Murphy OPLHACS, OPLH User Manual
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 available 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 bellows (depending on which model you have).
The bourdon tube/bellows operates 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
OPLH-94122B page 2 of 4
Specifications
Shipping Dimensions
Item Dimensions: 16 x 11 x 5-1/2 in. (406 x 279 x 140 mm).
Explosion-proof models:
12 x 12 x 9 in. (305 x 305 x 229 mm).
Shipping Weights
Item Weight: 8 lb. (3.6 kg) approximately.
Explosion-proof models: 22 lb. (10 kg) approximately.
OPLHFC
OPLHCE
OPLHC
Enclosure Type (die cast aluminum)
• Surface mount, square case
• Panel mount, round case
• Panel mount, square case
Limit Switch Ratings
• Pointer Contacts:
SPDT center off; 2 A, 30 VDC, 1 A, 125 VAC.
Latching Control Relay
• SPDT,10 A @ 120 VAC (standard)
• DPDT, 12 VDC (Optional)
• DPDT, 24 VAC (Optional)
• DPDT, 24 VDC (Optional)
Sensing Element
• Bourdon Tube, Bronze/Brass (standard)
• Bellows, 316 Stainless Steel (standard)
Process Connections
• 1/4 NPT Male
• 1/4 NPT Female
• 2 NPT Male
Geared Movement: 300 series stainless steel.
Accuracy (standard calibration is for water)
• ±2% first/last quarters of scale, 1% middle half scale.
(1)
• 3% full scale.
OPTIONS AVAILABLE (specify when ordering)
• Environment sealed for isolation from the elements (ES).
(2)
• Explosion-proof case; Class I, Div. 2, Groups C & D (EX)
• Explosion-proof less case; internal gage
mechanism without case (EL)
• Less case; internal gage mechanism without case (LC)
• Tickler contact (TA)
RANGES AVAILABLE (specify when ordering)
• 0–5 ft. (0–1.5 m) dual scale dial
• 0–10 ft. (0–3 m) dual scale dial
• 0–20 ft. (0–6 m) dual scale dial
• 0–30 ft. (0–9 m) dual scale dial
• 0–60 ft. (0–18 m) dual scale dial
• 0–120 ft. single scale dial
• 0–3.6 metres single scale dial
• 0–4 metres single scale dial
• 0–6 metres single scale dial
• 0–9 metres single scale dial
(1)
Bourdon tube (OPLHC) models in the 20 ft. (6 m) range have an accuracy of 3% full scale.
(2)
ES option available for the 20 ft. (6 m) range models and above.
NOTES:
• Options may not be available in combination. Consult factory.
• Over range is not to exceed 10% FS above full range.
• Calibration is for water. Specify for other liquids.
• Add TOTAL height of liquid above the pressure connection to determine correct range (dial scale).
For elevated tanks substract the tank elevation from gage reading to determine actual tank level.
OPLHACS
OPLH / OPLHA Series
OPLHBP
OPLHACES
OPLHABPS
OPLHBPE
OPLHABPES
OPLHFG
OPLHG
OPLHAGS
OPLHAGES
OPLHAFCS
OPLHAFGS
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