Magnetic Level Gauge With Alarm Switch

Ordinary standard magnetic level gauges only provide on-site visual liquid level indication, incapable of automatic early warning when liquid level overflows or drains empty. Operators must conduct regular manual inspections, which easily causes tank overflow, pump dry running, empty tank shutdown and other safety accidents, bringing material loss and production risks.

Our Magnetic Level Gauge with Alarm Switch upgrades standard side-mounted magnetic level gauge by adding external alarm switch assembly based on the original communicating vessel measurement principle. It retains all advantages of traditional magnetic level gauges such as stable measurement, wide pressure-temperature range and multi-alloy corrosion resistance, while adding liquid level threshold alarm function. Users can set any number of alarm positions freely according to production techniques, achieving automatic sound-light alarm or interlock control of feeding pumps, drain valves and cut-off valves when liquid level reaches preset height.

Different from the reed switch version which focuses on introducing internal reed component principles for automation integration, this alarm switch version centers on production safety warning and tank protection pain points, serving factories that require liquid level limit safety interlock. The alarm switch adopts non-contact magnetic induction structure, no mechanical contact abrasion, matches high-temperature, high-pressure and corrosive working conditions, and can cooperate with transmitters to realize local display + remote transmission + limit alarm all-in-one function, perfectly solving hidden dangers of unattended tank area operation.

• Dual Function: Local Visual Display + Liquid Level Limit Alarm Protection Keep intuitive bi-color flap on-site level reading; add alarm switches to trigger signal output once liquid level hits upper/lower limit, prevent tank overflow, pump idling and empty-tank accidents.
• Customizable Alarm Points Layout Install 1~multiple groups of alarm switches arbitrarily along the measuring stroke, realize high-level overflow alarm, low-level empty protection, intermediate material level interlock according to process requirements.
• Contact-Free Magnetic Induction Alarm Structure The alarm switch senses float magnet signal without touching the medium inside the chamber, zero mechanical wear, long service life, stable performance under vibration and high temperature environments.
• Full Alloy Corrosion-Resistant Matching System Chamber, flange and float optional 304SS, 316L, Titanium, Hastelloy C276, Inconel 625, 310S, adapt to neutral, acidic, alkaline and high-temperature industrial media.
• Two Types of Indicating Flaps for Full Temperature Coverage Nylon-coated aluminum flaps withstand up to 150°C for normal-temperature tanks; all-metal flaps support 400°C high-temperature working conditions for heating reaction vessels.
• Ultra-wide Pressure & Temperature Operating Envelope Work stably from vacuum to 16MPa (Class 900), maximum design pressure 32MPa @ 100℃; medium temperature range −40℃ ~ 400℃, cover cryogenic storage, normal production and high-temperature thermal processes.
• Flexible Installation & Complete Expansion Capacity Support flange, welding, threaded installation modes; reserve mounting positions for magnetic transmitters, magnetostrictive transmitters, realize local alarm + remote DCS signal transmission simultaneously.
• Easy On-site Calibration & Maintenance Alarm switch positions can be adjusted freely on the guide rail without stopping production; standard 1/2" internal thread drain valve facilitates regular chamber cleaning and maintenance.

This alarm-type magnetic level gauge inherits the full working condition adaptability of standard magnetic level gauges, and adds adjustable alarm modules for liquid level safety interlock control. All material configurations and pressure-resistant structures can be matched according to medium characteristics, complete parameters are listed in the table below:

This magnetic level gauge with alarm switches is mainly used for various storage tanks and reaction kettles needing liquid level safety early warning and automatic interlock control, widely deployed across industrial sectors:

• Petrochemical Raw Material Storage Area Oil tank, solvent tank high-level overflow alarm and low-level pump dry-run protection, avoid raw material leakage and pump burnout accidents.
• Chemical Reaction Kettle System Interlock feeding and discharging valves via intermediate liquid level alarm signals, realize automatic batching production.
• Power Plant Auxiliary Water Tanks Condensate tank, demineralized water tank high/low liquid level alarm, guarantee stable operation of boiler water supply system.
• Water Treatment Sedimentation & Purification Tanks Liquid level alarm for sewage buffer tank and clean water tank, automatically start/stop lifting pumps.
• Metallurgy & Light Industry Storage Vessels Cooling liquid tanks, industrial raw material storage tanks, realize unattended safety monitoring of tank areas.

Q1: What is the difference between this Magnetic Level Gauge with Alarm Switch and Magnetic Level Gauge with Reed Switch?

A: The two adopt identical dry reed switch components internally, but differ in market positioning and selling logic. This alarm switch version focuses on production safety scenarios such as overflow prevention and empty tank protection, oriented to users who need liquid level alarm interlock; the reed switch version takes internal reed element as the core introduction point, focuses on signal transmission characteristics, more suitable for automation system integrators to select matching components.

Q2: How many alarm switches can be installed on one level gauge at most?

A: There is no fixed quantity limit, we can install 2 points (high/low limit) conventionally, or 3~5 groups of alarm switches according to your technological interlock demands, and each alarm position can be adjusted on-site later.

Q3: Is the alarm switch signal passive contact output? Can it directly connect to audible and visual alarms?

A: The alarm switch outputs passive contact signals, which can be directly connected to sound-light alarms, relays or PLC modules to complete alarm reminder and equipment interlock control without additional power supply.

Q4: Can the alarm part still work normally under high temperature 300℃ working conditions?

A: Equipped with high-temperature resistant reed switches and all-metal indicator assembly, the alarm system can operate stably within −40℃~300℃; special high-temperature working conditions can use isolated external alarm structure.

Q5: Can I add alarm switches to existing ordinary magnetic level gauges later?

A: If your original magnetic level gauge has reserved guide rail space for installing switches, we can supply separate alarm switch accessories for retrofitting; non-reserved structure needs to replace the guide rail assembly.

Q6: Will corrosive media affect the service life of the alarm switch?

A: The alarm switch is installed outside the measuring chamber and completely isolated from internal medium, medium corrosion cannot touch the switch component, so corrosion of tank liquid will not damage the alarm structure.

Unattended tank operation often faces safety hazards such as overflow leakage and pump dry running caused by abnormal liquid level. Our magnetic level gauge with alarm switch retains reliable local liquid level display while adding customizable limit alarm interlock function, which can automatically cut off the feed pump or trigger an alarm once the liquid level is abnormal, greatly reducing safety risks and manual inspection costs. Our engineers will configure the number of alarm points, alarm installation positions and matched alloy materials according to your medium temperature, pressure, corrosiveness and interlock logic requirements. Submit your working condition parameters now to obtain a customized liquid level measurement & safety alarm solution and factory quotation.

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