Emerson Fisher 646 Instruction Manual
Instruction Manual
D101351X012
Fisherr 646 Electro‐Pneumatic Transducer
646 Transducer
January 2015
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 3.................................
Specifications 4...............................
Educational Services 4.........................
Installation 4..................................
Hazardous Area Classifications and
Special Instructions for “Safe Use” and
Installation in Hazardous Locations 5...........
CSA 5....................................
FM 6.....................................
ATEX 6...................................
IECEx 7...................................
Mounting 8..................................
Pneumatic Connections 9......................
Supply Pressure Requirements 9.............
Diagnostic Connections 10..................
Vent 10..................................
Electrical Connections 10.......................
Operating Information 12........................
Calibration 12................................
Equipment Required 12.....................
Calibration Procedure 12....................
Principle of Operation 13........................
Maintenance 14................................
Troubleshooting 14............................
Converter Module Replacement 15..............
Relay Maintenance 16..........................
Figure 1. Fisher 646 Electro‐Pneumatic Transducer
Mounted on a Sliding‐Stem Actuator
W6783‐1/IL
Parts Ordering 18...............................
Parts Kits 18...................................
Parts List 18...................................
Loop Schematics 22.............................
Introduction
Scope of Manual
This instruction manual provides installation, operation, maintenance, and parts ordering information for the Fisher
646 transducer. Refer to separate manuals for instructions covering equipment used with the transducer.
Do not install, operate or maintain a 646 electro‐pneumatic 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.
www.Fisher.com
646 Transducer
January 2015
Table 1. Specifications
Instruction Manual
D101351X012
Input Signal
4-20 mA DC, constant current with 30 VDC maximum
compliance voltage
Equivalent Circuit
The 646 equivalent circuit is a series circuit consisting
of a constant voltage drop (battery) of approximately
2.1 VDC and a total resistance of 143 ohms. Input is
shunted by three 6.8 V zener diodes (see figure 6).
Output Signal
0.2 to 1.0 bar (3 to 15 psig) direct acting only
Supply Pressure
(1)
Recommended: 1.4 bar (20 psig)
Minimum: 1.4 bar (20 psig)
Maximum: 3.4 bar (50 psig)
Average Steady‐State Air Consumption
(2)(3)
0.08 m3/hr (3 scfh) at 1.4 bar (20 psi) supply pressure
Maximum Output Air Capacity
(2)
8.0 m3/hr (300 scfh) at 1.4 bar (20 psig) supply
pressure
Emissions—Class A
ISM equipment rating: Group 1, Class A
Operating Ambient Temperature Limits
(1)
-40 to 71_C (-40 to +160_F)
Electrical Classification
CSA—Intrinsically Safe, Explosion proof, Type n,
Dust‐Ignition proof, DIV 2
FM—Intrinsically Safe, Explosion proof, Type n,
Non‐incendive, Dust‐Ignition proof
ATEX—Intrinsically Safe, Flameproof, Type n
IECEx—Intrinsically Safe, Flameproof, Type n
Refer to Hazardous Area Classifications and Special
Instructions for the “Safe Use” and Installation in
Hazardous Locations starting on page 5 for
additional information.
Housing
CSA—Type 3 Encl.
FM—NEMA 3, IP54
ATEX—IP64
IECEx—IP54
Mount instrument with vent on side or bottom if
weatherproofing is a concern.
Performance
(4)
Reference Accuracy: ±0.5% of full scale output span;
includes combined effects of hysteresis, linearity, and
deadband
Independent Linearity: ±0.5% of full scale output span
Hysteresis: 0.4% of full scale output span
Frequency Response: Gain is attenuated 3 dB at 10 Hz
with transducer output signal piped to a typical
instrument input
Temperature Effect: ±4% of full scale output span per
55_C (100_F) change
Supply Pressure Effect: 0.2% of full scale output span
per psi supply pressure change
Vibration Effect: Less than 1% of full scale output span
when tested to SAMA PMC 31.1, Condition 3
Electromagnetic Compatibility
Meets EN 61326‐1 (First Edition)
Immunity—Industrial locations per Table 2 of
the EN 61326‐1 standard. Performance is
shown in table 2 below.
2
-continued-
Other Classifications/Certifications
INMETRO
— National Institute of Metrology, Quality
and Technology (Brazil)
KGS— Korea Gas Safety Corporation (South Korea)
Contact your Emerson Process Management sales
office for classification/certification specific
information
Connections
Supply and Output Pressure: 1/4 NPT internal
connection
Vent: 1/4 NPT internal
Electrical: 1/2‐14 NPT conduit connection
Wire Size: 18 to 22 AWG
Adjustments
Zero and Span: Trim potentiometers (20 turn) for
zero and span adjustments are located under the
housing cap (see figure 7)
Instruction Manual
D101351X012
Table 1. Specifications (Continued)
646 Transducer
January 2015
Mounting Position
Any position is acceptable for standard pipestand,
panel, or actuator mounting. For weatherproof
housing, mount the transducer so the vent can drain.
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
Approximate Weight (Transducer Only)
1.6 kg (3.5 pounds)
Actuator Stroking Time
See figure 2
NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 ‐ Process Instrument Terminology.
