Fisher 4070 User manual

D102589X012

Type 4060 and 4070 Valve Positioners

Contents

Introduction

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Scope of Manual 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

Installation

3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Positioner Mounting 3. . . . . . . . . . . . . . . . . . . . . . . . . .

Pressure Connections 4. . . . . . . . . . . . . . . . . . . . . . . .

Supply Connection 4. . . . . . . . . . . . . . . . . . . . . . . . . .

Output Connections 5. . . . . . . . . . . . . . . . . . . . . . . . .

Instrument Connection 5. . . . . . . . . . . . . . . . . . . . . . .

Vent 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Connections for Type 4070

Electro-PneumaticPositioners 6. . . . . . . . . . . . . . .

Operating Information

6. . . . . . . . . . . . . . . . . . .

Front Cover and Indicator Cover 6. . . . . . . . . . . . . . .

Cam Adjustment 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pre-calibration 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Span and Zero Adjustment 8. . . . . . . . . . . . . . . . . . .

Damper Adjustment 9. . . . . . . . . . . . . . . . . . . . . . . . . .

Principle of Operation

9. . . . . . . . . . . . . . . . . . .

Maintenance

9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting 10. . . . . . . . . . . . . . . . . . . . . . . . . . .

Replacing Gauges 10. . . . . . . . . . . . . . . . . . . . . . . . .

Replacing the Pilot valve 10. . . . . . . . . . . . . . . . . . . .

Replacing the Diaphragm 11. . . . . . . . . . . . . . . . . . .

Replacing the I/P Unit Filter 11. . . . . . . . . . . . . . . . . .

Removing the Positioner 11. . . . . . . . . . . . . . . . . . . .

Replacing the Positioner 12. . . . . . . . . . . . . . . . . . . .

Parts Ordering

12. . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts List

12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 1. Type 4070 Electro-Pneumatic Valve Positioner

W7099-1/ IL

Introduction

Scope of Manual

This instruction manual provides installation, operat-

ing, calibration, maintenance, and parts ordering in-

formation for the Type 4060 pneumatic positioner and

the Type 4070 electro-pneumatic positioner. Refer to

Instruction Manual

Form 5452

January 1999 Types 4060 & 4070

Type 4060 & 4070

Table 1. Specifications

Available Configurations

Type 4060: Double-acting pneumatic valve posi-

tioner

Type 4070: Double-acting electro-pneumatic valve

positioner

Input Signal(1)

Type 4060: 3 to 15 psig (0.2 to 1.0 bar)

Type 4070: 4 to 20 mA dc

Output Signal(1)

Type 4060 and 4070: Pneumatic pressure as re-

quired by the actuator up to full supply pressure

Air Consumption

See table 2

Air Delivery

See table 2

Performance

See table 3

Supply Pressure(1)

Type 4060: 125 psig (8.6 bar), maximum

Type 4070: 21.8 to 125 psig (1.5 to 8.6 bar)

Operative Temperature Limits(1)

–40 to 185_F (–40 to 85_C)

Housing Classification

NEMA 4, IP66 per IEC 529

Pressure Connections

1/4-inch NPT

Gauge Connections

1/8-inch NPT

Approximate Weight

Type 4060:

Without gauges:

2.4 lbs (1.1 kg)

With gauges:

2.9 lbs (1.3 kg)

Type 4070:

Without gauges:

3.4 lbs (1.5 kg)

With gauges:

3.9 lbs (1.8 kg)

1. This term is defined in ISA Standard S51.1.

Table 2. Positioner Air Consumption and Air Delivery

U. S. Units, SCFM(1)

Supply Pressure, psig

29 58 87 116 145

Air Type 4060 0.19 0.43 0.71 0.98 1.26

Air

Consumption Type 4070 0.22 0.48 0.78 1.08 1.38

Air Delivery 6.9 12.8 18.8 24.7 30.6

Metric Units, normal m3/hr(2)

