Emerson Fisher 846, Fisher 3311 Instruction Manual

Instruction Manual

Form 5739
February 2002

Introduction

Type 846 and Model 3311 Current-to-Pressure Transducers

Contents

1. Introduction

Scope of Manual 1–2. . . . . . . . . . . . . . . . . . . . . . . . .

Description 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Installation

Mounting 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pressure Connections 2–1. . . . . . . . . . . . . . . . . . . .

Supply Pressure 2–1. . . . . . . . . . . . . . . . . . . . . . . .

Output Pressure 2–5. . . . . . . . . . . . . . . . . . . . . . . .

Electrical Connections 2–7. . . . . . . . . . . . . . . . . . . .

Stroke Port 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Exhaust Port 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Signal Interruption 2–8. . . . . . . . . . . . . . . . . . . . . . . .

3. Calibration

Standard Performance:

Full Range Input, Direct Action 3–1. . . . . . . . . .

Multirange Performance:

Full Range Input, Direct Action 3–2. . . . . . . . . .

Standard Performance:

Split Range Input, Direct Action 3–3. . . . . . . . . .

4 to 12 mA Input Signal 3–3. . . . . . . . . . . . . . . . . .

12 to 20 mA Input Signal 3–3. . . . . . . . . . . . . . . . .

Standard Performance:

Full Range Input, Reverse Action 3–3. . . . . . . .

Multirange Performance:

Full Range Input, Reverse Action 3–3. . . . . . . .

Standard Performance:

Split Range Input, Reverse Action 3–4. . . . . . .

4 to 12 mA Input Signal 3–4. . . . . . . . . . . . . . . . . .

12 to 20 mA Input Signal 3–4. . . . . . . . . . . . . . . . .

10 to 50 mA Input Signal 3–5. . . . . . . . . . . . . . . . .

Transporting the Module Final Assembly 3–5. . . .

5. Troubleshooting

Diagnostic Features 5–1. . . . . . . . . . . . . . . . . . . . . .

Stroke Port 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remote Pressure Reading (RPR) 5–1. . . . . . . . .

Using the HARTR Communicator to

Read the RPR Signal 5–1. . . . . . . . . . . . . . . .

Using a Frequency Counter to

Read the RPR Signal 5–2. . . . . . . . . . . . . . . .

In-service Troubleshooting 5–3. . . . . . . . . . . . . . . .

Troubleshooting in the Shop 5–5. . . . . . . . . . . . . . .

6. Maintenance

Module Final Assembly 6–1. . . . . . . . . . . . . . . . . . .

Removing the Module Final Assembly 6–1. . . . .

Replacing the Module Final Assembly 6–3. . . . .

Electronic Circuit Board 6–4. . . . . . . . . . . . . . . . . . .

Optional Remote Pressure Reading (RPR)

Jumper 6–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Range Jumper 6–5. . . . . . . . . . . . . . . . . . . . . . . . .

Action 6–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removing the Electronic Circuit Board 6–5. . . . .

Product Change 6–5. . . . . . . . . . . . . . . . . . . . . . . .

Replacing the Electronic Circuit Board 6–6. . . . .

Pilot/Actuator Assembly 6–6. . . . . . . . . . . . . . . . . . .

Action 6–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removing the Pilot/Actuator Assembly 6–6. . . . .

Replacing the Pilot/Actuator Assembly 6–7. . . . .

Module Subassembly 6–7. . . . . . . . . . . . . . . . . . . . .

Terminal Compartment 6–7. . . . . . . . . . . . . . . . . . .

Exhaust and Stroke Port Screens 6–8. . . . . . . . . .

7. Parts List

8. Loop Schematics

4. Principle of Operation

Electronic Circuit 4–1. . . . . . . . . . . . . . . . . . . . . . . . .

Magnetic Actuator 4–1. . . . . . . . . . . . . . . . . . . . . . . .

Pilot Stage 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Booster Stage 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . .

www.Fisher.com

D102005X012

Type 846 and Model 3311

Section 1
Introduction

Scope of Manual

This instruction manual provides installation,
operating, calibration, maintenance, and parts
ordering information for the Type 846 and Model
3311 current-to-pressure transducers. Refer to
separate manuals for instructions covering
equipment used with the transducers.

Only personnel qualified through training or
experience should install, operate, or maintain these
transducers. If there are any questions concerning
the instructions in this manual, contact your Fisher
sales office or sales representative before
proceeding.

Instruction Manual

Form 5739

February 2002

CAUTION

The products described in this
document are NOT designed for
nuclear-qualified applications. Using
non-nuclear qualified products in
applications that require
nuclear-qualified hardware or
products may cause inaccurate
readings.

Description

The Type 846 or Model 3311 current-to-pressure
transducer, shown in figure 1-1, accepts an electrical
input signal and produces a proportional pneumatic
output. Typically, 4 to 20 mA is converted to 0.2 to

1.0 bar (3 to 15 psi). Models are available in direct or
reverse action and field-selectable full or split range
inputs. See Section 3 Calibration for more
information on input/output combinations.

The most common application of the transducer is to
receive an electrical signal from a controller and
produce a pneumatic output for operating a control
valve actuator or positioner. The Type 846 and
Model 3311 may also be used to transduce a signal
for a pneumatic receiving instrument.

Figure 1-1. Type 846 and Model 3311 Current-to-Pressure

Transducer

network. The self-correcting ability provided by the
sensor/circuit combination allows the transducer to
produce a very stable and responsive output signal.

All active mechanical and electrical components of
the Type 846 and Model 3311 are incorporated into
a single, field-replaceable module called the module
final assembly, shown in figure 1-2. The module final
assembly contains the electronic circuit board,
pilot/actuator assembly, and booster stage. The
module final assembly is easily removed by
unscrewing the module cover. Its design minimizes
parts and reduces the time required for repair and
troubleshooting.

The terminal compartment and module compartment
are separated by a sealed compartment wall. This
multi-compartment housing also protects the
electronics from contaminants and moisture in the
supply air.

The Type 846 and Model 3311 are electronic I/P
transducers. They have a single electronic circuit
board, as shown in figure 1-2. The circuit contains a
solid-state pressure sensor that monitors output
pressure and is part of an electronic feedback

1–2

Specifications

Specifications for the Type 846 and Model 3311
transducer are listed in table 1-1.

Instruction Manual

Form 5739
February 2002

TERMINAL
COMPARTMENT
COVER

TERMINAL BLOCK

MODULE HOUSING

ELECTRONIC
CIRCUIT BOARD

MODULE FINAL
ASSEMBLY

Introduction

MODULE COVER

A6643/IL

Figure 1-2. Transducer Modular Construction

1–3

Type 846 and Model 3311

Instruction Manual

Form 5739

February 2002

Table 1-1. Specifications

Input Signal

(1)

Standard Performance:

4 to 20 mA dc, 4 to 12 mA dc, or 12 to 20 mA dc.
Field adjustable split ranging

10 to 50 mA dc. Consult factory for split range
input. Direct action only

Multirange Performance:

4 to 20 mA dc. Consult factory for split range
input.

10 to 50 mA dc. Consult factory for split range
input. Direct action only.

Output Signal

(1)(5)

Standard Performance:.

(Consult factory for split range output)

Direct Action (Minimum span of 6 psi)

Typical outputs: 0.2 to 1.0 bar (3 to 15 psi).
Rangeability between 0.1 and 1.2 bar (1 and
18 psi).

Reverse Action (Minimum span of 11 psi)

Typical outputs: 1.0 to 0.2 bar (15 to 3 psi)
Rangeability between 1.2 and 0.1 bar (18 and
1 psi).

Multirange Performance:

Direct Action (Minimum span of 6 psi)

Typical outputs: 0.2 to 1.9 bar (3 to 27 psi), 0.4
to 2 bar (6 to 30 psi), and 0.3 to 1.7 bar (5 to
25 psi).
Rangeability between 0.03 and 2.3 bar (0.5
and 33 psi).

Reverse Action (Minimum span of 11 psi)

Typical outputs: 1.9 to 0.2 bar (27 to 3 psi), 2
to 0.4 bar (30 to 6 psi), and 1.7 to 0.3 bar (25
to 5 psi)
Rangeability between 2.3 and 0.03 bar (33 and

0.5 psi).

Supply Pressure

(1)

Standard Performance

1.2 to 1.6 bar (18 to 24 psi)

Multirange Performance
Minimum: 0.2 bar (3 psi) greater than the

maximum calibrated output pressure

Maximum: 2.4 bar (35 psi)
Standard and Multirange Performance

Minimum: 0.2 bar (3 psi)

(4)

greater than the
maximum calibrated output pressure
Maximum: 2.4 bar (35 psi)

–Continued–

Output Air Capacity

(2)

Standard: 6.7 normal m3/hr (4.0 scfm) at 1.4 bar

(20 psi) supply pressure
Multirange: 9.0 normal m3/hr (6.0 scfm) at 2.5
bar (35 psig) supply pressure

Steady-State Air Consumption

(1)(2)

0.3 normal m3/hr (0.20 scfm) at 1.4 bar (20 psi)
supply pressure

Temperature Limits

Operating:
Storage:

(1)

–40 to 85_C (–40 to 185_F).

(1)

–40 to 93_C (–40 to 200_F).

Humidity Limits

0 to 100% condensing relative humidity.

Performance

(3)

Note: The performance of all Type 846 and

Model 3311 I/Ps is verified using computer
automated manufacturing systems to ensure
every unit shipped meets its performance
specifications.

Linearity

(1)

, Hysteresis

(1)

, and Repeatablility:

0.3% of span. Reference SAMA PMC 31.1.

Temperature Effect (total effect including zero
and span): 0.07%/_C (0.045%/_F) of span
Vibration Effect: 0.3% of span per g during

the following conditions:
5 to 15 Hz at 4 mm constant displacement
15 to 150 Hz at 2 g. 150 to 2000 Hz at 1 g.
per SAMA Standard PMC 31.1-1980, Sec. 5.3,
Condition 3, Steady State
Shock Effect: 0.5% of span, when tested per
SAMA Standard PMC 31.1, Sec. 5.4.

Supply Pressure Effect: Negligible
EMC Effects: These instruments have the CE

mark in accordance with the European
Electromagnetic Compatibility (EMC) Directive.
They meet the emissions requirements of IEC
61326-1 (Edition 1.1) for Class A equipment for
use in industrial locations and Class B equipment
for use in domestic locations. They also meet the
immunity requirements listed in table 1-2. This
table is in accordance with Annex A of IEC
61326-1 for equipment intended for use in
industrial locations.

Leak Sensitivity:

(2)

Less than 1.0% of span for
up to 5.0 normal m3/hr (3.0 scfm) downstream
leakage.

1–4

Instruction Manual

Form 5739
February 2002

Introduction

Table 1-1. Specifications (continued)

Performance (continued)

Overpressure Effect: Less than 0.25% of span

for misapplication of up to 7.0 bar (100 psi) supply
pressure for less than 5 minutes to the input port.

Reverse Polarity Protection: No damage occurs
from reversal of normal supply current (4 to 20
mA) or from misapplication of up to 100 mA.

Connections

Supply Air, Output Signal, and Output Gauge:

1/4–18 NPT female connection.
Electrical: 1/2–14 NPT female conduit
connection

Adjustments

Zero and Span: screwdriver adjustments located

in terminal compartment.

Remote Pressure Reading (RPR)

Jumper selectable, ON or OFF, if unit includes
option

Frequency Range: 5,000 to 8,000 Hz.
Amplitude: 0.4 to 1.0 V

p-p

Required Operating Voltage with Remote
pressure Reading Off

Min. 6.0 V (at 4 mA)
Max. 7.2 V (at 20 mA)

Required Operating Voltage with Remote
Pressure Reading On

Min 6.4 V (at 4 mA)
Max. 8.2 V (at 20 mA)

Hazardous Locations Certifications

Refer to the following specifications and the
transducer nameplate (see figure 1-3).

Factory Mutual (FM) Approvals
K5 Explosion-proof for Class I Division 1, Groups

B, C, and D. Dust Ignition-proof for Class II,
Division 1, Groups E, F, and G and Class III,
Division 1, hazardous locations. Factory
Sealed.

Intrinsically safe for Class I, Division 1,

–Continued–

Groups A, B, C, and D; Class II, Division 1,
Groups E, F, and G; and Class III, Division 1,
hazardous locations.

Non-incendive for Class I, Division 2, Groups
A, B, C, and D.

