Emerson Fisher 846 Instruction Manual

Instruction Manual

D102005X012

846 Transducer

Fisherr 846 Current-to-Pressure Transducer

March 2015

Contents

1. Introduction

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

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

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

Related Documents 5..........................

Educational Services 6.........................

2. Installation
Hazardous Area Classifications and Special

Instructions for Safe‐Use and Installation

in Hazardous Locations 7.....................

CSA 8....................................

FM 8.....................................

ATEX 9...................................

IECEx 10..................................

ATEX/IECEx 10............................

Mounting 11.................................

Pressure Connections 11.......................

Supply Pressure 13.........................

Output Pressure 17........................

Electrical Connections 17.......................

Venting Ports 18..............................

Signal Interruption 18..........................

3. Calibration
Standard Performance:

Full Range Input, Direct Action 21.............

Multirange Performance:

Full Range Input, Direct Action 21.............

Standard Performance:

Split Range Input, Direct Action 22.............

4 to 12 mA Input Signal 22..................

12 to 20 mA Input Signal 22.................

Standard Performance:

Full Range Input, Reverse Action 23............

Multirange Performance:

Full Range Input, Reverse Action 23............

Standard Performance:

Split Range Input, Reverse Action 24...........

4 to 12 mA Input Signal 24..................

12 to 20 mA Input Signal 24.................

Transporting the Module Final Assembly 25.......

4. Principle of Operation

Electronic Circuit 26...........................

Magnetic Actuator 27..........................

Pilot Stage 27.................................

Booster Stage 28..............................

Figure 1-1. Fisher 846 Current‐to‐Pressure
Transducer

X0234

5. Troubleshooting

Diagnostic Features 29.........................

Stroke Port 29.............................

Remote Pressure Reading (RPR) 29...........

Using a Frequency Counter to read the

RPR Signal 29.........................

In‐service Troubleshooting 30...................

Troubleshooting in the Shop 33.................

6. Maintenance

Module Final Assembly 35......................

Removing the Module Final Assembly 38......

Replacing the Module Final Assembly 39.......

Electronic Circuit Board 40......................

Remote Pressure Reading (RPR) Jumper 40.....

Range Jumper 41..........................

Action 41.................................

Removing the Electronic Circuit Board 41......

Replacing the Electronic Circuit Board 42......

Pilot/Actuator Assembly 42.....................

Action 42.................................

Removing the Pilot/Actuator Assembly 43.....

Replacing the Pilot/Actuator Assembly 44.....

Module Subassembly 44........................

Terminal Compartment 44.....................

Exhaust and Stroke Port Screens 45..............

7. Parts 46....................................

8. Installation Drawings 50......................

www.Fisher.com

846 Transducer

March 2015

Instruction Manual

D102005X012

Section 1 Introduction

Scope of Manual

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

Do not install, operate or maintain an 846 current‐to‐pressure transducer without being fully trained and qualified
in valve, actuator, and accessory installation, operation, and maintenance. To avoid personal injury or property

damage, it is important to carefully read, understand, and follow all of the contents of this manual, including
all safety cautions and warnings. If you have any questions about these instructions, contact your Emerson Process

Management sales office before proceeding.

Description

The 846 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. Refer to the Calibration section 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 846 may also be used to transduce a signal
for a pneumatic receiving instrument.

The 846 is an electronic I/P transducer. It has 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 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 846 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.

Specifications

WARNING

This product is intended for a specific range of pressures, temperatures, and other application specifications. Applying
different pressure, temperature and other service conditions could result in a malfunction of the product, property damage
or personal injury.

Specifications for the 846 transducer are listed in table 1-1.