Supply Pressure, bar

2 4 6 8 10

Air Type 4060 0.31 0.69 1.14 1.58 2.03

Air

Consumption Type 4070 0.35 0.77 1.25 1.74 2.22

Air Delivery 11.1 20.6 30.2 39.7 49.2

1. SCFM—Standard cubic feet per minute (60_F and 14.7 psia)

2. Normal m3/hr—Normal cubic meters per hour (0_C and 1.01325 bar, absolute)

Table 3. Typical Performance for Type 4060 & 4070 Positioner

Characteristic Type 4060 Type 4070

Repeatability ≤0.5% ≤0.5%

Linearity(1) ≤0.5% ≤0.75%

Hysteresis(1) ≤0.75% ≤1.0%

1. This term is defined in ISA Standard S51.1

separate instruction manuals for information on the

actuator, control valve, and other accessories.

Only personnel qualified through training or experience

should install, operate, or maintain these positioners. If

you have any questions concerning the instructions in

this manual, contact your Fisher Controls sales office

or sales representative before proceeding.

Description

The Type 4060 pneumatic positioner and the Type

4070 electro-pneumatic positioner are designed for

use with the Type 585C and 585CR piston actuators.

These positioners mount on the actuator and provide

the desired valve plug position for a specific input sig-

nal. The Type 4060 accepts a pneumatic input signal

and the Type 4070 accepts a 4 to 20 milliampere dc

input signal.

The positioners come standard with built in dampers,

gauge ports and an O-ring sealed housing. The hous-

ing utilizes a unique O-ring seal that can be adjusted

to a sealed or drained position.

Ease of calibration and maintenance are built into the

design with easily accessible span and zero adjust-

ment, and very simple parts replacement.

Specifications

Specifications for the Type 4060 and 4070 valve posi-

tioners are listed in table 1.

Type 4060 & 4070

Installation

Typically, the positioner is ordered with the actuator. If

so, the factory mounts and calibrates the valve posi-

tioner and connects the positioner output to the actua-

tor. If the positioner is ordered separately from the ac-

tuator, perform the mounting procedure. Refer to the

appropriate instruction manuals for actuator and valve

installation procedures.

WARNING

Avoid personal injury from sudden re-

lease of process pressure. Before

mounting the positioner on a valve in

service:

DDisconnect any operating lines pro-

viding air pressure or a control signal to

the actuator. Be sure the actuator can-

not suddenly open or close the valve.

DUse bypass valves or completely

shut off the process to isolate the valve

from process pressure. Relieve process

pressure on both sides of the valve.

Drain the process media from both

sides of the valve.

DVent actuator loading pressure and

relieve any actuator spring precompres-

sion.

DUse lock-out procedures to be sure

that the above measures stay in effect

while you work on the equipment.

Positioner Mounting

Remove the storage seal, shown in figure 2, from the

connection block, mount the positioner on the actua-

tor, and make connections to the instrument.

The mounting bracket (key 7B) is used for side mount-

ing the positioner to the actuator yoke. Refer to

figure 3 for part locations.

1. Attach the mounting bracket (key 7B) to the posi-

tioner with the two hex head bolts (key 7D) as shown

in figure 3.

2. Adjust the pin on the feedback lever arm assembly

(key 2) for the appropriate actuator travel (see figure

4). For actuators with 3/4-inch (19.1 mm) travel or

less, use the 30 degree markings. For actuator travels

greater than 3/4-inch (19.1 mm), use the 60 degree

markings.

Figure 2. Storage Seal Location

A7226/ IL

3. Attach the feedback lever arm assembly to the po-

sitioner spindle with the flat head screw as shown in

figure 4.

Note

The stem connector bolts may not be

long enough to permit mounting the

feedback bracket with spacers. If not,

replace the stem connector bolts with

the bolts included in the mounting kit

(key 7G). See the actuator instruction

manual for information on installing the

stem connector.

4. Place the feedback bracket (key 7A), with spacers

(key 7E), over the stem connector bolts so that the

slot in the feedback bracket (key 7A) is opposite the

actuator travel indicator. Fasten the feedback bracket

in place with two hex nuts (key 7F).

5. Position the actuator to its mid-travel position using

a handwheel or manual loading regulator.

Note

In the next step. loosening the cam lock-

ing nut inside the positioner may aid po-

sitioner mounting. See figure 9 for cam

locking nut location.