Canadian Standards Association (CSA)
Approvals
C6 Explosion-proof for Class I, Division 1,

Groups C and D; Class II, Division 1, Groups
E, F, and G; and Class III, Division 1,
hazardous locations. Factory Sealed.

Intrinsically safe for Class I, Division 1,
Groups A, B, C, and D. Temperature Code
T4.
Class I, Division 2, Groups A, B, C, and D.

BASEEFA/CENELEC Intrinsically Safe
Approval
I1 EEx ia IIC T5 (T

EEx ia IIC T4 (T
Parameters: U
W

=0.8 W (T5)/1.0 W (T4), Ceq=0,

max:in

amb
amb

max:in

=40_C)
=80_C)
=30 V dc, I

max:in

=200 mA,

Leq=0.02 mH.

BASEEFA Type N Approval
N1 Ex N II T5 (Tamb=70_C)

Parameter: Umax=10 V dc

ISSeP/CENELEC Flameproof Approval
E9 EEx d IIC T6

Standards Association of Australia (SAA)
Approvals
K7 Flameproof: Ex d IIC T6; Class I, Zone 1.

Intrinsic Safety: Ex ia IIC T4 (T

amb

=80_C);
Class I, Zone 0
Parameters: Ui=30 V dc, Ii=200 mA, Ci=8 nf,
Li=20 µH

Non-sparking Ex n IIC T4 (T

=80_C); Class

amb

I, Zone 2.
Parameter: U

=12 V dc

max

Russian (GOST) Approvals
EG Flameproof: 1 ExdIICT6X

IG Intrinsically Safe:

0ExiaIICT6 (Tamb = 40_C)
0ExiaIICT5 (Tamb=40_C)
0ExiaIICT4 (Tamb=80_C)

1–5

Type 846 and Model 3311

Table 1-1. Specifications (continued)

Instruction Manual

Form 5739

February 2002

Enclosure Rating

O-Rings: Nitrile except silicone for sensor

O-rings

NEMA 4X (FM, Factory Mutual)
CSA Enclosure Type 4X (CSA, Canadian
Standards Association)
IP66 (BASEEFA)
IP65 (SAA, Standards Association of Australia)
IP65 (GOST)
Tropicalization (Fungus test per MIL-STD-810)

Construction Materials

Options

Type 67CFR filter regulator, supply and output
gauges or tire valve remote pressure reading,
module cover with multiple stroke ports, stainless
steel housing, or stainless steel mounting bracket.

Weight

Aluminum: 2.9 kg (6.5 lb) excluding options

Housing: Low-copper aluminum or 316 stainless

steel

1. This term is defined in ISA Standard S51.1-1979.

2. Normal m3/hr—Normal cubic meters per hour (0_C and 1.01325 bar, absolute). Scfm—Standard cubic feet per minute (60_F and 14.7 psia).

3. Reference Conditions: 4.0 to 20 mA dc input, 0.2 to 1.0 bar (3 to 15 psi) output, and 1.4 bar (20 psi) supply pressure.

4. 0.14 bar (2 psi) for a 2.3 bar (33 psi) output

5. Metric calibration also available.

INFORMATION IN THIS AREA
IDENTIFIES THE HAZARDOUS AREA
CLASSIFICATION AND APPROVALS
FOR THE PRODUCT SPECIFIED ON
THE EQUIPMENT ORDER

Stainless Steel: 6.7 kg (14.8 lb) excluding

options

B2464

Port Phenomenon

Electrostatic discharge (ESD) IEC 61000-4-2

Enclosure

I/O signal/control

I/O signal/control

Specification limit = ±1% of span

1–6

Radiated EM field IEC 61000-4-3
Rated power frequency magnetic field IEC 61000-4-8 60 A/m at 50 Hz A

Burst (fast transients) IEC 61000-4-4 1 kV A
Surge IEC 61000-4-5 1 kV (line to ground only) B
Conducted RF IEC 61000-4-6 150 kHZ to 80 MHz at 3 volts B

CE MARK APPEARS ONLY ON UNITS
WITH EUROPEAN APPROVALS

Figure 1-3. Typical Nameplate

Table 1-2. EMC Immunity Performance Criteria

Basic

Standard

80 to 1000 MHz, 10 V/m

Test Level

4 kV contact

8 kV air

1 kHZ AM at 80%

Performance

Criteria

A

A

Instruction Manual

Form 5739
February 2002

Table 1-3. Model Number Table

Model Product Description

3311/0846 Current-to-Pressure Transducer

Code Action

D
R

Code Performance

S
M

Code Input

1
2
3
4

Code Output

J

K

L

M

W

H

Code Electrical Connections/Housing Material

1
2

Code Options

B1
B2
B3
B4
F2
F3
G1
G2
G7
G8

G9
GA
GB
GE
GF
GG

P1

(3)

R1

(1)

A1

Q4

K5

C6

I1

N1

(2)

E9

K7

(2)

EG

IG

1. Not available with stainless steel housing

2. Hazardous location approval options E9 and EG are currently not available on multirange performance units.

3. With option R1, the Type 846 and Model 3311 circuit board contains the Remote Pressure Reading feature. The Remote Pressure Reading jumper is placed in the ON position prior
to shipment.

Multirange (Typical Outputs: 3–27 psi, 6–30 psi, and 5–25 psi; Wide rangebility betweeen 0.5 and 33.0 psi)

Specify (Consult factory for other calibration requirements; minimum span is 6 psi for direct and 11 psi for

Standard (Typical Output: 3–15 psi; Wide rangebility betweeen 1 and 18 psi)

Specify (Consult factory for other input ranges between 4–20 mA and 10–50 mA)

0.2–1.0 kg/cm2 for direct action (1.0–0.2 kg/cm2 for reverse action)
3–27 psi for direct action (27–3 psi for reverse action) Multirange performance units only
6–30 psi for direct action (30–6 psi for reverse action) Multirange performance units only

Universal mounting bracket, epoxy painted carbon steel, carbon steel nuts and bolts

Universal mounting bracket, epoxy painted carbon steel, stainless steel nuts and bolts

316 SST universal mounting bracket, SST nuts and bolts for use with SST housing

316 SST universal mounting bracket, SST nuts and bolts for use with aluminum housing

Attach all applicable options at the factory (i.e., filter-regulator and gauges)

Factory Mutual (FM) explosion-proof and intrinsic safety approval

Canadian Standards Association (CSA) explosion-proof and intrinsic safety approval

Standards Association of Australia (SAA) flameproof intrinsic safety, and Type n certification

Typical Model Number: 3311 D S 1 J 1 B1

Direct—Output changes directly with input

Reverse—Output changes inversely with input

4–20 mA dc
4–12 mA dc

12–20 mA dc

3–15 psi for direct action (15–3 psi for reverse action)

0.2–1.0 bar for direct action (1.0–0.2 bar for reverse action)

reverse-acting units)

1/2–14 NPT/Aluminum

1/2–14 NPT/316 stainless steel

Filter-regulator, SST bolts

SST Filter-regulator, SST bolts
Supply gauge (0–60 psi/0–400 kPa/0–4 bar)
Output gauge (0–30 psi/0–200 kPa/0–2 bar)

Supply gauge (0–60 psi/0–4 kg/cm2)
Output gauge (0–30 psi/0–2 kg/cm2)

Output gauge (0–60 psi/0–400 kPa/0–4 bar)

SST Supply gauge (0–60 psi/0–400 kPa/0–4 bar)
SST Output gauge (0–60 psi/0–400 kPa/0–4 bar)

SST Output gauge (0–60 psi/0–4 kg/cm2)
SST Supply gauge (0–60 psi/0–4 kg/cm2)

Output gauge (0–60 psi/0–4 kg/cm2)

Module Cover with Multiple Ports
Remote pressure reading feature

Calibration data sheet

BASEEFA/CENELEC intrinsic safety certification

BASEEFA Type N certification

ISSeP/CENELEC flameproof certification

Russian GOST flameproof certification

Russian GOST intrinsic safety certification

Introduction

Companion Product: Model 272 Field Calibrator

The Rosemount Model 272 Field Calibrator can be
used to calibrate the I/P transducer. A
battery-operated, portable calibrator designed for

field use, the Model 272 features an adjustable 4–20
mA range, and selectable indication/simulation
modes. See product data sheet 00813-0100-4372.

1–7

Type 846 and Model 3311

Instruction Manual

Form 5739

February 2002

1–8

Instruction Manual

Form 5739
February 2002

Installation

Section 2 Installation2-2-

This section presents information on installing the
Type 846 and Model 3311 current-to-pressure
transducer. Figures 2-1, 2-2, 2-3, and 2-4 can be
used as references for instructions contained in this
section.

When a control valve is ordered with a Type 846 or
Model 3311 transducer specified to be mounted on
the actuator, the factory-mounted transducer is
connected to the actuator with the necessary tubing
and calibrated to the specifications on the order.

If the transducer is purchased separately for
mounting on a control valve already in service, all
the necessary mounting parts are furnished, if
ordered. This includes the appropriate bracket for
attaching the unit to an actuator boss (with tapped
holes) or for attaching it to the diaphragm casing.

If preferred, mounting parts can be supplied for
mounting the transducer on a 2-inch (51 mm)
diameter pipestand, a flat surface, or a bulkhead.

Transducers also can be ordered separately for
mounting on a control valve assembly already in
service. The transducer may be ordered with or
without mounting parts. Mounting parts include the
appropriate bracket and bolts for attaching the unit
to an actuator boss (with tapped holes) or for
attaching it to the diaphragm casing.

Mounting

The transducer is designed for mounting on a
control valve, 2-inch (51 mm) diameter pipestand,
wall, or panel. Figures 2-2, 2-3 and 2-4 show
recommended mounting configurations. The
mounting positions shown allow any moisture
buildup in the terminal compartment to drain to the
signal wire conduit entrance. Any moisture in the
pilot stage area will be expelled through the stroke
port without affecting pilot stage operation. In
applications with excessive moisture in the supply
air, vertical mounting allows the most effective
drainage through the stroke port.

Mounting is accomplished with an optional universal
mounting bracket. Before mounting the transducer,
note the following recommendations:

D Ensure that all bolts are fully tightened. The

recommended torque is 22 NSm (16 lbfSft).

D Bolts that connect to the transducer and to a
valve actuator should have the lock washer placed
directly beneath the bolt head and the flat washer
placed between the lock washer and bracket. All
other bolts should have the lock washer next to the
nut, and the flat washer placed between the lock
washer and bracket.

D Do not mount the transducer in a location
where foreign material may cover the stroke port or
exhaust port. See the descriptions of the stroke port
and exhaust port later in this section.

Pressure Connections

As shown in figure 2-1, all pressure connections are
1/4-18 NPT female connections. Use 3/8-inch (9.5
mm) outside diameter tubing for the supply and
output connections.

Supply Pressure

WARNING

Personal injury or property damage
may occur from an uncontrolled
process if the supply medium is not
clean, dry, oil-free, or non-corrosive
gas. Industry instrument air quality
standards describe 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 recommend
the level of filtration equipment
required to prevent performance
degradation 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 establishment of a
maintenance cycle to monitor its
operations is recommended.

WARNING

Personal injury or property damage
could result from fire or expolsion. Do
not operate transducers with the
CENELEC flameproof options at a
supply pressure in excess of 1.4 bar

2–1

Type 846 and Model 3311

129
(5.07)

119
(4.68)

NAMEPLATE

Instruction Manual

February 2002

CONDUIT CONNECTION
1/2 - 14 NPT

OUTPUT PORT
1/4 - 18 NPT

EXHAUST PORT
UNDERNEATH NAMEPLATE

35
(1.38)

Form 5739

STROKE PORT

TEST PINS

WIRING CONNECTION

MODULE COVER WITH

MULTIPLE PORTS

OUTPUT GAUGE PORT
1/4-18 NPT

POSITIVE
NEGATIVE

GROUND

59
(2.31)

110
(4.33)

102
(4.00)

29
(1.13)

29
(1.16)

COVER

REMOVAL

O-RING GROOVE
FOR FILTER
REGULATOR

SUPPLY PORT
1/4-18 NPT

5/16-18 (2)

2–2

B2473-1/IL

Figure 2-1. Dimensions and Connection Locations

(mm)
INCHES

Instruction Manual

Form 5739
February 2002

67

CLEARANCE

(2.62)

215
(8.48)

Installation

FOR PROPER MOISTURE
DRAINAGE THIS END
MUST BE UP

6
(.25)COVER REMOVAL

191
(7.51)

1

78
(3.08)

156
(6.15)

CENTERLINE
OF ACTUATOR

YOKE MOUNTED

NOTE:

1

THE MOUNTING POSITIONS SHOWN ALLOW ANY MOISUTRE BUILDUP IN THE TERMINAL COMPARTMENT
TO DRAIN TO THE SIGNAL WIRE CONDUIT ENTRANCE. DO NOT MOUNT THE TRANSDUCER WITH THE TERMINAL
COMPARTMENT COVER ON THE BOTTOM; MOISTURE MAY ACCUMULATE IN THE TERMINAL COMPARTMENT
OR PILOT STAGE, PREVENTING PROPER TRANSDUCER OPERATION. THE VERTICAL MOUNT IS MOST EFFECTIVE
FOR MOISTURE DRAINAGE IN WET APPLICATIONS.

