Magnetic Level Gauges For Wholesale Procurement Services
Your trusted sourcing partner for magnetic level gauges in china—quality instruments at competitive prices.
Are you overwhelmed by too many conflicting quotes?
Are you worried about factory capabilities because tight project deadlines and heavy procurement tasks leave you no time to audit suppliers?
Are you wasting time researching because every factory claims their product is the best, thereby delaying your procurement schedule?
Instrava is here to help you solve your procurement challenges in China.
We serves a global clientele, including EPC contractors, OEM equipment manufacturers, procurement managers, distributors, traders, and engineering consultants. We provide curated product quotations from 3 pre-vetted factories
Standardized Supplier Qualification ProcessEvery manufacturing partner is evaluated through our standardized supplier qualification process before being included in the Instrava sourcing network. The assessment focuses on manufacturing capability, engineering expertise, quality control, delivery reliability, and long-term service support., helping our clients drastically save time on sourcing, screening, and supplier comparison.
Whether you are building new industrial production lines, upgrading and replacing legacy instruments, sourcing for wholesale trade, or requiring custom OEM production, we empower you to secure the most perfectly matched products.
Let’s collaborate for mutual success. With our customer-centric service, Instrava is your trusted procurement partner in China.
Want to know the pain points when purchasing magnetic level indicators?
When purchasing magnetic level indicators, price should not be the primary consideration. Instead, priority must be given to technical factors: medium characteristics (density, corrosivity, viscosity, etc.), operating pressure, temperature, mounting configuration, and explosion-proof certifications. Focus on critical application pain points to ensure precise and rigorous procurement.
Note: Specifications may vary depending on manufacturer configuration and customization requirements. Please contact us for detailed technical confirmation.
Magnetic Level Indicator (MLI) Selection & Customization Guide
| Parameter Category | Standard / Regular Specs | Customizable / Optional Choices | Selection Considerations |
| Mounting Type | Side-Side Mounted | • Top-Mounted • Side-Top / Side-Bottom Mounted • Bottom-Mounted / Inverted | Vessel geometry (underground tanks require top-mounted), spatial headroom, nozzle orientation. |
| Measuring Range (C-C) | 300 mm to 3000 mm | • Custom Lengths: Up to 6000 mm (Sectional design available for transportation/installation) | Actual working level span, transport limits, and vertical installation clearance. |
| Wetted Materials | 304 / 316L Stainless Steel | • Corrosion-Resistant: PTFE / PFA / PP / PVC Lined • Exotic Alloys: Titanium, Hastelloy C-276, 321 SS | Medium corrosivity, pH levels, and purity requirements (Titanium for severe corrosion or low-density high-pressure applications). |
| Medium Density | $\ge 0.8\text{ g/cm}^3$ | • Low Density: Down to $0.45\text{ g/cm}^3$ (LPG/LNG/Light Hydrocarbons) • Interface Level: Dual-density floats ($\Delta\rho \ge 0.1\text{ g/cm}^3$) | True operating density. Low-density fluids or oil-water interface applications require custom float displacement engineering. |
| Operating Pressure | PN16 / PN25 / PN40 (1.6 ~ 4.0 MPa) | • High-Pressure Class: PN64, PN100, PN160 up to PN320 (Class 150# to 2500#) | Thicker float walls needed for high pressure increase weight, requiring precise fluid density validation. |
| Operating Temp. | -20°C to 100°C | • High-Temp: 100°C to 450°C (High-temp AlNiCo/SmCo magnets & ceramic flags) • Cryogenic: -160°C to -20°C (Vacuum insulation jacket) | Avoids demagnetization at high temps and frost buildup on indication scales at cryogenic temps. |