6. With the actuator at its mid-travel position, insert

the mounting bolt (key 7C) through the slotted hole in

the mounting bracket (key 7B).

7. Attach the bracket to the actuator yoke leg oppo-

site the travel indicator web. Leave the mounting bolt

loose. Be sure the feedback lever assembly pin en-

gages the feedback bracket slot.

8. Position the positioner mounting bracket (key 7B)

so that the feedback lever arm assembly (key 2) is

Type 4060 & 4070

Figure 3. Mounting the Positioner on a Type 585C Actuator

BOLTS

MOUNTING BRACKET

BOLT P/P POSITIONER

LEVER ARM ASSY

FEEDBACK BRACKET

CAP SCREWS

SPACERS

HEX NUT

INSTRUMENT GAUGE PORT

1/4 NPT INSTRUMENT PORT

SUPPLY GAUGE PORT

1/4 NPT C1 PORT

C1 GAUGE PORT

1/4 NPT SUPPLY PORT

C2 GAUGE PORT

1/4 NPT C2 PORT

NOTE:

TWO CAP SCREWS (KEY 7G)

ARE INCLUDED IN MOUNTING KIT

IF LONGER LENGTH IS RE-

QUIRED.

37B9461-A

B2643/ IL

Figure 4. Positioner Feedback Lever Arm Assembly (Key 2)

POSITIONER SPINDLE

(NOT PART OF THE FEEDBACK

LEVER ASSEMBLY)

BOLT

NUT

FLATHEAD

SCREW

FEEDBACK LEVER ARM

A7194/ IL

parallel to the feedback bracket (key 7A) at mid-travel

position. Tighten the mounting bolt (key 7C).

9. Be sure the feedback lever arm assembly pin does

not pinch, bind, or bend while manually stroking the

actuator.

Pressure Connections

Pressure and gauge connections are shown in figure

5. All pressure connections are 1/4-inch G or NPT fe-

male connectors. Use 3/8-inch tubing or 1/4-inch pipe

for all pressure connections. Gauge ports are 1/8-inch

G or NPT female connectors.

WARNING

Valve positioners are capable of provid-

ing full supply pressure to connected

equipment. To avoid personal injury and

equipment damage, make sure the sup-

ply pressure never exceeds the maxi-

mum safe working pressure of any con-

nected equipment.

Supply Connection

WARNING

Personal injury or property damage may

occur from an uncontrolled process if

the supply medium is not clean, dry, oil-

free air, or non-corrosive gas. Industry

Type 4060 & 4070

Figure 5. Positioner Pressure and Gauge Connections

INSTRUMENT

CONNECTION

SUPPLY

CONNECTION

OUTPUT

CONNECTION

GAUGE

PORTS

I/P UNIT,

TYPE 4070

OUTPUT

CONNECTION

INPUT SIGNAL GAUGE

PORT FOR TYPE 4060

A7227/ IL

instrument air quality standards de-

scribe acceptable dirt, oil, and moisture

content. Due to the variability in nature

of the problems these influences can

have on pneumatic equipment, Fisher

Controls has no technical basis to rec-

ommend the level of filtration equipment

required to prevent performance degra-

dation of pneumatic equipment. A filter

or filter regulator capable of removing

particles 40 microns in diameter should

suffice for most applications. Use of

suitable filtration equipment and the es-

tablishment of a maintenance cycle to

monitor its operation is recommended.

The supply medium must be clean, dry air or noncor-

rosive gas that meets the requirements of ISA Stan-

dard S7.3-1975. The supply pressure should not ex-

ceed the following limits:

DFor the actuator and positioner, do not exceed

the maximum pressure rating of 125 psig (8.6 bar).

DFor the valve, do not exceed the maximum allow-

able thrust of the specific valve.

Connect supply pressure to the positioner supply port

S. Gauge port S is sealed with a plug. To install a sup-

ply gauge, unscrew the plug and install an appropriate

gauge.

Output Connections

For Type 585C actuators, connect the positioner out-

put port C1 to the actuator lower cylinder (yoke) con-

nection. Connect output port C2 to the actuator upper

cylinder connection.