14B7361-D
A6626–3/IL

Figure 2-2. Typical Dimensions with Type 67CFR Filter/Regulator and Gauges

MODULE
COVER
REMOVAL
CLEARANCE

137
(5.38)

13
(.50)

mm
(INCH)

(20 psi). Doing so invalidates the
CENELEC flameproof certifications
and could allow flames to spread from
the unit potentially igniting and
causing an explosion.

The supply medium must be clean, dry air or
noncorrosive gas that meets the requirements of
ISA Standard S7.3-1975. An output span of 0.2 to

1.0 bar (3 to 15 psi) requires a nominal supply
pressure of 1.4 bar (20 psi) and a flow capacity not
less than 0.11 m3/min (4 SCFM). For multirange
performance units with higher output spans, the
supply pressure should be at least 0.2 bar (3 psi)
greater than the maximum calibrated output
pressure.

The air supply line can be connected to the 1/4–18
NPT supply port, or to the supply port of a
filter-regulator mounted directly to the transducer.

Figures 2-2, 2-3, and 2-4 show all the installation
options.

The mounting boss for the air supply connection
contains two 5/16–18 UNC tapped holes that are
2-1/4 inches apart. The tapped holes allow direct
connection (integral mount) of a Type 67CFR
filter-regulator, if desired. When the filter-regulator is
factory mounted, the mounting hardware consists of
two 5/16–18 x 3-1/2 inch stainless steel bolts and
one O-ring. When the filter-regulator is field
mounted, the mounting hardware consists of two
5/16–18 x 3-1/2 inch stainless steel bolts, two
spacers (which may or may not be required) and two
O-rings (of which only one will fit correctly into the
housing O-ring groove and the other may be
discarded). This is due to the fact that the current
housing has been slightly modified from its original
design, hence, the additional hardware (if needed)
when field mounting the Type 67CFR filter-regulator.

2–3

Type 846 and Model 3311

Instruction Manual

Form 5739

February 2002

ADDITIONAL ADAPTER PLATE
PART NUMBER 03311-0318-0001
REQUIRED FOR I/P WITH
STAINLESS STEEL HOUSING

U BOLT

5/16-18 x 5/8 BOLTS

ADAPTER PLATE
(SEE DETAIL “B”)

MOUNTING BRACKET
(SEE DETAIL “A”)

41
(1.61)

VERTICAL MOUNT

FOR PROPER
MOISTURE
DRAINAGE,
THIS END
MUST BE UP

5/16-18 HEX NUT (4 PLACES)

3

1

MOUNTING BRACKET
(SEE DETAIL “A”)

ADAPTER PLATE
(SEE DETAIL “B”)

2-INCH PIPESTAND MOUNTING

5/16-18 x 3/4 BOLTS
(4 PLACES)

MOUNTING BRACKET (SEE DETAIL “A”)

2

FOR PROPER
MOISTURE
DRAINAGE,
THIS END
MUST BE UP

5/16-18 x 3/4 BOLTS (4 PLACES)

HORIZONTAL MOUNT

1

FOR PROPER MOISTURE
DRAINAGE, THE I/P
MUST BE MOUNTED ON
TOP OF THE PIPE

ADDITIONAL ADAPTER
PLATE PART NUMBER
03311-0318-0001
REQUIRED FOR I/P
WITH STAINLESS STEEL
HOUSING

1

32
(1.25)

WALL/PANEL MOUNTING

NOTES:

THE MOUNTING POSITIONS SHOWN ALLOW ANY MOISUTRE BUILDUP IN THE TERMINAL COMPARTMENT

1
TO DRAIN TO THE SIGNAL WIRE CONDUIT ENTRANCE. DO NOT MOUNT THE TRANSDUCER WITH THE TERMINAL
COMPARTMENT COVER ON THE BOTTOM; MOISTURE MAY ACCUMULATE IN THE TERMINAL COMPARTMENT
OR PILOT STAGE, PREVENTING PROPER TRANSDUCER OPERATION. THE VERTICAL MOUNT IS MOST EFFECTIVE
FOR MOISTURE DRAINAGE IN WET APPLICATIONS.

2

IF MOUNTED ON HORIZONTAL PIPE, THE I/P MUST BE ON TOP OF THE PIPE FOR PROPER MOISTURE DRAINAGE.
THIS DIMENSION IS 44 (1.74) FOR STAINLESS STEEL HOUSING.3

14B7332
19B9484-B
E0786 / IL

Figure 2-3. Typical Transducer Mounting with Universal Mounting Bracket

2–4

mm
(INCH)

Instruction Manual

Form 5739
February 2002

Installation

4 X 10 (0.375)

30
(1.18)

5 X 10 (0.375)

29
(1.13)

89
(3.50)

29
(1.16)

59
(2.312)

U-BOLT SLOTS
19 (0.75)

23
(.89)

89
(3.50)

FOR ALUMINUM HOUSING,
ALIGN 3 HOLES WITH I/P HOUSING

DETAIL A" MOUNTING BRACKET

38
(1.50)

29
(1.125

57
(2.25)

FOR STAINLESS STEEL HOUSING,
ALIGN 4 HOLES WITH I/P HOUSING

DETAIL B" ADAPTER PLATE

NOTE:

1. ATTACH THE BRACKET SHOWN IN DETAIL “A” TO THE TRANSDUCER

2. ATTACH THE ADAPTER PLATE SHOWN IN DETAIL “B” TO THE VALVE OR PIPE.

3. CONNECT THE TWO PIECES.

34B4990-C
34B5000-B
E0787

Figure 2-3. Typical Transducer Mounting with Universal Mounting Bracket (Continued)

Output Pressure

Connect the output signal line to the transducer at
the output port. The output port is 1/4–18 NPT, as
shown in figure 2-1. The output gauge port can be
used as an alternate signal port. If the gauge port is
used as a signal port, a threaded plug must be
installed in the output port.

The output gauge port allows connection of an
output gauge to provide local output signal
indication. The output gauge port is 1/4–18 NPT. If
an output gauge is not specified, a threaded plug is

2 X 10 (0.375)

4 X 5 (0.188)

shipped with the transducer. The plug must be
installed in the output gauge port when the port is
not used.

WARNING

The following conditions may cause
failure of the output gauge resulting in
personal injury, and damage to the
transducer and other equipment:

D pressure beyond the top of the

gauge scale.

mm
(INCH)

2–5

Type 846 and Model 3311

OUTPUT GAGE

FILTER­REGULATOR

SUPPLY
GAGE

81
(3.2)

Instruction Manual

Form 5739

February 2002

14B7332-D
E0776 / IL

COVER LOCK

49
(1.92)

72
(2.83)

TERMINAL
COMPARTMENT
COVER

TYPE 67CFR
14-18 NPT
SUPPLY CONN

TRANSDUCER WITH GAUGES

EXTERNAL EARTHING CONNECTION, SST TERMINAL
CLAMP AND SLOTTED M5 SCREW AND SPLIT
RING WASHER

3.62
(92)

HOUSING

9
(0.36)

1/4-18 NPT
OUTLET CONN
PLUGGED WHEN
GAUGE NOT
FURNISHED

162
(6.38)

2–6

B2465/IL

INTERNAL
HEX DRIVE
ROUND HEAD
SCREW (3 mm)

4.75
(121)

MODULE COVER

121
(4.75)

TRANSDUCER WITH CENELEC CERTIFICATION

Figure 2-4. Transducer Dimensions with CENELEC Certifications and Gauges

mm
(INCH)

Instruction Manual

Form 5739
February 2002

Installation

D excessive vibration.
D pressure pulsation.
D excessive instrument

temperature.

D corrosion of the pressure

containing parts.

D other misuse.

Refer to ANSI B40.1-1980. Do not use
on oxygen service.

Electrical Connections

WARNING

Personal injury or property damage
could result from fire or explosion. In
explosive atmospheres, remove power
and shut off the air supply to the I/P
unit before attempting to remove the
terminal compartment cover or
module cover. Failure to do so could
result in an electrical spark or
explosion.

Personal injury or property damage
may occur from an uncontrolled
process. Unscrewing the module
cover removes power from the
electronics and the output signal will
be 0.0 psi. Before removing the
module cover, ensure the process is
properly controlled.

CAUTION

Excessive current can damage the
transducer. Do not connect an input
current of more than 100 mA to the
transducer.

Signal wiring is brought to the terminal compartment
through a 1/2–14 NPT housing conduit connection,
shown in figure 2-1. Where condensate is common,
use a conduit drip leg to help reduce liquid buildup in
the terminal compartment and avoid shorting of the
input signal. Electrical connections are made at the
terminal block. An internal grounding lug is provided
to facilitate a separate ground when required. As
shown in figure 2-4, units with CENELEC
certification also have an external earthing

connection. The use of shielded cable will ensure
proper operation in electrically noisy environments.

Connect the positive signal lead to the positive
terminal, marked +. Connect the negative signal
lead to the negative terminal, marked –.

Note

Units with the Remote Pressure
Reading (RPR) option may cause
interference with the analog output
signal from some instrumentation
systems. This problem may be solved
by placing a 0.2 microfarad capacitor
or a HART filter across the output
terminals.

WARNING

Personal injury or property damage
could result from an uncontrolled
process. Unscrewing the module
cover removes power from the
electronics and the output signal will
be 0.0 psi. Before removing the
module cover, ensure the process is
properly controlled.

Stroke Port

WARNING

Personal injury or property damage
could result from fire or explosion of
accumulated gas. During normal
operation, supply air is vented to the
atmosphere through the stroke port in
the module cover and exhaust port
(located under the nameplate). If a
flammable gas is used as the supply
air, the area into which it is vented
must be classified as a Division I
hazardous area. Adding a remote vent
to the stroke port is not sufficient to
permit safe operation in a hazardous
area.

The constant bleed of supply air from the pilot stage
is directed out the stroke port, which is a screened
hole located at the center of the module cover.
Figure 2-1 shows the location of the stroke port.
Before installing the transducer, ensure the stroke

2–7

Type 846 and Model 3311

port is clear. Do not mount the transducer in a
location where foreign material may cover the stroke
port. For information on using the stroke port, refer
to Section 5 – Troubleshooting.

Exhaust Port

The transducer exhausts through a screened port
located beneath the instrument nameplate. Figure
2-1 shows the location of the exhaust port. The
nameplate holds the screen in place. Exhaust will
occur with a reduction in output pressure. The
transducer should not be mounted in a location
where foreign material may clog the exhaust port.

Signal Interruption

Upon loss of input current, or if input current
decreases below 3.3 0.3 mA, the output of the
direct action unit will decrease to less than 0.1 bar
(1 psi).

Instruction Manual

Form 5739

February 2002

In the same situation, the output of the reverse
action unit will increase to near supply pressure.

2–8

Instruction Manual

Form 5739
February 2002

Section 3 Calibration3-3-

Calibration of the Type 846 and Model 3311 requires
either an accurate current generator or an accurate
voltage generator with a precision 250-ohm, 1/2-watt
resistor. Figure 3-1 shows how to connect either
device.

Calibration also requires a precision output indicator
and a minimum nonsurging air supply of 5.0 Normal
m3/hr (3 SCFM) at 1.4 bar (20 psi) for standard
performance units. For multirange performance
units, the air supply must be at least 0.2 bar (3 psi)
greater than the maximum calibrated output
pressure, up to 2.4 bar (35 psi) maximum.

For ease of calibration, the output load volume,
including the output tubing and output indicator,
should be a minimum of 33 cm3 (2 cubic inches).
Review the information under Signal Interruption in
Section 2 before beginning the calibration
procedure.

