FW Murphy OPLC Installation And Operation Instruction

Pressure Gage Instruments 4-1/2 in. (114 mm) Dial
Installation and Operation Instructions
Models: OPLC, OPLFC, OPLBP, OPLFG, 45APE and 45APEF
Please read the following instructions before installing. A visual inspection of this product for damage during
shipping is recommended before mounting. It is your responsibility to have a qualified person install the unit.
OPLC and OPLFC gage instruments have high and low
limit contacts to monitor, alarm or shut down. The OPLC
has a flanged case. A method to override the low limit
contact for start-up is provided on OPLC models. See
Operation Test Instructions. OPLFC can be direct or panel
mounted.
OPLFG gage indication-only pressure instrument is similar
to OPLFC models, without switch (limit) contacts.
OPLBP is a version of the OPLC featuring pilot duty limit
switches connected to an internal latching control relay for
on/off control directly or through a motor starter.
-OS and -ES options include oil sealed and environment
sealed case for corrosive environment, feature a panel
mount case or screw directly into the process.
45APE and 45APEF are versions of the OPLC Series
featuring 2 snap -acting SPDT switches instead of the
pointer type contacts. These units do not include low
contact lockout.
Specifications
Dial: White on black, dual scale, psi/kPa standard, 4-1 /2 in. (114 mm)
diameter
Case: Die cast aluminum, surface or panel mount
Process Connection:
1/4 NPTM to 1000 psi; 1/2 NPTM 1500-10,000 psi.
Sensing Element: Bronze or 316 stainless steel bourdon tube
Snap-Acting Switches: See wiring information (45APE/45APEF)
Overrange: Do not exceed 10% FS above full range
Pressure Relief Disc: Back of case
Dry Relay Contact: OPLBP, 10 A@ 120 VAC
Wire Connections (Surface Mount): 1/2 NPTF conduit entry with
terminal block
Wire Connections (Panel Mount):
Wire leads, 18 AWG (1.0 mm
2
Wire Connections (-ES, -OS): 1/2 NPTM conduit and wire leads,
OPLFC Series: 18 AWG (1.0 mm
Switch Point Accuracy: ± 1.5% (45APE/45APEF)
Switch Reset Deadband: Approximately 10% FS (45APE/45APEF)
Before Beginning Installation of this Product:
1.) Disconnect all electrical power to the machine.
2.) Make sure the machine cannot operate during installation.
3.) Follow all safety warnings of the machine manufacturer.
4.) Read and follow all installation instructions.
) x 9 in. (229 mm) long
) x 33 in. (838 mm) long
2
Installation Precautions:
• Do NOT exceed rated pressure range.
• Dope or use teflon tape on connection threads.
• Do not block the inlet orifice.
• For direct mount into the process, a vertical or
ninety degree mounting is recommended.
• Use wrench on shank to tighten or loosen
connection.
• Do not twist case when installing, this will
damage internal components and will void the
warranty.
• Do not overtighten.
• Use shock mounts as necessary to prevent
excessive vibration.
• If liquid in the system freezes, it will expand and
will damage the tube.
• For 45APE Series - Low setpoint should be lim-
ited to the lower 1/2 scale and upper setpoint
should be limited to the upper 1 /2 scale.
Gage Accuracy:
All models between switch points:
± 2% for first and last quarters of
scale; middle half of scale is ± 1 %
Based on testing performed with switch point
at mid scale which represents worst case.
1
sect. 05
00-02-0161
rev. 2024/04/24
45APE/45APEF Accuracy Outside Switch Points
Accuracy Above or Below Trip Point
Range
10
<100
100-300 4
400-1500 2
2000 12
3000-5000 8