REOTEMP Instruments PG25C2A4P24-G-T, PG25C2A4P21-G-T, PG25C2A4P30-G-T, PG25C2A4P15-G-T, PG25C2A4P35-G-T User manual

INSTALLATION AND OPERATING INSTRUCTIONS

REOTEMP PRESSURE GAUGES

I. MANUAL CONTENT

This manual contains installation, operation, maintenance,
calibration instructions for REOTEMP pressure gauges.
American National Standard ANSI B40.1 Gauges, Pressure
and Pressure Indicating Dial Type - Elastic Element, contains
valuable information including installation, operation,
calibration and safe usage. It is recommended that anyone
using, installing or calibrating pressure gauges be familiar
with this industry standard.

II. GENERAL

These gauges are available in vacuum, compound and
pressure ranges. (Refer to applicable data sheets.) A
general outline of construction is listed below:

(A) CASE: Available in Stainless, ABS, or Phenolic, with
back, front or no flange design.

(B) RING: Available with threaded or crimped.
(C) WINDOW: Available with glass, clear plastic or shatter-

resistant glass. (Refer to applicable data sheet.)
(D) CONNECTION: Bottom male or lower back male 2-

14"NPT, 3-18"NPT.
(E) DIAL: Available in 21/2”, 31/2” 4", 41/2” or 6" dial sizes.
(F) POINTER: Adjustable or plain pointer. (Refer to

applicable data sheet.)

III. INSTALLATION

A. STEM OR PIPE MOUNTING: Gauges mounted directly

on piping should be assembled with reasonable care, always
using the wrench grip provided on the pressure connection to
secure it to the threaded fitting. Do not use the gauge case
as a means of tightening the connection.
In order to extend the service life and continued accuracy,
the gauge should be protected as far as possible from
effects of mechanical vibration. It is desirable to isolate it
from severely vibrating machinery. The gauge may be rigidly
mounted to a non-vibrating surface and connected to the
pressure source using flexible tubing.

B. PANEL OR SURFACE MOUNTING: Gauges should be
free of piping strains when mounted. If mounting surface is
uneven, insert washers under flange of the gauge case to
obtain a three point suspension.

Refer to applicable data sheet for panel openings and
mounting dimensions for various types, sizes, and case
construction. When surface mounting a gauge, with a blow­out back, a clearance behind the gauge equal to the area of
the pressure relieving back must be provided. This can be
obtained by cutting a hole in the mounting surface equal to
the diameter of the pressure relieving back or by spacing the
gauge away from the mounting surface so as to provide an
annular area equal to the area of the pressure relieving back.

FOR

C. LOCATION: Gauges should be located where they will

not be subjected to abnormally high or low temperatures. A
slight error in indication will exist when the gauge is exposed
to a temperature above or below 70deg. Fahrenheit, the
temperature at which it was calibrated. Error due to
temperature is approximately 0.2% of indicated reading for a
10deg. Fahrenheit change, plus a small zero shift. The
gauge will generally read high under elevated temperatures
and low at low temperatures.
D. PROTECTORS: If gauges are to be used for steam
service, a siphon filled with water must be installed between
gauge and line to prevent live steam from entering the
Bourdon tube.
A gauge cock should be installed in the pressure line.
This might be the standard shut-off valve or a needle valve
for throttling pressure pulses. Should severe pulsation exist,
the gauge should be protected by adding a throttling orifice
screw in the gauge socket or by addition of a pulsation
damper, such as a snubber.
A diaphragm seal should be used in applications where
process media should not come in contact with gauge.

IV. OPERATION

A. Admit pressure slowly by throttling gauge cock. The

maximum, pressure at which a pressure gauge is
continuously operated shall not exceed 75% of full scale
pressure. The gauge selected should have a full scale
pressure of approximately twice the intended operating
pressure.
B. If it is desirable to compensate the indication for head
effect in the piping leg it can be accomplished by removing
bezel ring and window and resetting pointer using the pointer
adjusting screw. (This applies only to models with resetting
pointers.)
C. Relieving Case Pressure: Filled cases or other sealed
cases must be vented to avoid internal pressure, which can
affect accuracy. After installation, cut or pierce fill plug at top
of case for best accuracy.

V. MAINTENANCE

A. Replace broken gauge window promptly to keep dirt out
of the mechanism.
B. For gauges with safety blow-out back, check that

pressure relieving back is properly seated, free to operate
and that adequate clearance is provided behind the gauge.
(See Section 3.B)
C. Do not apply oil to movement or linkage since this may
result in sluggish operation.
D. Dependent upon the severity of the service, gauges
should be removed at intervals and compared with a suitable
master test gauge or dead weight tester. Minor corrections
may be accomplished by resetting the pointer if applicable.
Should movement appear sluggish or lack sensitivity, it
should then be disassembled for cleaning, overhaul or
replacement.

PGINST.1204

Find Quality Products Online at: [e-mail]

www.GlobalTestSupply.com