ADJUST THE CURRENT
SOURCE TO PROVIDE
THE 4 AND 20 mA
SET POINTS

CALIBRATION USING A CURRENT SOURCE

TO OBTAIN THE 4 AND 20mA
SET POINTS, ADJUST THE
VOLTAGE SOURCE (VS) SO
THE VOLTMETER (VM) READS
1 AND 5 VOLTS, RESPECTIVELY,
ACROSS THE 250 ohm RESISTOR

A6644-1 / IL

Figure 3-1. Connecting a Current or Voltage

CALIBRATION USING A VOLTAGE SOURCE

Source for Calibration

Calibration

Before calibration, determine the type of input (full or
split range), and the type of output action (direct or
reverse). Consult the factory for split range output
calibration. Also, determine if the unit offers
standard or multirange performance. The unit
supports eight basic input/output combinations:

Standard Performance

D Full Range Input, Direct Action
D Split Range Input, Direct Action
D Full Range Input, Reverse Action
D Split Range Input, Reverse Action

Multirange Performance

D Full Range Input, Direct Action
D Split Range Input, Direct Action

(1)

D Full Range Input, Reverse Action
D Split Range Input, Reverse Action

(1)

Table 3-1 lists the various input and output ranges
over which the unit may be calibrated.

The input range is selected by changing the position
of a jumper located on the electronic circuit board.

Refer to Electronic Circuit Board in Section 6, and
figure 6-5 for the location and instruction on
placement.

CAUTION

Excessive current can damage the
transducer. Do not connect an input
current of more than 100 mA to the
transducer.

Standard Performance: Full Range Input, Direct Action

Use the following procedure to achieve a standard

0.2 to 1.0 bar (3 to 15 psi) output span for a 4 to 20
mA input signal:

1. Remove the module final assembly from the
housing. Refer to Removing the Module Final
Assembly in Section 6 for an explanation of how to
disengage the module final assembly.

2. Confirm that the unit is direct acting. A green
electronic circuit board identifies direct-acting units.
Refer to Action under the heading Electronic
Circuit Board in Section 6 for more information on
direct acting units.

3. Position the range jumper in the Hi position for
High Range. Figure 6-5 shows the circuit board
jumper positions.

4. Replace the module final assembly in the
housing. Refer to Replacing the Module Final

1. Consult factory for calibration of multirange performance units with split range
input or split range output, or both.

3–1

Type 846 and Model 3311

Table 3-1 Type 846 and Model 3311 I/P Rangeability Matrix

Input

Input

Range

4–20

4–12
12–20

Common Ranges Misc. Std. Split High Range Splits

3–15

.5–30

(S,M)

n n n n n

n
n

3–27

(M)

n n

(M)

6–30

(M)

n

J

J

Output Pressure Range (psi) (Performance Code)

5–25

0.5–6

(M)

(S,M)

D

n

D

J

D

.5–18
(S,M)

n

n

J

3–9

(S,M)

D D

D
D

9–15

(S,M)

D
D

.5–15
(S,M)

n

n

J

15–30

(M)

U U

U

n

15–27

(M)

U

n

Instruction Manual

Form 5739

February 2002

6–18

18–30

(S,M)

n

n
n

(M)

U

U

n

5–15

(S,M)

n

n
n

15–25

(M)

U

U

n

4–8

8–12
12–16
16–20

10–50 Consult I/P Marketing

S=Standard Performance Unit
M=Multirange Performance Unit
n=Available in Direct or Reverse Action
D=Available in Direct Action Only
J=Available, but if the desired calibration cannot be achieved by adjusting the zero/span screws, unit may require Hi/Lo jumper to be moved. The jumper is located on the circuit board
assembly, and is usually in the Hi position. Disengaging the master module and moving the jumper to the Lo position will allow calibration to the desired range.
U=Special Build Required.

n
n

J
J

Assembly in Section 6 for an explanation of how to
engage the module final assembly.

n
n

J
J

n

n

n

n

J

n

J

J

n
n

J
J

n
n

J
J

11. Apply a 20.0 mA (Vm = 5.0 V) signal, and adjust
the span screw to achieve a 1.0 bar (15.0 psi)
output. The output increases with clockwise rotation

5. Connect the air supply to the air supply port.

6. Connect a precision output indicator to the output
signal port.

of the span screw.

12. Repeat Steps 10 and 11 to verify and complete
the calibration.

7. Make sure that the output gauge port has an
output gauge or a threaded plug installed. A
threaded plug is provided for units shipped without
output gauges.

8. Remove the terminal compartment cover.

Multirange Performance: Full Range

(2)

Input,

Use the following procedure with a multirange

Direct Action

performance unit to achieve the desired direct action

9. Connect the current source (or voltage source)

output span for a 4 to 20 mA input signal:
positive lead (+) to the terminal block positive (+)
and the current source (250-ohm resistor lead)
negative lead (–) to the terminal block negative (–).
Refer to figure 3-1.

1. Perform steps 1 through 9 of the calibration

procedure for Standard Performance: Full Range

Input, Direct Action.

CAUTION

Excessive current can damage the
transducer. Do not connect an input
current of more than 100 mA to the
transducer.

10. Apply a 4.0 mA (Vm = 1.0 V) signal, and adjust
the zero screw to achieve a 0.2 bar (3.0 psi) output.
The output increases with clockwise rotation of the
zero screw.

2. Consult factory for calibration of multirange performance units with split range
input.

3–2

2. Apply a 4.0 mA (Vm = 1.0 V) signal, and adjust

the zero screw to achieve the desired lower limit of

the output range. The lower limit must be between

0.03 and 0.6 bar (0.5 and 9.0 psi). The output

increases with clockwise rotation of the zero screw.

3. Apply a 20.0 mA (Vm = 5.0 V) signal, and adjust

the span screw to achieve the desired upper limit of

the output range. The span must be at least 0.4 bar

(6.0 psi). The maximum upper limit is 2.0 bar (30.0

psi). The output increases with clockwise rotation of

the span screw.

4. Repeat steps 2 and 3 to verify and complete the

calibration.

Instruction Manual

Form 5739
February 2002

Calibration

Standard Performance: Split Range Input, Direct Action

4 to 12 mA Input Signal

Use the following calibration procedure to produce a

0.2 to 1.0 bar (3 to 15 psi) output span for a 4 to 12
mA input signal:

1. Perform steps 1 through 9 of the calibration
procedure for Standard Performance: Full Range

Input, Direct Action.

2. Apply an input of 4.0 mA (Vm = 1.0 V), and
adjust the zero screw to achieve an output of 0.2 bar
(3.0 psi).

3. Apply an input of 12.0 mA (Vm = 3.0 V), and
adjust the span screw to achieve an output of 1.0
bar (15.0 psi).

4. Repeat steps 2 and 3 to verify and complete the
calibration.

12 to 20 mA Input Signal

Use the following calibration procedure to produce a

0.2 to 1.0 bar (3 to 15 psi) output span for a 12 to 20
mA input signal:

Note

There may be some span interaction
with zero in this range, and the
following steps compensate for this.

1. Perform steps 1 through 9 of the calibration
procedure for Standard Performance: Full Range

Input, Direct Action.

2. Apply an input of 4.0 mA (Vm = 1.0 V), and
adjust the zero screw to achieve an output of 0.2 bar
(3.0 psi).

3. Apply an input of 12.0 mA (Vm = 3.0 V), and
adjust the span screw to achieve an output of 1.0
bar (15.0 psi).

4. Maintain the input of 12.0 mA (Vm = 3.0 V), and
adjust the zero screw to achieve an output of 0.2 bar
(3.0 psi). The unit may not turn down this low; if it
does not, go to step 7.

5. If the output reaches 0.2 bar (3.0 psi) in step 4,
apply an input of 20.0 ma (Vm = 5.0 V) and note the
error (the actual reading versus 15.0 psi). Adjust the
span screw to overcorrect the error by a factor of
two. For example, if the reading was 0.9 bar (14.95
psi), adjust the span screw to achieve an output of

1.1 bar (15.05 psi).

6. Repeat steps 4 and 5 to verify and complete the

calibration.

7. Turn off the air supply. Remove the module final

assembly from the housing. Place the range jumper

in the Lo position for Low Range, as indicated in

figure 6-5. Replace the module final assembly. Turn

on the air supply.

8. Apply an input of 12.0 mA (Vm = 3.0 V), and

adjust the zero screw to achieve an output of 0.2 bar

(3.0 psi).

9. Apply an input of 20.0 mA (Vm = 5.0 V), and

note the error (the actual reading versus 15.0 psi).

Adjust the span screw to overcorrect the error by a

factor of two. For example, if the reading was 0.9

bar (14.95 psi), adjust the span screw to achieve an

output of 1.1 bar (15.05 psi).

10. Repeat steps 8 and 9 to verify and complete the

calibration.

Standard Performance: Full Range

Input, Reverse Action

Use the following procedure on reverse action units

to achieve a 1.0 to 0.2 bar (15 to 3 psi) output span

for a 4 to 20 mA input signal:

1. Perform steps 1 through 9 under Standard

Performance: Full Range Input, Direct Action,

except for step 2. In place of step 2, confirm that the

unit is reverse acting. A red electronic circuit board

identifies reverse-acting units. Refer to Action under

the heading Electronic Circuit Board in Section 6

for more information on reverse acting units.

2. Apply an input of 4.0 mA (Vm = 1.0 V), and adjust

the zero screw to achieve an output of 1.0 bar (15.0

psi).

3. Apply an input of 20.0 mA (Vm = 5.0 V), and

adjust the span screw to achieve an output of 0.2

bar (3.0 psi).

4. Repeat steps 2 and 3 to verify and complete the

calibration.

Multirange Performance: Full Range

(2)

Input

Use the following procedure with a multirange unit to

achieve the desired reverse action output span for a

4 to 20 mA input signal:

1. Perform steps 1 through 9 of the calibration

procedure for Standard Performance: Full Range

Input, Direct Action, except for step 2. In place of

step 2, confirm that the unit is reverse acting. A red

, Reverse Action

3–3

Type 846 and Model 3311

Instruction Manual

Form 5739

February 2002

electronic circuit board identifies reverse-acting
units. Refer to Action under the heading Electronic
Circuit Board in Section 6 for more information on
reverse acting units.

2. Apply an input of 4.0 mA (Vm = 1.0 V), and
adjust the zero screw to achieve the desired upper
limit of the output range. The 4 mA point must be
between 0.6 and 2.0 bar (9.0 and 30.0 psi). The
output increases with clockwise rotation of the zero
screw.

3. Apply an input of 20.0 mA (Vm = 5.0 V), and
adjust the span screw to achieve the desired lower
limit of the output range. The span must be at least

0.7 bar (11.0 psi). The lower limit of the 20.0 mA
setting is 0.03 bar (0.5 psi). The output increases
with clockwise rotation of the span screw.

4. Repeat steps 2 and 3 to verify and complete the
calibration.

Standard Performance: Split Range Input, Reverse Action

4 to 12 mA Input Signal

Use the following procedure on reverse action units
to achieve a 1.0 to 0.2 bar (15 to 3 psi) output signal
for a 4 to 12 mA input signal:

1. Perform steps 1 through 9 of the calibration
procedure for Standard Performance: Full Range
Input, Direct Action, except for step 2. In place of
step 2, confirm that the unit is reverse acting. A red
electronic circuit board identifies reverse-acting
units. Refer to Action under the heading Electronic
Circuit Board in Section 6 for more information on
reverse acting units.

2. Apply an input of 4.0 mA (Vm = 1.0 V), and adjust
the zero screw to achieve an output of 1.0 bar (15.0
psi).

3. Apply an input of 12.0 mA (Vm = 3.0 V), and
adjust the span screw to achieve an output of 0.2
bar (3.0 psi).

4. Repeat steps 2 and 3 to verify and complete the
calibration.

12 to 20 mA Input Signal

Use the following procedure on reverse action units
to achieve a 1.0 to 0.2 bar (15 to 3 psi) output signal
for a 12 to 20 mA input signal:

Note

There may be some span interaction
with zero in this range, and the
following steps compensate for this.

1. Perform steps 1 through 9 of the calibration

procedure for Standard Performance: Full Range

Input, Direct Action, except for step 2. In place of

step 2, confirm that the unit is reverse action. A red

electronic circuit board identifies reverse-acting

units. Refer to Action under the heading Electronic

Circuit Board in Section 6 for more information on

reverse acting units.

