Introduction; Scope Of Manual; Description; Specifications - Fisher 2500 Series Instruction Manual

Type 2500
Contents (Continued)
Principle of Operation
Type 2500 Controller or Type 2500T
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Proportional Valve . . . . . . . . . . . . . . . . . . . . . . . . .
Type 2500S Controller
Type 2503 Controller
Maintenance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Controller/Transmitter from
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing Mounting Methods
Installing Controller/Transmitter on Sensor
Replacing the Bourdon Tube
Changing Action . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relay Deadband Testing (Type 2500 Controller
or 2500T Transmitter Only)
Replacing the Proportional Valve
Changing Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relay Assembly Maintenance
Parts Ordering
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Parts List
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Introduction

Scope of Manual

This manual provides installation, operating, calibra-
tion, maintenance, and parts ordering information for
the 2500 and 2503 Series pneumatic controllers and
transmitters used in combination with 249 Series dis-
placer sensors.
This manual does not include installa-
tion or maintenance procedures for the
supply pressure regulator, sensor, or
other devices. For that information, refer
to the appropriate instruction manual
for the other device.
Only qualified personnel should install, operate, and
maintain these controller/transmitters. If you have any
questions concerning these instructions, contact your
Fisher Controls sales office or sales representative
before proceeding.
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Note

Description

These instruments control or transmit the fluid level,
the level of interface between two fluids, or the density
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(specific gravity). Each unit consists of a 249 Series
displacer-type fluid level sensor and a 2500 or 2503
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Series pneumatic controller or transmitter. Figure 1
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shows a typical controller-sensor combination.
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Specifications

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Refer to table 1 for specifications.
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Installation

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The 2500 and 2503 Series controller/transmitters work
in combination with 249 Series displacer-type sensors.
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The factory attaches the controller/transmitter to the
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sensor, unless it is ordered separately.
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Sensor Assembly

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Table 2 lists sensors recommended for use with con-
troller/transmitters. For sensor installation and mainte-
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nance, refer to the appropriate sensor instruction
manual.
When replacing the sensor assembly,
the displacer may retain process fluid or
pressure. Personal injury or property
damage may occur due to sudden re-
lease of the pressure. Contact with haz-
ardous fluid, fire, or explosion can be
caused by puncturing, heating, or re-
pairing a displacer retaining process
pressure or fluid. This danger may not
be readily apparent when disassembling
the sensor assembly or removing the
displacer. Before disassembling the
sensor or removing the displacer, ob-
serve the more specific warning pro-
vided in the sensor instruction manual.

Uncrating

Unless ordered separately, the controller/transmitter is
attached to the sensor when shipped. Carefully un-
crate the assembly.
WARNING