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.

 
  • Oil Level Meter
    • Measuring Range: 0–1,000mm (customizable)
    • Accuracy: ±2.5% F.S.
    • Operating Temperature: -40°C to +70°C
    • Protection Rating: IP67
    • Material: Stainless steel 304/316L
    • Output: Analog 4–20mA +...
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  • Oil Indicator Gauge
    • Measuring Range: Customizable
    • Operating Temperature: -40℃ ~ +100℃
    • Protection Class: IP65
    • Alarm Contact (Optional): 5A 250V AC
    • Mounting Type: Flange / Threaded
    • Compliance: IEC &...
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  • Magnetic Oil Level Indicator
    • Measuring Range: Customizable
    • Working Temperature: -40℃ ~ +100℃
    • Protection Class: IP65
    • Contact Capacity (Optional): 5A 250V AC
    • Mounting: Flange / Threaded
    • Standards: IEC, DIN...
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  • Magnetic Oil Level Gauge for Transformer
    • Measuring Range: Customizable according to transformer conservator tank size
    • Working Temperature: -40℃~+100℃
    • Ambient Humidity: ≤90% (25℃)
    • Contact Rating (Optional): 5A/250V AC
    • Mounting Type:...
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Product Types and Working Principle
 
01/

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.

02/

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.

03/

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.

04/

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.

 

Magnetic Oil Level Indicator

 

Key Features

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

 

 

Applications

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

Magnetic Oil Level Indicator

 

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.

 

FAQ

 

Q: What causes polyamide sight tubes to turn yellow or crack in the field, and how do these units prevent this?

A: Prolonged exposure to ultraviolet radiation and incompatible synthetic lubricants (such as phosphate esters or certain PAG oils) causes standard plastics to degrade. Using stabilized, high-grade polyamide or heavy-wall borosilicate glass paired with chemically inert Viton seals resists thermal and chemical embrittlement.

Q: What is the maximum operating temperature for standard NBR-sealed indicators?

A: Standard NBR seals maintain structural integrity and elasticity up to 100°C. For continuous operating environments exceeding 100°C, specify Viton (FKM) seals, which tolerate temperatures up to 200°C.

Q: Can these level indicators withstand high-vibration environments like industrial stone crushers or large gearboxes?

A: Yes. Columnar indicators exceeding 254 mm (10 inches) in center distance include an integrated upper support bracket or tie-rod stabilization kit to dampen resonant vibrations and prevent banjo bolt shear.

Q: Are electrical float switches compatible with both PLC and relay control panels?

A: Yes. Standard electrical switches utilize dry reed contacts (SPST or SPDT) capable of interfacing directly with PLC digital input cards, telemetry units, or external relay control circuits operating within 24V to 240V limits.

Q: What documentation is provided for OEM batch orders to verify material compliance?

A: Each shipment includes a Certificate of Conformance (CoC), material test reports (MTRs) for metal components, and dimensional inspection reports upon request.

Q: What is the standard lead time for custom center-to-center lengths and non-standard thread connections?

A: Prototyping for custom configurations typically requires 7 to 10 business days. Standard production batch fulfillment ranges from 15 to 25 business days depending on raw material availability and surface finishing requirements.

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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