For Type 585CR actuators, connect the positioner

output port C1 to the actuator upper cylinder connec-

tion. Connect output port C2 to the actuator lower cyl-

inder (yoke) connection.

For single-acting operation plug port C1 for increasing

signal to open or close. Plug C2 for decreasing (re-

verse) signal to close.

Gauge ports C1 and C2 are sealed with plugs. To

install gauges, unscrew the plugs and install gauges.

Instrument Connection

Connect the control device 3 to 15 psig (0.2 to 1.0 bar)

output to the positioner input port I. If a gauge is de-

sired, remove the plug from port Ipand install an ap-

propriate pressure gauge.

The Type 4070 electro-pneumatic positioner requires

a 4 to 20 milliampere dc current input signal from the

control device. For connections to the Type 4070, re-

fer to the electrical connections section.

Vent

WARNING

If a flammable, toxic, or reactive gas is

to be used as the supply pressure me-

dium, personal injury or property dam-

age could result from fire or explosion

of accumulated gas or from contact with

toxic, or reactive gas. The positioner/ac-

tuator assembly does not form a gas-

tight seal, and when the assembly is en-

closed, a remote vent line, adequate

ventilation, and necessary safety mea-

sures should be used. A remote vent

pipe alone cannot be relied upon to re-

move all hazardous gas. Vent line pip-

ing should comply with local and re-

gional codes and should be as short as

possible with adequate inside diameter

and few bends to reduce case pressure

buildup.

The port (OUT) is for venting the unit. All air from the

positioner, actuator, and I/P unit is vented to atmo-

sphere through this port. This port should be left open

Type 4060 & 4070

Figure 6. I/P Unit Storage Seal Location

A7228/ IL

to prevent pressure buildup inside the case and to pro-

vide a drain hole for any moisture that might collect

inside the case. If a remote vent is required, the vent

line must be as short as possible with a minimum

number of bends and elbows.

The vent port (OUT) or the end of a remote vent pipe

must be protected against the entrance of all foreign

matter that could plug the vent. Check the vent period-

ically to be certain it is not plugged.

Electrical Connections for Type 4070

Electro-Pneumatic Positioners

WARNING

For intrinsically safe installations, refer

to the factory drawings or to instruc-

tions provided by the barrier manufac-

turer for proper wiring and installation.

Do not make connections to port I. It is automatically

sealed off and protected.

Remove the storage seal, shown in figure 6, from the

end of the unit to expose the conduit entry. Use the

1/2-inch NPT conduit connection or PG 13.5 (M20)

cable gland for installation of field wiring.

Refer to figure 7 when connecting field wiring from the

control device to the I/P unit. Connect the positive wire

from the control device to the I/P unit positive (+) ter-

minal, and the negative wire from the control device to

the I/P unit negative (–) terminal. Do not overtighten

Figure 7. Typical Field Wiring Diagram

CONTROL

DEVICE

I/P UNIT

A3875-1/ IL

the terminal screws. Maximum torque is 4 lbfSin. (0.45

NSm). Connect the I/P unit grounding terminal to an

earth ground.

To monitor the I/P unit output, install a gauge in gauge

port P. Gauge port Pis sealed with a plug. To install a

gauge, unscrew the plug and install a gauge.

Operating Information

Front Cover and Indicator Cover

The positioner front cover is shown in figure 8. It is

secured to the unit with four captive screws and

sealed with an O-ring. The front cover O-ring can be

looped over notches in the front cover to allow for

drainage.

There are eight locations on the front cover where the

O-ring can be looped. This O-ring system is common

to the pneumatic unit and I/P unit. This unique sealing

system allows for complete sealing or draining of the

units by changing the position of the front cover O-

ring.

The indicator cover is O-ring sealed and secured by a

bayonet coupling. The indicator cover also secures the

identification cover to the front cover.

To remove the indicator cover, turn it slightly counter-

clockwise until it loosens. The identification cover and

indicator cover O-ring are now removable. When

installing the indicator cover and identification cover,

make sure that the indicator cover O-ring is properly

engaged.

