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The OPL-series pressure Swichgage® instruments are combination pressure 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 of engines and electric motors.
Surface mount or panel mount enclosure is available for most versions. All versions feature a 4-1/2 in. (114 mm) dial for easy viewing. Adjustable limit switches are accessible from front of the Swichgage instrument. Limit contacts have self-cleaning motion to enhance electrical continuity.
Other versions available:
OPLC, OPLCE and OPLG
The OPLC is a surface mount, indicating, pressure gage and switch. Adjustable high and low limit, ungrounded contacts are used to operate alarm, shutdown or start-stop circuits. Pointer closure against either of the adjustable contacts completes the pilot-duty circuit.
An SPST toggle switch is provided to override the low limit contact for equipment startup. Suitable for engines or electric motors with appropriate Murphy magnetic switch or trans- former relay assembly.
The OPLCE features a panel mount square case. It has all the features of the OPLC except the low limit contact lockout.
The OPLG is an indicating-only pressure Murphygage instrument. Same as the OPLC except without switch (limit) contacts.
OPLFC and OPLFG
The OPLFC is a panel mounting version of the OPLC. It has all of the features of the OPLC except the low limit contact lockout. The lockout must be done externally through the con- trol circuit or with the optional “SA” lockout. The OPLFC is typically used in control pan- els such as for compressors, pumps, etc. This version can be environmentally sealed with either the “ES” or “OS” options. Contact lead termination is by pigtail wires.
The OPLFG is an indicating-only pressure Murphygage instrument. Same as the OPLFC except without switch (limit) contacts.
OPLBP and OPLBPE
The OPLBP is a specialized version of the OPL series designed for start-stop operation of engines and electric motors. The pilot-duty limit switches are connected to an internal latching control relay for ON/OFF automation. Available for various voltages.
The OPLBPE is the same as the OPLBP except has a panel mount square case.
Case: Die cast aluminum; weatherproof.
Contacts: See Electrical page 3, for contact ratings.
Dial: 4-1/2 in. (114 mm) white on black, dual scaled psi /kPa. Other dial configurations available. Consult factory.
Gage Accuracy: ±2% for the first and last quarters of the scale, the middle half is ±1%.
Geared Movement: 302 and 304 stainless steel.
Lens: Optically clear polycarbonate.
Pointer: High visibility with a pointer calibration hub.
Process Connection: Available in 1/4 NPT and 1/2 NPT. See Table B, page 5.
Sensing Element: Select from bronze or 316 stainless steel bourdon tube.
For more information about this product, you can download the related literature here: