Magnetic Liquid Level Gauge for Measuring a Boiler Drum Water Level

Float Cage Material: SS304, SS316, PTFE, PP, PVC, PVDF
Max. Centre to Centre Distance: 6000 mm, greater lengths on request
Connecting Flanges: According to DIN or ANSI B16.5
Rated Pressure: <10.0 Mpa for SS & 0.3 Mpa for PP, PVC & PVDF(Higher pressure rating can also be provided)
Temperature of Liquid: 450ºC (Max.) for SS, 80ºC (Max.) for PVDF,60ºC (Max.) for PVC, 50ºC (Max.) for PP
Specific Gravity: Min. 0.40g/cm³
Signal: 4～20mA.DC、4～20mA.DC+Hart、pulse、RS485
Switch type: NO、NC、SPDT
Explosion-proof mark: Exd II BT6
Protection Grade: IP65/IP67

A Magnetic Liquid Level Gauge for Measuring a Boiler Drum Water Level involves the use of a permanent magnet sealed inside a closed float whose rise and fall causes the rotation of bi-coloured magnetic rollers or flappers. The float is situated inside the chamber of the instrument in contact with the process medium and is not able to be viewed from the outside. The float inside the chamber is coupled to bi-coloured magnetic rollers / flappers installed in an indicating rail which is attached to the outside of the chamber. The red colour indicates the presence of liquid while the point where the colour is white shows the level of liquid in the vessel.
For this type of instrument chemical compatibility, temperature, specific gravity (density), buoyancy and viscosity are all important in the selection and design process especially for the float. For example, larger floats may be used with liquids with specific gravities as low as 0.4 while still maintaining buoyancy.
A magnetic level gauge can be used for measuring either total or interface level and offer an alternative solution to traditional reflex / transparent gauges. Accessories such as switches / transmitters can be supplied and fitted to this type of gauge and it is not necessary to have isolation valves as there is no glass to break.

material	SS
warranty	1 years
customized support	OEM
brand name	xukang
Measuring Range	6000 mm, greater lengths on request
Material	SS304, SS316, PTFE, PP, PVC, PVDF
Indicator Type	Ordinary, LED Lighting, Sealed Indicator
Working Temperature	<350 Degree C.
Pressure range	0~16Mpa
Power supply	220V
Output signal	4~20mA.DC,pulse,RS485
Grade	Industrial
Mode	FLOAT

Feature and Application:
1. Highly visible level indication with no process fluid in contact with the glass.
2. All construction by code certified welders.
3. Float designed and weighted for maximum accuracy with 75 grams minimum upward buoyant force.
4. Transmitter and switch options which can be installed, adjusted and maintained with no process interruption.
5. Safe for corrosive, flammable, toxic, high-temperature and high-pressure applications.
6. Rugged design - low or no maintenance.
7. IP68 approved local indication.

Applications of Magnetic Flap Level Gauges in Chemical & Metallurgical Industries

I. Chemical Industry

1. Storage Tank Area (Crude Chemical Raw Materials)

Various vertical/horizontal storage tanks for acid, alkali, solvent, alcohol, ester, light oil, liquid ammonia and refrigerant.
Medium features: corrosive, volatile, flammable, toxic.
Matching advantages: fully sealed structure, no medium leakage; PTFE lining / 316L / Hastelloy float optional for anti-corrosion; can equip explosion-proof 4–20mA transmitters for remote DCS monitoring, suitable for Class I dangerous chemical zones.
Installation type: side-mounted for conventional tanks; top-mounted for buried tanks, tanks without side openings or high-viscosity easy-crystallization media.

2. Reaction Kettles & Synthesis Vessels

Mixing reactors, neutralization tanks, crystallization tanks, distillation stills, extraction separators.
Working conditions: medium temperature alternation, stirring foaming, easy scaling or crystallization.
Advantages: magnetic coupling no direct contact with process medium; no leakage points; optional anti-blocking floats to reduce medium adhesion; visible two-color magnetic turning flips, clear liquid-gas boundary on site.