| Process Connection | DN20 / DN25 Flange (HG/T 20592) | • Standards: ASME/ANSI B16.5, DIN, JIS, GB/T • Sizes & Ratings: DN15–DN100 / Class 150#–2500# • Connection Types: NPT Threads, Tri-Clamp, Socket Weld | Mating nozzle specs on client vessels. OEM skid builders often prefer threaded or sanitary tri-clamp connections. |
| Indication Display | Red/White or Green/White Aluminum Flags (IP65) | • Alternative Materials: Plastic flags (corrosive environments), Ceramic flags (high temp) • Illumination: Night-glow / LED Backlit flags • Custom Scale: Percentage (0-100%), Metric (mm), Volume (L/m³) | Plastic flags for harsh chemical fumes; ceramic for extreme heat; backlighting for low-light/night operation; volume scale for direct metering. |
| Remote Transmitter | None (Visual Only) | • 4-20mA + HART Protocol • Modbus RS485 • Reed Switch Chain / Magnetostrictive Sensing | Required when integrating liquid level data into DCS, PLC, or SCADA automation systems. |
| Alarm Switches | None | • Bistable Magnetic Switches (High, Low, High-High, Low-Low) • Custom quantity (1 to 4 units) | Ideal for interlock alarms, pump start/stop control, and emergency safety shutdowns. |
| Explosion Proof & IP | Intrinsic Safety (Ex ia IIC T6 Ga) | • Flameproof / Explosion-Proof: Ex d IIC T6 Gb • Ingress Protection: IP66 / IP67 / IP68 (Submersible) | Mandatory for hazardous zones (oil & gas, chemical processing plants). |
| Thermal Tracing | None | • Steam / Hot Water Jacket • Electric Heat Tracing (EHT) (Self-regulating/Constant wattage) • Vacuum Insulation Jacket | Prevents media crystallization, freezing, or high viscosity buildup (e.g., heavy oil, benzene, liquid ammonia, winter protection). |
| Drain & Vent Ports | Bottom Drain Valve + Top Vent Plug | • Valve Upgrades: Ball Valve, Needle Valve, Gate Valve, Flanged Drain Valve • Flushed Ring / Cleaning Ports | Simplifies maintenance and cleaning depending on media sediment levels; hazardous fluids require flanged drain valves. |
Instrava provide a better purchasing experience for you.
Looking to buy 1pcs magnetic level indicator to replace an existing unit in your plant? Contact us now.
Need a custom batch of 500 units for your OEM machinery production? Contact us now.
Our fully vetted manufacturing partners bring 10 to 30+ years of R&D and production expertise, equipped to solve even the most complex working conditions.
With global compliance and top-tier certifications—including ATEX, IECEx, EAC, CSA, PED, ASME, SIL, LR, and CCS—our products are ready for deployment anywhere in the world.
Product quality is our cornerstone; delivering exceptional service is our mission.
Magnetic Level Indicator (MLI) Classification Matrix
Main Components:
Main chamber
Main chamber
Standard operating conditions: 304/316L seamless stainless steel pipe; welded pipe is strictly prohibited to prevent weld seams from protruding and obstructing the float. For high-temperature and high-pressure applications, materials such as 321 stainless steel, Hastelloy, or titanium are used.
Highly corrosive media: The chamber interior is lined with PTFE, ensuring a dense lining free of blisters or delamination; for low-pressure applications involving highly corrosive media, PP or CPVC plastic chambers are available options.
, magnetic float
Magnetic Float
Regarding the common material options for magnetic flap level gauges, 304 stainless steel, titanium alloy, and PP (polypropylene) are frequently used for the float. 304 stainless steel offers good corrosion resistance and mechanical strength, making it suitable for a wide range of media; titanium alloy provides superior corrosion resistance and is lightweight, making it particularly ideal for highly corrosive media; and PP is a lightweight, corrosion-resistant plastic suitable for applications requiring non-metallic materials. Conversely, ordinary carbon steel is rarely used as a float material in magnetic flap level gauges due to its poor corrosion resistance.
