each
end of the mounting base (key 57).

30

c. Remove the inner flexure (figure 19, step 1)
and install it on the new cantilever.

10. Install the new cantilever spring (key 8) and
reconnect the beam (key 39) to the bellows spacer
(key 34) in reverse sequence of steps 9a. and 9b.
and reattach the bellows to the beam/cantilever
assembly.

11. Compress the bellows and install them into the
mounting base (key 57). Align the cantilever spring
with the gain adjustment bar (key 63). Install the
indicator scale (key 69) and the proportional band

Instruction Manual

September 2009

adjustment knob (key 73) as a unit. Snap the lock
spring (key 72) onto the indicator scale.

12. Install the spring adjustor (key 65, figure 18)
with washers (key 64, figure 18) on either side of the
bias spring (key 70, figure 18). Tighten down the
spring adjustor until it stops against the gain
adjustment bar (key 63).

13. Turn the proportional band adjustment knob
to 10. If it cannot be turned to 10 loosen the spring
adjustor (key 65).

14. Secure the bellows (key 52) with the bellows
screws (key 53), making sure that the nozzle
(key 54) is centered on the flapper (key 40).

15. Unscrew the supply and output gauges
(figure 21 or 22, key 2) and install new gauges with
correct ranges.

16. Replace the subassembly in the case and
secure with machine screws (figure 21 or 22,
key 41). Re−install the Bourdon tube if it was
removed; refer to the Replacing the Bourdon Tube
section. Reconnect all tubing.

17. Check all tubing connections and the bellows
machine screws for leaks; tighten as necessary.
Perform the appropriate calibration procedures.

C1 Controllers and Transmitters

WARNING

Neither Emerson, Emerson Process
Management, nor any of their affiliated
entities assumes responsibility for the
selection, use, or maintenance of any
product. Responsibility for the
selection, use, and maintenance of any
product remains with the purchaser
and end−user.

Parts Kits

Description Part Number
Controller Repair Kits

Kit includes Gasket, Relay Gasket, Bellows Frame

Gasket, and keys 16, 20, 21, 31, 37, 38, 40, 46, 49,

50, 54, 62, 75, 76, and 77

Note

Keys 71K, 71L, and 71M may also be
necessary for repair of C1B and C1D
controllers. Refer to the Common Parts
section for part numbers.

Parts Ordering

Whenever corresponding with your Emerson
Process Management sales office about this
equipment, mention the serial number of the unit.
The serial number can be found on the nameplate
(key 22, figure 21). When ordering replacement
parts, also state the complete 11−character part
number of each part required as found in the
following parts list.

WARNING

Use only genuine Fisher replacement
parts. Components that are not
supplied by Emerson Process
Management should not, under any
circumstances, be used in any Fisher
instrument. Use of components not
supplied by Emerson Process
Management may void your warranty,
might adversely affect the
performance of the instrument, and
could cause personal injury or
property damage.

Standard Temperature RC100X00L12
High Temperature RC100X00H12

Relay Replacement Kits

Kit includes keys 19 and 29, the replacement relay, and

2 Machine Screws

Standard Temperature RRELAYX0L22
High Temperature RRELAYX0H22

Case Assembly Seal Kit

Kit includes 3 Manifold Seals, 1 Manifold Cover,

and 10 Mounting Screws RC100X00012

Parts List

Common Parts (Figures 21, 22, 23, and 24)

Key Description Part Number

Note

Part numbers are shown for recommended
spares only. For part numbers not shown,
contact your Emerson Process Management
sales office.

1 Case and Cover Assembly, aluminum

31

Instruction Manual

C1 Controllers and Transmitters

Key Description Part Number

Note

Key 2 is used as both a supply gauge and an
output gauge on units without a process
pressure gauge. A quantity of 2 is required
for these units. On units with a process
pressure gauge (key 106), key 2 is used for
the output gauge. A quantity of 1 is required
for these units.

Use key 3 for supply pressure indication
when a process pressure gauge is installed.
Key 3 installs on the supply pressure
regulator.

