Magnetic Float Level Transmitter

Our magnetic float level transmitter adopts mature resistance-current conversion measurement principle, delivering continuous analog digital level reading instead of simple point switch signals. This series provides graded wetted material configurations including stainless steel, PTFE coated and plastic PP/PVC/PVDF types, covering light oil, clean water, strong acid and alkali corrosive fluids with density ≥0.5g/cm³, and supports liquid-liquid interface detection when medium density difference reaches above 0.2g/cm³.

Supported ultra-fine resolution options (5mm / 10mm / 20mm) and industry-leading ±0.1% full scale measurement precision ensure stable, repeatable continuous level data within the full measuring range from 200mm up to 4000mm. Powered by standard 24VDC, it carries abundant multi-signal output options: 4-20mA+HART, standalone 4-20mA, 1-5VDC, RS485 Modbus and PA protocol, with flexible 2-wire and 4-wire wiring modes to match various PLC, DCS and secondary display instruments.

Three material versions carry tiered pressure and temperature resistance to match distinct process working conditions: stainless steel type withstands up to 5MPa process pressure and 120°C medium temperature for high-pressure chemical and petrochemical vessels; PTFE coated variant balances moderate pressure and anti-corrosion capacity; plastic PP/PVC/PVDF series works under atmospheric pressure, ideal for low-cost corrosive fluid storage tanks. Standard Φ19mm guide tube with optional Φ14mm size, matched with Φ75mm standard float (Φ52mm optional for stainless steel models), supports flange, thread and bracket three installation ways to adapt side-mounted, top-mounted and external bypass tank structures.

Optional dual explosion-proof certifications Ex ia IIC T6 Ga and Ex db IIC T4~T6 Gb enable safe deployment in flammable and explosive hazardous zones. IP protected electrical cavity with M20*1.5, 1/2NPT, 3/4NPT wiring ports maintains stable operation at ambient temperature -30℃ ~ 75℃ (plastic version -30~70℃). Widely applied in petrochemical, fine chemical, water treatment, food & beverage and power industries, this magnetic float level transmitter acts as an economical continuous level measuring solution combining high precision, complete corrosion resistance grades and diversified signal output for tank inventory management and closed-loop process automatic control.

The following table details the full technical parameters of our magnetic float level transmitter, categorized by three wetted material variants: stainless steel, PTFE-coated and PP/PVC/PVDF plastic construction. It covers core measuring performance including resolution, full-scale precision and medium interface detection standards, alongside measuring range, process pressure/temperature limits, multi-format signal outputs, wiring modes, guide tube/float dimensions, installation interfaces, ambient operating range and optional dual explosion-proof certifications. You can reference these graded specs to match your tank pressure, medium corrosivity, control system communication protocol and hazardous zone requirements. Our engineering team also provides customized measuring lengths, special float sizes and tailored configuration schemes upon your project demand.

• Continuous resistance-current conversion measurement, optional 5/10/20mm resolution, ±0.1% FS high precision, supports oil-water interface detection
• Three wetted material options (304/316 stainless steel, PTFE coating, PP/PVC/PVDF plastic) for tiered pressure & corrosion resistance
• Multiple signal outputs: 4-20mA+HART, 4-20mA, 1-5VDC, RS485, PA; 2-wire/4-wire wiring available
• Measuring range 200–4000mm, flange/thread/bracket mounting, Φ19 standard guide tube & Φ75 standard float
• Wide process pressure (0~5MPa) and temperature range, optional Ex ia / Ex db dual explosion-proof certifications
• Operates steadily at -30℃~75℃ ambient temperature, low wear structure with minimal routine maintenance

This magnetic float level transmitter delivers continuous high-precision liquid level and liquid-liquid interface measurement, with three graded wetted material structures matching different pressure, temperature and corrosive medium conditions. Equipped with multi-protocol signal output and optional dual explosion-proof certification, it serves as a stable long-distance monitoring core device for tank storage and automated process control across major industrial sectors.

