Float And Board Magnetic Level Indicator
A Flow and Board Magnetic Level Indicator (Vapor Seal Type) is a very dependable device, which is applied to determine continuously and visibly the liquid level in a tank or vessel but is particularly applied in cases where there is a toxic, corrosive, or high-pressure vapour.
In this type, the magnetic float in a sealed chamber will move with the liquid level. The float has a powerful magnet that activates external magnetic indicators (such as flaps or rollers) fitted on a board outside the chamber. The vapor seal type guarantees zero loss of process vapors or fluids and is suitable in hazardous or volatile settings.
Key Highlights:
Offers level indication without interruption.
It is suitable in the high-pressure, high-temperature, or dangerous fluid environments.
The leak-free and safe operation design is the vapor seal.
Movement of a float is converted to a visual manifestation without direct touch.
Applicable to chemical plants, refineries, storage tanks, and power plants.
Operation of Flow and Board Magnetic Level Indicator (Vapor Seal Type)
A Flow and Board Magnetic Level Indicator (Vapour Seal Type) is a visual level measuring instrument used to measure liquid levels in pressurized or sealed tanks containing volatile, toxic, or high-temperature liquids. The type of vapor seal also allows no direct contact between the atmosphere and liquid, improving safety.
Working Principle:
Float Mechanism:
A magnetic float inside the level chamber (mounted internally or externally) rises and falls with the liquid level.
The float has permanent magnets, which create a magnetic field.
Flaps or rollers: Board Indicator:
The float chamber is adjacent to an indicator board that has bi-color magnetic flaps or rolling indicators.
The magnetic field spins the flaps as the float rises and falls with the fluid level, and this gives a visual indication of the level of fluid (usually red for liquid and white for vapor).
Fitting of Flow and Board Magnetic Level Indicator (Vapor Seal Type)
The Flow and Board Magnetic Level Indicator (Vapor Seal Type) is manufactured to offer visual indication of liquid level in tanks containing toxic, volatile, or pressurized liquids where the containment of the vapor is a necessity. The correct installation provides the correct level of monitoring and system safety.
Installation procedure:
Preparation:
Confirm that the tank is depressurised and isolated.
Make sure that the level indicator and the tank connections are of the same size, pressure rating, and compatible materials.
Make sure that the float and chamber are clean and intact.
Mounting:
The indicator is normally mounted in an external position on the side of the tank with a flanged or threaded connection.
Put vapor seal pots or sealing elements to keep vapors out of the atmosphere.
Set the float chamber vertically to ensure correct movement of the float.
Closure and Backing:
Install gaskets on the flanges to provide sealing without leakage.
Use thread sealant in the case of thread connections.
Support brackets should be used to hold the indicator so that it is not subjected to mechanical stress or vibration.
Float Placement:
Lay the float into the chamber carefully, making sure it is in the right position (typically the magnetic component should be up).
Do not break the magnetic element when inserting.
Commissioning:
The isolation valves should be opened slowly to fill the chamber with the process fluid.
Monitor the correct movement of the float and make sure that the external magnetic indicator rail reflects the level correctly.
Inspect all joints to see whether they are leaking and ensure vapor seals are present.
The Flow and Board Magnetic Level Indicator
(Vapor Seal Type) is a variant of the visual level measurement instrument, which is capable of checking the level of liquids in pressurized toxic conditions, and it prevents the escape of vapor or gases. It consists of a float containing a magnet in a sealed chamber, which communicates the liquid level to an external indicator strip or board by magnetic coupling.
Accuracy, safety, and durability are guaranteed in the long term by proper servicing and maintenance.
Service and Maintenance Directions:
Routine Inspection
Check the indicator by looking at it physically and finding out whether there is any damage or misalignment.
Make sure that the float is not obstructed.
Look out for leakages along the seals or connections.
Cleaning Procedures
Clean the unit without the tank and depressurize.
Clean the internal surfaces and float using cleaning agents that are compatible.
Clear the external indicator rail by wiping it.
Float Check
Buoyancy of test floats in water or process fluid.
Check the float to see whether it is corroded, punctured, or the magnet is worn out.
Change the float when it is worn out or damaged.
Seal and Gasket Inspection
Inspect vapor seals, gaskets, and O-rings to check whether they have cracks or swelling.
Change seals according to the manufacturer’s recommendation or when compromised.
Recalibration & Alignment
Ensure the indicator scale and float movement are well matched.
Adjust the magnetic indicator and float in case of inconsistency of readings.
Flow and Board Magnetic Level Indicator (Vapor Seal Type)
It is a Flow and Board Magnetic Level Indicator (Vapor Seal Type) to monitor the liquid level safely and accurately in a tank, vessel, and process column—particularly where direct contact with vapours should be avoided. It is suitable to:
Toxic and Pressurized Fluids
Applied in operations where vapors are either dangerous or pressurised (e.g., in chemical and petrochemical plants).
Corrosive/Reactive Liquids
Suited for handling liquids such as acids, solvents, and hydrocarbons where the sealing of vapors is essential.
High-Temperature and Cryogenic Applications
Vapor seal construction helps to avoid gas leakage and can be operated at high temperatures.