2* Supply and Output Pressure Gauge, w/o process

pressure gauge (1/8−inch connecting stem), (2 req’d)

Dual scale

Brass/Plastic

0−2.0 kg/cm2 and 0−30 psig 11B8577X042
0−4.0 kg/cm2 and 0−60 psig 11B8577X052

SST

0−2.0 kg/cm2 and 0−30 psig 11B8583X032
0−4.0 kg/cm2 and 0−60 psig 11B8583X052

Triple scale

Brass/Plastic

0−2.0 bar, 0−0.2 MPa, and 0−30 psig 11B8577X012
0−4.0 bar, 0−0.4 MPa, and 0−60 psig 11B8577X022

SST

0−2.0 kg/cm2 and 0−30 psig 11B8583X012
0−4.0 kg/cm2 and 0−60 psig 11B8583X022

2* Output Pressure Gauge, w/process pressure

gauge (1/8−inch connecting stem), Brass/Plastic

Triple scale

0−2.0 bar, 0−0.2 MPa, and 0−30 psig 11B8577X012
0−4.0 bar, 0−0.4 MPa, and 0−60 psig 11B8577X022

3* Supply Pressure Gauge, w/process pressure

gauge (1/4−inch connecting stem), Brass/Plastic

Triple scale

0−2.0 bar, 0−0.2 MPa, and 0−30 psig 11B8579X022
0−4.0 bar, 0−0.4 MPa, and 0−60 psig 11B8579X032

Note

Controllers with bellows sensing element
use only the 2.0 bar, 0 to 0.2 MPa, and 0 to 0
to 30 psig triple scale brass and stainless
steel process pressure gauges. Differential
pressure controllers do not use a process
pressure gauge.

4* Process Pressure Indicator Gauge (use only when specified)

Triple scale

Stainless steel

0−2.0 bar, 0−0.2 MPa, and 0−30 psig 11B8584X022
0−20 bar, 0−2.0 MPa, and 0−300 psig 11B8584X012
0−69 bar, 0−6.9 MPa, and 0−1000 psig 11B8584X032

High Temp, silicone 1N873804142

September 2009

Key Description Part Number

8* Cantilever Spring, S30200

3−15 psi range GE31702X012
6−30 psi range GE31701X012

9 Nameplate, aluminum

10 Control Pressure Block

For gauge pressure instruments

w/o process pressure gauge

CF8M FMS 20B58 for standard, NACE and oxygen service

w/process gauge

11 Plug, S31600 (not shown)

12 Machine Screw, steel pl (4 req’d)
13 Lockwasher, steel pl/zn pl (4 req’d)

14 Pressure Connection, S31600

15 Pipe Plug, steel pl (not shown)

16* Connecting Link

16 Connecting Link, Bourdon tube w/optional travel stop,

17 Lockwasher, steel pl (2 req’d)

18 Machine Screw, steel pl (2 req’d)

19* Relay Gasket

20* O−Ring
21* Gasket

22 Mounting Screw for reset restriction valve

23* Control Tubing Assembly, 304 SST

23 Control Tubing Assembly, SST/vinyl

24* Relay Tubing Assembly, 304 SST GE33948X012

SST

used with gauge pressure only

1 req’d for standard/NACE
2 req’d for oxygen service

Use w/process gauge

Use w/process gauge, not used w/Bourdon tube protector

(1)

Std., 18−8 SST 1L379641012

18−8 SST

Use w/optional Bourdon tube travel stop

Use w/optional Bourdon tube travel stop

Std Temp, chloroprene 1C897403012
Hi Temp, silicone 1N873804142

(1)

(1)

1/4−20 UNC, steel pl (not shown)

For Bourdon tube instruments

w/o process pressure gauge

NACE 1H3011000A2
Oxygen Service 1H3011X0012
w/process pressure gauge 1J2530000A2

used with NACE compliant Bourdon tube

, Bourdon tube instruments only

(1)

, nitrile 1C376206992

, chloroprene, (not shown) 1C328603012

5* Bourdon Tube See following table
6 Dial, aluminum
7 Screw, nylon (transmitters only)

32

25* Compensator Tubing, 304 SST GE28421X012

26* Reset Tubing, 304 SST GE30128X012

*Recommended spare parts

1. This part is included in the Controller Repair Kit.

Instruction Manual

September 2009

NOTE:
KEYS 11, 21, AND 29 ARE NOT SHOWN

GE34729−B
GE31719−A
E1069

TRANSMITTER

C1 Controllers and Transmitters

SPRING−OUT CLEANING WIRE

RELAY ASSEMBLY

OPTIONAL PROCESS PRESSURE INDICATION

SUBASSEMBLY
(KEY NOS. SHOWN
IN FIGURE 23 OR 24)

