OPLH-94122B
Revised 03-06
4-1/2 in. (114 mm) Dial
Catalog Section 15
Level Swichgage® instrument
OPLH / OPLHACS Series
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Combination Level Indicating Gage and
Selected configurations
are third party listed. Consult
FWMurphy for details.
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
OPLHACS
Available
Latching Control Relay Versions Available
OPLHFC
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.
Description
Basic Operation
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.
The OPLHC/OPLHACS series operate from
static head pressure. Pressure is transmitted
to the process connection of the Swichgage
instrument.
OPLHBP/OPLHABPS
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-
Internal latching control relays are available
to provide ON/OFF automation for electric
motor applications.
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 and OPLHACS series are avail-
able in indication only Murphygage models
(OPLHAGS). See Page 2 to determine the
model for your application.
Adjustment
ates the stainless
Knob
C
B
steel rotary
geared movement
which in turn operates
the indicating pointer on
A
Applications
the face of the dial. When
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Saltwater Disposal Systems
Waterflood Systems
Diesel Day Tanks
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.
OPLHC/OPLHACS
Series Swichgage instruments
Oil Storage Tanks
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.
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
OPLH-94122B page 1 of 4
Dimensions
Surface / Panel Mount Enclosure (Square Case)
8-7/16 in.
(214 mm)
3-3/8 in.
(86 mm)
3-15/16 in.
(100 mm)
1/2 NPT
conduit
NOTE:
Panel mount
4-1/32 in.
(102 mm)
square case models
do not include
mounting flange and
include bolt circle
shown in Panel Mount
Enclosure versions
(see below).
Mounting Holes
9/32 in. (7 mm)
diameter 3 places.
Not available on
panel mount
square case.
Process Connection
1/4 NPT male on
7-7/8 in.
(200 mm)
bourdon tube models
and 1/4 NPT female
on bellows models.
Surface
Panel Mount Enclosure
(Round Case)
Explosion-proof Enclosure (“EX” Option)
3/8-16 UNC-2B
8 in.
7/8 in. (22 mm)
deep, 4 places.
(203 mm)
2-57/64 in.
5-7/16 in.
(138 mm)
6-3/4 in.
(171 mm)
6-25/64 in.
(162 mm)
(73 mm)
1/2 NPT
optional
rear or side
conduit
8 in.
(203 mm)
1/4 in. (6 mm) dia.
holes (3 places.)
on 5-13/64 in.
(132 mm) b.c.
(bolt circle),120
apart, clocking
as shown
120
120
6-3/4 in.
(171 mm)
120
Mounting Hole
Panel
4-3/4 in. (121 mm)
diameter.
Rear mounting holes
for surface mounting
3/8-16 UNC-2B
Removable lid
Mounting Hole
Process Connection
1/4 NPT Male.
to access adjustable
contact knobs.
7-35/64 in. (192 mm)
7/8 in. (22 mm)
diameter. Not required
for surface mounting.
deep, 4 places.
Process Connection
1/4 NPT Female
Typical Applications
Above Ground Tank
Below Ground Tank
Pressure
regulator
Flow regulator
(recommended)
Tank
SWICHGAGE®
Air compressor
®
Pressure
regulator
SWICHGAGE
Air compressor
Head
Pressure
Ground surface
Flow regulator
(recommended)
Underground tank
(vented)
Direct and Remote Tank
Tank
1 foot
Direct Mount
®
SWICHGAGE
Remote
SWICHGAGE
®
with Sensing Line
Underground
OPLH-94122B page 3 of 4
Internal Wiring
OPLHBP, and
OPLHC, OPLHACS,
and OPLHAFP
Series
OPLHCE, OPLHFC,
OPLHABPS Series
OPLHACES and OPLHAFCS
Series
YELLOW
3
RESET
SET
BLUE
1
4
COMMON
7
4
3
9
5
BROWN
6
8
B
WHITE
1
NEUTRAL
A
120 VAC
= 18 GA.
RED
= 16 GA.
LOW
(RESET)
Black
Red White
Red White Black
HIGH
(SET)
6
BLACK
2
LINE
Contact Ratings: SPDT center off;
2 A, 30 VDC, 1 A, 125 VAC pilot duty.
Contact Ratings: SPDT dry relay contacts,
10 A, 125 VAC.
How to Order
Specify model number. NOTE: No designator is required for Standard configurations.
Also, list options in alphabetical order (A to Z). Place a dash (–) between each option. See example below.
OPLHBP – – 2 – 30 – TA
Options (see Specifications on page 2
for availability)
ES = Environmentally sealed
EX = Explosion-proof
Base Part Numbers
OPLHG
OPLHFC
EL = (EXLC) Explosion-proof less case
LC = Less case
OPLHGE
OPLHC
OPLHCE
OPLHABPGS
OPLHBPE
TA = (TCA) Tickler contact
OPLHBP
OPLHAGS
OPLHACS
OPLHABPS
OPLHAFCS
OPLHAFGS
OPLHFG
OPLHAGES
OPLHACES
Range/Scale (specify in feet)*
45LHE
Bellows
Tube
45LHEF
45LHEBP
05 = 0-5 ft.
X
X
X
X
10 = 0-10 ft.
20 = 0-20 ft.
30 = 0-30 ft.
60 = 0-60 ft.
120 = 0-120 ft.
X
X
X
X
Latching Control Relay Voltage
(applies to “BP” models only)
Blank = 120 VAC
2 = 12 VDC
Bourdon Tube/Bellows
OPLHC Standard=Bronze/Brass
OPLHACS Standard=316 Stainless Steel
*Standard calibration is for water–specify
for other.
4 = 24 VDC
Tamperproof Contact Accessory
Order 05000610
Knob
Lock
Limit
Switch
Knobs
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our
specifications and designs at any time. MURPHY, the Murphy logo, Swichgage® and Murphygage® are registered
and/or common law trademarks of Murphy Industries, Inc. This document, including textual matter and illustra-
tions, is copyright protected by Murphy Industries, Inc., with all rights reserved. (c) 2006 Murphy Industries, Inc.
www.fwmurphy.com
9 1 8 .3 1 7 .4 1 0 0 Email: sales@fwmurphy.com
OPLH-94122B page 4 of 4
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