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Table 1-1. Specifications

846 Transducer

March 2015

Input Signal

Standard Performance:

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

Multirange Performance:

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

Equivalent Circuit

See figure 1-3

Output Signal

(1)

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

(2)

Standard Performance: 1.2 to 1.6 bar (18 to 24 psi)
Multirange Performance:

0.2 bar (3 psi)

(3)

greater than the maximum

calibrated output pressure
Maximum: 2.4 bar (35 psi)

Supply Pressure Medium

Clean, dry air

Per ISA Standard 7.0.01

A maximum 40 micrometer particle size in the air
system is acceptable. Further filtration down to 5
micrometer particle size is recommended. Lubricant

-Continued-

content is not to exceed 1 ppm weight (w/w) or
volume (v/v) basis. Condensation in the air supply
should be minimized

Per ISO 8573-1

Maximum particle density size: Class 7
Oil content: Class 3
Pressure Dew Point: Class 3 or at least 10°C less than

the lowest ambient temperature expected

Output Air Capacity

(4)

Standard: 6.4 m3/hr (240 scfh) at 1.4 bar
(20 psi) supply pressure

3

Multirange: 9.7 m

/hr (360 scfh) at 2.5 bar

(35 psig) supply pressure

Maximum Steady‐State Air Consumption

(4)

0.3 m3/hr (12 scfh) at 1.4 bar (20 psi) supply pressure

Temperature Limits

(2)

Operating: -40 to 85_C (-40 to 185_F)
Storage :-40 to 93_C (-40 to 200_F)

Humidity Limits

0 to 100% condensing relative humidity

Performance

(5)

Note: The performance of all 846 I/Ps is verified
using computer automated manufacturing systems
to ensure that every unit shipped meets its
performance specifications.

Linearity, Hysteresis, and Repeatability: $0.3% of
span.

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, 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

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846 Transducer

March 2015

Table 1-1. Specifications (continued)

Instruction Manual

D102005X012

Performance (continued)

(5)

Electromagnetic Interference (EMI): Tested per IEC
61326‐1 (Edition 1.1). Meets emission levels for Class
A equipment (industrial locations) and Class B
equipment (domestic locations). Meets immunity
requirements for industrial locations (Table A.1 in the
IEC specification document). Immunity performance
is shown in table 1-2.

Leak Sensitivity

3

4.8 m

/hr (180 scfh) downstream leakage.

(4)

: Less than 1.0% of span for up to

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 internal connection
Electrical: 1/2‐14 NPT internal 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: 0 to 10,000 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)

-continued-

Electrical Classification

Hazardous area:

CSA C/US—Intrinsically Safe, Explosion-proof,

Non-Incendive

FM—Intrinsically Safe, Explosion-proof, Non-Incendive

ATEX—Intrinsically Safe, Flameproof, Type n

IECEx—Intrinsically Safe, Flameproof

Refer to Hazardous Area Classifications and Special
Instructions for “Safe Use” and Installation in
Hazardous Locations in Section 2 for additional
information

Electrical Housing:

Tropicalization (Fungus test per MIL-STD-810)

CSA C/US—Type 4X

FM—Type 4X

ATEX—IP66

IECEx—IP66

(6)

(6)

Other Classifications/Certifications

INMETRO—National Institute of Metrology, Quality,
and Technology (Brazil)

KGS—Korea Gas Safety Corporation (South Korea)

NEPSI— National Supervision and Inspection Centre

for Explosion Protection and Safety of
Instrumentation (China)

Contact your Emerson Process Management sales

office for classification/certification specific

information

Construction Materials

Housing: Low‐copper aluminum with polyurethane
paint, or 316 stainless steel
O‐Rings: Nitrile, except silicone for sensor O‐rings.

Options

Fisher 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
Stainless Steel: 6.7 kg (14.8 lb) excluding options

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Table 1-1. Specifications (continued)

846 Transducer

March 2015

Declaration of SEP

Fisher Controls International LLC declares this
product to be in compliance with Article 3 paragraph
3 of the Pressure Equipment Directive (PED) 97 / 23 /
EC. It was designed and manufactured in accordance

NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 - Process Instrument Terminology.

1. Metric calibration also available.

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

3. 0.14 bar (2 psi) for a 2.3 bar (33 psi) output.

4. Normal m

5. 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.

6. ATEX and IECEx Flameproof — IP66 per CSA Letter of Attestation.

3

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

with Sound Engineering Practice (SEP) and cannot
bear the CE marking related to PED compliance.

