Product Overview
Industrial oil level indicators provide continuous visual and electrical fluid monitoring for enclosed gearboxes, hydraulic power units, industrial compressors, and power transformers. Built to withstand continuous mechanical vibration and aggressive thermal cycles, these units prevent catastrophic equipment failure caused by lubricant starvation.
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Oil Level Meter• Measuring Range: 0–1,000mm (customizable)view more
• Accuracy: ±2.5% F.S.
• Operating Temperature: -40°C to +70°C
• Protection Rating: IP67
• Material: Stainless steel 304/316L
• Output: Analog 4–20mA +... -
Oil Indicator Gauge• Measuring Range: Customizableview more
• Operating Temperature: -40℃ ~ +100℃
• Protection Class: IP65
• Alarm Contact (Optional): 5A 250V AC
• Mounting Type: Flange / Threaded
• Compliance: IEC &... -
Magnetic Oil Level Indicator• Measuring Range: Customizableview more
• Working Temperature: -40℃ ~ +100℃
• Protection Class: IP65
• Contact Capacity (Optional): 5A 250V AC
• Mounting: Flange / Threaded
• Standards: IEC, DIN... -
Magnetic Oil Level Gauge for Transformer• Measuring Range: Customizable according to transformer conservator tank sizeview more
• Working Temperature: -40℃~+100℃
• Ambient Humidity: ≤90% (25℃)
• Contact Rating (Optional): 5A/250V AC
• Mounting Type:...
Product Types and Working Principle
Columnar Level Gauges: Utilize an external bypass tube connected via hollow banjo bolts. Fluid rises inside a transparent polyamide or borosilicate glass tube, referenced against a calibrated aluminum scale plate.
Visual Sight Glasses: Direct-view bullseye and threaded lenses featuring a reflective float ball or stark background line for immediate fluid verification in compact gearcases.
Electrical Level Switches: Integrated reed-switch or hall-effect floats that trigger digital alarms or programmable logic controller (PLC) signals when fluid drops below operational thresholds.
Materials of Construction: Machined 6061-T6 aluminum or 304/316 stainless steel bodies, transparent Polyamide (PA) or tempered glass tubes, and NBR, Viton (FKM), or PTFE sealing elements.

Bar-stock metal bodies eliminate casting porosity and handle operating pressures up to 2.0 MPa depending on the configuration.
Sealing compounds matched strictly to fluid chemistry: Viton for synthetic ester and phosphate ester lubricants; NBR for standard mineral oils up to 100°C.
Integrated bi-metallic thermometers available with dual Celsius/Fahrenheit dial faces (0°C to 100°C / 32°F to 212°F).
Hollow banjo bolts utilize precision-rolled threads conforming to ISO 228 (BSP) or ANSI B1.20.1 (NPT) standards.
Technical Specifications
| Operating Pressure | 0.1 MPa to 2.0 MPa |
| Operating Temperature | -30°C to +120°C (Polyamide tube limit); up to +200°C (Glass tube with Viton seals) |
| Port Sizes | M10 through M27, 1/4 inch to 1 inch NPT/BSP |
| Body Materials | Aluminum alloy, Brass (CuZn39Pb3), Stainless Steel (AISI 304 / 316) |
| Seal Compounds | NBR (Standard), Viton (Chemical-resistant), EPDM (Glycol-based fluids) |
| Electrical Ratings | Max switching voltage 240VAC/DC, max current 0.5A, SPST / SPDT configuration |
Planetary and helical industrial gearboxes
Hydraulic power units (HPU) for industrial stamping presses
Rotary screw and centrifugal air compressors
Industrial diesel engine crankcases and fuel storage tanks
Medium-to-high voltage power distribution transformers

Manufacturing and Quality Control Standards
Machining Tolerances
Thread tolerance classes maintained within ISO 6g/6H on multi-axis CNC turning centers.
Pressure Testing
100 percent pneumatic pressure testing performed underwater at 1.5x working pressure for 30 seconds.
Material Traceability
Mill test certificates maintained in accordance with EN 10204 3.1 for all metal batch lots.
Documentation Compliance
Certificate of Conformance (CoC), Material Test Reports (MTRs), and dimensional inspection reports supplied upon request.
Customization Options
Custom center-to-center mounting lengths ranging from 50 mm to 2000 mm for columnar gauges.
Laser-engraved custom scale graduations, corporate logos, or specific minimum and maximum fluid level warning zones.
Non-standard thread pitches, metric-to-inch adapters, and specialized chemical-resistant fluoroelastomer seals.
Hebei Anmei Electrical Equipment Co., Ltd. is one of the most professional oil level indicator manufacturers and suppliers in China, specialized in providing high quality products and service. Please feel free to buy customized oil level indicator made in China here from our factory. Contact us for quotation.
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