Type 4060 & 4070

Figure 8. Front Cover and Indicator Cover

IDENTIFICATION

COVER INDICATOR

COVER

FRONT

COVER

O-RING

NOTCH

FRONT COVER SHOWN WITH O-RING LOOPED

OVER NOTCHES TO PERMIT DRAINING

INDICATOR

COVER O-RING

B2644/ IL

FRONT

COVER

CAM LOCKING NUT

SCREW

CAM

CORRECT

INCORRECT

CAM

FOLLOWER

1/16-INC H

(1–2 mm)

Figure 9. Cam Adjustment

CAM POSITIONED FOR A FAIL-OPEN

ACTUATOR WITH 3/4-INCH (19.1 MM)

OR LESS TRAVEL

B2645/ IL

Cam Adjustment

Refer to figure 9. With the cover and indicator re-

moved, loosen the screw and turn the cam locking nut

counterclockwise until the cam loosens.

The cam has two lobes. The 30 degree lobe is used

for actuator travels of 3/4-inches (19.1 mm) or less.

The 60 degree lobe is used for actuator travels of

greater than 3/4-inch (19.1 mm). The cam also may be

turned over. Each lobe is stamped either direct (D) or

reverse (R). Refer to table 4 for cam installation infor-

mation.

Install the cam so that the follower will ride on the cor-

rect lobe listed in table 4. For fail-open actuators, the

follower will ride on the cam lobe to the right of the

follower. For fail-close actuators the follower will ride

on the cam lobe to the left of the follower.

Type 4060 & 4070

Table 4. Cam Position Information

Actuator Travel Cam

Lobe

Cam Orientation for Actuator

Failure Mode

Actuator

Travel

Lobe Fail Open Fail Close

greater than

0.75 inch (19.1 mm) 60_D R

less than or equal to

0.75 inch (19.1 mm) 30_D R

To secure the cam, make sure the screw is backed

out from the locking nut. Tighten the locking nut finger

tight then tighten the screw. Install and adjust the indi-

cator and reinstall the cover.

Calibration

Pre-calibration

Ensure that the cam is installed correctly for the ap-

propriate actuator travel and failure mode. Refer to the

“Cam Adjustment” procedure. Also ensure the pin on

the feedback lever arm assembly is positioned correct-

ly for the appropriate actuator travel. Refer to step 2 in

the “Positioner Mounting” procedure.

With the two locking screws facing you, as shown in

figure 10, there should be at least one coil of the feed-

back spring above the screws. However, the end of

the feedback spring should not touch the spring guide.

To adjust the spring, loosen the two locking screws.

Hold the two locking screws in place while rotating the

feedback spring. Tighten the locking screws.

Zero and Span Adjustment

Refer to figure 10.

1. Remove the positioner front cover.

2. Apply supply pressure to the positioner.

3. Set the input signal to the 0% value and wait for the

unit to reach steady state.

4. Rotate the zero adjustment until the actuator stem

is at its starting position. Zero is adjusted by turning

the silver thumb wheel located on the lower arm or

externally with a screwdriver through the zero adjust-

ment opening.

5. Slowly increase the input signal until the input

reaches the 100% value. Observe the actuator travel

and valve position as the input increases. Note the

actuator travel at 100% input signal.

6. Set the input signal to the 0% value.

Figure 10. Positioner Span and Zero Adjustment Locations

SPAN

ADJUSTMENT

SPRING GUIDE LOCKING SCREW

ZERO

ADJUSTMENT

LOWER ARM

ZERO ADJUSTMENT

COVER

A7229/ IL

7. If necessary, loosen the locking screw and adjust

the span as follows (span is adjusted with the brass

colored thumb wheel located on the feedback spring):

DIf the actuator travel recorded in step 5 is short of

the desired travel at 100% input signal, rotate the span

adjustment to the left to increase span. Tighten the

locking screw.

DIf the travel recorded in step 5 reaches the de-

sired travel before the input signal reaches the 100%

value, rotate the span adjustment to the right to de-

crease span. Tighten the locking screw.

After the span adjustment, recheck to be sure the end

of the feedback spring is not touching the spring guide.

8. After a span adjustment, recheck the zero and ad-

just if necessary.