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

Table 1-2. EMC Immunity Performance Criteria

Port Phenomenon Basic Standard Test Level Performance Criteria

Electrostatic discharge (ESD) IEC 61000‐4‐2

Enclosure

I/O signal/control

Specification limit = ±1% of span

1. A = No degradation during testing. B = Temporary degradation during testing, but is self‐recovering.

Radiated EM field IEC 61000‐4‐3

Burst (fast transients) IEC 61000‐4‐4 1 kV A
Surge IEC 61000‐4‐5 1 kV (line to ground only, each) B

Conducted RF IEC 61000‐4‐6

4 kV contact
8 kV air

80 to 1000 MHz @ 10V/m with 1 kHz AM at 80%
1400 to 2000 MHz @ 3V/m with 1kHz AM at 80%
2000 to 2700 MHz @ 1V/m with 1kHz AM at 80%

150 kHz to 8 MHz at 3 Vrms B
8 MHz to 80 MHz at 3 Vrms A

(1)

A

A

Related Documents

This section lists other documents containing information related to the 846 transducer. These documents include:

D INMETRO Hazardous Area Approvals for Fisher 846 Current-to-Pressure Transducers Instruction Manual

(D103623X012)

D NEPSI Hazardous Area Approvals for Fisher 846 Current-to-Pressure Transducers Instruction Manual

(D103618X012)

All documents are available from your Emerson Process Management sales office. Also visit our website at
www.Fisher.com.

5

846 Transducer

March 2015

Instruction Manual

D102005X012

Figure 1-2. Transducer Modular Construction

TERMINAL
COMPARTMENT
COVER

TERMINAL BLOCK

MODULE HOUSING

ELECTRONIC
CIRCUIT BOARD

MODULE FINAL
ASSEMBLY

Figure 1-3. Equivalent Circuit

846

6 V DC

50
OHM
S

POWER
SUPPLY

NOTE:
THE 846 IS NOT A CONSTANT RESISTOR IN SERIES WITH AN INDUCTOR. IT IS BETTER
MODELED IN THE LOOP AS A 50 OHM RESISTOR IN SERIES WITH A 6‐VOLT DC VOLTAGE
DROP WITH NEGLIGIBLE INDUCTANCE.

A6325

MODULE COVER

A6643

Educational Services

For information on available courses for the 846 current‐to‐pressure transducer, as well as a variety of other products,
contact:

Emerson Process Management
Educational Services - Registration
Phone: [phone] or [phone]
Email: [e-mail]
http://www.emersonprocess.com/education

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Instruction Manual

D102005X012

846 Transducer

March 2015

Section 2 Installation22

WARNING

To avoid personal injury or property damage from the sudden release of pressure or air:

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

D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the

actuator cannot suddenly open or close the valve.

D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure

on both sides of the valve.

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

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

media.

This section presents information on installing the 846 current‐to‐pressure transducer. Figures 2-1, 2-2, 2-3, and 2-5
can be used as references for instructions contained in this section.

When a control valve is ordered with a 846 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 51 mm (2‐inch) 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.

Hazardous Area Classifications and Special Instructions for “Safe Use” and
Installation in Hazardous Locations

Certain nameplates may carry more than one approval, and each approval may have unique installation/wiring
requirements and/or conditions of “safe use”. These special instructions for “safe use” are in addition to, and may
override, the standard installation procedures. Special instructions are listed by approval.

Note

This information supplements the nameplate markings affixed to the product.

Always refer to the nameplate itself to identify the appropriate certification. Contact your Emerson Process Management sales

office for approval/certification information not listed here.

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846 Transducer

March 2015

Instruction Manual

D102005X012

WARNING

Failure to follow these conditions of safe‐use could result in personal injury or property damage from fire or explosion, and
area re‐classification.

CSA

Intrinsically Safe, Explosion-proof, Non-Incendive

No special conditions for safe use.

Refer to table 2-1 for approval information.