2. Apply an input of 4.0 mA (Vm = 1.0 V), and adjust

the zero screw to achieve an output of 1.0 bar (15.0

psi).

3. Apply an input of 12.0 mA (Vm = 3.0 V), and

adjust the span screw to achieve an output of 0.2

bar (3.0 psi).

4. Maintain the input of 12.0 mA (Vm = 3.0 V), and

adjust the zero screw to achieve an output of 1.0 bar

(15.0 psi). The unit may not turn up this high; if it

does not, go to step 7.

5. If the output reaches 15.0 psi in step 4, apply an

input of 20 mA, and adjust the span screw to

achieve a 3.0 psi output. Apply an input of 20 mA

(Vm = 5.0 V), and note the error (the actual reading

versus 3.0 psi). Adjust the span screw to overcorrect

the error by a factor of two. For example, if the

reading was 2.95 psi, adjust the span screw to

achieve an output of 3.05 psi.

6. Repeat steps 4 and 5 to verify and complete the

calibration.

7. If the 12.0 mA (Vm = 3.0 V) cannot be adjusted to

1.0 bar (15.0 psi) in step 4, turn off the air supply.

Remove the module final assembly from the

housing. Place the range jumper in the Lo position

for Low Range, as shown in figure 6-5. Replace the

module final assembly. Turn on the air supply.

8. Apply an input of 12.0 mA (Vm = 3.0 V), and

adjust the zero screw to achieve an output of 1.0 bar

(15.0 psi).

9. Apply an input of 20 mA (Vm = 5.0 V), and note

the error (the actual reading versus 3.0 psi). Adjust

the span screw to overcorrect the error by a factor of

two. For example, if the reading was 2.95 psi, adjust

the span screw to achieve and output of 3.05 psi.

10. Repeat steps 8 and 9 to verify and complete the

calibration.

3–4

Instruction Manual

Form 5739
February 2002

Calibration

10–50 mA Input Signal

Use the previous procedures and replace 4–20 mA
references with the appropriate 10–50 mA numbers;
for example:

D 4 mA = 10 mA

D 12 mA = 30 mA

D 20 mA = 50 mA

Note

10–50 mA available only with direct
acting units.

Transporting the Module Final

Assembly

The transducer allows the module final assembly to

be removed while the housing is in its installed

position. In the event the transducer does not

function properly, an operational module final

assembly can be taken to the field and exchanged

with the nonfunctional module.

After the transducer is calibrated in the shop, the

module final assembly can be removed from the

housing. At the time the span and zero screws

disengage, there will be minimal effect on the

calibrated span. The calibrated module can now be

taken to the field. Ensure that the span and zero

potentiometers are not moved from their calibrated

positions.

3–5

Type 846 and Model 3311

Instruction Manual

Form 5739

February 2002

3–6

Instruction Manual

Form 5739
February 2002

Principle of Operation

Section 4
Principle of Operation4-4-

The following paragraphs describe the functional
parts of the Type 846 and Model 3311. Figure 4-1
shows the block diagram.

Electronic Circuit

During operation, the input current signal is received
by the transducer’s electronic circuit and compared
to the output pressure from the booster stage. A
solid-state pressure sensor is part of the electronic
circuit and monitors the booster stage output. The
silicon-based sensor uses strain gauge thin film
technology.

The sensor’s pressure signal is fed to a simple
internal control circuit. By using this patented
technique, the transducer’s performance is set by
the sensor/circuit combination. Changes in output
load (leaks), variations in supply pressure, or even
component wear are sensed and corrected by the
sensor/circuit combination. Electronic feedback
allows crisp dynamic performance and readily
compensates for output changes induced by
vibration.

The actuator performs the task of converting

electrical energy (current) to motion. It uses a

patented, coaxial moving magnet design optimized

for efficient operation and is highly damped at its

mechanical resonance. A silicone rubber diaphragm

protects its working magnetic gaps from

contamination.

Pilot Stage

The patented pilot stage contains two opposed fixed

nozzles: the supply nozzle and the receiver nozzle.

It also contains the deflector, which is the moving

element.See figures 4-2 and 4-3. The supply nozzle

is connected to the supply air and provides a

high-velocity air stream. The receiver nozzle

captures the air stream and converts it back to

pressure. The receiver nozzle pressure is the output

pressure of the pilot stage.

To vary the pilot output pressure, the high-velocity

stream is diverted away from the receiver nozzle by

the deflector, which is a cylindrical, aerodynamic

body located between the two nozzles.

Note

Because the transducer is electronic
in nature, it is not well-modeled in the
loop as a simple resistor in series with
an inductor. Also it is better thought
of as a 50-ohm resistor in series with a

6.0 V voltage drop, with negligible
inductance.

This is important when calculating the loop load.
When the transducer is used in series with a
microprocessor-based transmitter, the noninductive
nature of the transducer allows digital signals to
successfully pass through undistorted.

Magnetic Actuator

The electronic circuit controls the level of current
flowing through the actuator coil, which is located in
the pilot/actuator assembly. A change to the level of
coil current is made by the electronic circuit when it
senses a discrepancy between the pressure
measured by the sensor and the pressure required
by the input signal.

In response to a change in actuator coil current, the

deflector is repositioned between the nozzles. There

is a linear relationship between the coil current and

the pilot stage output pressure. For direct action

units, the power-off, or fail-safe, position of the top

of the deflector is near the center of the stream and

results in nearly zero pilot output pressure. As the

coil is energized, the deflector is drawn out of the

stream.

For reverse action units, the power-off, or fail-safe,

position of the deflector is completely out of the

stream. The result is maximum pilot output pressure.

As the coil is energized, the deflector moves into the

stream, resulting in a decreased pilot output

pressure.

The deflector material is tungsten carbide, and the

nozzles are 316 stainless steel. The nozzles have a

large bore of 0.41 mm (0.016 inches), which

provides good resistance to plugging.

4–1

Type 846 and Model 3311

4 to 20 MA
INPUT

ELECTRONIC CIRCUIT

MAGNETIC ACTUATOR

SOLID-STATE

PILOT STAGE

BOOSTER STAGE

PRESSURE
SENSOR

Instruction Manual

Form 5739

February 2002

TO VALVE ACTUATOR

A6324-1/IL

3 TO 15 PSI
OUTPUT, TYPICAL

Figure 4-1. Functional Parts Block Diagram

REGULATED
AIR SUPPLY

REGULATED
AIR SUPPLY

A6645/IL

Figure 4-3. Deflector/Nozzle Pilot Stage Operation (Direct Action)

W6287/IL

HIGH OUTPUT PRESSURE

LOW OUTPUT PRESSURE

Figure 4-2. Detail of Deflector/Nozzle Pilot Stage

PRESSURE TO
BOOSTER STAGE

DEFLECTED NOZZLE
FLOW PATTERN

PRESSURE TO
BOOSTER STAGE

Booster Stage

The receiver nozzle pressure controls the booster
stage, which has a poppet valve design. An increase
in receiver nozzle pressure positions the valving in
the booster stage to produce an increase in the
transducer output signal. A decrease in the receiver
nozzle pressure positions the valving in the booster
stage to allow exhaust to occur, decreasing the
output signal.

4–2

The booster stage operates using a 3:1 pressure

gain from the pilot stage. High flow rate capability is

achieved by large flow area poppet design and

internal porting having low flow resistance. The

booster stage design provides very good stability in

high vibration applications, and the poppet valve

technology provides resistance to plugging.

Instruction Manual

Form 5739
February 2002

Troubleshooting

Section 5 Troubleshooting5-5-

The modular design and unitized subassemblies of
the Type 846 and Model 3311 allow for quick and
easy troubleshooting and repair. This section
presents information on the diagnostic features and
procedures for troubleshooting both models in
service or in the shop.

Diagnostic Features

If a control loop does not perform properly and the
cause of malfunction has not been determined, two
features of the transducer can be used to determine
if the transducer is at fault: the stroke port and
Remote Pressure Reading.

Stroke Port

The stroke port provides a way to quickly increase
the transducer output, giving a rough measure of the
unit’s functionality. A hole in the module cover vents
the constant bleed from the pilot stage. When the
hole is covered, pressure at the pilot stage receiver
nozzle increases, which in turn increases the output.
Output pressure will increase to within 2 psi of
supply pressure for either direct or reverse action. If
output pressure does not increase to this level, it
may indicate that supply air is not reaching the pilot
stage or that a pilot stage nozzle is plugged.

A jumper on the circuit board activates the Remote

Pressure Reading function. Section 6 Maintenance

provides instruction on positioning the jumper. The

jumper, shown in figure 6-5, has two positions: N for

ON, or D for OFF. The RPR jumper is in the N (ON)

position when the unit ships from the factory, unless

otherwise specificed.

Using the HARTR Communicator to Read the RPR

Signal

The RPR frequency signal can be measured at any

location along the two input wires using a HART

Communicator. The HART Communicator displays

both the output frequency in Hertz and the

transducer output pressure in psi. Figure 5-1 shows

the wiring connections.

The transducer is not a microprocessor-based

transmitter and therefore does not identify itself to

the HART Communicator. For this reason, the

HART Communicator displays a screen telling the

user it cannot verify that the transducer is on the

loop.

Neither the HART Communicator nor the Remote

Pressure Reading function are intended to be used

for calibration. They are intended as a diagnostic

feature. The accuracy of the Remote Pressure

Reading function when used in conjunction with the

HART Communicator is typically ±3% of span and

guaranteed to be a maximum of ±6% of span.

Note

If the stroke port diagnostic feature is
not desired, the transducer is
available with an optional cover that
contains multiple stroke ports, as
shown in figure 2-1. This prevents
increasing the output by covering the
stroke port.

Remote Pressure Reading (RPR)

Remote Pressure Reading (RPR) is an optional
diagnostic feature that enables the user to determine
the output pressure from any location along the
signal wire path. For loop troubleshooting, this
allows the user to confirm the functionality of the
transducer from a remote location.

A frequency signal directly proportional to the output
pressure is superimposed on the input signal loop.
The frequency range of the RPR function is 5,000 to
8,000 Hz.

Note

When the output of a smart
transmitter is used as the input to the
transducer, the HART Communicator
will not recognize the frequency
signal of the transducer. Enabling the
RPR feature on the transducer can
also cause errors when trying to
communicate with a smart transmitter
using a HART Communicator. For
these reasons, you should disable the
RPR feature on the transducer when
using this type of loop.

Use the ON/OFF key (figure 5-2) to turn the HART

Communicator on and off. When the communicator

is turned on, it searches for a HART compatible

device on the 4 to 20 mA loop. If a device is not

found, then the communicator displays the

message, ‘‘No Device Found. Press OK.’’ Press OK

(F4) to display the Main menu (figure 5-3).

If a HART-compatible device is found, the

communicator displays the Online menu.

5–1

Type 846 and Model 3311

CONTROLLER

POWER
SUPPLY

NOTE:

1

IF A HART COMMUNICATOR IS NOT AVAILABLE, A FREQUENCY COUNTER
CAN BE USED IN ITS PLACE. SEE TEXT TO CONVERT THE FREQUENCY DISPLAY
TO OUTPUT PRESSURE

B2466/IL

Figure 5-1. Wiring Connections for the HARTR Communicator or a Frequency Counter

FREQUENCY
COUNTER

Instruction Manual

Form 5739

February 2002

TEST
PINS

POSITIVE
NEGATIVE

GROUND

A6646/IL

Figure 5-2. HART Communicator ON/OFF Key

A6647/IL

Figure 5-3. HART Communicator Main Menu

When the HART Communicator is not connected to
a HART compatible device, the first menu to appear
after powering is the Main menu.

From within the Main menu, you can access the
Frequency Device menu (figure 5-4) by pressing
the 4 key.

A6648/IL

Figure 5-4. HART Communicator Frequency Device Menu

Using a Frequency Counter to Read the RPR

Signal

A frequency counter also can be used for Remote

Pressure Reading. The frequency counter displays

the RPR output in the same manner as the HART

communicator, but the output frequency must be

converted to output pressure using a simple

mathematical formula. To determine the output

pressure, subtract 5,000 Hz from the frequency

displayed on the frequency counter, and then divide

by 100.

Conversion Formula

Display Hz – 5,000 Hz

100

 psig

Example:

5,311 Hz – 5, 000 Hz

100

 3.11 psig

5–2

Instruction Manual

Form 5739
February 2002

Troubleshooting

TROUBLESHOOTING

FROM THE

CONTROL ROOM

TROUBLESHOOTING

IN THE

FIELD

NOTE:
AFTER FINAL CORRECTIVE ACTION, CHECK LOOP OPERATION.
IF NOT OK, RESTART TROUBLESHOOTING PROCEDURE.
REFER TO REPLACING THE MODULE FINAL ASSEMBLY

1

IN SECTION 6.

