Emerson Fisher 846 User manual

D102005X012
www.Fisher.com
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. . . .
4. Principle of Operation
Electronic Circuit 4–1. . . . . . . . . . . . . . . . . . . . . . . . .
Magnetic Actuator 4–1. . . . . . . . . . . . . . . . . . . . . . . .
Pilot Stage 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Booster Stage 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Troubleshooting
Diagnostic Features 5–1. . . . . . . . . . . . . . . . . . . . . .
Stroke Port 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Pressure Reading (RPR) 5–1. . . . . . . . .
Using the HARTRCommunicator 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

Type 846 and Model 3311 Instruction Manual
Form 5739
February 2002
1–2
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.
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.
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
Figure1-1. 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.
Specifications
Specifications for the Type 846 and Model 3311
transducer are listed in table 1-1.

Introduction
Instruction Manual
Form 5739
February 2002
1–3
Figure1-2. Transducer Modular Construction
A6643/IL
MODULE COVER
MODULE FINAL
ASSEMBLY
ELECTRONIC
CIRCUIT BOARD
MODULE HOUSING
TERMINAL BLOCK
TERMINAL
COMPARTMENT
COVER

Type 846 and Model 3311 Instruction Manual
Form 5739
February 2002
1–4
Table1-1. 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)
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:(1) –40 to 85_C (–40 to 185_F).
Storage:(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.
–Continued–

Introduction
Instruction Manual
Form 5739
February 2002
1–5
Table1-1. 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 Vp-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,
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 (Tamb=40_C)
EEx ia IIC T4 (Tamb=80_C)
Parameters: Umax:in=30 V dc, Imax:in=200 mA,
Wmax:in=0.8 W (T5)/1.0 W (T4), Ceq=0,
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 (Tamb=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 (Tamb=80_C); Class
I, Zone 2.
Parameter: Umax=12 V dc
Russian (GOST) Approvals
EG Flameproof: 1 ExdIICT6X
IG Intrinsically Safe:
0ExiaIICT6 (Tamb = 40_C)
0ExiaIICT5 (Tamb=40_C)
0ExiaIICT4 (Tamb=80_C)
–Continued–

Type 846 and Model 3311 Instruction Manual
Form 5739
February 2002
1–6
Table1-1. Specifications (continued)
Enclosure Rating
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
Housing: Low-copper aluminum or 316 stainless
steel
O-Rings: Nitrile except silicone for sensor
O-rings
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
Stainless Steel: 6.7 kg (14.8 lb) excluding
options
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.
Figure1-3. Typical Nameplate
INFORMATION IN THIS AREA
IDENTIFIES THE HAZARDOUS AREA
CLASSIFICATION AND APPROVALS
FOR THE PRODUCT SPECIFIED ON
THE EQUIPMENT ORDER
B2464
CE MARK APPEARS ONLY ON UNITS
WITH EUROPEAN APPROVALS
Table1-2. EMC Immunity Performance Criteria
Port Phenomenon Basic
Standard Test Level Performance Criteria
Electrostatic discharge (ESD) IEC 61000-4-2 4 kV contact
8 kV air A
Enclosure Radiated EM field IEC 61000-4-3 80 to 1000 MHz, 10 V/m
1 kHZ AM at 80% A
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
I/O signal/control Surge IEC 61000-4-5 1 kV (line to ground only) B I/O signal/control Conducted RF IEC 61000-4-6 150 kHZ to 80 MHz at 3 volts B
Specification limit = ±1% of span

Introduction
Instruction Manual
Form 5739
February 2002
1–7
Table1-3. Model Number Table
Model Product Description
3311/0846 Current-to-Pressure Transducer
Code Action
D
RDirect—Output changes directly with input Reverse—Output changes inversely with input
Code Performance
S
MStandard (Typical Output: 3–15 psi; Wide rangebility betweeen 1 and 18 psi) Multirange (Typical Outputs: 3–27 psi, 6–30 psi, and 5–25 psi; Wide rangebility betweeen 0.5 and 33.0 psi)
Code Input
1
2
3
4
4–20 mA dc
4–12 mA dc
12–20 mA dc
Specify (Consult factory for other input ranges between 4–20 mA and 10–50 mA)
Code Output
J
K
L
M
W
H
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)
0.2–1.0 kg/cm2for direct action (1.0–0.2 kg/cm2for 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
Specify (Consult factory for other calibration requirements; minimum span is 6 psi for direct and 11 psi for
reverse-acting units)
Code Electrical Connections/Housing Material
1
21/2–14 NPT/Aluminum 1/2–14 NPT/316 stainless steel
Code Options
B1
B2
B3
B4
F2
F3
G1
G2
G7
G8
G9
GA
GB
GE
GF
GG
P1
R1(3)
A1(1)
Q4
K5
C6
I1
N1
E9(2)
K7
EG(2)
IG
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
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
Attach all applicable options at the factory (i.e., filter-regulator and gauges)
Calibration data sheet
Factory Mutual (FM) explosion-proof and intrinsic safety approval
Canadian Standards Association (CSA) explosion-proof and intrinsic safety approval
BASEEFA/CENELEC intrinsic safety certification
BASEEFA Type N certification
ISSeP/CENELEC flameproof certification
Standards Association of Australia (SAA) flameproof intrinsic safety, and Type n certification
Russian GOST flameproof certification
Russian GOST intrinsic safety certification
Typical Model Number: 3311 D S 1 J 1 B1
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.
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.