Table 2-1. Hazardous Area Classifications for Canada—cCSAus

Certification Body Certification Obtained Entity Rating Temperature Code

Vmax = 30 VDC
Imax = 100 mA
Ci = 0.016 mF
Li = 20 mH

- - - T4 (Tamb ≤ 60_C)

T4 (Tamb ≤ 60_C)

CSA

Ex ia Intrinsically Safe
 Class I Division 1 Groups A,B,C,D T4
 per drawing GE59146 (see figure 8-1)

XP Explosion-proof
 Class I Division 1 Groups C,D
DIP Dust Ignition-proof
 Class II III Division I Groups E,F,G T4
NI Non-incendive
 Class I, Division 2, Groups A,B,C,D T4

FM

Special Conditions of Use

Intrinsically Safe, Explosion-proof, Non-Incendive

1. The apparatus enclosure contains aluminum and is considered to constitute a potential risk of ignition by impact or
friction. Care must be taken into account during installation and use to prevent impact or friction.

Refer to table 2-2 for additional approval information.

Table 2-2. Hazardous Area Classification for United Stated—FM

Certification Body Certification Obtained Entity Rating Temperature Code

Vmax = 30 VDC
Imax = 100 mA
Pmax = 1.0 W
Ci = 0.016 mF
Li = 20 mH

- - - T4 (Tamb ≤ 60_C)

T4 (Tamb ≤ 60_C)

FM

IS Intrinsically Safe
 Class I, II, III Division 1 Groups A,B,C,D,E,F,G
 per drawing GE59147 (see figure 8-2)

XP Explosion-proof
 Class I Division 1 Groups B,C,D
DIP Dust Ignition-proof
 Class II, III Division I Groups EFG
NI Non-incendive
 Class I Division 2 Groups A,B,C,D

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ATEX

Special Conditions for Safe Use

Intrinsically Safe

This equipment is intrinsically safe and can be used in potentially explosive atmospheres.

The apparatus must be only connected to a certified associated intrinsically safe equipment and this combination
must be compatible as regards intrinsic safety rules.

The electrical parameters of certified equipment which can be connected to the sensor must not exceed one of these
following values:

U

≤ 30 V

0

I

≤ 100 mA

0

P

≤ 1.0 W

0

Ambient temperature: -40_C to +80_C

Flameproof

Refer to page 10.

Type n

No special conditions for safe use.

Refer to table 2-3 for additional approval information.

Table 2-3. Hazardous Area Classifications—ATEX

Certificate Certification Obtained Entity Rating Temperature Code

Intrinsically Safe
II 1 GD
Gas
Ex ia IIC T4,T5 Ga
Dust
Ex ia IIIC IP66 Da T90_C (Tamb ≤ 80_C)
Ex ia IIIC IP66 Da T50_C (Tamb ≤ 40_C)

Flameproof

ATEX

II 2 G
Gas
Ex d IIB T5/T6 Gb

Type n
II 3 GD
Gas
Ex nA IIC T5/T6 Gc
Dust
Ex tc IIIC T88_C T
Ex tc IIIC T77_C T

500
500

Dc IP66
Dc IP66

Ui = 30 VDC
Ii = 100 mA
Pi = 1.0 W
Ci = 8 nF
Li = 20 mH

- - -

- - -

T4 (Tamb ≤ 80_C)
T5 (Tamb ≤ 40_C)

T5 (Tamb ≤ 80_C)
T6 (Tamb ≤ 65_C)

T5 (Tamb ≤ 85_C)
T6 (Tamb ≤ 74_C)

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846 Transducer

March 2015

IECEx

Special Conditions for Safe Use

Intrinsically Safe

No special conditions for safe use.

Flameproof

See below.

Refer to table 2-4 for additional approval information.

Table 2-4. Hazardous Area Classifications—IECEx

Certificate Certification Obtained Entity Rating Temperature Code

Intrinsically Safe
Gas
Ex ia IIC T4/T5 Ga

IECEx

Flameproof
Gas
Ex d IIB T5/T6 Gb

Ui = 40 VDC
Ii = 200 mA
Pi = 1.0 W
Ci = 8 nF
Li = 20 mH

- - -

Instruction Manual

D102005X012

T4 (Tamb ≤ 80_C)
T5 (Tamb ≤ 40_C)

T5 (Tamb ≤ 80_C)
T6 (Tamb ≤ 65_C)

ATEX/IECEx

Special Conditions for Safe Use

Flameproof

1. The equipment incorporates flameproof joints which have a maximum gap less than that stated in EN 60079‐1. The
user shall refer to the manufacturer's installation, operation, and maintenance document for guidance.

