Table of Contents
3710 and 3720 Positioners
Contents (cont'd)
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Introduction
Scope of Manual
This instruction manual includes installation,
operation, calibration, maintenance, and parts
ordering information for the Type 3710 pneumatic
positioner and Type 3720 electro-pneumatic
positioner. This manual also provides field
installation and maintenance information for the
Type 3722 electro-pneumatic converter. Refer to
separate instruction manuals for information on the
actuator, control valve, and other accessories.
No person may install, operate, or maintain a Type
3710 pneumatic positioner, a Type 3720
electro-pneumatic positioner or a Type 3722
electro-pneumatic converter without first D being fully
trained and qualified in valve, actuator and
accessory installation, operation and maintenance,
and D carefully reading and understanding the
contents of this manual. If you have any questions
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about these instructions, contact your Fisher
office.
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Description
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The Type 3710 pneumatic positioner and the Type
3720 electro-pneumatic positioner are used with
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either diaphragm actuators (spring return) or piston
rotary actuators (spring return or double-action) as
shown in figure 1. These positioners provide a valve
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ball or disk position for a specific input signal. These
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positioners can easily be configured to provide
single- or double-action output for rotary actuators.
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The Type 3710 pneumatic positioner accepts a
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pneumatic input signal. The Type 3720
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electro-pneumatic positioner accepts a milliampere
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(mA), direct current (dc), input signal. Refer to table
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1 for an explanation of type numbers.
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43
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The Type 3710 pneumatic positioner provides a
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valve position for a standard pneumatic input signal.
The positioner may also be split-ranged. See table 3
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for input signal ranges.
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The Type 3720 electro-pneumatic positioner
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provides a valve position for a milliampere (mA),
direct current (dc), input signal. The positioner may
also be split-ranged. See table 3.
Positioner to Actuator Mountings List
The positioner mounts directly to the actuator cover
plate of Types 1051, 1052, and 1061 actuators. See
table 4 for actuator sizes.
Figure 2 shows a positioner ready for mounting on a
piston rotary actuator. A mounting plate (key 43) is
used to mount the positioner base plate to Types
1031, 1032, 1051, 1052, 1061, and 1062 actuators.
See table 4 for actuator sizes.
The positioner also mounts on a size 25 or 50 Type
585 and 585R sliding-stem actuator. A mounting
plate (key 43) is used to mount the positioner base
plate to the actuator.
Instruction Manual
Form 5300
July 2005
R
sales
Table of Contents
