Duplex Stainless Steel Magnetic Level Gauge

This jacketed magnetic level gauge is specially customized for process tanks holding extreme-temperature fluids that demand constant temperature isolation, a unique insulated design unavailable on standard bypass or side-mounted level indicators. Equipped with a vacuum interlayer jacket structure, it delivers dual protection: heat preservation for high-temperature media to avoid heat loss and operator scald risks, and cold insulation for cryogenic liquids such as liquid carbon dioxide and propylene to prevent medium gasification caused by ambient temperature fluctuations. The main measuring body supports duplex stainless steel, 304 and 316L construction, paired with a standard 304 insulation jacket, while users can select 304, 316 or titanium sealed floats based on medium properties. The whole unit covers a broad working pressure range from negative pressure up to 16MPa (Class900) and works stably within -30°C to 300°C. Different from ordinary magnetic level gauges without thermal protection, this model adopts fully sealed anti-frost magnetic flip assemblies that eliminate fogging or icing on the display rail under ultra-low temperature working conditions. Multiple international flange standards, drain valves and remote signal transmitters are optional to match full sets of industrial storage tank monitoring systems.

The gauge follows the communicating vessel principle to align the liquid height inside the measuring chamber with the actual liquid level inside the tank. A fully sealed magnetic float floats freely according to medium density; built-in permanent magnets drive the external sealed anti-frost magnetic flaps to flip and display real-time liquid height. Its core unique advantage lies in the independent vacuum insulation jacket wrapped around the measuring tube. The vacuum interlayer (vacuum degree ≤ -0.08MPa) blocks heat conduction and convection between the measuring tube and external environment. For cryogenic media, it slows ambient heat transfer to stop liquid vaporization; for high-temperature fluids, it locks internal heat inside the chamber and stops surface overheating. A reserved 1/2" internal thread drain port discharges sediment inside the measuring tube regularly, while customizable vent ports can be added to exhaust residual air during commissioning. If equipped with supporting transmitters, magnetic field signals from the float can be converted into standard remote output signals for DCS central control systems.

Below are complete technical specifications of our duplex stainless steel magnetic level gauge with jacketed insulation structure, designed for cryogenic and high-temperature process media requiring thermal insulation. All structural, material and performance parameters are listed for your accurate model selection and configuration reference.

• Cryogenic Petrochemical Storage Tanks Liquid CO2, propylene, liquefied low-temperature hydrocarbon storage tanks. The vacuum jacket avoids medium gasification and inaccurate level readings induced by room temperature heat invasion.
• High-Temperature Heat Conduction Oil & Thermal Fluid Vessels High-temperature heating medium storage tanks, reaction kettles. The insulation layer prevents surface heat loss and protects on-site operators from high-temperature contact burns.
• Medium-Temperature General Chemical Tanks Water-based solvent, weak acid and alkali liquid storage with no corrosion to 304/316 stainless steel; the sealed anti-frost indicator guarantees clear readings under temperature swings.
• Energy & New Energy Industry Equipment Thermal energy storage tanks, cryogenic energy storage buffer tanks, medium circulation pipelines with strict temperature control requirements.
• Fine Chemical Batch Reaction Tanks Batch production reactors with temperature cycling between low and high temperature, requiring continuous real-time liquid level tracking without frequent maintenance shutdowns.

Case 1: Low-temperature Propylene Storage Tank Monitoring (Petrochemical Plant, Shandong)

A petrochemical enterprise required level measurement for 8 sets of 3200mm propylene storage tanks. Ordinary magnetic level gauges without insulation suffered frequent propylene gasification, leading to severe reading jitter. We supplied vacuum jacketed duplex stainless steel level gauges with titanium floats. After 18 months of continuous operation, stable level display was maintained without medium volatilization failure.

Case 2: High-temperature Heat Transfer Oil Reactor Level Measurement (Chemical Fine Processing Factory)

A fine chemical factory's 280°C thermal oil reaction kettle previously used common side-mounted level gauges. Excessive surface temperature caused frequent operator burns during inspection. Our insulated jacket magnetic level gauge cut surface temperature drastically, and the sealed anti-frost magnetic flaps kept clear display under long-term high-temperature cycling. The client matched magnetostrictive transmitters to realize full remote monitoring.

Case 3: Liquid CO2 Buffer Tank Project (New Energy Factory)

The client's liquid carbon dioxide buffer tank operated at -28°C. Conventional magnetic flip displays fogged and frosted within one week. Our anti-frost sealed magnetic indicator completely solved icing display failure, and the vacuum interlayer effectively slowed CO2 vaporization, cutting medium consumption losses.

Q1: What is the core difference between this jacketed magnetic level gauge and standard side-mounted magnetic level gauges?

A: The biggest difference is the built-in vacuum insulation jacket. Ordinary magnetic level gauges have no temperature isolation structure, so they cannot be used for cryogenic or high-temperature media that need heat preservation/cold preservation. Our vacuum interlayer blocks heat exchange, preventing medium gasification or surface overheating risks. Besides, we adopt special sealed anti-frost magnetic flaps for extreme temperature environments, which standard models do not have.

Q2: Can this level gauge work for liquid CO2 and other cryogenic media?

A: Yes, it is tailor-made for low-temperature liquefied gas such as liquid CO2 and propylene. The vacuum jacket (vacuum degree ≤ -0.08MPa) isolates external heat, slowing down medium vaporization, while the fully sealed anti-frost magnetic indicator avoids fogging and icing on the display panel.

Q3: What's the maximum and minimum measurable liquid density for this gauge?

A: The applicable medium density must reach ≥0.4 g/cm³, and the actual applicable range will be slightly adjusted according to the working pressure of the on-site tank. We can customize float weight to adapt to extra-low-density fluids.

Q4: Is the vacuum interlayer of the jacket durable? Will the vacuum degree drop after long-term use?

A: The jacket is fully welded and sealed as an integrated structure. Under normal industrial working conditions, the vacuum degree remains stable for more than 5 years.

Q5: What remote signal accessories can be matched with this insulated level gauge?

A: We provide two mainstream optional transmitters: general liquid level transmitters and high-precision magnetostrictive level transmitters. Both can be installed without disassembling the measuring chamber and support real-time remote signal transmission to central control systems.

Q6: Can I customize flange standards for tank installation?

A: Yes. We support GB, HG, ANSI and other global mainstream flange standards, and customize flange size and material (304 / 316L stainless steel) according to your tank original interface parameters.

Q7: Does this model support both side-mounted and top-mounted installation?

A: Two installation structures are available for selection: side-mounted for most vertical storage tanks, and top-mounted for sealed pressure vessels with only top openings. We will recommend the most suitable mounting way based on your tank structure drawings.

Q8: What viscosity of liquid media is this gauge suitable for?

A: The applicable medium viscosity cannot exceed 10⁻⁴ m²/s. If your on-site liquid has higher viscosity, please inform our technical team, and we will optimize the float structure to prevent float sticking.

If you require a vacuum jacketed duplex stainless steel magnetic level gauge matched to your cryogenic or high-temperature tank conditions, share your medium temperature, pressure, measuring range and flange standards with our technical team. We can provide targeted structural configurations and matching accessory solutions tailored to your process equipment. Click the contact button below to send your inquiry.

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