2. The cable entry device used shall be certified Ex d IIB or Ex d IIC.

3. The user shall ensure that the maximum system pressure does not exceed 35 psi.

4. Refer to figures 2-2 and 2-3 for proper bolting engagement length for ATEX and IECEx flameproof units.

5. A cable entry hole is provided for the accommodation of a flameproof cable entry device, with or without the
interposition of a flameproof thread adaptor.

For ATEX certified versions of 846 transducers—the cable entry device and thread adapter shall be suitable for the
equipment, the cable and the conditions of use and shall be certified as Equipment (not a Component) under an EC
Type Examination Certificate to Directive 94/9/EC. Refer to table 2-3 for additional approval information.

For IECEx certified versions of 846 transducers—the cable entry device and thread adapter shall be suitable for the
equipment, the cable and the conditions of use and shall be certified as Equipment (not a Component). Refer to table
2-4 for additional approval information.

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846 Transducer

March 2015

Mounting

WARNING

This unit will vent to the atmosphere through the stroke port in the module cover and the exhaust port, located under the
nameplate. Do not remote vent this unit.

The transducer is designed for mounting on a control valve, 51 mm (2‐inch) diameter pipestand, wall, or panel. Figures
2-2, 2-3, 2-4, and 2-5 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.

CAUTION

Do not mount the transducer with the terminal compartment cover on the bottom as moisture, or any corrosive elements
in the plant atmosphere, may accumulate in the terminal compartment or pilot stage, resulting in transducer malfunction.

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 internal connections. Use 9.5 mm (3/8‐inch) outside
diameter tubing for the supply and output connections.

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Instruction Manual

D102005X012

Figure 2-1. Typical Dimensions and Connection Locations (Aluminum Construction Shown)

129

(5.07)

119

STROKE PORT

(4.68)

MODULE COVER WITH

MULTIPLE PORTS

NAMEPLATE

MOUNTING BOLT
HOLES 5/16‐18 (3)

EXHAUST PORT
UNDERNEATH NAMEPLATE

59

(2.31)

CONDUIT CONNECTION
1/2 ‐ 14 NPT

OUTPUT PORT
1/4 ‐ 18 NPT

35

(1.38)

29

(1.13)

29

(1.16)

COVER
REMOVAL

OUTPUT GAUGE PORT 1/4‐18 NPT

TEST PINS

WIRING CONNECTION

NOTE:

REFER TO FIGURE 2-5 FOR TRANSDUCER DIMENSIONS WITH
ATEX / IECEx FLAMEPROOF CERTIFICATIONS

B2473‐1

POSITIVE
NEGATIVE
INTERNAL GROUND

110

(4.33)

102

(4.00)

O‐RING GROOVE
FOR FILTER REGULATOR

SUPPLY PORT 1/4‐18 NPT

5/16‐18 (2)

mm

(INCHES)

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March 2015

Supply Pressure

WARNING

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

The supply medium must be clean, dry air that meets the requirements of ISA Standard 7.0.01 or ISO 8573-1. 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 6.4 normal m

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, 2-4, and 2-5 show the installation options.

3

/hr (240 scfh).

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

215
COVER
REMOVAL
CLEARANCE

NOTE:
1 THE MOUNTING POSITIONS SHOWN ALLOW ANY MOISTURE 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

67

(2.62)

78

(3.08)

156

(6.15)

(8.48)

CENTERLINE
OF ACTUATOR

YOKE MOUNTED

6

(0.25)

FOR PROPER MOISTURE DRAINAGE
THIS END MUST BE UP

191

(7.51)

MODULE
COVER
REMOVAL
CLEARANCE

1

13

(0.50)

FOR ATEX/IECEx
FLAMEPROOF UNITS:
BOLT ENGAGEMENT
NOT TO EXCEED

137

12.9 mm (0.51 INCHES).