C0789/IL

Figure 5-5. Field Troubleshooting Flowchart

Note

The Remote Pressure Reading (RPR)
frequency signal has an amplitude of

0.4 to 1.0 V peak-to-peak. If other
noise (frequency) with a comparable
or greater amplitude is present on the
line, it may make the RPR frequency
signal unreadable.

In-service Troubleshooting

A number of simple checks can be made on the

transducer while the unit is in service. Figure 5-5

shows a troubleshooting flowchart.

1. Make sure that the module cover is tight. The

cover should be hand-tightened and then advanced

1/4 to 1/2 turn (24 to 27 NSm) (18 to 20 lbfSft).

5–3

Type 846 and Model 3311

Instruction Manual

Form 5739

February 2002

2. Confirm the general functionality of the unit by
using the diagnostic features described earlier in this
section.

3. Confirm that the filter-regulator is not full of water
or oil and that supply air is reaching the unit. The air
supply pressure should be at least 0.2 bar (3 psi)
greater than the maximum calibrated output
pressure.

4. Confirm that there are no major leaks in the
output signal line or from the output gauge port.

5. Confirm that there are no obstructions and the
screens are clean in the stroke port or the exhaust
port.

WARNING

Personal injury or property damage
could result from an uncontrolled
process. Unscrewing the module
cover removes power from the
electronics and the output signal will
be 0.0 psi. Before removing the
module cover, ensure the process is
properly controlled.

9. Remove the terminal compartment cover (see

Warning above), and, using a digital voltmeter,

check the voltage between the transducer positive

(+) and negative (–) terminals. The voltage should

measure 6.0 to 8.2 V. A lower voltage can indicate a

short in the input wires or defective controller. No

voltage can indicate an open circuit in the control

loop. A voltage of greater than 8.5 volts indicates a

problem with the transducer, a faulty or corroded

connection at the transducer, or an overcurrent

condition. Replace the module final assembly. If the

voltage is still not in the proper range (6.0 to 8.2 V),

remove the terminal block and terminal block

connection board. Apply power to the electrical

feedthroughs. (Note the polarity of the feedthroughs,

shown in figure 6-9.) Recheck the voltage. If the

voltage is in the proper range, replace the terminal

block and terminal block connection board. If the

voltage is still not in the proper range, replace the

housing.

10. Prepare to remove the module final assembly

from the housing, or to remove the transducer from

its mounting bracket. Refer to Module Final

Assembly in Section 6 for instructions on removing

the module final assembly from the module housing.

WARNING

WARNING

Personal injury or property damage
could result from fire or an explosion.
In explosive atmospheres, remove
power and shut off the air supply to
the transducer before attempting to
remove the terminal compartment
cover or module cover. Failure to do
so could result in an electrical spark
or explosion.

6. If applicable, remove the cover lock and screw to
allow access to the terminal compartment cover.

7. Remove the terminal compartment cover (see
Warning above), and use a milliammeter, or a digital
voltmeter to confirm that proper input current is
supplied to the transducer.

8. Remove the terminal compartment cover (see
Warning above), and short the loop across the
positive (+) and the negative (–) terminals to check
the output. The output should be nearly 0 psi. If the
output is not 0 psi, replace the module final
assembly.

Personal injury or property damage
could result from an uncontrolled
process. Unscrewing the module
cover removes power from the
electronics and the output signal will
be 0.0 psi. Before removing the
module cover, ensure the process is
properly controlled

With the module final assembly removed from the

housing, the following checks can be made.

1. Review the position of the Remote Pressure

Reading jumper (if so equipped) and range jumper

to confirm that they are placed in the desired

position. Refer to Electronic Circuit Board in

Section 6, and figure 6-5 for the location of these

jumpers and instructions on placement.

2. Observe the position and condition of the three

module O-rings to confirm they make a tight seal.

3. Verify that the O-ring is correctly positioned in the

groove on the flat face of the module cover. Refer to

figure 6-9 for an exploded view.

4. Inspect the porting on the module final assembly

to determine if large amounts of contaminants have

entered the transducer.

5–4

Instruction Manual

Form 5739
February 2002

Troubleshooting

Before making the following checks, disconnect both
signal wires from the transducer, and ensure the
module final assembly is removed from the housing.

1. Using an ohmmeter, check the electrical
connections in the housing terminal compartment.
The circuit should show an open between the
positive (+) and negative (–) terminals. If not,
replace the housing or terminal block and connection
board.

2. Use a wire jumper to connect the two electrical
feedthroughs located in the module compartment.
The resistance between the positive (+) and
negative (–) terminals in the terminal compartment
should be 10 ohms. If not, check the electrical
feedthroughs for short or open circuits. If a short or
open circuit is found, replace the housing.

3. With the electrical feedthroughs jumpered as
stated above, connect the ohmmeter to either the
positive (+) or negative (–) terminal and the
grounding lug. The circuit should show an open. If
not, check for a short to the housing.

4. Remove the module from the module cover and
inspect the pilot/actuator assembly for damage or
clogging.

Some of the previous troubleshooting steps may be
inconvenient to perform in the field. It may be best to
make use of the modular design of the Type 846 or
Model 3311, and keep a spare, calibrated module
final assembly available for exchange. If the module
final assembly is to be transported to the shop for
repair, first remove it from the module cover. Attach
the spare module final assembly to the module
cover. Refer to Module Final Assembly in Section
6 for complete instructions. The nonfunctioning
module can then be returned to the shop for
troubleshooting.

Troubleshooting in the Shop

The three subassemblies are the pilot/actuator

assembly, the electronic circuit board, and the

module subassembly. The module subassembly

consists of the module final assembly with both the

pilot/actuator assembly and electronic circuit board

removed.

1. Remove the pilot/actuator assembly. Refer to

Pilot/Actuator Assembly in Section 6 for complete

removal information.

a. Inspect the nozzles and deflector. If they
show a buildup of contaminants, clean the
nozzles by gently inserting a wire with a
maximum diameter of 0.38 mm (0.015 inches).
Clean the deflector, if necessary, by spraying
with contact cleaner.

CAUTION

Do not apply force to the deflector bar
while cleaning the nozzles. Doing so
could alter the alignment or disable
the deflector bar mechanism.

CAUTION

Do not use chlorinated solvents for
cleaning the pilot/actuator assembly.
The chlorinated solvents will
deteriorate the rubber diaphragm.

If the entire transducer is brought to the shop for
troubleshooting, then the preceding sequence
applies. If only the module final assembly has been
brought to the shop, then use another Type 846 or
Model 3311 housing as a test fixture. Insert the
module into the test fixture. Perform the previous
steps (as they apply) of the In-service
Troubleshooting procedure.

To further aid troubleshooting, the module final
assembly can be broken down into three
subassemblies. The troubleshooting sequence
consists of exchanging the subassemblies with
known working ones to determine which is at fault.

b. Make sure the O-rings are lightly lubricated
with silicone grease and properly seated.

c. Reassemble and check operation.

d. If after cleaning the transducer does not
function, replace the pilot/actuator assembly with
a new one.

e. Reassemble and check operation.

5–5

Type 846 and Model 3311

2. Remove the electronic circuit board from the
module final assembly. Section 6—Maintenance
describes how to remove the board.

a. Inspect the O-rings around the sensor for
damage and replace them if necessary.

b. Check the sensor port and areas around the
sensor for foreign material, and clean if
necessary.

c. Reassemble and check operation.
d. If the transducer does not function, replace

the electronic circuit board with a new one. Refer
to Electronic Circuit Board in Section 6 for
complete removal information.

e. Reassemble and check operation.

3. The module subassembly is aligned at the
factory and should not be further disassembled. If
the above steps fail to produce a working unit, the
module subassembly is faulty and should be
replaced.

Instruction Manual

Form 5739

February 2002

5–6

Instruction Manual

Form 5739
February 2002

Maintenance

Section 6 Maintenance6-6-

Section 6 describes the major components,
assembly, and disassembly of the Type 846 and
Model 3311 current-to-pressure transducers.

WARNING

Use only the procedures and new
parts specifically referenced in this
manual. Unauthorized procedures or
parts can affect product performance
and the output signal used to control
a process, and may render the
instrument dangerous.

Module Final Assembly

The active mechanical and electrical components of
the transducer are incorporated into a single,
field-replaceable module called the module final
assembly, as shown in figure 6-1. Electrical
connection between the terminal compartment and
module final assembly is made by electrical
feedthroughs that extend into the module
compartment. The feedthroughs enter sockets on
the electronic circuit board. The span and zero
screws extend through the terminal compartment
wall into the module compartment. Connection to the
span and zero potentiometers on the electronic
circuit board is made by VelcroR.

The module final assembly has three separate radial
ports. The upper port is for supply air, the middle
port for the output signal, and the lower ports for
exhaust. Three O-rings separate the ports. The two
lower O-rings are the same size, and the upper
O-ring is slightly smaller. Table 6-1 shows O-ring
sizes.

The module final assembly is attached to the module
cover, which allows insertion and removal, and can
be separated from the module cover for further
disassembly. A module cover O-ring provides a seal
between the module cover and module final
assembly. Table 6-1 shows the O-ring sizes. A slip
ring is located around the module feet. It allows the
module cover to turn easily when the module final
assembly is being removed from the housing.

Table 6-1. O-Ring Sizes

Description Qty. Size

Module O-rings 1

2
Pilot/Actuator O-rings 2 006
Circuit Board O-rings 2

1
Module Cover O-ring 1 238
T erminal Cover O-ring 1 238
Filter–Regulator O-ring 1 114

043
042

016
005

The module final assembly consists of three major
subassemblies, as shown in figure 6-1. They are the
electronic circuit board, pilot/actuator assembly, and
module subassembly.

Removing the Module Final Assembly

The module final assembly is attached to the module
cover. Removing the module cover automatically
removes the module final assembly from the
housing. When the module cover is unscrewed, the
electrical feedthroughs and span and zero
adjustments automatically disengage. The internal
air ports are also disengaged. The air supply to the
transducer should be turned off to prevent
uncontrolled air loss through the housing.

WARNING

Personal injury or property damage
could result from an uncontrolled
process. Unscrewing the module
cover removes power from the
electronics and the output signal will
be 0.0 psi. Before removing the
module cover, ensure the process is
properly controlled.

WARNING

Personal injury or property damage
could result from fire or an explosion.
In explosive atmospheres, remove
power and shut off the air supply to
the transducer before attempting to
remove the terminal compartment
cover or module cover. Failure to do
so could result in an electrical spark
or explosion.

Use the following steps to remove the module final
assembly from the housing and module cover:

1. Shut off the air supply. If applicable, remove the
cover lock and screw to allow access to the terminal

6–1

Type 846 and Model 3311

ELECTRONIC
CIRCUIT BOARD O-RINGS

TERMINAL COVER

MODULE
O-RINGS

ELECTRONIC CIRCUIT BOARD SCREWS

ELECTRONIC CIRUIT BOARD

SENSOR SEAL

MODULE SUBASSEMBLY

Instruction Manual

Form 5739

February 2002

PILOT/ACTUATOR
ASSEMBLY

KEY SLOT

STROKE PORT
SCREEN

RETAINING CLIP (2)

O-RING CLIP

MODULE HOUSING

V-GROOVE
ALIGNMENT
MARK

ALIGNMENT KEY

COVER SLOT (2)

PILOT/ACTUATOR
ASSEMBLY O-RINGS

MODULE FINAL ASSEMBLY

V-GROOVE

PILOT/ACTUATOR
ASSEMBLY SCREWS

MODULE FEET

SLIP RING

O-RING

MODULE COVER
INDICATING BOSS

6–2

MODULE COVER

C0790/IL

Figure 6-1. Type 846 and Model 3311 Exploded View

Instruction Manual

Form 5739
February 2002

MODULE
ALIGNMENT
KEY

INDICATING
BOSS

Maintenance

A6649/IL

Figure 6-2. Alignment Key Above Module Cover Indicating Boss

compartment cover. Unscrew the module cover.
When the module cover threads clear the housing,
slowly pull on the cover, and the module final
assembly will gradually come out of the housing.