Type 846 and Model 3311 Instruction Manual
Form 5739
February 2002
1–8

Installation
Instruction Manual
Form 5739
February 2002
2–1
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:
DEnsure that all bolts are fully tightened. The
recommended torque is 22 NSm (16 lbfSft).
DBolts 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.
DDo 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

Type 846 and Model 3311 Instruction Manual
Form 5739
February 2002
2–2
Figure2-1. Dimensions and Connection Locations
129
(5.07)
119
(4.68)
STROKE PORT
OUTPUT GAUGE PORT
1/4-18 NPT
NAMEPLATE EXHAUST PORT
UNDERNEATH NAMEPLATE
CONDUIT CONNECTION
1/2 - 14 NPT
OUTPUT PORT
1/4 - 18 NPT
MODULE COVER WITH
MULTIPLE PORTS
WIRING CONNECTION
35
(1.38)
29
(1.13)
59
(2.31) COVER
REMOVAL
110
(4.33)
102
(4.00)
5/16-18 (2)
O-RING GROOVE
FOR FILTER
REGULATOR
SUPPLY PORT
1/4-18 NPT
POSITIVE
NEGATIVE
GROUND
(mm)
INCHES
B2473-1/IL
TEST PINS
29
(1.16)

Installation
Instruction Manual
Form 5739
February 2002
2–3
6
(.25)COVER REMOVAL
CLEARANCE
MODULE
COVER
REMOVAL
CLEARANCE
FOR PROPER MOISTURE
DRAINAGE THIS END
MUST BE UP
Figure2-2. Typical Dimensions with Type 67CFR Filter/Regulator and Gauges
67
(2.62)
78
(3.08)
CENTERLINE
OF ACTUATOR
191
(7.51)
137
(5.38)
YOKE MOUNTED
NOTE:
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.
1
14B7361-D
A6626–3/IL
mm
(INCH)
13
(.50)
156
(6.15)
1
215
(8.48)
(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.

Type 846 and Model 3311 Instruction Manual
Form 5739
February 2002
2–4
Figure2-3. Typical Transducer Mounting with Universal Mounting Bracket
32
(1.25)
FOR PROPER
MOISTURE
DRAINAGE,
THIS END
MUST BE UP
5/16-18 x 3/4 BOLTS
(4 PLACES)
MOUNTING BRACKET (SEE DETAIL “A”)
WALL/PANEL MOUNTING
5/16-18 x 3/4 BOLTS (4 PLACES)
5/16-18 HEX NUT (4 PLACES)
ADAPTER PLATE
(SEE DETAIL “B”)
MOUNTING BRACKET
(SEE DETAIL “A”)
FOR PROPER MOISTURE
DRAINAGE, THE I/P
MUST BE MOUNTED ON
TOP OF THE PIPE
5/16-18 x 5/8 BOLTS
FOR PROPER
MOISTURE
DRAINAGE,
THIS END
MUST BE UP
ADAPTER PLATE
(SEE DETAIL “B”)
MOUNTING BRACKET
(SEE DETAIL “A”)
41
(1.61)
U BOLT
VERTICAL MOUNT
ADDITIONAL ADAPTER PLATE
PART NUMBER 03311-0318-0001
REQUIRED FOR I/P WITH
STAINLESS STEEL HOUSING
3
HORIZONTAL MOUNT
2
ADDITIONAL ADAPTER
PLATE PART NUMBER
03311-0318-0001
REQUIRED FOR I/P
WITH STAINLESS STEEL
HOUSING
2-INCH PIPESTAND MOUNTING
NOTES:
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.
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
2
14B7332
19B9484-B
E0786 / IL
mm
(INCH)
1
1
1
1

Installation
Instruction Manual
Form 5739
February 2002
2–5
Figure2-3. Typical Transducer Mounting with Universal Mounting Bracket (Continued)
mm
(INCH)
30
(1.18)
23
(.89)
4 X 10 (0.375)
5 X 10 (0.375)
89
(3.50)
89
(3.50)
59
(2.312)
29
(1.16)
29
(1.13)
38
(1.50)
U-BOLT SLOTS
19 (0.75)
29
(1.125 57
(2.25)
2 X 10 (0.375)
4 X 5 (0.188)
DETAIL A" MOUNTING BRACKET
DETAIL B" ADAPTER PLATE
FOR STAINLESS STEEL HOUSING,
ALIGN 4 HOLES WITH I/P HOUSING
FOR ALUMINUM HOUSING,
ALIGN 3 HOLES WITH I/P HOUSING
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
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
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:
Dpressure beyond the top of the
gauge scale.