3. Auxiliary Equipment for Chemical Production

Deaerators, heat transfer oil expansion tanks, wastewater sedimentation tanks, intermediate buffer tanks, filter tanks, recovery condensate tanks.

For sewage and turbid waste liquid: magnetic flap avoids the defect that glass level gauges are easy to fog and scale.
High-temperature thermal oil system: high-temperature resistant floats adapt to long-term high heat working conditions.

4. Fine Chemical & Pharmaceutical Sanitary Production

Polished sanitary magnetic level gauges applied to fermentation tanks, liquid preparation tanks, sterile storage tanks. No internal dead corners, easy CIP online cleaning, meets hygiene standards.

II. Metallurgical Industry

1. Circulating Cooling Water System (Core Application)

Cooling water pools, cooling tower buffer tanks, circulating water tanks, high-pressure water storage tanks for blast furnace, converter and continuous casting equipment.

Working characteristics: large water volume, contains iron oxide slag, dust impurities, slight vibration on site.
Advantages: sturdy metal main body, strong anti-vibration performance; not easy to be blocked by tiny slag compared with glass plate gauges; stable long-term outdoor operation.

2. Waste Heat Recovery & Steam Auxiliary Equipment

Waste heat boiler drums, deaerators, condensed water recovery tanks, hot water tanks for smelting furnaces.

Replace traditional glass level gauges to avoid frequent glass cracking caused by furnace vibration; matched with remote signal output to realize central control room monitoring of boiler water level.

3. Pickling & Surface Treatment Workshop

Pickling tanks, rinsing tanks, acid-base storage barrels for steel plate surface treatment.

Strong acid and alkali corrosive environment: use PP/PTFE lined magnetic flip level gauges, effectively resist corrosion of hydrochloric acid, sulfuric acid, lye.

4. Hydraulic & Lubricating Oil Station

Hydraulic fuel tanks, gear oil storage tanks, thin oil lubrication stations of rolling mills and blast furnace equipment.

Monitor oil reserve to prevent equipment dry friction; anti-oil-adhesion floats ensure accurate liquid level display for long-term use.

5. Dust Removal & Environmental Protection Equipment

Desulfurization absorption towers, wastewater sedimentation tanks in metallurgical flue gas treatment. Adapt to turbid media with dust and suspended solids, no visual blur problem.

III. Key Difference in Application Between Two Industries

Medium Characteristics

Chemical: dominated by corrosive, flammable, toxic, crystallizable, high-viscosity chemical liquids; anti-corrosion and explosion-proof are the core demands.
Metallurgy: mostly cooling water, hot steam, lubricating oil, pickling liquid mixed with metal dust; anti-vibration, anti-slag-blocking and impact resistance are primary requirements.

Main Matching Configurations

Chemical: lined anti-corrosion floats, explosion-proof transmitters, top-mounted type for crystallized media, sanitary polished type for fine chemicals.
Metallurgy: carbon steel ordinary magnetic flap, anti-vibration reinforced support, high-temperature resistant floats for waste heat boilers, no complicated explosion-proof configuration in most cooling water areas.

Working Environment

Chemical plants: closed workshop, strict explosion protection requirements, medium easy to leak and volatilize.
Metallurgical workshops: open and semi-open, high dust, large mechanical vibration, alternating cold and hot environment.

Short Brochure Summary

Magnetic flap level gauges adopt non-contact magnetic coupling sealing structure. In the chemical industry, anti-corrosion and explosion-proof models are widely used for various chemical storage tanks, reaction kettles and dangerous medium vessels. In the metallurgical industry, vibration-resistant and anti-blocking types serve cooling water circulation systems, waste heat boilers, pickling tanks and lubricating oil stations, realizing on-site visual display and remote liquid level signal transmission for both industries.