Murphy Switch OPLH User Manual

OPLH-94122B  
Revised 03-06  
4-1/2 in. (114 mm) Dial  
Catalog Section 15  
Level Swichgage® instrument  
OPLH / OPLHACS Series  
R
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  
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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