Figure 21. Typical Reverse Acting Fisher C1 Assembly

(Refer to figure 25 for the Front View of the Case & Cover Assembly)

Key 5* Bourdon Tube

PRESSURE RANGE MATERIAL

kPa Psig Stainless Steel

0−200
0−200
0−400
0−400
0−700

0−700
0−1400
0−1400

0−2000
0−2000
0−4000
0−4000
0−7000
0−7000

0−10,000
0−20,000

0−35,000
0−55,000
0−70,000

1. Bourdon tubes are also available in NACE compliant material. Contact your Emerson Process Management sales office for additional information.

2. For oxygen service.

0−30
0−30
0−60

0−60
0−100
0−100
0−200
0−200

0−300
0−300
0−600
0−600

0−1000
0−1000
0−1500
0−3000

0−5000
0−8000

0−10,000

32B1243X012
32B1243X212
32B1243X022
32B1243X172
32B1243X032
32B1243X202
32B1243X042
32B1243X162

32B1244X052
32B1244X152
32B1244X062
32B1244X182
32B1244X072
32B1244X192
32B1245X082
32B1245X092

32B1245X102
32B1245X112
32B1245X122

(1)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

*Recommended spare parts

33

Instruction Manual

C1 Controllers and Transmitters

NOTE:
KEYS 11, 21, 29 ARE NOT SHOWN

GE28280−B

Figure 21. Typical Reverse Acting Fisher C1 Assembly (continued)

(Refer to figure 25 for the Front View of the Case & Cover Assembly)

PROPORTIONAL-ONLY CONTROLLER

SPRING−OUT CLEANING WIRE
RELAY ASSEMBLY

SUBASSEMBLY (KEY NOS.
SHOWN IN FIGURE 23 OR 24)

September 2009

Key Description Part Number

27* Compensator Tubing, 304 SST (2 req’d) GE29222X012

28 Vent Ass’y
29 Machine Screw

(2)

, 18−8 SST (not shown) (2 req’d)

30 NPT Adaptor, aluminum

31* Link bearing

(1)

, S41600

Bourdon tube instruments only (2 req’d) 1L379546202

32 Rotary Spring, S30400
33 Bellows Stud, brass (not shown)

34 Spacer,
35 Pressure Set Arm, G10080 carbon steel, zinc pl
36 Calibration Adjuster
37 Reversing Block
38 Sleeve

(1)

39 Beam, G10080 carbon steel, zinc pl
40 Flapper

(1)

, Z33520 zinc die casting

, POM (polyoxymethylene)

(1)

, S30100 SST

41 Machine Screw, steel pl (4 req’d)

Key Description Part Number

42 Flexure Strip, S30200
43 Flexure Strip Washer, G10200 carbon steel (2 req’d)

44 Washer, 18−8 SST (2 req’d)
45 Washer, steel pl (2 req’d)
46 Machine Screw

(1)

, steel pl

47 Machine Screw, steel pl (4 req’d)
48 Machine Screw, 18−8 SST (2 req’d)
49 Sealing Screw
50 Reversing Block Screw

(1)

, SST

(1)

, SST

51 Cap Screw, 18−8 SST (8 req’d)
52* Reversing Bellows Ass’y, SST (2 req’d) 14A5725X022
53 Bellows Screw, 18−8 SST (2 req’d)
54* Nozzle

(1)

, SST 1U639135132
55 Machine Screw, steel pl (2 req’d)
56 Machine Screw, 18−8 SST (4 req’d)

57 Mounting Base, aluminum

34

*Recommended spare parts

1. This part is included in the Controller Repair Kit.

2. This part is included in the Relay Replacement Kit.

Instruction Manual

September 2009

NOTE:
KEYS 11, 21, 22, 29 ARE NOT SHOWN

GE28281−B
E1071

C1 Controllers and Transmitters

SPRING−OUT CLEANING WIRE

RELAY ASSEMBLY

SUBASSEMBLY (KEY NOS.
SHOWN IN FIGURE 23 OR 24)