1. The pressure and temperature limits in this document and any applicable standard or code limitation should not be exceeded.
2. Normal m
3. Average flow rate determined at 12 mA and 0.6 bar (9 psig) output.
4. Performance values are obtained using a transducer with a 4 to 20 mA DC input signal and a 0.2 to 1.0 ba (r3 to 15 psig) output signal at an ambient temperature of 24_C (75_F).
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 2. EMC Summary Results—Immunity
Port Phenomenon Basic Standard Test Level
Electrostatic discharge (ESD) IEC 61000‐4‐2
Enclosure
I/O signal/control
1. A = No degradation during testing. B = Temporary degradation during testing, but is self‐recovering.
Specification Limit = +/‐ 1% of span.
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 61000‐4‐6 150 kHz to 80 MHz at 3 Vrms A
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 1 kHz AM at 80%
2000 to 2700 MHz @ 1V/m with 1 kHz AM at 80%
Performance
Criteria
A
A
(1)
Figure 2. Output‐Time Relationships for Fisher 646 Transducer
100
90
80
70
60
50
OUTPUT
40
30
(% OF 646 OUTPUT SPAN)
20
10
0
0 102030405060708090100
A6815 / IL
LOADING
EXHAUSTING
TIME (%)
Description
The transducer, shown in figure 1, receives a 4-20 milliampere DC input signal and transmits a proportional 0.2 to 1.0
bar (3 to 15 psig) pneumatic output pressure to a final control element. A typical application is in electronic control
loops where the final control element is a control valve assembly that is pneumatically operated. The input signal and
output pressure range of the transducer is indicated on the nameplate attached to the housing.
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646 Transducer
January 2015
Instruction Manual
D101351X012
CAUTION
Dropping or rough handling of the transducer can cause damage to the converter module resulting in a shifted output or a
minimum output.
WARNING
This product does not meet third party approvals (CSA, FM, ATEX, or IECEx) for use with natural gas as the supply medium.
Use of natural gas as the supply medium can damage the instrument and result in personal injury or property damage from
fire or explosion.
Should you need an instrument for use with natural gas, Fisher 846 and i2P‐100 electro‐pneumatic transducers both meet
third party approvals for use with natural gas as the supply medium. Contact your Emerson Process Management sales
office for information on these products.
Specifications
Specifications for the 646 transducer are listed in table 1.
Educational Services
For information on available courses for the 646 electro‐pneumatic transducer, as well as a variety of other products,
contact:
Emerson Process Management
Educational Services, Registration
Phone: +1-641‐754‐3771 or +1-800‐338‐8158
e‐mail: education@emerson.com
http://www.emersonprocess.com/education
Installation
WARNING
Always wear protective clothing, gloves, and eyewear when performing any installation operations to avoid personal
injury.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
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Instruction Manual
D101351X012
646 Transducer
January 2015
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.
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, Type n Dust‐Ignition proof, DIV 2
No special conditions for safe use.
Refer to table 3 for additional information.
Table 3. Hazardous Area Classifications—CSA (Canada)
Certification Body Certification Obtained Entity Rating Temperature Code
CSA
Intrinsically Safe
Ex ia IIC T4/T5 per drawing GE28591 (see figure 12)
Ex ia Intrinsically Safe
Class I, II, Division 1 GP A,B,C,D,E,F,G T4/T5
per drawing GE28591 (see figure 12)
Explosion-proof
Ex d IIC T6
Class I, Division I, GP A,B,C,D T6
Type n
Ex nL IIC T6
Class I, Division 2, GP A,B,C,D T6
Class II, Division 1, Groups E,F,G T6
Class II, Division 2, GP F,G T6
Vmax = 30 VDC
Imax = 150 mA
Pi = 1.0 W
Ci = 0 nF
Li = 0 mH
- - - T6 (Tamb ≤ 71°C)
- - - T6 (Tamb ≤ 71°C)
- - - T6 (Tamb ≤ 71°C)
T4 (Tamb ≤ 71°C)
T5 (Tamb ≤ 40°C)
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646 Transducer
January 2015
Instruction Manual
FM
Intrinsically Safe, Explosion proof, Type n Non‐incendive, Dust‐Ignition proof
No special conditions for safe use.
Refer to table 4 for additional information.
Table 4. Hazardous Area Classifications—FM (United States)
Certification Body Certification Obtained Entity Rating Temperature Code
FM
Intrinsically Safe
Class 1 Zone 0 AEx ia IIC T4/T5
per drawing GE28590 (see figure 13)
Class I, II, III Division 1 GP A,B,C,D,E,F,G
T4/T5 per drawing GE28590 (see figure 13)
Explosion-proof
Class 1 Zone 1 AEx d IIC T6
Class I, Division I, GP A,B,C,D T6
Type n
CL 1 Zone 2 AEx nL IIC T6
Class I, Division 2, GP A,B,C,D T6
Class II, Division 1, Groups E,F,G T6
Class II, Division 2, GP F,G T6
Vmax = 30 VDC
Imax = 150 mA
Pi = 1.0 W
Ci = 0 nF
Li = 0 mH
- - - T6 (Tamb ≤ 71°C)
- - - T6 (Tamb ≤ 71°C)
- - - T6 (Tamb ≤ 71°C)
T4 (Tamb ≤ 71°C)
T5 (Tamb ≤ 40°C)
D101351X012
ATEX
Standards Used for Certification
EN 60079-0: 2012 EN 60079-31: 2009
EN 60079-1: 2007 EN 61241-0: 2006
EN 60079-11: 2012 EN 61241-1: 2004
EN 60079-15: 2010 EN 61241-11: 2006
Special Conditions for Safe Use
Intrinsically Safe
This equipment is intrinsically safe and can be used in potentially explosive atmospheres.