Petrochemical & LPG Storage Facilities

The stainless steel model withstanding up to 5MPa pressure fits crude oil, refined oil and fuel storage tank inventory metering. With 5mm ultra-fine resolution, it realizes accurate layered interface tracking inside separation reactors and oil-water sedimentation vessels. Optional flameproof and intrinsically safe explosion-proof certifications fully meet safety standards for liquefied gas tank farms, automatically transmitting real-time level data to central DCS systems for overflow and empty tank protection interlock.

Fine Chemical & Pharmaceutical Production

Three anti-corrosion material options (316L stainless steel, PTFE coating, PP/PVDF plastic) adapt to weak acid, strong alkali and organic solvent storage tanks. It supports stable measurement of reaction kettle intermediate liquid and dosing tank raw material liquid level, linear ±0.1%FS precision avoids measurement deviation affecting pharmaceutical formulation ratios. Multiple communication modes including HART and RS485 simplify access to pharmaceutical clean workshop automation loops.

Food & Beverage Processing Plants

304 stainless steel wetted components comply with food-grade medium contact requirements, applicable to edible oil storage tanks, wine fermentation silos and beverage blending containers. Wear-free reed switch internal structure avoids medium contamination risks, continuous level signal output realizes automatic feeding and liquid filling control, effectively reducing material waste caused by manual misjudgment of liquid height.

Municipal Water & Wastewater Treatment

Medium-pressure stainless steel and atmospheric plastic versions cover clean water storage pools, sewage sedimentation tanks and chemical agent dosing barrels. Its wide ambient temperature adaptability (-30℃~75℃) supports outdoor unattended water treatment cabinet installation, real-time level signals linkage with drainage and dosing pumps to realize fully automatic water balance regulation.

Other General Industrial Scenarios

Power plant boiler condensate tanks, hydraulic station oil storage vessels and environmental protection waste liquid storage containers can all adopt matched material specifications. The flange, thread and bracket three installation modes are compatible with bypass pipe, top-mounted and side-mounted tank structures, solving liquid level monitoring demands of small vertical tanks to large 4-meter deep storage tanks.

Core On-site Functional Application Scenarios

• Continuous full-range liquid level real-time monitoring for tank inventory statistics
• Oil-water two-phase layered interface measurement for mixed medium separation process
• High/low liquid level automatic pump/valve interlock via matched secondary display instrument
• Remote long-distance data transmission through HART, RS485 or PA industrial protocols
• Safe liquid level detection for flammable and explosive medium hazardous zones with explosion-proof certification

All magnetic float level transmitters are manufactured and calibrated strictly in accordance with industrial fluid measurement standards, with full inspection of reed switch linearity, signal conversion accuracy, sealing performance and corrosion resistance before factory delivery, providing multi-dimensional quality assurance for global industrial project procurement.

1.High Precision Measurement Performance Guarantee

Every unit undergoes full-range linear calibration to lock ±0.1%FS overall transmission precision, with optional 5/10/20mm graded resolution to meet high-precision metering and conventional process monitoring separately. The linear resistance circuit structure ensures consistent stable signal output within the full measuring range of 200mm to 4000mm, no data drift after long-term continuous operation.

2.Graded Wetted Material Quality Assurance

Three material series adopt raw materials with verified anti-corrosion and pressure resistance data: stainless steel 304/316L withstands 5MPa high pressure; PTFE coating isolates moderate corrosive media; PP/PVC/PVDF plastic adapts to strong acid-base atmospheric tanks. Each material variant passes medium soaking aging test to guarantee long-term corrosion resistance matching marked temperature and pressure parameters.

3.Circuit & Sealing Safety Guarantee

High-quality reed switches serve as core sensing parts to extend equipment service life; the whole machine adopts fully sealed IP66/IP67 protection structure to resist workshop dust, moisture and water splashing. Built-in short-circuit protection for the signal conversion circuit, optional Ex ia intrinsic safety and Ex db flameproof dual explosion-proof certifications fully compliant with hazardous area safety specifications.

