Fisher 646 User manual

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Type 646 Electro-Pneumatic Transducers
Introduction
Scope of Manual
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Description
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CAUTION
Dropping or rough handling of the
transducer can cause damage to the
converter module resulting in a shifted
output or a minimum output.
Specifications
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Figure 1. Electro-Pneumatic Transducer
Mounted on a Sliding-Stem Actuator
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Installation
Mounting
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Table 1. Specifications
Input Signal(1)
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Equivalent Circuit
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Output Signal(1)
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Supply Pressure(1)
Recommended: 53 SVLJ +417 EDU,
Minimum: 53 SVLJ +417 EDU,
Maximum: 83 SVLJ +617 EDU,
Maximum Steady•State Air Consumption(1)(2)
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Maximum Output Air Capacity(2)
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Performance(3)
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Temperature Effect: r7( RI IXOO VFDOH RXWSXW VSDQ
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Supply Pressure Effect: 315( RI IXOO VFDOH RXWSXW
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Vibration Effect: /HVV WKDQ 4( RI IXOO VFDOH RXWSXW
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Operating Ambient Temperature Limits
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Housing
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Hazardous Area Classifications
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Connections
Supply and Output Pressure: 4270LQFK 137 IH0
PDOH FRQQHFWLRQ
Vent: 4270LQFK 137 IHPDOH
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Adjustments
Zero and Span: 7ULP SRWHQWLRPHWHUV +53 WXUQ,IRU
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Mounting Position
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Approximate Weight (Transducer Only)
618 SRXQGV +419 NJ,
Actuator Stroking Time
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Figure 2. Typical Nameplate
INFORMATION IN THIS AREA IDENTIFIES
THE HAZARDOUS AREA APPROVALS FOR
THE PRODUCT SPECIFIED ON THE
EQUIPMENT ORDER.
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Figure 3. Output-Time Relationships for Type 646 Transducer
LOADING
EXHAUSTING
TIME (%)
0 102030405060708090100
0
10
20
30
40
50
60
70
80
90
100
OUTPUT
(% OF TYPE 646 OUTPUT SPAN)
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Pneumatic Connections
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Supply Pressure Requirements
WARNING
Personal injury or property damage may
occur from an uncontrolled process if
the supply medium is not a clean, dry,
oil-free, or non-corrosive gas. Industry
instrument air quality standards de-
scribe acceptable dirt, oil, and moisture
content. Due to the variability in nature
of the problems these influences can
have on pneumatic equipment, Fisher
Controls has no technical basis to rec-
ommend the level of filtration equipment
required to prevent performance degra-
dation of pneumatic equipment. A filter
or filter regulator capable of removing
particles 40 microns in diameter should
suffice for most applications. Use of
suitable filtration equipment and the es-
tablishment of a maintenance cycle to
monitor its operation is recommended.
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Diagnostic Connections
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Note
If the Type 646 transducer is used in a
valve assembly with a positioner, no
hook-up for diagnostic testing is re-
quired for the Type 646. The hook-up for
diagnostic testing should be installed at
the positioner.
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Figure 4. Dimensions and Connections
1.38
(35)
.25
(6.4)
5.00
(127.0)
2.86
(72.8)
4.02
(102.1)
6.00
(152.4) 6.00
(152.4)
3.12
(79.2)
1.88
(47.8) 1.62
(41.1)
5.00
(127.0)
.38
(9.5)
.38
(9.7)
INCH
(mm)
CENTERLINE
OF ACTUATOR
EXHAUST
1/4-18 NPT
OPTIONAL OUTPUT
OR GAUGE CONN
1/4-18 NPT
OUTPUT CONN
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OR OPTIONAL
M20 CONDUIT CONN
OPTIONAL
GAUGE
TYPE 67CFR
1/4-18 NPT
SUPPLY CONN
CAP
REMOVAL
CLEARANCE
2.25
(57)
4.19
(106.4)
2.44
(62.0)
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Figure 5. Diagnostics Hookup for Type 646 Transducer
BODY
BODY PROTECTOR
PIPE BUSHING
BODY PROTECTOR
BODY
PIPE BUSHING
PIPE TEE
PIPE NIPPLE
GAUGE
STEM
PROVIDED WHEN
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Vent
WARNING
If a flammable, toxic, or reactive gas is
to be used as the supply pressure me-
dium, personal injury and property dam-
age could result from fire or explosion
of accumulated gas or from contact with
toxic or reactive gas. The transducer/ac-
tuator assembly does not form a gas-
tight seal, and when the assembly is en-
closed, a remote vent line, adequate
ventilation, and necessary safety mea-
sures should be used. A remote vent
pipe alone cannot be relied upon to re-
move all hazardous gas. Vent line pip-
ing should comply with local and re-
gional codes and should be as short as
possible with adequate inside diameter
and few bends to remove exhaust gases
to a ventilated area.
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Electrical Connections
WARNING
For explosion-proof applications, dis-
connect power before removing the
housing cap.