, magnetic flip indicators (flags)
Magnetic Flip Indicators
When selecting the model, comprehensive consideration should be given to the instrument’s operating environment (indoor/outdoor) and the medium temperature. For indoor applications at ambient temperature, ABS plastic flaps offer the best cost-performance ratio; for outdoor use or high-temperature environments exceeding 120°C, aluminum alloy flaps are recommended; in cases of high temperatures, ceramic flaps should be selected to ensure the instrument’s long-term, stable operation.
, flanged or threaded process connections
Flanged or Threaded Process Connections
Flange connections are a common method suitable for liquid level measurement in medium-to-high-pressure, large-diameter vessels—such as petrochemical storage tanks and high-pressure reactors—offering rigid attachment, excellent sealing, and high pressure resistance; they accommodate various pressure ratings and ensure stable, reliable installation. Threaded connections are suitable for liquid level measurement in small-diameter, low-pressure vessels or pipelines—such as small storage tanks and laboratory equipment—offering ease of installation and a compact footprint, though they have lower pressure-bearing capacity and are limited to low-pressure applications.
, top vent valve, and bottom drain valve.
Key Features:
Complete physical isolation, zero leakage safety, passive operation (no power required), and extreme condition durability.
| Classification Category | Core Type | Key Technical Features & Structure | Typical Applications |
| By Mounting Structure | Side-Side Mounted | Communicating vessel principle. Connected via side flanges at top and bottom. Simple structure and easiest maintenance. | Vertical/horizontal aboveground storage tanks, reactors, and pressure vessels. |
| Top-Mounted | Chamber tube inserted vertically from the tank top. Internal float drives upper magnet via a connecting rod for top indication. | Underground tanks, buried oil storage, vessels with top-only nozzle accessibility. | |
| Side-Top / Side-Bottom | Main chamber mounted on the side, extended via elbows to the top or bottom nozzle to fit space constraints. | Space-restricted equipment, compact OEM skid packages. | |
| By Operating Pressure | Atmospheric / Low Pressure | Design pressure $\le 2.5\text{ MPa}$ (Class 150#). Thin-wall chamber tubing (2.0–3.0 mm). | Water storage tanks, diesel tanks, atmospheric vessels. |
| Medium-High Pressure | Design pressure $4.0 \sim 10.0\text{ MPa}$ (Class 300#–600#). Heavy-wall tubing with forged high-pressure flanges. | Chemical process reactors, medium-pressure vessels. | |
| Ultra-High Pressure | Design pressure $\ge 16.0\text{ MPa}$ (up to 32.0 MPa / Class 2500#). Reinforced pressure-resistant floats. | High-pressure separators, hydrocracking reactors, boiler drums. | |
| By Operating Temperature | Cryogenic / Low-Temp | Equipped with vacuum insulation jackets or anti-frost acrylic windows to prevent frost buildup obscuring vision. | LNG, liquid ammonia, liquid oxygen/nitrogen down to -160°C. |
| Ambient Temperature | Working temp -20°C to 100°C. Standard magnetic floats with aluminum indicator flags. | Industrial water, light oils, non-viscous liquids. | |
| High / Extreme Temp | Uses high Curie-point magnets (AlNiCo / SmCo) with ceramic flags to prevent high-temperature demagnetization. | Thermal oil heaters, power plant boiler drums, distillation columns (up to 450°C). | |
| By Corrosion Resistance | Standard Metallic | Wetted parts in 304 / 316L / 321 stainless steel. Resistant to mild corrosion and general solvents. | Water, clean fuels, non-corrosive chemical media. |
| Plastic / Lined Anti-Corrosion | Chamber lined with PTFE / PFA, or constructed entirely from PP / PVC / PVDF plastics. | Hydrochloric acid, hydrofluoric acid, concentrated sulfuric acid, caustic soda. | |
| Exotic Alloy | Wetted parts in Titanium, Hastelloy, or Monel alloys. | Severe corrosion combined with high pressure, high chloride media, desalination plants. | |
| By Media Characteristics | Heated / Thermal Tracing | Chamber wrapped with steam/hot water jackets or electric heat tracing (EHT) to maintain temperature. | Heavy fuel oil, asphalt, benzene, crystallizing or high-viscosity media. |
| Liquid-Liquid Interface | Features a precision weighted dual-density float floating strictly at the liquid interface. | Oil-water separators, extraction towers, settling tanks. |
Comprehensive Industrial Applications of Magnetic Level Gauges
Safe, maintenance-free, and high-visibility liquid level visual indication across extreme, corrosive, and hazardous process industries.