Type 846 and Model 3311 Instruction Manual
Form 5739
February 2002
2–6
Figure2-4. Transducer Dimensions with CENELEC Certifications and Gauges
TERMINAL
COMPARTMENT
COVER
COVER LOCK
INTERNAL
HEX DRIVE
ROUND HEAD
SCREW (3 mm)
4.75
(121) MODULE COVER
HOUSING
EXTERNAL EARTHING CONNECTION, SST TERMINAL
CLAMP AND SLOTTED M5 SCREW AND SPLIT
RING WASHER
3.62
(92)
162
(6.38)
121
(4.75)
mm
(INCH)
B2465/IL
TRANSDUCER WITH CENELEC CERTIFICATION
TRANSDUCER WITH GAUGES
SUPPLY
GAGE
49
(1.92)
72
(2.83) 9
(0.36)
81
(3.2)
OUTPUT GAGE
FILTER-
REGULATOR
14B7332-D
E0776 / IL
1/4-18 NPT
OUTLET CONN
PLUGGED WHEN
GAUGE NOT
FURNISHED
TYPE 67CFR
14-18 NPT
SUPPLY CONN

Installation
Instruction Manual
Form 5739
February 2002
2–7
Dexcessive vibration.
Dpressure pulsation.
Dexcessive instrument
temperature.
Dcorrosion of the pressure
containing parts.
Dother 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

Type 846 and Model 3311 Instruction Manual
Form 5739
February 2002
2–8
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).
In the same situation, the output of the reverse
action unit will increase to near supply pressure.

Calibration
Instruction Manual
Form 5739
February 2002
3–1
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.
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
DFull Range Input, Direct Action
DSplit Range Input, Direct Action
DFull Range Input, Reverse Action
DSplit Range Input, Reverse Action
Multirange Performance
DFull Range Input, Direct Action
DSplit Range Input, Direct Action(1)
DFull Range Input, Reverse Action
DSplit 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.
Figure3-1. Connecting a Current or Voltage
Source for Calibration
ADJUST THE CURRENT
SOURCE TO PROVIDE
THE 4 AND 20 mA
SET POINTS
CALIBRATION USING A CURRENT SOURCE
CALIBRATION USING A VOLTAGE 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 o m RESISTOR
A6644-1 / IL
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.

Type 846 and Model 3311 Instruction Manual
Form 5739
February 2002
3–2
Table3-1 Type 846 and Model 3311 I/P Rangeability Matrix
Input Output Pressure Range (psi) (Performance Code) Input
Range Common Ranges Misc. Std. Split High Range Splits
3–15
(S,M) .5–30 (M) 3–27 (M) 6–30 (M) 5–25 (M) 0.5–6 (S,M) .5–18 (S,M) 3–9 (S,M) 9–15 (S,M) .5–15 (S,M) 15–30 (M) 15–27 (M) 6–18 (S,M) 18–30 (M) 5–15 (S,M) 15–25 (M)
4–20 n n n n n DnD D nU U nUnU
4–12
12–20 n n
n n
Jn Jn JD Dn JD DD Dn JU
n
U
n
n
n
U
n
n
n
U
n
4–8
8–12
12–16
16–20
n
n
J
J
n
n
J
J
n
n
J
J
n
n
n
J
n
n
J
J
n
n
J
J
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.
Assembly in Section 6 for an explanation of how to
engage the module final assembly.
5. Connect the air supply to the air supply port.
6. Connect a precision output indicator to the output
signal port.
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.
9. Connect the current source (or voltage source)
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.
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.
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
of the span screw.
12. Repeat Steps 10 and 11 to verify and complete
the calibration.
Multirange Performance: Full Range
Input,(2) Direct Action
Use the following procedure with a multirange
performance unit to achieve the desired direct 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.
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.
2. Consult factory for calibration of multirange performance units with split range
input.

Calibration
Instruction Manual
Form 5739
February 2002
3–3
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
Input(2), Reverse Action
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

Type 846 and Model 3311 Instruction Manual
Form 5739
February 2002
3–4
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.