9. Repeat steps 4 through 8 as necessary to achieve

correct actuator travel.

Type 4060 & 4070

DAMPER

ADJUSTMENTS

Figure 11. Damper Adjustment

A7230/ IL

10. Replace the positioner front cover.

11. If you used the zero adjustment opening, remem-

ber to install the zero adjustment cover to ensure the

unit is sealed.

Damper Adjustment

The built in dampers provide a simple means of ad-

justing the actuator travel speed. The damper adjust-

ments are located on the connecting block as shown

in figure 11. For maximum actuator travel speed adjust

dampers to the minimum damping position.

Double acting actuators—adjust only the OUTLET

damper. Set the SUPPLY damper to the minimum

damping position.

Single acting actuators—adjust both dampers for

desired operation.

Principle of Operation

Refer to figure 12.

The pneumatic positioner operates on a force balance

principal. Force is originated by the signal pressure

transmitted through a diaphragm on to the balance

arm. The opposing force is achieved through the feed-

back spring and is proportional to the position of the

lower arm. The lower arm position is determined by

the position of the cam which is secured to the spindle

and connected to the actuator shaft thus providing the

feedback from the actuator/valve. When these two

forces are equal, the balance arm and the spool in the

Figure 12. Principle of Operation

A7231/ IL

pilot valve is in a neutral position—the complete unit is

in a balanced position. Air is supplied to the pilot valve

through port S, and controls the air flow through ports

C1 and C2

Assume an equilibrium position. An increasing control

pressure deflects the diaphragm 1down, compressing

the feedback spring 3. The balance arm 2moves the

spool 7in the pilot valve 8furnishing supply air to the

actuator, while at the same time air is exhausted from

actuator and is vented to atmosphere through the pilot

valve and the OUT port.

With increasing supply air, the linear motion of the ac-

tuator stem rotates the positioner spindle 6. The

spindle and cam 5rotation forces the lower arm 4up-

wards compressing the feedback spring 3. This motion

continues until the two forces are equal and the unit is

in an equilibrium position.

Maintenance

WARNING

Avoid personal injury from sudden re-

lease of process pressure. Before

mounting the positioner on a valve in

service:

DDisconnect any operating lines pro-

viding air pressure or a control signal to

the actuator. Be sure the actuator can-

not suddenly open or close the valve.

Type 4060 & 4070

DUse bypass valves or completely

shut off the process to isolate the valve

from process pressure. Relieve process

pressure on both sides of the valve.

Drain the process media from both

sides of the valve.

DVent actuator loading pressure and

relieve any actuator spring precompres-

sion.

DUse lock-out procedures to be sure

that the above measures stay in effect

while you work on the equipment.

DFor Type 4070 electro-pneumatic

positioners in intrinsically safe areas,

current monitoring during operation

must be with an approved meter for haz-

ardous areas in order to avoid personal

injury or property damage caused by an

explosion or fire.

Troubleshooting

Signal change has no effect on the actuator posi-

tion.

—Check indicator and screw.

—Check air supply to positioner and tubing to the ac-

tuator.

—Check input signal to positioner.

—Check diaphragm for damage or leakage.

—Check pilot valve function.

—Check cam for correct setting.

—Check I/P output

Signal change results in actuator running to end

positions.

—Check coupling between positioner and actuator.

—Check cam position and locking screw.

—Check input signal.

Inaccurate positioning.

—Dirty or worn pilot valve.

—Defective or leaking diaphragm.

Figure 13. Pilot Valve Assembly

SCREW

PILOT VALVE

ASSEMBLY

SPOOL SPOOL GROVE

BALANCE ARM

LEAF SPRING

A7232/ IL

—Input signal fluctuates.

—Incorrect sizing of actuator.

—Valve/actuator “stiction”.

—High valve/actuator breakaway torque.

—Loose cam.

Replacing Gauges

1. Shut off supply pressure and process lines to the

positioner.

2. Remove the defective gauge.

3. Coat the threads of the replacement gauge with a

sealant (Zink plate No. 770 or equivalent).

4. Screw the replacement gauge into the gauge port.

5. Apply supply pressure to the positioner. Using a

soap solution, check around the ports and connections

for leaks.