Level Measurement on Interface
Is able to measure between two immiscible liquids (such as an oil-water interface).
Storage and Day Tanks
Provides safe indication of levels in tanks containing volatile liquids, fuels, or toxic chemicals.
Drugs and Oil Refineries
Typical in GMP-regulated industries in which contamination control and safety are priorities.
Offshore and Marine Applications
Applied in ballast tanks and liquid cargo surveillance where instrumentation that is tough and sealed is required.
Recommend disposal Flow and board magnetic
Level indicator ( vapour seal type )
As this form of level indicator is made of materials and used in process fluids, it must be disposed of accordingly, following pertinent environmental, safety, and industry waste procedures.
Power and Pressure Isolation
The level indicator level should be completely isolated off the process, no pressure, fluid, or electrical lines should be active.
Before removing, the system should be cooled and depressurized.
Decontamination
Rinse and wash the inside and the outside parts in order to get rid of the remaining process fluid particularly when it has been applied in toxic, flammable, or corrosive chemicals.
Use the right PPE (Personal Protective Equipment) when cleaning.
Segregation Dismantling
Metal parts (e.g. float chamber, boards, housing): It is possible to recycle them as scrap metal.
Magnetic parts and floats: Separate where feasible and treat according to material (e.g. stainless steel or non ferrous metals).
Sealing materials (vapour seal gaskets, PTFE parts etc.): Use as industrial or chemical waste, depending on degree of contamination.
E-Waste Handling (when there is transmitter or alarm system)
Transmitters, reed switches or any sensors mounted on the indicator should be considered as e-waste (electronic waste) and should be given to the authorized recycling centers.
Environmental and Documentation Compliance
Local/regional disposal guidelines (e.g., CPCB, RoHS, ISO 14001) and keep records of disposal where disposal is a part of regulated industrial compliance.
FAQs
It is a level-measuring device that is visual to show the level of liquid in tanks or vessels. Vapor seal type is meant to seal process vapors and is therefore applicable in hazardous or pressurized applications.
It employs a magnetic float that rises and falls with the level of the liquid in a closed chamber. The magnetic field of the float is used to trigger external magnetic indicators or flaps on a display board in order to indicate the level visually, without the process liquid coming into direct contact with the indicator.
The vapor seal will not allow the escape of toxic, flammable, or corrosive vapours, and operation is safe, particularly in high-pressure systems and chemical systems.
This kind of indicator is common in refineries, chemical plants, power plants, and pharmaceutical units, particularly where fluid vapors are hazardous or require containment.
The major distinction is the vapor seal design that guarantees zero leakage of vapors, providing additional safety and compliance with volatile or hazardous service conditions.
It works under the principle of magnetic coupling. A permanent magnet is placed in a sealed chamber, and the level of the liquid in that chamber is moved up and down on a float. The magnet at the center of the float makes the external magnetic pointer (board or flaps) rotate or move, indicating the level without contact.
Process vapors do not reach the environment due to the vapour seal. This is very essential when dealing with toxic, corrosive, or high-pressure vapors, and in this regard, it is safe and environmentally friendly.
The magnetic field triggers external flaps, flags, or a follower on the board as the float goes up and down with the liquid. These indicators move or spin along the tube to provide the visible and clear level indication.
No. This is a sealed design that keeps the liquid within the chamber, and the only time the external indicator moves is when the magnetic interaction occurs across the chamber wall; thus, it is ideal with dangerous fluids or pressurized fluids.
Yes. Optional magnetic float level transmitters or limit switches are supported on many models to give remote monitoring, control signals, or alarm activation.
It should be maintained regularly at every 6-12 months, depending on the process conditions, type of fluid, and how often the process is run. Nevertheless, it is worth doing visual inspection every month in search of wear or blockage.
Important activities are to clean the float and guide wires, to inspect the pulley system, to check that the vapour seal is still in place, and that the indicator pointer can move freely along the scale.
The system is supposed to be isolated and depressurized. The float may then be taken out and cleaned using an appropriate solvent or brush, depending on the nature of the fluid deposit. Before reinstalling, make sure the float is not dented or damaged.
The warning signs are: Float stuck or erratic movement, inaccurate level measurements, broken or damaged indicator tape, or visible leaks around the vapour seal or mounting flanges.
Yes, the vapour seal is to be checked when servicing. It should be replaced immediately if it is worn, or cracked or leaking to ensure pressure integrity and proper operation of the float.
First, the device is to be isolated, disconnected from all the process connections and power supplies, depressurized, and completely drained.
It must be flushed and decontaminated in order to eliminate any hazardous or residual process fluids, particularly when used with corrosive, toxic, or flammable media.
Yes. The metal components, usually stainless steel or alloy, may be dispatched to authorized metal recyclers when cleaned and segregated.
Depending on the kind of process fluid that the non-metallic components (e.g., PTFE seals or elastomeric gaskets) were in contact with, they should be regarded as industrial or hazardous waste.
These electronic parts ought to be discarded as e-waste and given to a licensed electronic waste recycler in accordance with the local environmental laws.
