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Magnetic Level Gauge

Price range: $ 678.00 through $ 2,841.00

Magnetic Level Gauges
Magnetic Level Gauges offer safe and reliable visual level indication without glass. A magnetic float inside a sealed chamber drives an external indicator with high-visibility red/white flags. Ideal for high-pressure, high-temperature, and hazardous liquids. No power required for basic operation. Available with switches and transmitters for remote monitoring. Widely used in boilers, chemical tanks, oil & gas separators, and cryogenic applications.
SKU: 12500 Categories: , , Tags: , , , , , , , , , Brand:

Description

Category Detailed Description
Product Overview Magnetic Level Gauges (MLG) are highly reliable visual level indicators that use magnetic coupling to show liquid level externally. They are a safer and more durable alternative to traditional glass sight gauges, especially in high-pressure, high-temperature, and hazardous environments. No power is required for basic visual indication.
Working Principle A sealed float with a strong permanent magnet moves vertically inside a non-magnetic chamber as the liquid level changes. This magnet rotates bi-color flags (red/white) or moves a magnetic follower on the external indicator rail, providing clear, high-visibility level indication from a distance without any glass or direct liquid contact.
Construction & Materials Chamber: Stainless Steel 304/316, Hastelloy C, Monel, Titanium or Alloy 20
Float: Titanium, SS316, Hastelloy with magnetic core
Indicator: Aluminum or Stainless housing with high-contrast red/white flags
Process Connections: ANSI/DIN Flanges or Threaded
Technical Specifications Measuring Length: 300 mm to 6000 mm (custom longer available)
Max Pressure: Up to 300 bar (4350 psi)
Max Temperature: -50°C to +450°C
Accuracy: ±5 mm
Visibility: 180° or 360°
Protection: IP66 / IP67
Available Options High/Low level alarm switches (magnetic reed or proximity)
4-20mA continuous level transmitter (magnetostrictive or reed chain)
Insulation & electric heat tracing
High-pressure designs with Schedule 80/160 chambers
Custom scale in engineering units (%, liters, kg, etc.)
Key Advantages Extremely safe – no glass breakage risk
Zero maintenance for visual indication
Works in boiling, foaming, and turbulent liquids
Clear visibility even in poor lighting conditions
Long service life in corrosive and high-pressure applications
Common Applications Boilers and steam drums, Chemical storage tanks, Oil & fuel day tanks, Cryogenic vessels (LNG, LOX), High-pressure separators, Pharmaceutical and food-grade tanks, Acid and caustic storage
Compliance & Certifications ASME B31.3, PED 2014/68/EU, ATEX/IECEx for hazardous areas, SIL 2/3 capable when equipped with switches/transmitters

Additional information

Dimensions N/A
Size

1/2", 3/4", 1", 1-1/2", 2", 3", 4"
Connection Ends

Threaded (MNPT), Flanged (Class150), Tri-Clamp (Sanitary)
Length

6", 12", 24", 36", 48", 60", >84"
Display

No, Yes
Power

24VDC

Specifications

Parameter Specification
Measuring Range 250 mm to 6000 mm (10″ to 20 ft)
Over 4 meters can be supplied in segments
Installation Method Side-mounted • Top-mounted
Medium Temperature PP / UPVC: 0 ~ 50°C
Stainless Steel: -40 ~ 380°C
Body Material 304 Stainless Steel • 316L Stainless Steel • PP • UPVC • Stainless Steel lined with PTFE
Pressure Class 1.0 MPa • 1.6 MPa • 2.5 MPa • 4.0 MPa • 6.3 MPa • 10 MPa • 16 MPa
Installation Flange 1/2″, 3/4″, 1″, 1-1/2″, 2″
DN20 / DN25 / DN80 (PN10 / PN16)
Medium Density ≥ 0.7 g/cm³ (Side-mounted)
≥ 0.8 g/cm³ (Top-mounted)
Remote Transmission 4-20 mA • 4-20 mA + HART
Accuracy ±10 mm

Model Selection

Code Description Category
HL-UHZ Magnetic Level Gauge Series Model Series
25 Side-mounted Measurement Type
26 Bottom-mounted Measurement Type
27 Top-mounted Measurement Type
28 Side + Top-mounted Measurement Type
29 Side + Bottom-mounted Measurement Type
1 Double-sided panel Display Mode
2 Single-sided panel Display Mode
3 Single band luminous type Display Mode
4 LED display type Display Mode
LB Normal bundled remote transmission (4-20mA) Remote Transmitter
GLB High-temperature bundled remote transmission (4-20mA) Remote Transmitter

Code Description Category
O Normal type Explosion-proof Class
G Flameproof type Explosion-proof Class
XM6 Equipped with remote transmission digital display meter Remote Display