PROPORTIONAL-PLUS-RESET CONTROLLER

WITHOUT ANTI-RESET WINDUP

Figure 22. Typical Reverse Acting Fisher C1 Proportional−Plus−Reset Assembly

(Refer to figure 25 for the Front View of the Case & Cover Assembly)

Key Description Part Number

58 Knob, PPS (polyphenylene sulfide)
59 Knob Spring, steel/zinc pl

60 Washer, G10100 carbon steel, zinc pl
61 Machine Screw, steel pl
62 Washer

63 Gain Adj Bar, A03600
64 Washer, 18−8 SST (2 req’d)

65 Spring Adjustor, 18−8 SST

66 Travel Stop Assembly, SST

67* Inner Flexure, S30200 GE26663X012

68* Outer Flexure, S30200 GE26664X012
69 Indicator Scale, aluminum
70 Bias Spring, S30200

(1)

, brass/zinc pl (2 req’d)

Use w/optional Bourdon tube travel stop

Key Description Part Number

71* Gauge Pressure Bellows (input)

(3)

Brass

0−150 mbar (0−60 inches wc) positive, 0−150 mbar

(6−60 inches wc) vacuum, and 75−0−75 mbar

(30−0−30 inches wc) compound 1L3780000A2
0−250 mbar (0−100 inches wc) positive 1L3788000A2
0−0.35 mbar (0−5 psig) positive and for

0−350 mbar (0−10 inches Hg) vacuum 1L3781000A2
0−0.5 bar (0−7.5 psig) positive 1L3789000A2
0−0.7 bar (0−10 psig) positive 1L3782000A2
0−1.0 bar (0−15 psig) positive, 0−1.0 bar

(0−30 inches Hg) vacuum, and 500−0−500 mbar

(15−0−7.5 psig) compound 1L3783000A2
0−1.4 bar (0−20 psig) positive 1L3784000A2
0−2.0 bar (0−30 psig) positive and 1.0−0−1.0 bar

(30−0−15 psig) compound 1L3785000A2

Stainless steel,

0−1.0 bar (0−15 psig) positive, 0−1.0 bar

(0−30 inches Hg) vacuum, and 500−0−500 mbar

(15−0−7.5 psig) compound 1L3786000A2
0−2.0 bar (0−30 psig) positive, 1.0−0−1.0 bar

(30−0−15 psig) compound 1L3787000A2

*Recommended spare parts

1. This part is included in the Controller Repair Kit.

3. If ordering the bellows (key 71) to change the range of a gauge pressure
controller, also order the appropriate bellows spring (key 80). Also order
keys 101, 102, and 103 if you do not have them.

35

Instruction Manual

C1 Controllers and Transmitters

SPRING−OUT CLEANING WIRE

RELAY ASSEMBLY

NOTES:

ARROW DOWN—RELIEVES ON DECREASING OUTPUT (OUTPUT @ SUPPLY DURING SHUTDOWN)

1
2

ARROW UP—RELIEVES ON INCREASING OUTPUT (OUTPUT @ ZERO DURING SHUTDOWN)

KEYS 80, 81, AND 82 ARE NOT SHOWN

GE31718−A
E1072

PROPORTIONAL-PLUS-RESET CONTROLLER WITH DIFFERENTIAL

RELIEF VALVE ASSEMBLY FOR ANTI-RESET WINDUP

September 2009

2

1

Figure 22. Typical Reverse Acting Fisher C1 Proportional−Plus−Reset Assembly (continued)

(Refer to figure 25 for the Front View of the Case & Cover Assembly)

Key Description Part Number

71* Differential−Pressure Bellows (input)

Brass

0−200 mbar (0−80 inches wc) 2L3790000A2
0−0.7 bar (0−10 psi) 2L3791000A2
0−1.4 bar (0−20 psi) 2L3792000A2

Stainless steel,

0−2.0 bar (0−30 psi) 2L3793000A2

71K Machine Screw

bellows sensing instruments only (2 req’d) 1A331928982

71L* Bearing

bellows sensing instruments only (2 req’d) 1L379546202

71M* Link

(4)

72* Lock Spring, 304L SST GE32298X012
73 Proportional Band Adjustment Knob, steel/PPS
74 Machine Screw

75* Gasket

Std Temp, chloroprene (2 req’d) 1D397003012
High Temp, silicone (2 req’d) 1N873604142

76* Nozzle O−Ring

Std Temp, nitrile 1E222606992
High Temp, fluorocarbon 1N838706382

(4)

, steel pl

(4)

bellows sensing instruments only 1L379641012

(1)

, 18−8 SST (2 req’d)

(1)

(1)

,

Key Description Part Number

Note

A total of 5 O−rings (key 77) are used. 1
O−ring is used under the sealing screw (key

49), 1 O−ring is used under the reversing
block screw (key 50), 1 O−ring is used
between the reversing block ass’y (key 52)
and the calibration adjuster (key 36), and 1
O−ring is used in the recessed area under the
head of each of the bellows screws (key 53).