The electrical parameters of certified equipment which can be connected to the device must not exceed the following
values: U
Ambient temperature: T5, at Tamb = 40_C ; T4, at Tamb = 71_C
Flameproof
The flame path is other than required by EN 60079‐1. Contact the manufacturer for information on the dimensions of
the flameproof joints.
Electrical connections are typically made using either cable or conduit.
≤ 30 VDC ; I0 ≤ 150 mA ; P0 ≤ 1 W
0
D If using a cable connection, the cable entry device shall be certified in type of explosion protection flameproof
enclosure “d”, suitable for the conditions of use and correctly installed.
For ambient temperatures over 70_C, cables and cable glands suitable for at least 90_C shall be used.
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Instruction Manual
D101351X012
646 Transducer
January 2015
D If using a rigid conduit connection, an Ex d certified sealing device such as a conduit seal with setting compound
shall be provided immediately to the entrance of the enclosure.
For ambient temperatures over 70_C, the wiring and setting compound in the conduit seal shall be suitable for at least
90_C.
Type n
No special conditions for safe use.
Refer to table 5 for additional information.
Table 5. Hazardous Area Classifications—ATEX
Certificate Certification Obtained Entity Rating Temperature Code
II 1 G & D
ATEX
Intrinsically Safe
Gas
Ex ia IIC T4/T5 Ga
Dust
Ex ia IIIC Da T155 °C (Tamb
Flameproof
Gas
Ex d IIC T6 Gb
Dust
Ex tb IIIC T74 °C Db (Tamb ≤ 71°C)
Type n
Gas
Ex nA IIC T6 Gc
Dust
Ex tc IIIC T74 °C Dc (T
≤ 71°C) / T124°C (Tamb ≤ 40°C)
II 2 G & D
II 3 G & D
amb ≤ 71°C)
Ui = 30 VDC
Ii = 150 mA
Pi = 1.0 W
Ci = 0 nF
Li = 0 mH
T4 (Tamb ≤ 71°C)
T5 (Tamb ≤ 40°C)
- - -
T6 (Tamb ≤ 71°C)
- - -
- - -
T6 (Tamb ≤ 71°C)
- - -
- - -
IECEx
Conditions of Certification
Intrinsically Safe
WARNING
Substitution of components may impair intrinsic safety.
-40_C ≤ Ta ≤ +71_C ; T5 (Ta ≤ +40_C) ; T4 (Ta ≤ +71_C)
Entity Parameters: U
30 V , li = 150 mA , Pi = 1.0 W , Ci = 0 nF , Li = 0 mH
i =
Flameproof
WARNING
Disconnect power before opening.
-40_C ≤ Ta ≤ +71_C ; T6 (Ta ≤ +71_C)
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646 Transducer
January 2015
Instruction Manual
Type n
WARNING
Disconnect power before opening.
-40_C ≤ Ta ≤ +71_C ; T6 (Ta ≤ +71_C)
Refer to table 6 for additional information.
Table 6. Hazardous Area Classifications—IECEx
Certificate Certification Obtained Entity Rating Temperature Code
Ui = 30 VDC
Ii = 150 mA
Pi = 1.0 W
Ci = 0 nF
Li = 0 mH
T4 (Tamb ≤ 71°C)
T5 (Tamb ≤ 40°C)
- - - T6 (Tamb ≤ 71°C)
- - - T6 (Tamb ≤ 71°C)
IECEx
Intrinsically Safe
Gas
Ex ia IIC T4/T5 Ga
Flameproof
Gas
Ex d IIC T6 Gb
Type n
Gas
Ex nA IIC T6 Gc
D101351X012
Mounting
When a transducer is ordered as part of a control valve assembly, the factory mounts the transducer on the actuator
and connects the necessary tubing, then adjusts the transducer as specified on the order.
Transducers also can be ordered separately for mounting on a control valve assembly already in service, or for
mounting on a 2 inch diameter pipestand, a flat surface, or a bulkhead. The transducer may be ordered either with or
without mounting parts. Mounting parts include a mounting plate and bolts and, if ordered for pipestand mounting, a
pipe clamp. Tubing is not included if the transducer is not factory mounted. Use 10 mm (3/8‐inch) diameter tubing for
all input and output connections. The length of tubing between the transducer output and the final control element
should be as short as possible. Transducer overall dimensions are shown in figure 3. If weatherproofing is required,
mount the transducer so that the vent can drain. Do not allow moisture or condensate to collect in the vent.
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