Installation

Step Detailed Installation Procedure
Pre-Installation Check Verify model code matches specification. Check chamber for damage. Ensure float moves freely inside the chamber. Confirm flange rating and material compatibility with process.
Safety Precautions Isolate and depressurize the vessel. Use proper PPE. Follow lock-out/tag-out procedures. Ensure area is free of hazardous gases.
Mounting Position Install vertically on the vessel. Side-mounted: align with process connections. Top-mounted: ensure sufficient clearance above vessel. Use stilling well in turbulent applications.
Flange Connection Use appropriate gaskets. Tighten bolts in criss-cross pattern. Torque to manufacturer’s specification. Avoid over-tightening to prevent chamber distortion.
Indicator Assembly Mount the magnetic indicator rail on the chamber using supplied brackets. Align red/white flags. Adjust so “zero” matches vessel empty level.
Remote Transmitter / Switches Install magnetostrictive or reed-chain transmitter on the chamber. Connect wiring per diagram. Calibrate 4-20mA output. Set alarm switches at desired levels.
Final Verification Slowly fill vessel and check indicator follows level accurately. Verify transmitter output and alarm functions. Secure all cables and brackets.
Important Notes Never weld near the chamber. Keep strong magnets away from the unit. For insulated vessels, use extension brackets for indicator.

Maintenance

Activity Maintenance Procedure
Routine Visual Inspection Check indicator flags for smooth operation. Inspect chamber and flanges for leaks or corrosion. Ensure indicator rail is securely mounted and aligned.
Cleaning the Chamber Isolate and drain the gauge. Remove float if necessary. Clean internal chamber and float with appropriate solvent. Remove any scale or deposits from float and chamber walls.
Indicator Maintenance Clean the indicator rail and flags. Verify magnetic coupling is strong. Replace any damaged or faded flags. Lubricate moving parts if required.
Transmitter & Switches Test 4-20mA output signal. Verify alarm switch operation. Check wiring connections and enclosure seals. Calibrate transmitter annually or as needed.
Float Inspection Remove and inspect float for damage or liquid ingress. Check magnet strength. Replace float if weight has changed or if it no longer moves freely.
Pressure & Temperature Check Verify operating conditions are within gauge limits. Check for insulation damage on high-temperature models.
General Recommendations Perform visual checks monthly. Full service every 6–12 months depending on process conditions. Keep spare floats and gaskets in stock.

Advantages / Disadvantages

Category Advantages Disadvantages
Safety & Reliability ✔ No glass – virtually unbreakable
✔ Excellent for high pressure & temperature
✔ Works in hazardous & corrosive media		 ✘ Float can get stuck if debris is present
✘ Requires periodic cleaning in dirty fluids
Visibility & Operation ✔ Clear visual indication from long distance
✔ No power needed for basic operation
✔ Low maintenance for visual reading		 ✘ Indicator can freeze in very low temperatures
✘ Limited resolution compared to digital
Cost & Installation ✔ Lower long-term cost than many electronic types
✔ Easy to install and retrofit		 ✘ Higher initial cost than simple sight glasses
✘ Heavy and bulky on large vessels

Q&A

Question Answer
How does a Magnetic Level Gauge work? A magnetic float inside a sealed chamber rises and falls with the liquid level. The float’s magnet rotates external red/white flags or moves a follower, giving clear visual indication without glass or power.
What are the main advantages over glass sight gauges? Much safer (no glass breakage risk), suitable for higher pressure and temperature, and virtually maintenance-free for visual reading.
Can it be used in high-pressure applications? Yes. Magnetic Level Gauges can handle pressures up to 300 bar depending on the model and material.
Is it suitable for corrosive liquids? Yes. Available in 316L, Hastelloy, Titanium, and PTFE-lined versions for aggressive chemicals.
Do I need power for the gauge to work? No power is needed for basic visual indication. Power is only required if you add a 4-20mA transmitter or alarm switches.
What is the accuracy of the gauge? Typical visual accuracy is ±5 mm to ±10 mm.
How often should maintenance be performed? Visual inspection monthly. Full cleaning and float check every 6–12 months depending on process conditions.
Can I add remote monitoring? Yes. Magnetostrictive transmitters or reed chain systems can provide 4-20mA output and digital display.
What is the maximum length available? Standard single chamber up to 6 meters. Longer distances can be achieved with multiple segmented sections.

Applications

Industry Typical Applications Key Benefits
Power Generation Boiler drums, steam drums, feedwater tanks, condensate receivers High pressure & temperature resistance, clear visibility
Oil & Gas Crude oil tanks, separators, fuel storage, flare knockout drums Safe for hazardous areas, handles viscous & foaming liquids
Chemical Processing Acid, caustic, solvent, and reactor storage tanks Corrosion-resistant materials available
Petrochemical & Refinery Distillation columns, surge drums, product storage High reliability in harsh environments
Pharmaceutical & Food Pure water tanks, ingredient storage, hygienic vessels Sanitary designs with 316L and electropolished finishes
Cryogenic & LNG Liquid nitrogen, oxygen, LNG storage tanks Special low-temperature construction available
Marine & Offshore Ballast tanks, fuel bunkers, cargo monitoring on ships & platforms Robust construction for harsh marine conditions

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