Note

The module and the housing are
designed for minimal clearance;
therefore, patience may be required
while pulling on the cover. Time must
be allowed for release of the vacuum
effect between the housing and
module. If the module becomes tilted
and cannot be removed, reinsert it
completely into the housing and fully
engage the module cover threads.
Then proceed again with removal,
ensuring that you pull slowly in a
straight line.

Support both the module cover and the module final
assembly as it comes out of the housing. This is to
prevent dropping them, should they become
detached accidentally.

CAUTION

A6650/IL

Figure 6-3. Removing the Module Final Assembly from the

Module Cover

Grasp the module cover with one hand and the
module final assembly with the other hand. Rotate
the module final assembly so that the module
alignment key is directly above the indicating boss
on the module cover. Figure 6-2 shows the module
alignment key and the indicating boss. The module
feet are now aligned with the cover slots.

3. Remove the module final assembly from the
module cover. To accomplish this, hold the cover
steady, and push the module final assembly in the
direction of the module cover indicating boss. At the
same time, lift the opposite foot of the module final
assembly out of the cover slot, as shown in figure
6-3.

Replacing the Module Final Assembly

Use the following procedure to attach the module
cover and replace the module final assembly:

1. Ensure that the electronic circuit board and the
pilot actuator assembly provide the desired action
(direct or reverse). See the Electronic Circuit
Board and Pilot/actuator Assembly Action
descriptions later in this section.

2. Ensure that the slip ring is in place around the
feet of the module final assembly. The module cover
O-ring should be lightly lubricated with silicone
grease and placed in the O-ring gland. The stroke
port screen should be clean and in place.

Do not grip the module cover threads.
The threads are sharp and may cause
minor injury. Wear gloves when
removing the module cover.

2. Prepare to remove the module final assembly
from the module cover. Align the module feet with
the two interior cover slots. To accomplish this,
identify the indicating boss on the module cover,
shown in figure 6-2.

WARNING

Personal injury and property damage
could result from fire or explosion. Do
not operate the transducer with the
CENELEC flameproof options at a
supply pressure in excess of 1.4 bar
(20 psi). Doing so invalidates the

6–3

Type 846 and Model 3311

Instruction Manual

Form 5739

February 2002

key slot. Figure 6-1 shows the location of the
V-groove and the indicating mark.

8. Insert the module, engage the module cover
threads, and screw on the module cover. The
module final assembly will automatically engage the
electrical feedthroughs and span and zero screws.

9. Hand tighten the module cover as much as
possible. Use a wrench or long screwdriver shaft to
tighten the module cover an additional 1/4 to 1/2 turn
(24 to 27 NSm) (18 to 20 lbfSft). For units with
CENELEC Flameproof Certification, make sure the
cover lock and screw have been securely
re-installed. The screw accepts a 3 mm hex drive.

Note

A6651/IL

Figure 6-4. CENELEC Flameproof Module

CENELEC flameproof certification and
could allow flames to spread from the
unit potentially igniting and causing
an explosion (see figure 6-4).

Note

The module cover O-ring must be in
the O-ring gland, not down on the
threads of the cover. This will ensure
proper sealing of the pilot pressure
area.

3. Position the retaining clips in the module cover so
they are ready to accept the feet of the module final
assembly. Ensure the leaves on the retaining clips
are facing up. Figure 6-1 shows the correct
orientation.

4. Insert one of the module feet into a cover slot,
and push on the module final assembly to compress
the retaining clip. Insert the opposite foot into the
opposite cover slot, and rotate the module 90
degrees in the module cover to secure it in place.

5. Ensure that the three module O-rings are in the
O-ring glands and are lightly lubricated with silicone
grease. Inspect the O-rings to ensure that they are
not twisted or stretched.

6. Apply lubricant to module cover threads for ease
of assembly.

7. Prepare to insert the module into the housing.
Align the V-groove located on the module final
assembly with the indicating mark located on the
nameplate. This positions the alignment key with the

When the module cover is tightened,
connection is made with the electrical
feedthroughs and span and zero
screws, and the module final
assembly O-rings become seated.
Failure to fully tighten the module
cover may prevent the transducer
from operating properly.

Electronic Circuit Board

The electronic circuit board is located on top of the
module final assembly, as shown in figure 6-1.
Beneath the circuit board and permanently attached
to it is the pressure sensor. Two jumpers on the
circuit board control various functions of the
transducer. Figure 6-5 shows the location of these
jumpers.

Optional Remote Pressure Reading
(RPR) Jumper

Remote Pressure Reading (RPR) is an optional
diagnostic feature that enables the operator to
determine the transducer output signal from any
location along the signal wire path. The transducer
generates a frequency signal that can be received
by a HART Communicator or a frequency counter.
Operation of the RPR feature is jumper-selectable,
in units so equipped. The RPR feature operates
when the jumper is located in the N position on the
circuit board. With the jumper in the D position, the
RPR feature does not operate. When the RPR
feature is included, the transducer is shipped with
the RPR jumper in the N position, unless otherwise
specified. For more information about the RPR
feature, refer to Remote Pressure Reading (RPR)
in Section 5.

6–4

Instruction Manual

Form 5739
February 2002

RPR OFF

HIGH
RANGE

1

Maintenance

For reverse action units, output changes inversely
with a change in input. For example, as the input
increases from 4 to 20 mA the output decreases
from 1.0 to 0.2 bar (15 to 3 psi). Reverse action
circuit boards are red in color.

Upon loss of input current, or if input current
decreases below 3.3 0.3 mA, the output of the
direct action unit decreases to less than 0.1 bar (1
psi). In the same situation, the output of the reverse
action unit increases to near supply pressure.

LOW
RANGE

NOTE:

1

RPR JUMPER ONLY ON UNITS WITH REMOTE
PRESSURE READING (RPR) OPTION

A6652/IL

Figure 6-5. Circuit Board Jumper Positions

RPR ON

Note

When operating Type 846 and Model
3311 transducers in series, only one
unit may be configured for Remote
Pressure Reading. Activating the RPR
feature in two units will result in an
unusable RPR signal.

Range Jumper

Removing the Electronic Circuit Board

The electronic circuit board is connected to the
module final assembly by five mounting screws. The
circuit board must be removed to inspect the
pressure sensor located beneath it. To remove the
circuit board, remove the five mounting screws and
pull upward on the plastic board standoff

1

(black=multirange; white=standard).

CAUTION

Standard electronic assembly
handling procedures apply. Do not
attempt to remove the circuit board by
pulling on the components. Doing so
could weaken the connections and
disable the electronics.

Be careful when handling the pressure sensor
located beneath the circuit board. The pressure
sensor lead frame is bent to allow the pressure
sensor to fit properly in the sensor cavity of the
module final assembly, and to maintain flush contact
with the pressure sensor manifold.

The range jumper is positioned according to the
calibration specified. All full span calibrations and
some split range calibrations can be accomplished
with the range jumper in the High Range position.
Some split range calibrations require the jumper to
be in the Low Range position. For more information
about the range jumper, refer to Standard
Performance: Split Range Input, Direct Action in
Section 4.

Action

For direct action units, output changes directly with a
corresponding change in input. For example, as the
input increases from 4 to 20 mA the output
increases from 0.2 to 1.0 bar (3 to 15 psi). Direct
action circuit boards are green in color.

Three O-rings accompany the pressure sensor. Two
O-rings of the same size are located on each side of
the pressure sensor. A third, smaller O-ring is
positioned in the beveled O-ring gland of the module
sub-assembly. Table 6-1 shows the O-ring sizes.
The pressure sensor may be gently bent away from
the pressure sensor manifold to access the sensor
O-ring and confirm that the pressure ports are clear.

Product Change

Previous electronic circuit boards have the two
sensor O-rings positioned on the shoulders of the
sensor. They also have a sensor seal washer that is
positioned in the bottom of the pressure sensor
cavity of the module subassembly. Both the
previous and the current designs are compatible

6–5

Type 846 and Model 3311

Instruction Manual

Form 5739

February 2002

CORRECT POSITION

INCORRECT POSITION

A6653/IL

Figure 6-6. Positioning the Pressure Sensor

MANIFOLD

SOLID STATE
PRESSURE SENSOR

MANIFOLD

ELECTRONIC
CIRCUIT
BOARD

ELECTRONIC
CIRCUIT
BOARD

with the cavity in the module subassembly. The
current design does not require the sensor seal
washer; therefore, the sensor seal washer may be
discarded when switching from the previous design
electronic circuit board to the current design.

Replacing the Electronic Circuit Board

1. Verify that the circuit board is green for assembly
into a direct action unit, or red for assembly into a
reverse action unit.

2. Ensure that the three O-rings are in the proper
position. The small O-ring is positioned in the
beveled O-ring gland of the module subassembly.
The two sensor O-rings are each positioned on the
shoulders of the sensor. They should be lightly
lubricated with silicone grease.

3. Ensure that the pressure sensor is correctly
positioned against the manifold. The pressure
sensor should be centered and in contact with the
manifold, as shown in figure 6-6.

4. Position the circuit board on the module
subassembly. Ensure that the circuit board mounting
holes match those on the module subassembly.
Place the three long screws in the mounting holes
adjacent to the pressure sensor.

5. Place the two short screws in the remaining
mounting holes. Tighten the three long screws first,
then tighten the remaining two screws.

Pilot/Actuator Assembly

The pilot/actuator assembly is located at the bottom
of the module final assembly, as shown in figure 6-1.
It is a unitized assembly consisting of the coil,
magnet, and spring of the actuator, and the deflector
and nozzles of the pilot stage. Two O-rings are part
of the pilot/actuator assembly. Table 6-1 shows the
O-ring sizes. They are located in the beveled O-ring

ALIGNMENT
KEY

RUBBER
DIAPHRAGM

MOUNTING
SCREWS

A6654/IL

Figure 6-7. Pilot/Actuator Assembly (Bottom View)

glands of the module subassembly, adjacent to the
nozzles. The pilot/actuator assembly is held in place
by four mounting screws.

Action

A blue rubber diaphragm under the deflector bar and
nozzle area identifies the direct action pilot/actuator
assembly. A red diaphragm under the nozzle area
identifies the reverse action pilot/actuator assembly.
Figure 6-7 shows the bottom view of the
pilot/actuator assembly.

Removing the Pilot/Actuator Assembly

To remove the pilot/actuator assembly, disengage
the four mounting screws, and gently pull the
assembly out of the module subassembly. To aid
removal, the pilot/actuator framework may be gently
gripped with a pair of pliers.

WARNING

Personal injury or property damage
could result from an uncontrolled
process. Do not attempt to remove the
pilot/actuator assembly by gripping or
pulling on the deflector or nozzles.
Doing so could alter the alignment or
disable the deflector/nozzle
mechanism.

Inspect the assembly for a buildup of foreign
material. The nozzle passageways should be clear,
and the deflector should be clean. The deflector can
be cleaned by spraying it with-contact cleaner.
Clean the nozzles by gently inserting a wire with a
maximum diameter of 0.38 mm (0.015 inches).

6–6

Instruction Manual

Form 5739
February 2002

Maintenance

WIRE

A6655-1/IL

Figure 6-8. Cleaning the Nozzles

D Insert the wire into each nozzle separately

from the outside as shown in figure 6-8.

D Do not try to put the wire through both nozzles

simultaneously.

D Do not push the wire on the deflector bar.

CAUTION

Do not apply force to the deflector bar
while cleaning the nozzles. Doing so
could alter the alignment or disable
the deflector mechanism.

DEFLECTOR BAR

WIRE

PLASTIC HOUSING

4. Prepare to insert the assembly by aligning the
key on the pilot/actuator assembly with the key slot
in the module subassembly.

5. Insert the assembly into the module
subassembly, and engage the four mounting
screws.

Module Subassembly

The module subassembly, shown in figure 6-1,
consists of the module final assembly with both the
electronic circuit board and pilot/actuator assembly
removed. The module subassembly contains the
porting and valving for the booster stage.

Note

CAUTION

Do not use chlorinated solvents for
cleaning the pilot/actuator assembly.
The chlorinated solvents will
deteriorate the rubber diaphragm

Replacing the Pilot/Actuator Assembly

1. Verify that the rubber diaphragm under the
nozzle area is blue for pilot/actuators inserted into a
direct action unit, or red for pilot/actuators inserted
into a reverse action unit.

