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OPLH-94122B page 1 of 4
OPLH / OPLHACS Series
■
Combination Level Indicating Gage and
Critical Level Limit Switch
■
High and Low Level Limit Contacts Are
Visible and Adjustable
■
Designed to Start and Stop Pumps to
Maintain Specific Levels
■
Indication only Murphygage
®
instrument
Available
■
Latching Control Relay Versions Available
Description
The OPLHC/OPLHACS Series Level
Swichgage instruments are combination
level indicating gages with adjustable low
and high limit switches. Limit switches can
be wired directly to electric pilot circuits to
operate alarms, shutdown or start/stop
pumps to maintain predetermined levels.
Surface mount or panel mount enclosure is
available for both model series. All models
feature a 4-1/2 in. (114 mm) dial for easy
viewing. Adjustable limit switches are
accessible from front of the Swichgage
instrument.
Specialized models are available for specific
applications involving engines or electric
motors.
OPLHC/OPLHACS
Series Swichgage instruments
include 2-adjustable, pilot duty, pointer type
contacts. Contacts have self-cleaning motion
to enhance electrical continuity. Models are
available with a rugged bourdon-tube or 316
stainless steel bellows sensing element for
greater accuracy and sensitivity in lower
ranges.
A “freeze-proof” sensor of 316 stainless steel
with Buna-N rolling diaphragm, is available.
The “freeze-proof” sensor (OPLHAFP)
inserts approx., 2 in. (52 mm) inside a tank.
OPLHBP/OPLHABPS
Internal latching control relays are available
to provide ON/OFF automation for electric
motor applications.
OPLHC and OPLHACS series are avail-
able in indication only Murphygage models
(OPLHAGS). See Page 2 to determine the
model for your application.
Applications
•
Saltwater Disposal Systems
•
Waterflood Systems
•
Diesel Day Tanks
•
Oil Storage Tanks
Basic Operation
The OPLHC/OPLHACS series operate from
static head pressure. Pressure is transmitted
to the process connection of the Swichgage
instrument.
From here the pressure flexes the bourdon
tube or operates the 316 stainless steel bel-
lows (depending on which model you have).
The bourdon tube/bellows oper-
ates the stainless
steel rotary
geared movement
which in turn operates
the indicating pointer on
the face of the dial. When
the pointer (A) closes with the
limit contact (B), a control circuit
(C) is completed and signals an alarm and/or
shutdown or starts/stops a pump.
Warranty
A limited warranty on materials and workmanship
is given with this FW Murphy product. A copy of
the warranty may be viewed or printed by going to
www.fwmurphy.com/support/warranty.htm
R
Selected configurations
are third party listed. Consult
FWMurphy for details.
OPLHFC
OPLHACS
A
Adjustment
Knob
B
C
OPLH-94122B
Revised 03-06
Catalog Section 15
4-1/2 in. (114 mm) Dial
Level Swichgage
®
instrument