Replacing the Pilot Valve

Refer to figure 13 to remove the pilot valve for clean-

ing or inspection.

1. Remove the screw and carefully lift out the com-

plete pilot valve assembly.

2. Gently remove the spool from the block and clean

the parts, using mentholated cleaner or similar. Blow

the parts dry with compressed air. If the parts show

signs of wear, replace the assembly.

Note

Mixing spool valves and valve bodies

may result in very high bleed rates and

poor performance.

Type 4060 & 4070

Figure 14. Diaphragm

DIAPHRAGM COVER SCREWS

SCREW WASHERS DIAPHRAGM

A7233/ IL

3. Check the O-rings, then secure and install the pilot

valve assembly to the positioner housing and secure it

with the screw. Make sure that the leaf spring on the

balance arm is properly fitted in the spool groove.

4. Check again to insure smooth operation of the as-

sembly.

Replacing the Diaphragm

Refer to figure 14. For Type 4070 electro-pneumatic

positioners, the I/P unit must be removed to access

the diaphragm.

1. Loosen the four screws and remove the diaphragm

cover.

2. Loosen the screw that secures the diaphragm. Re-

move the diaphragm and washers.

When installing the diaphragm make sure to place one

washer on each side of the diaphragm. Make sure that

the raised circle on the washers is facing the dia-

phragm.

3. Install the screw and tighten.

4. Check the O-ring on the diaphragm cover, then

install and secure the cover with the four screws.

Figure 15. Filter Replacement

FILTER

O-RING

FILTER PLUG

A7234/ IL

Replacing I/P Unit Filter

CAUTION

Do not operate the unit without filter

and filter plug installed. Do not attempt

to unscrew filter plug while positioner is

pressurized.

The I/P unit on the Type 4070 positioner is equipped

with a built in secondary filter located on the side of

the I/P unit.

For replacement or inspection, refer to figure 15. Make

sure the positioner unit is not pressurized, then un-

screw the filter plug. Remove the filter and install a

new one into the filter plug . Check the condition of the

O-ring and filter compartment. If moisture is found,

check upstream filters and oil-and-water separators.

Moisture can cause the I/P unit to fail. Reinstall the

filter plug.

Removing the Positioner

1. Shut off supply pressure and process lines to the

positioner.

2. Disconnect pneumatic and, if necessary, electrical

connections.

3. Remove the screws that attach the positioner to

the mounting bracket and remove the positioner.

Type 4060 & 4070

Replacing the Positioner

1. Replace the positioner on the actuator by perform-

ing the mounting and connection procedures in the

“Installation” section.

2. Calibrate the positioner by performing the proce-

dures in the “Calibration” section.

Parts Ordering

When corresponding with your Fisher Controls sales

office or sales representative about this equipment,

refer to the serial number found on the serial tag at-

tached to the positioner body. Also, specify the com-

plete 11-character part number from the following

parts list when ordering replacement parts.

Parts List

Key Description Part Number

1 Positioner

Type 4060 pneumatic positioner 18B3125X012

Type 4070 electro-pneumatic positioner

w/FM and CSA intrinsic safety approvals 18B3126X012

w/CENELEC intrinsic safety approvals 18B3127X012

2 Feedback Lever Arm Ass’y 18B2837X012

3 Instrument Gauge

Triple scale 0–30 psi/2 bar/0.2 MPa 11B4036X012

4 Supply Gauge

Triple scale 0–160 psi/11 bar/1.1 MPa 11B4036X032

5 Output Gauge

Triple scale 0–160 psi/11 bar/1.1 MPa 11B4036X032

6 Output Gauge

Triple scale 0–160 psi/11 bar/1.1 MPa 11B4036X032

– – – Test connections (4 req’d) 1N908899012

– – – Pilot Valve 18B2838X012

7 Mounting kit

For size 25 actuators 18B3128X012

For size 50 actuators 18B3129X012

For information, contact Fisher Controls:

Marshalltown, Iowa 50158 USA

Cernay 68700 France

Sao Paulo 05424 Brazil

Singapore 128461

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Printed in U.S.A.