Oil & Gas, Refining & Petrochemicals
In oil refineries, offshore platforms, and petrochemical complexes, Magnetic Level Gauges (MLG)
"We sourced 24 sets of high-temperature, high-pressure Magnetic Level Gauges from Instrava for our Dammam refinery project. Operating continuously under extreme heat and heavy vibration, the units have achieved 100% leak-free, fault-free performance. Even under direct desert sunlight, the dual-color magnetic flags remain effortlessly readable, completely eliminating our persistent fugitive emission issues. The overall craftsmanship, manufacturing quality, and engineering precision are deeply impressive!"
— Tariq Al-Ghamdi, Lead Procurement Engineer
replace fragile glass level gauges. They provide 100% leak-free, high-visibility monitoring for crude oil storage, flash drums, and oil-water separators.
By utilizing custom-weighted floats calibrated to precise specific gravities, magnetic level indicators excel at measuring liquid-liquid interfaces (such as oil/water boundaries). The complete physical isolation of volatile hydrocarbons within a sealed bypass chamber guarantees zero risk of toxic or flammable vapor leaks.
Chemical Processing & Corrosive Acids
Chemical plants handle aggressive, toxic, and highly reactive media such as hydrochloric acid (HCl), sulfuric acid (H₂SO₄), caustic soda, and chlorine solutions.
Engineered with specialized wetted materials—including PTFE/PFA linings, Hastelloy C-276, Titanium, or PP/PVC—magnetic level gauges provide ultimate corrosion resistance. Completely isolated from process fluid fumes, the magnetic indication flags remain clean and readable indefinitely without glass etching or leakage risks.
Power Generation & Steam Boilers
Thermal power plants, combined-cycle facilities, and industrial utility boilers demand uncompromised safety across high-pressure boiler steam drums, feed-water heaters, deaerators, and condenser hotwells.
Operating reliably under pressures up to PN160 / Class 2500# and temperatures up to 450°C, high-temperature magnetic level gauges feature ceramic flags and high Curie-point magnets. They provide clear visual indication unhindered by dense steam phases that typically distort optical sight glasses.
LNG, LPG & Cryogenic Gas Storage
Pressurized, liquefied, and cryogenic gases—such as Liquefied Petroleum Gas (LPG), Liquefied Natural Gas (LNG), anhydrous ammonia, and liquid nitrogen—require hermetic sealing and anti-frost design.
Equipped with specialized vacuum-insulation thermal jackets and acrylic anti-frost extensions, magnetic level gauges prevent ice buildup on the display scales at temperatures down to -160°C. Explosion-proof certification (ATEX/IECEx Ex d) makes them the ideal choice for spherical fuel tanks and LPG storage terminals.
Water & Wastewater Treatment
In municipal waterworks, industrial effluent treatment plants, and seawater desalination facilities (SWRO), magnetic level indicators are widely specified for chemical dosing tanks, neutralization pits, and sludge reservoirs.
They offer a rugged, low-maintenance alternative to ultrasonic sensors in foaming or turbulent tank conditions, providing direct visual level readings without requiring power supplies or periodic recalibration.
Pharmaceuticals & Food Processing
Hygienic manufacturing environments require strict compliance with sanitary standards (3-A, FDA) for purified water (PW), water for injection (WFI), fermenters, and syrup storage tanks.
