Bypass Type Magnetic Level Indicator

Designed to resolve various bottlenecks existing in long-cycle chemical and energy production workshops, this bypass liquid level measuring equipment adopts split external cavity design, which has essential differences from wall-attached magnetic level meters sold in the market. All floating sensing assemblies and magnetic indicating structures are arranged inside an independent external pressure vessel, only connected to production storage tanks through two precision machined upper and lower nozzle openings.

Supporting matched cut-off valve components to form an independent closed measuring loop, operators can fully separate, release pressure and disassemble the external cavity without touching the main tank equipment. Field technicians can complete floating body inspection, internal sediment clearance and component replacement without draining process fluid or stopping production pipelines. This design effectively avoids massive economic losses triggered by forced production halts for instrument maintenance, a core competitive advantage for reactors, storage tanks and pharmaceutical processing containers operating nonstop all day long.

The narrow-diameter connecting nozzles naturally buffer liquid fluctuations generated inside tanks. Stirring ripples, foam accumulation and liquid level surges during rapid filling will not disturb the static liquid column inside the bypass cavity, generating stable, vibration-free liquid level data that conventional direct-mounted measuring instruments cannot realize.

The external cavity's pressure resistance, temperature bearing range and material grade can be customized separately according to actual fluid traits, without being limited by the material specifications of the main tank shell. Standard 304 and 316 stainless steel structures satisfy most mildly corrosive operating environments, while custom titanium floating bodies are provided for high salinity, low density and strong oxidizing liquids. We adjust the inner diameter of the cavity and the counterweight parameters of the floating body to realize continuous monitoring of single-component liquid and high-precision identification of two-phase layered mediums.

This split bypass structure shows prominent advantages in reconstruction and upgrade projects of old storage tanks. It perfectly fits the nozzle spacing size of obsolete sight glass and mechanical floating body liquid level meters, enabling direct on-site replacement without secondary cutting or welding processing on tank shells, greatly shortening construction cycles and lowering overall transformation costs.

Built with non-contact magnetic coupling transmission technology, the entire display component excludes all dynamic sealing structures, reducing medium leakage risks and long-term daily maintenance workload. Users can install external clamping type transmitters and limit alarm switches at any later stage without disassembling the pressure-bearing cavity, supporting seamless access to factory centralized DCS remote monitoring and automatic interlock control systems.

This modular bypass liquid level measuring unit supports full personalized customization of cavity dimensions, connection standards, sealing materials and floating body structures to match diversified complex industrial operating environments. All standardized performance indicators and structural dimensions are sorted in the table below for reference during model selection and engineering technical verification.

Equipped with diversified immersed component collocation schemes, this modular bypass liquid level measuring unit can be precisely configured to match all kinds of industrial fluids, realizing stable liquid height and layered boundary monitoring for multiple process mediums:

• Petroleum and Chemical Process Mediums

Applicable to crude oil, fuel oil, heat transfer medium, industrial organic solvent, acid-base aqueous solution, chloride-rich brine and oil-water mixed layered fluid. Titanium floating body assembly is highly recommended for severely corrosive chemical environments to extend overall service cycle.

• Industrial Water System Mediums

Fully compatible with factory circulating process water, raw water, purified domestic water, industrial wastewater and condensed water with weak corrosivity. Standard 316 stainless steel cavity effectively avoids rusting and medium contamination, meeting all conventional water system monitoring standards.

• Food and Beverage Sanitary Mediums

Suitable for edible oil, fruit juice, syrup, fermentation broth and other clean low-corrosion raw production materials. Seamless welded 316 immersed components avoid medium residue and bacterial accumulation, complying with food production hygiene specifications.

• Low-Density Special Industrial Fluids

Optimized for light organic solvents and low specific gravity liquefied mediums with density higher than 0.4 kg/dm³. Custom lengthened and counterweight-adjusted floating bodies prevent deflection and stagnation to maintain smooth floating tracking.

Note: For projects requiring dual-liquid layered boundary monitoring, the density difference between upper and lower liquid layers must reach at least 0.2 kg/dm³ to ensure clear layered display effect.

Complete the confirmation of five core process parameters below to customize the most matching bypass liquid level measuring unit configuration and avoid model mismatch leading to measuring failure:

• Confirm Effective Measuring Height

Single integrated cavity is applicable to storage tanks with vertical measuring height within 5500 mm; multi-section spliced cavity needs to be selected for ultra-high vertical storage containers to lift overall structural stability.

• Verify Operating Temperature and Pressure Level

Select matched sealing accessories according to long-term stable operating temperature: adopt PTFE sealing for working environments below 200°C, and metal graphite composite sealing for high-temperature scenarios up to 400°C. Select corresponding PN/ANSI pressure grade flanges based on the maximum instantaneous operating pressure of the whole system.

• Confirm Medium Density and Measuring Objectives

For continuous tracking of single-component liquid height, ensure medium density is not lower than 0.4 kg/dm³. If oil-water or solvent layered boundary detection is needed, verify the density difference of two mediums reaches the minimum 0.2 kg/dm³ identification threshold.

• Select Immersed Component Material Combination

304 stainless steel fits conventional oil, water and weakly corrosive fluids; 316 stainless steel is applicable to food-grade, fine chemical and slightly chloride-containing mediums; titanium floating body assembly serves as an upgraded option for high-salinity and strong corrosive working environments.

• Confirm Connection Mode and Auxiliary Functional Needs

Select flange, welding neck or threaded stud connection mode according to the reserved nozzle specifications of storage tanks. Equip top exhaust plugs and bottom drain valves according to daily maintenance demands. Add HART transmitters or limit switches if remote signal transmission and automatic alarm interlock functions are required.

Although the external bypass cavity measuring structure cannot fully replace traditional wall-attached liquid level meters, it can deliver irreplaceable comprehensive benefits under the following high-demand industrial operating environments:

• Storage Containers with Nonstop Annual Production

Perfect match for reaction kettles, circulating storage tanks and energy buffer tanks running all year round. The separated overhaul design avoids production halt losses caused by regular instrument inspection, which is its core competitive advantage compared with standard wall-mounted liquid level meters.

• Storage Tanks with Violent Internal Liquid Flow Disturbance

For containers equipped with stirring equipment, circulating pumps and frequent liquid filling and draining operations, the external bypass structure isolates internal liquid fluctuation interference and maintains stable output of measuring data.

• Process Mediums Prone to Sedimentation and Scaling

Fluids containing tiny impurities and scaling components need frequent floating body cleaning and inspection work. The independently detachable cavity greatly simplifies daily maintenance procedures without interrupting the operation of storage tanks.

• Old Storage Tank Equipment Renovation and Upgrade Projects

Ideal for upgrading obsolete sight glass and mechanical floating body liquid level meters on old storage tanks. It can reuse original nozzle spacing and pressure standards to realize low-cost, zero-damage equipment transformation.

• Engineering Projects Requiring High-Precision Dual-Liquid Boundary Monitoring

Customized floating body counterweight and cavity diameter parameters support accurate identification of oil-water layered mediums, assisting factories to realize precise water cut control and improve overall production efficiency.

If you need a fully customized bypass type magnetic level indicator matched to your actual tank height, extreme temperature and pressure conditions, and special medium characteristics, submit your detailed process parameters to our professional technical team. We will provide targeted personalized configuration schemes and favorable project quotation services for your industrial measurement systems. Click the contact button below to start your custom inquiry.

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