4.Multi-Signal Compatibility Standardization Guarantee

All signal output modules (4-20mA+HART, 4-20mA, 1-5VDC, RS485 Modbus, PA protocol) are solidified and tested in the factory. Both 2-wire and 4-wire wiring modes are stable and distortion-free when connected with mainstream PLC, DCS and light column level indicators on the market, eliminating the need for additional signal converters.

5.Complete Technical After-Sales Support

We provide free model selection guidance according to medium density, tank pressure, corrosivity and control system communication protocol. Complete wiring diagrams, parameter setting manuals and factory test reports are supplied for project acceptance. Custom measuring lengths, special small-size floats and dedicated communication configuration services are available for special working conditions.

Q1: What is the core measurement principle of this magnetic float level transmitter, and how does it differ from ordinary magnetic float switches?

A: This transmitter relies on Archimedes buoyancy and reed switch resistance-current conversion to output continuous linear analog/digital signals, supporting full-range liquid level real-time tracking and remote data transmission. Ordinary magnetic float switches only output simple point on-off alarm signals without continuous value feedback. Smaller reed switch distribution gaps deliver finer resolution (5mm minimum) and higher measurement accuracy for inventory metering.

Q2: What are the differences between stainless steel, PTFE coated and plastic PP/PVC/PVDF three material versions, how to select?

A: ① 304/316L stainless steel: max range 4000mm, withstand 0~5MPa pressure, medium temperature up to 120℃, for high-pressure petrochemical and high-temperature reaction tanks; ② PTFE coated: max 4000mm range, max 2.5MPa pressure, 120℃ medium temperature, moderately anti-corrosive for organic solvent tanks; ③ PP/PVC/PVDF plastic: max 3500mm range, only atmospheric pressure, segmented temperature limit, low-cost choice for strong acid-base normal-pressure storage tanks.

Q3: Can this transmitter measure layered oil-water interface? What are the medium requirements?

A: Yes, it supports liquid-liquid interface monitoring. The density difference between upper and lower media must reach ≥0.2g/cm³ to ensure stable interface identification. The medium density needs to be ≥0.5g/cm³ to drive the float to float normally, and we can match different density customized floats upon request to optimize measurement accuracy.

Q4: What signal output options are available, and does it support HART and Modbus communication?

A: Rich multi-format outputs are integrated: 4-20mA+HART intelligent signal, independent 4-20mA current, 1-5VDC voltage, RS485 Modbus RTU and PA protocol. Both 2-wire and 4-wire power supply wiring are optional, seamlessly connecting with local display meters and remote central control systems without extra signal conversion equipment.

Q5: Does this series support installation in flammable and explosive hazardous workshops?

A: Yes, dual explosion-proof certifications are optional for all models: intrinsic safety Ex ia IIC T6 Ga and flameproof Ex db II CT4~T6 Gb, meeting Zone 1/2 gas hazardous zone installation standards. 

Q6: What installation ways does the magnetic float level transmitter support?

A: Three universal industrial installation forms are available: flange connection, thread connection and bracket external mounting. It matches top-mounted, side-mounted and external bypass pipe tank structures. Standard guide tube Φ19mm (Φ14mm optional), standard float Φ75mm; stainless steel version supports customized small Φ52mm float for narrow-diameter tanks.

Q7: What is the service life of the reed switch core component, and does daily frequent calibration needed?

A: High-quality reed switches are adopted as sensing core with excellent wear resistance; there is no mechanical friction inside the guide tube during operation. Routine frequent calibration is not required under standard working conditions; only periodic inspection every 1–2 years is recommended for high-precision metering and critical hazardous process equipment.

Q8: What are the limits of operating and storage ambient temperature?

A: Stainless steel and PTFE coated models work stably at ambient temperature -30℃ ~ 75℃; PP/PVC/PVDF plastic versions adapt to -30℃ ~ 70℃ ambient temperature. Long-term exposure to ultra-high temperature direct sunlight without protective cabinets is not recommended.

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