Sanitary magnetic level gauges feature electro-polished 316L stainless steel chambers, sanitary tri-clamp process connections, and dead-leg-free internal designs that support CIP (Clean-In-Place) and SIP (Sterilization-In-Place) procedures while preventing bacterial growth.
Magnetic Level Gauge Interactive Ordering Matrix
Comprehensive spec selection covering standard, anti-corrosive, high-temp/high-pressure, cryogenic, and interface level measurement for Oil & Gas, Chemical, Power, and Water Treatment applications.
Standard vessel side nozzle mount
Underground tanks / Sump wells
Ultra-deep top insert with flexible guided rope
Side top & bottom chamber nozzle
Side bottom & top nozzle layout
Full vertical end-to-end vessel mounting
Standard liquid level measurement
PTFE/PP lined for severe acids & alkalis
Steam tracing jacket for heavy viscous oil
Self-regulating electric heating element
Cryogenic acrylic frost extension shield
High-safety seal chamber for NH3 storage
High-pressure liquefied petroleum gas
Boiler feedwater & refinery reactors
Standard Stainless
Low-Carbon Acid Proof
Chemical plastic
Water & acid plastic
High chloride/seawater
PTFE Lined Body
Hastelloy / Monel / 316L+PTFE
2.5 bar
6 bar
10 bar
16 bar
25 bar
40 bar
63 bar
100 bar
160 bar
ASME 150#
ASME 300#
ASME 600#
ASME 900#
ASME 1500#
ASME 2500#
Special Pressure Rating
• Flange Connection: 20/RF/14 (DN20 RF Sealing Face Welded Flange)
• Thread Connection: 16/G1/2" (G1/2" Female Thread)
• Pipe Welding: 17/25/4 (Welded Pipe OD x Wall Thickness: 25 x 3mm)
LNG Cryogenic Service
Ultra Low Temperature
Low Temp Refrigeration
Cold Ambient
Standard Ambient
Medium Temp Warm Process
High Temp Steam / Thermal Oil
High Temp Refinery / Boiler
Ultra High Temp Power Service
• Interface Level Measurement: Indicate densities of both liquids separated by slash (e.g. 0.80/1.20)
• Top Mounted (D): Insert length L1 (mm)
• Rope Type (G): Indicate L / L1 / L2 distances (mm)
Standard weatherproof outdoor scale
Acid / Marine / High temperature resistant
Ultra-corrosive chemical atmosphere
Visual indication only
Standard reed chain transmitter
Digital SCADA communication
±1mm accuracy level transmitter
Explosion-proof hazardous zone
No alarm contacts required
Single high or low limit alarm
Dual high & low limit alarm
Explosion-proof bistable switch
Request Official B2B Engineering Quotation
Selecting items in the spec matrix above will auto-generate your detailed engineering payload below.
FAQ For Purchasing Magnetic Level Gauge
What is the process for purchasing magnetic level gauge from Instrava supplier ?
1. Inquiry (We will respond to your inquiry within 24 hours to confirm specifications and initiate the process.)
2. Quotation (Quotation timelines vary based on the project type and your specific requirements. Standard stock items are quoted within one day, while special orders require three days or a mutually agreed-upon timeframe.)
3. Product Selection (We will present 3–5 product options and pricing for your approval. During this stage, we verify the manufacturer’s production capabilities and relevant national certifications.)
4. Contract, Prepayment, and Production (A 40% prepayment is required to initiate production at a qualified facility. For stock items, we promptly arrange for product testing and packaging.)
5. Interim Payment (Upon successful completion of production and quality inspection, the next 50% of the total amount is due. For stock items, this payment is made after packaging is complete.If the transaction amount does not exceed $50,000, the remaining 60% is paid.)
6. Shipment (You may designate a freight forwarder, or we can arrange shipping for you.)
7. Receipt of Goods (Our Quality Guarantee: When your cumulative order value reaches $50,000, you pay the remaining 10% only after receiving and verifying the product quality. We let our quality do the talking.)