(5.38)

5/16‐18 BOLTS

mm

(INCH)

13

846 Transducer

March 2015

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

Instruction Manual

D102005X012

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”)

(1.61)

VERTICAL MOUNT

MOUNTING BRACKET
(SEE DETAIL “A”)

FOR PROPER MOISTURE
DRAINAGE, THIS END
MUST BE UP

5/16‐18 HEX NUT (4 PLACES)

41

3

2‐INCH PIPESTAND MOUNTING

FOR ATEX/IECEx FLAMEPROOF
UNITS: BOLT ENGAGEMENT NOT TO
EXCEED 8.8 mm (0.35 INCHES).
5/16‐18 BOLT HOLES

1

MOUNTING BRACKET
(SEE DETAIL “A”)

ADAPTER PLATE
(SEE DETAIL “B”)

FOR ATEX/IECEx
FLAMEPROOF UNITS:
BOLT ENGAGEMENT
NOT TO EXCEED

8.1 mm (0.32 INCHES).
5/16‐18 BOLT HOLES

2

HORIZONTAL MOUNT

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

5/16‐18 x 3/4 BOLTS (4 PLACES)

5/16‐18 x 3/4 BOLTS
(4 PLACES)

MOUNTING BRACKET (SEE DETAIL “A”)

FOR PROPER
MOISTURE
DRAINAGE,
THIS END
MUST BE UP

1

1

GE06214 SHT 3

BOLT HOLES FOR STAINLESS

STEEL CONSTRUCTION

(COVERLOCK SHOWN)

GE06214 SHT 2

BOLT HOLES FOR ALUMINUM

CONSTRUCTION (COVERLOCK SHOWN)

NOTES:
1 THE MOUNTING POSITIONS SHOWN ALLOW ANY MOISTURE 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.
2 IF MOUNTED ON HORIZONTAL PIPE, THE I/P MUST BE ON TOP OF THE PIPE FOR PROPER MOISTURE DRAINAGE.
3 THIS DIMENSION IS 44 (1.74) FOR STAINLESS STEEL HOUSING.

14B7332
19B9484‐B
E0786

14

32

(1.25)

WALL/PANEL MOUNTING

(ALUMINUM HOUSING)

mm
(INCH)

Instruction Manual

D102005X012

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

846 Transducer

March 2015

4 X 10 (0.375)

(1.18)

5 X 10 (0.375)

U‐BOLT SLOTS
19 (0.75)

30

29

(1.13)

38

(1.50)

(3.50)

29

(1.16)

(2.312)

59

89

(.89)

23

89

(3.50)

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

DETAIL “A” MOUNTING BRACKET

29

(1.125

57

(2.25)

U‐BOLT SLOTS
19 (0.75)

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

38

(1.50)

29

(1.125

57

(2.25)

2 X 10 (0.375)

03311-0318

4 X 5 (0.188)

2 X 10 (0.375)

DETAIL “B” ADAPTER PLATE

4 X 5 (0.188)

mm
(INCH)

ADDITIONAL ADAPTOR PLATE (PART NUMBER 03311‐0318‐0001)

NOTES:

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

REQUIRED FOR I/P WITH STAINLESS STEEL HOUSING

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 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 67CFR filter‐regulator.

15

846 Transducer

March 2015

Figure 2-4. Typical Transducer Dimensions with Gauges

OUTPUT GAGE

FILTER‐
REGULATOR

SUPPLY
GAGE

Instruction Manual

D102005X012

81

(3.2)

14B7332‐D
E0776

49

(1.92)

72

(2.83)

67CFR
14‐18 NPT
SUPPLY CONN

9

(0.36)

Figure 2-5. Transducer Dimensions with ATEX / IECEx Flameproof Certifications

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

TERMINAL
COMPARTMENT
COVER

3.62
(92)

COVER LOCK

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

162

(6.38)

mm

(INCH)

16

B2465

INTERNAL
HEX DRIVE
ROUND HEAD
SCREW (3 mm)

4.75

(121)

HOUSING

129

(5.07)

MODULE COVER

121

(4.75)

mm

(INCH)