4-1/2 Inch Dial Level Gauges
The OPLHC/OPLHACS Series Level gauges are combination level-indicating gauges with adjustable low- and high-limit switches. Limit switches can be wired directly to electric pilot circuits to operate alarms, shut down or start/stop pumps to maintain predetermined levels.
- Eliminates under/overfill due to human error
- Combination level-indicating gauge and critical level limit switch
- High- and low-level limit contacts are visible and adjustable
- Latching control relay versions available
- Indication only models available
Surface-mount or panel-mount enclosures are 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 the front of the gauge.
Specialized models are available for specific applications involving engines or electric motors.
OPLHC/OPLHACS Series include two adjustable, pilot duty, pointer type contacts. Contacts have self-cleaning motion to enhance electrical continuity. Models are available with a rugged bourdon tube or a 316 stainless steel bellows sensing element for greater accuracy and sensitivity in lower ranges.
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 models (OPLHAGS).
Model OPLHC
- Enclosure Type (die cast aluminum):
- Surface mount, square case
- Surface mount, square case
- Limit Switch Ratings:
- Pointer contacts: SPDT center off; 2 A, 30 VDC, 1 A, 125 VAC
- Pointer contacts: SPDT center off; 2 A, 30 VDC, 1 A, 125 VAC
- Sensing Element:
- Bourdon tube, bronze/brass (standard)
- Bourdon tube, 316 SS (optional)
- Bourdon tube, bronze/brass (standard)
- Process Connections: 1/4 NPT Male
- Geared Movement: 300 series stainless steel
- Accuracy (standard calibration is for water):
- ± 2% first/last quarters of scale, 1% middle half of scale
- ± 2% first/last quarters of scale, 1% middle half of scale
- Options Available (specify when ordering):
- Explosion-proof case; Class I, Div. I, Groups C & D (EX)
- Explosion-proof less case; internal gauge mechanism without case (EL)
- Less case; internal gauge mechanism without case (LC)
- Explosion-proof case; Class I, Div. I, Groups C & D (EX)
- Ranges Available (specify when ordering):
- 0-20 ft. (0-6 m) dual scale dial
- 0-30 ft. (0-9 m) dual scale dial
- 0-20 ft. (0-6 m) dual scale dial
Model OPLHFC
- Enclosure Type (die cast aluminum):
- Panel mount, round case
- Limit Switch Ratings:
- Pointer Contacts: SPDT center off; 2 A, 30 VDC, 1 A, 125 VAC
- Sensing Element:
- Bourdon tube, bronze/brass (standard)
- Process Connections: 1/4 NPT Male
- Geared Movement: 300 series stainless steel
- Accuracy (standard calibration is for water):
- ± 2% first/last quarters of scale, 1% middle half of scale
- Options Available (specify when ordering):
- Environment sealed for isolation from elements (ES)
- Less case; internal gauge mechanism without case (LC)
- Environment sealed for isolation from elements (ES)
- Ranges Available (specify when ordering):
- 0-20 ft. (0-6 m) dual scale dial
- 0-30 ft. (0-9 m) dual scale dial
Model OPLHACS
- Enclosure Type (die cast aluminum):
- Surface mount, square case
- Limit Switch Ratings:
- Pointer Contacts: SPDT center off; 2 A, 30 VDC, 1 A, 125 VAC
- Sensing Element:
- Bellows, 316 Stainless Steel (standard)
- Process Connections: 1/4 NPT female
- Geared Movement: 300 series stainless steel
- Accuracy (standard calibration is for water):
- ± 2% first/last quarters of scale, 1% middle half of scale
- Options Available (specify when ordering):
- Explosion-proof case; Class I, Div. I, Groups C & D (EX)
- Explosion-proof less case; internal gauge mechanism without case (EL)
- Less case; internal gauge 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
Model OPLHBP
- Enclosure Type (die cast aluminum):
- Surface 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)
- Process Connections: 1/4 NPT Male
- Geared Movement: 300 series stainless steel
- Accuracy (standard calibration is for water):
- ± 2% first/last quarters of scale, 1% middle half of scale
- Options Available (specify when ordering):
- Explosion-proof case; Class I, Div. I, Groups C & D (EX)
- Explosion-proof less case; internal gauge mechanism without case (EL)
- Less case; internal gauge mechanism without case (LC)
- Ranges Available (specify when ordering):
- 0-20 ft. (0-6 m) dual scale dial
- 0-30 ft. (0-9 m) dual scale dial
Notes (all models)
- 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 the correct range (dial scale).
- For elevated tanks, subtract the tank elevation from gauge reading to determine actual tank level.
Dimensions Wall Mount (Square Case)
Dimensions Flush Mount (Round Case)
Dimensions Explosion-Proof Enclosure (EX Option)
Electrical Diagram OPLHC and OPLHACS
Electrical Diagram BP Versions
For more information about this product, you can download the related literature here:
Sales Bulletin (94122; revision date – 10/2023)
Installation Instructions (00-02-0178; revision date – 08/2021)