2. Inspect the pilot/actuator assembly cavity in the
module final assembly to ensure that it is clean.

3. Lightly lubricate the two O-rings with silicone
grease, and place them in the beveled O-ring
glands. O-rings between the pilot/actuator assembly
and the module should be installed justified to the
lower portion of the O-ring gland. When properly
positioned, the air passageway should be visible
through the O-ring inside diameter.

The module subassembly is aligned at
the factory and should not be further
disassembled. Disassembling the
module subassembly may result in
performance outside specifications.

Terminal Compartment

The terminal compartment contains the terminal
block, terminal block connection board, span and
zero screws, electrical feedthroughs, and internal
grounding lug, as shown in figure 6-9. The terminal
block connection board is attached to the terminal
block and to the electrical feedthroughs.

Separate test points are provided that have a
10-ohm resistor in series with the signal negative (–)
terminal. The test points allow the input current to be
determined with a voltmeter without disconnecting a
signal lead. A 4 to 20 mA span produces a 40 to 200
mV dc voltage drop across the 10-ohm resistor. The
test points can accommodate different connections,
including alligator clips and E–Z hooks.

6–7

Type 846 and Model 3311

Instruction Manual

Form 5739

February 2002

TEST PINS

ZERO AND SPAN
SCREWS

GROUNDING
LUG

TERMINAL BLOCK
CONNECTION
BOARD

TERMINAL
BLOCK

ELECTRICAL
FEEDTHROUGHS

Exhaust and Stroke Port Screens

Two identical screens, the exhaust port screen and
the stroke port screen, allow air to vent to the
outside environment. The exhaust port screen is
located behind the nameplate. Removing the two
nameplate screws and rotating the nameplate to the
side allows access to the exhaust port screen.
Figure 7-1 shows an exploded parts view.

The stroke port screen is located at the center of the
module cover. Removing the module final assembly
from the housing and then from the module cover
allows access to the stroke port screen. Removing
the Module Final Assembly earlier in this section
describes this procedure. Figure 7-1 shows an
exploded parts view.

A6656/IL

Figure 6-9. Terminal Compartment Exploded View

The terminal block and terminal block connection
board can be removed by disengaging the two
terminal block mounting screws. Lubricate the
terminal compartment cover threads with
anti-seizing paste or a low temperature lubricant.
See table 6-1 for the size of the terminal
compartment cover O-ring.

6–8

Instruction Manual

Form 5739
February 2002

Parts List

Section 7 Parts List7-

Whenever corresponding with the Fisher sales office
or sales representative about this equipment, always
mention the transducer serial number. When
ordering replacement parts, refer to the 11-character

Table 7-1. Parts List Cross Reference

Key No. Description Rosemount Part No. Fisher Part No. Spares Category

Module Final Assembly

Standard Performance

Direct Action 4–20 mA
Direct Action 10–50 mA
Reverse Action 4–20 mA
CENELEC Flameproof

Direct Action 4–20 mA
Direct Action 10–50 mA
Reverse Action 4–20 mA

Multirange Performance

Direct Action 4–20 mA
Direct Action 10–50 mA
Reverse Action 4–20 mA

Module Subassembly

9

Standard Performance (Direct or Reverse Action)

CENELEC Flameproof (Direct or Reverse Action)

(4)

(1)(4)

Fisher part number of each required part. Figure 7-1
shows the key numbers for all replaceable parts.

03311-0298-0004
03311-0298-0010
03311-0298-0005

03311-0298-0006
03311-0298-0011
03311-0298-0007

03311-0298-0008
03311-0298-0012
03311-0298-0009

03311-0409-0002
03311-0409-0003

13B8788 X012
14B5026 X013
13B8789 X012

18B4646 X012
18B5800 X012
18B6514 X012

13B8790 X012
18B5801 X012
13B8791 X012

13B8792 X012
18B5802 X012

B
B
B

B
B
B

B
B
B

B
B

(6)

Pilot/Actuator Assembly

12

8

3

15

1 T erminal Compartment Cover 03311-0413-0001 18B5809 X012 C
5 Terminal Block Kit

16 Screens (12/pkg) 03311-0415-0001 13B8802 X012 B

10

11

7

2, 21, & 23

13

6

14
18 Retaining Clips (3/kit)
22 Module Cap (5/pkg)

Standard Performance Only

Direct Action
Reverse Action

Circuit Board Assembly

Standard Performance Only

Direct Action
Reverse Action
Direct Action 10–50 mA

(2)

Housing

Standard
CENELEC Flameproof

Module Cover

Single Stroke Port
Multiple Ports
Threaded Stroke Port

O–Rings

Module (5/kit)
Pilot/Actuator (5/kit)
Circuit Board (5/kit)
Cover [12 O–rings, 12 slip rings]
Filter-Regulator (10/kit)

Screws

Pilot/Actuator (3/kit)
Circuit Board (3/kit)
Nameplate (3/kit)

(1)

03311-0410-0001

(1)

(3)

(5)

(5)

(5)

(5)

(5)(8)

(5)

(5)

(5)

(5)

(5)

03311-0410-0002

03311-0411-0005
03311-0411-0006
03311-0411-0007

03311-0412-0003
03311-0412-0004

03311-0341-0001
03311-0341-0002
03311-0434-0001

03311-0414-0002 13B8801 X012 B

03311-0416-0001
03311-0417-0001
03311-0418-0004
03311-0421-0001

03311-0428-0001

03311-0417-0002
03311-0418-0001
03311-0419-0001

03311-0420-0001 13B8810 X012 C
03311-0424-0001 18B5810 X012 B

(continued)

13B8793 X012
13B8794 X012

13B8795 X012
13B8796 X012
18B5803 X012

18B5804 X022
18B5805 X022

18B5806 X012
18B5807 X012
18B5808 X012

13B8803 X012
13B8804 X012
13B8805 X012
13B8806 X012

18B5815 X022

13B8807 X012
13B8808 X012
13B8809 X012

B
B

B
B
B

C
C

C
C

B
B
B
B

B

C
C
C

7–1

Type 846 and Model 3311

Instruction Manual

Form 5739

February 2002

B2467/IL

Figure 7-1. Exploded Parts Drawing

7–2

Instruction Manual

Form 5739
February 2002

Parts List

B2468 / IL

Figure 7-1. Exploded Parts Drawing (continued)

7–3

Type 846 and Model 3311

Table 7-1. Parts List Cross Reference (continued)

Gauges

0–60 psi/bar/kPa (supply)
0–30 psi/bar/kPa (output)
0–60 psi/bar/kPa (supply)
0–30 psi/bar/kPa (output)
0–60 psi/kg/cm2 (supply)
0–30 psi/kg/cm2 (output)
0–60 psi/bar/kPa (output)
SST 0–60 psi/kg/cm2 (supply)
SST 0–60 psi/bar/kPa (supply)
SST 0–60 psi/bar/kPa (output)
SST 0–60 psi/bar/kPa (output)
SST 0–60 psi/bar/kPa (supply)

Filter-Regulator Direct Mounting Kit

F2 SST Bolts 20 Yr 03311-0422-0002 18B581 1 X022 B

Filter-Regulator with Direct Mounting Kit

SST Bolts 62 Yr 03311-0425-0002 18B5813 X022 B

Universal Mounting Bracket

Epoxy Painted Carbon Steel, Carbon Steel

Nuts/Bolts

Epoxy Painted Carbon steel, SST Nuts/Bolts
316 SST, SST Nuts/Bolts for use with SST Housing
316 SST, SST Nuts/Bolts for use with Aluminum

Housing

1. Includes O–rings.

2. Includes housing, span and zero screws, electrical feedthroughs, and grounding lug.

3. Includes terminal block, connection board, and screws.

4. For units with approvals other than CENELEC Flameproof, use standard module.

5. #/kit indicates number of tranducers that may be serviced.

6. Spares Catetories
Category A – Recommend 1 spare part per 25 transducers
Category B – Recommend 1 spare part per 50 transducers
Category C – None normally required.

(7)

(9)

(7)

(9)

03311-0258-0001
03311–0258–0002
03311–0258–0003
03311–0258–0004
03311–0258–0007
03311–0258–0008
03311–0258–0009

03311–0258–0010
03311–0258–0011
03311–0258–0013
03311–0258–0012

03311-0404-0001

03311-0404-0002

03311-0404-0003

03311-0404-0004

Instruction Manual

Form 5739

February 2002

19B3088X012
19B3086X012
19B3088X012
19B3086X012
19B3090X012
19B3087X012
19B3089X012
19B3109X012
19B3091X012
19B3092X012
19B3092X012
19B3091X012

18B5816 X012
18B5817 X012

14B4979 X012
14B4977 X012

7. Filter-Regulator Direct Mounting Kit includes O-ring.

8. Contains O-rings for both housing styles.

9. Extra O-ring and spacer included for both housing
styles.

B
B
B
B
B
B
B
B
B
B
B
B

C
C

C
C

7–4

Instruction Manual

Form 5739
February 2002

Loop Schematics

Section 8 Loop Schematics

This section includes loop schematics required for wiring of intrinsically safe installations. If you have any
questions, contact your Fisher Controls sales representative or sales office.

CSA Schematics

13B8779-C/ doc

8–1

Type 846 and Model 3311

FM Schematics

Instruction Manual

Form 5739

February 2002

13B8780-C/ doc

8–2

Instruction Manual

Form 5354
February 2002

Index

Index

B

Booster Stage, 4-2

C

Calibration, 3-1

Connections

Electrical, 2-7
Output Pressure, 2-5
Supply Pressure, 2-1

D

Deflector/Nozzle Pilot, 4-1

Detail View, 6-2

Diagnostic Features, 5-1

Remote Pressure Reading (RPR), 5-1
Stroke Port, 5-1

I

Installation, 2-1

L

Loop Schematics

CSA, 8-1
FM, 8-2

M

Magnetic Actuator, 4-1

Maintenance, 6-1

Model Number Table, 1-7

Module Final Assembly, 6-1

Removing, 6-1
Replacing, 6-3
Transporting, 3-5

Module Subassembly, 6-7

Mounting, 2-1

Multirange Performance, Full Range

Direct Action, 3-2
Reverse Action, 3-3

E

Electrical Connections, 2-7

Electronic Circuit, 4-1

Electronic Circuit Board, 6-4

Removing, 6-5
Replacing, 6-6

Exhaust and Stroke Port Screens, 6-8

Exhaust Port, 2-8

F

Failure Mode, 2-8

H

HART Communicator, 5-1

Operating Off-line, 5-1
Wiring Connections, 5-1

O

O-ring Sizes, 6-1

Output Gauge Port, 2-5

Output Pressure Connection, 2-5

P

Pilot Stage, 4-1

Pilot/Actuator Assembly, 6-6

Removing, 6-6
Replacing, 6-7

Pressure Sensor, 6-5

Principle of Operation

Booster Stage, 4-2
Electronic Circuit, 4-1
Magnetic Actuator, 4-1
Pilot Stage, 4-1

Product Change, 6-5

I–1

Type 846 and Model 3311

Instruction Manual

Form 5354
February 2002

Product Description, 1-2

R

Range Jumper, 6-5

Remote Pressure Reading (RPR) Jumper, 6-4

S

Specifications, 1-2

Standard Performance

10 to 50 mA Input, 3-5
12 to 20 mA Input, 3-3
4 to 12 mA Input, 3-3

Full Range

Direct Action, 3-1
Reverse Action, 3-3

Split Range

Direct Action, 3-3
Reverse Action, 3-4

Stroke Port, 2-7

Supply Pressure Connection, 2-1

T

Terminal Compartment, 6-7

Troubleshooting

In the Shop, 5-5
In-service, 5-3

I–2

Type 846 and Model 3311

Instruction Manual

Form 5354
February 2002

These products may be covered by one or more of the following patents (4,481,967;
4,534,376; 4,638,830; 4,653,523; 4,665,938; 4,760,859; 4,777,826; 4,901,756) or
under pending patent applications.

Fisher-Rosemount satisfies all obligations coming from legislation
to harmonize product requirements in the European Union.

Fisher and Fisher-Rosemont are marks owned by Fisher Controls International, Inc. or Fisher-Rosemont Systems Inc., businesses of Emerson Process Management. The Emerson logo
is a trademark and service mark of Emerson Electric Co. HART is a mark owned by the HART Communications Foundation.
All other marks are the property of their respective owners.

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. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

Emerson Process Management

Fisher

Marshalltown, Iowa 50158 USA
Cernay 68700 France
Sao Paulo 05424 Brazil
Singapore 128461

www.Fisher.com

EFisher Controls International, Inc. 2002; All Rights Reserved

I–2