77* O−Ring,

Std Temp, nitrile (5 req’d) 1D687506992
High Temp, fluorocarbon (5 req’d) 1N430406382

Note

Keys 78 through 82 are used for
Proportional−Plus−Reset controllers only.

78 Tubing Assembly, SST
79 Tubing Assembly, SST
80 Anti−Reset Windup Cover (not shown)
81* O−Ring (not shown) (2 req’d) 1C853806992

36

*Recommended spare parts

1. This part is included in the Controller Repair Kit.

3. If ordering the bellows (key 71) to change the range of a gauge pressure
controller, also order the appropriate bellows spring (key 104). Also order
keys 101, 102, and 103 if you do not have them.

4. This part is part of the bellows assembly, key 71.

Instruction Manual

September 2009

A

A

C1 Controllers and Transmitters

C

C

B

B

A

A

NOTE:
KEYS 33 AND 74 ARE NOT SHOWN

GE26600−A
E1073

Figure 23. Controller Subassembly with Bourdon Tube Sensing Element

Key Description

82 Machine screw (not shown) (2 req’d)
98 Machine Screw, steel pl (4 req’d)

Gauge and differential pressure bellow instruments

99 Washer, steel pl

for Bourdon tube instruments (2 req’d)
for bellows sensing instruments (4 req’d)

100 Bellows Yoke, zinc

use with gauge and differential pressure bellows

Note

Keys 101 through 105 are used for gauge
pressure bellows instruments only.

101 Jam Nut, steel pl

SECTION A-A

SECTION B-B

GE33918−A/IL

VIEW A-A

BOURDON TUBE TRAVEL

STOP SUBASSEMBLY

SECTION C-C

Key Description Part Number

102 Washer, steel pl
103 Spring seat, pl brass

104 Spring, steel pl
105 Label, bellows sensing instruments only

190 Anti−Reset Windup Ass’y

For Proportional−Plus−Reset Controllers only

256 Reset Restriction Valve

For proportional−plus−reset controllers

w/o anti−reset windup 19A4361X012

For proportional−plus−reset controllers

w/ anti−reset windup 19A4363X012

37

Instruction Manual

C1 Controllers and Transmitters

B

B

A

A

September 2009

LINK (KEY 71M)

SCREW (KEY 71K)

BEARING (KEY 71L)

SIDE VIEW OF SUBASSEMBLY

WITH GAUGE-PRESSURE

BELLOWS SENSING ELEMENT

NOTES:
KEYS 33, 46 AND 74 ARE NOT SHOWN
KEY 52 IS FEEDBACK BELLOWS

1

KEYS 71K, 71L, & 71M ARE PART OF THE BELLOWS ASSEMBLY (KEY 71)

GE35161−A
GE34734−A
E1074

SECTION B-B

SECTION A-A

1

1

LINK (KEY 71M)

1

1

BEARING
(KEY 71L)

1

1

SCREW
(KEY 71K)

SIDE VIEW OF SUBASSEMBLY WITH DIFFERENTIAL

PRESSURE BELLOWS SENSING ELEMENT

Figure 24. Controller Subassembly with Either Gauge−Pressure Bellows or Differential−Pressure Bellows Sensing Element

38

Instruction Manual

September 2009

SECTION B-B

SECTION A-A

COMPRESSION PLUGS

2X ROLL PIN

A

A

ATEX MARKING

C1 Controllers and Transmitters

2 PSIG LABEL − USE WITH 2 PSIG CASE AND COVER ASSEMBLY
(INSIDE COVER)

CHANGE ACTION LABEL
(INSIDE COVER)

B

B

COVER ASSEMBLY

CASE ASSEMBLY

GE28278−A
E1075

Figure 25. Front View of Case and Cover Assembly

Mounting Parts for Panel, Wall, Pipestand, or Fisher Actuator Mounting (figures 2 and 3)

Key Description

Note

Contact your Emerson Process Management sales
office for C1 mounting FS number.