For explosion-proof Class 1, Division 1
applications using metal conduit, install
a conduit seal no more than 18 inches
(457 mm) from the transducer. Personal
injury or property damage may result
from explosion if the seal is not
installed. For other explosion-proof ap-
plications, install the transducer in ac-
cordance with applicable codes.
For intrinsically safe installations, refer
to the nameplate and loop schematics at
the back of this manual (for CSA and
FM), or to instructions provided by the
barrier manufacturer, for proper wiring
and installation.
Figure 6. Typical Field Wiring Diagram
.
ï
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1
CONTROL
DEVICE
TRANSDUCER
HOUSING
TERMINAL
BLOCK
FIELD WIRING
EARTH
GROUND
NOTE:
FOR TROUBLESHOOTING OR MONITORING OPERATION,
AN INDICATING DEVICE CAN BE A VOLTMETER ACROSS
A 250 OHM RESISTOR OR A CURRENT METER.
1
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Figure 7. Equivalent Circuit
$93462,/
6.8V 6.8V 6.8V 0.7V
0.7V
0.7V
60 Ohms
60 Ohms
23 Ohms
4 - 20 mA +
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Operating Information
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WARNING
On explosion-proof instruments, re-
move electrical power before removing
the housing cap in a hazardous area.
Personal injury or property damage may
result from fire or explosion if power is
applied to the transducer with the cap
removed in a hazardous area.
For intrinsically safe areas, current mon-
itoring during operation must be with a
meter approved for use in hazardous
areas.
Calibration
Equipment Required
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Calibration Procedure
WARNING
For critical processes, this calibration
procedure requires taking the final con-
trol element out of service. To avoid per-
sonal injury or property damage due to
an uncontrolled process; provide some
temporary means of process control be-
fore beginning the calibration proce-
dure.
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Figure 8. Zero and Span Adjustments and Terminal Block
Connections (Cap Removed)
PRINTED
WIRING BOARDS ZERO
ADJUSTMENT
SPAN
ADJUSTMENT
TRANSDUCER
HOUSING
FIELD
WIRING
CONNECTION
+
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Principle of Operation
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Maintenance
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Figure 9. Type 646 Transducer Schematic
COIL
ZERO AND
SPAN CIRCUIT
DC CURRENT
INPUT
SIGNAL
CONVERTER
MODULE
RELAY
DIAPHRAGM
EXHAUST
DIAPHRAGM
OUTPUT
PRESSURE
MAGNET
BEAM
FLAPPER
NOZZLE
RESTRICTION
VALVE
PLUG
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WARNING
For explosion proof applications, dis-
connect power before removing the
housing cap. Personal injury or property
damage may result if power is not dis-
connected.
CAUTION
The presence of Fisher Controls person-
nel and also approval agency personnel
may be required if you service (other
than normal, routine maintenance, such
as calibration) or replace components
on a Type 646 that carries a third-party
approval. When you replace compo-
nents, use only components specified
by the factory. Substitution with other
components may void the third-party
approval. Also, always use proper com-
ponent replacement techniques, as pre-
sented in this manual. Improper tech-
niques can cause poor quality repairs
and impair the safety features of the de-
vice.
The converter module should never be
disassembled because the magnetism
in the coils will decrease permanently. If
troubleshooting or alignment attempts
indicate a faulty converter module, re-
place the module or return the transduc-
er to your Fisher Controls sales office or
sales representative for repair.
Troubleshooting
Electrical
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Figure 10. Valve Plug, Inner Valve Spring and
Body Plug Assembly
VALVE PLUG
(KEY 14)
ONE OF THREE
TABS ON VALVE PLUG
END OF SPRING COIL
BODY PLUG
(KEY 5)
O-RING
(KEY 8)
INNER VALVE
SPRING
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Parts Kits
Type 646 Transducer Repair Kit
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Parts List
Key Description Part Number
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Note
If the Type 646 Transducer is used in a valve
assembly with a positioner, no hook-up for
diagnostic testing is required for the Type 646.
The hook-up for diagnostic testing should be
installed at the positioner.
Front Output
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Key Description Part Number
Mounting Parts
Yoke Mounting With Type 67
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Figure 11. Type 646 Transducer Assembly
CONVERTER
MODULE
NOTE:
KEY NUMBER 49 IS NOT SHOWN
APPLY LUB/SEALANT
74%56:6ï(2'2&

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Figure 11. Type 646 Transducer Assembly (continued)
74%56:6ï(2'2&
Figure 12. Typical Type 646 Mounting With Type 67CFR Filter Regulator
6;E6<8;0$
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NOTES:
3/8-INCH TUBING SUPPLIED ONLY WHEN 646 IS FACTORY MOUNTED
KEY NUMBERS 24, 25, 27, 32, 33, 37, 38, 39 ARE NOT SHOWN.
SUPPLY
OUTPUT
1
1

7\SH 979
46
Loop Schematics
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CSA Schematics
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54%8939ï% 6+7 52'2&
NO CHANGE IN PART OR VENDOR OF PART ALLOWED
WITHOUT PRIOR APPROVAL OF : CSA
NO CHANGE IN PART OR VENDOR OF PART ALLOWED
WITHOUT PRIOR APPROVAL OF : CSA

7\SH 979
47
FM Schematics
54%893:0%2'2&
For information, contact Fisher Controls:
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