8. After-Sales Service (We actively address and resolve issues through both online and offline channels. We place great importance on after-sales support, as it reflects our responsibility and reputation—the foundation of Instrava’s long-term growth.)
What are the advantages of buying products from Instrava ?
Buying from Instrava gives you the best of both worlds—the direct-from-source pricing of a factory, combined with the professional service, product range, and risk mitigation of an elite sourcing partner. Here is how we deliver value to your business:
Unbiased Market Curation (More Choices & Better Prices): Unlike single factories that only praise their own capacity, or traditional trading companies restricted by personal connection networks, we evaluate the entire Chinese manufacturing landscape. We benchmark and source from multiple verified factories to secure the most competitive pricing and the exact product specifications you need.
100% Transparency (Your “Brain” in China): We never hide behind the veil of being a “fake manufacturer.” We act as your transparent, in-country purchasing department. You always know exactly who is producing your goods, how much they cost, and what the real lead times are.
Uncompromised Quality & Risk Mitigation: Our business is built on long-term partnerships, not one-off high-profit transactions. We perform strict, independent quality control from your perspective before shipment, protecting you from post-purchase defects and communication breakdowns.
Streamlined Communication & Service: No more dealing with slow, production-centric factory service. We provide a single, highly responsive point of contact that manages the entire supply chain—from negotiation and quality checks to shipping logistics—saving you time and reducing headaches.
What types of industrial automation instruments products can you purchase from Instrava?
Level gauge, flowmeter, transmitter, level switch, Gas Alarm Controllers etc.
How to ensure the reliability of the purchased products?
Our customer-centric philosophy prioritizes their procurement needs.
1. Initially confirm the manufacturer based on product pricing and the strength and qualifications of the production factory.
2. Verify the manufacturer’s production environment through video and on-site inspections to check the compliance of the entire product manufacturing process.
3. Ensure post-production product testing and retain data and video evidence from the verification process(testing and verification methods vary depending on the product).
How does Instrava ensure product protection and physical safety during cross-border shipping?
Firstly, we confirm the packaged products with the factory (different products require different packaging and shipping methods. Heavy equipment and bulk shipments are securely secured within sea freight containers using custom-designed engineering steel frames, heavy-duty multi-layer wooden crates, and industrial-grade vacuum rust-proof bags. Precision instruments are protected against impacts and maintained in a stable position; the factory has extensive experience in this area. Custom labels are affixed to the outer packaging).
Secondly, we maintain communication with the freight company to confirm the condition of the goods and advise them to handle the loading and unloading processes with care.
What warranty policies and after-sales technical support does Instrava offer to international customers?
1. Instrava offers a comprehensive 12 to 24-month warranty (specific warranty period depends on the product line), covering all manufacturing and component defects.
2. When online technical support is needed, customers can connect with factory engineers online. Real-time guidance is provided for installation, on-site calibration (for instruments), and commissioning. When on-site engineer support is needed, we will arrange for an engineer to visit the site.
3. In the event of component issues, we will ship replacement parts via international express delivery (DHL/FedEx) to minimize your project downtime.
4. Whether a product requires replacement or repair will be clearly stated in the purchase contract.
Why Trust Instrava?
We select manufacturers from a neutral, impartial standpoint, always with your best interests in mind.
Our very existence depends on helping you source the products that are the perfect fit for your needs.
Based in China, we are able to conduct on-site inspections of production environments and product quality firsthand.
We help you avoid intermediaries posing as factories.
We facilitate smoother after-sales support, eliminating time zone issues and the delays often associated with dealing directly with factories.
Our multilingual team ensures effective communication.
For a trading startup, every interaction with a client is a precious opportunity—a sign that you are willing to place your trust in us and give us the chance to prove ourselves.
In the digital age, while information is easily accessible, misconceptions often cloud the trust between people.
Instrava relies entirely on trust; it is our core philosophy and the foundation of our existence in society. It is the fundamental basis for our long-term growth and our commitment to serving the community.
Please place your trust in us.