213 Mounting Plate, steel

For yoke mounting on

470, 472, 513, 656, 657 and 667

For yoke mounting on 480

Vertical

For yoke mounting on 1051 and 1052

Size 40, positions 1 and 3 w/switch and

Size 60, position 1 w/switch

All others

Key Description

213 Mounting Plate, steel (continued)

For yoke mounting on 1061 Size 30,

positions 1 and 3 w/switch and position 1 w/o

switch, Size 40, position 1 w/switch and

Sizes 80 and 100, position 3 w/o switch

All others

For pipe stand mounting

215 Machine Screw, steel pl (specify quantity req’d)

5/16 UNC X 1 inch
5/16 UNC X 1−1/2 inches
5/16 UNC X 2 inches

216 Hex Nut, steel pl (specify quantity req’d)

For filter regulator mounting on

1051, 1052 and 1061

All other types and mountings

220 Mounting Bracket, steel pl (not shown)

For casing mounting and casing−mounted filter

regulator on 1051 and 1052

221 Lockwasher, steel pl (specify quantity req’d)

39

Instruction Manual

C1 Controllers and Transmitters

Key Description

222 Cap Screw, steel pl (specify quantity req’d)

5/16 UNC X 3/4 inch
5/16 UNC X 1 inch
5/16 UNC X 1−1/8 inches
5/16 UNC X 1−1/4 inches
5/16 UNC X 1−3/4 inches
5/16 UNC X 2−1/2 inches
3/8 UNF X 1−1/8 inches

223 Cap Screw, steel pl

1051 and 1052 with either case or

yoke mounted regulator and 1061

with yoke mounted regulator (2 req’d)

228 Spacer Spool, steel (specify quantity req’d)

470, 472, 480, 513, 656, 657, 667,

pipe stand 1051, 1052 and 1061

229 Cap Screw, steel pl (not shown) (specify quantity req’d)

1051 and 1052 casing−mounted

controller

238 Mounting Plate, steel

For yoke−mounted filter regulator

1051, 1052 and 1062 sizes 40 and 60
1061 size 30

240 Cap Screw, steel

For yoke−mounted filter regulator on

1051 and 1052 sizes 40 and

60 (2 req’d)

241 Spacer Spool, steel

For yoke mounted filter regulators on

1051 and 1052 sizes 40 and 60 (2 req’d)

September 2009

Key Description

242 Spacer Spool, steel (not shown)

For yoke mounting on

1051 and 1052 size 40 (2 req’d)
1061 sizes 30, 80 and 100 (2 req’d)

243 Street Elbow, pl galvanized malleable iron (not shown)

For mounting on 470, 472, 480, 513, 656,

657, 667, panel, pipe stand, 1051, 1052 and 1061

w/nipple−mounted filter regulator

244 Pipe Nipple, pl galvanized steel (not shown)

For mounting on 470, 472, 480, 513, 656,

657, panel, pipe stand, 1051, 1052 and 1061

w/nipple−mounted filter regulator

250 Clamp, Steel

For pipe stand mounting (2 req’d)

251 Bracket Assembly, steel

For panel or wall mounting (2 req’d)

252 Cap Screw, steel pl

For panel or wall mounting (4 req’d)

Note

Specify quantity of fittings.

Connector, Brass

1/4 NPT X 1/4 O.D. tubing
1/4 NPT X 3/8 O.D. tubing

Elbow, Brass

1/4 NPT X 1/4 O.D. tubing
1/4 NPT X 3/8 O.D. tubing

Fisher is a mark owned by one of the companies in the Emerson Process Management business division of Emerson Electric Co. Emerson
Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property
of their respective owners. This product may be covered under pending patent applications.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they
are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or
applicability. All sales are governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the
designs or specifications of such products at any time without notice. Neither Emerson, Emerson Process Management, nor any of their affiliated
entities assumes responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use, and maintenance of
any product remains solely with the purchaser and end−user.

Emerson Process Management

Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore

www.Fisher.com

40

EFisher Controls International LLC 2008, 2009; All Rights Reserved