There is a variety of point level detectors and continuous monitoring level indicators available for measurement of liquids and solids. Each technology currently in use in the market has its own features, specifications and pros and cons. These level indicators have application in a number of industries. They are being used in controlling the level of fluids in water treatment plants, chemical refinery units, water and waste material factories and oil manufacturing plants. They have various applications in power generating plants, pulp and paper making factories and beverage and food producing plants. A number of these gauges are being used in medical labs and gauges too. Apart from that, they are used for measuring of fluid in safety equipments in marine, aviation and vehicles too. Each industry has a specific technology level indicator that works the best for it, for instance, in marine, ultrasonic level indicator is considered as the best. Here are a few technologies discussed in detail:
Hydrostatic Pressure Level Indicator:
Hydrostatic pressure sensors are most suitable for measuring the level of highly corrosive liquids present inside high tanks as well as reservoirs and have 10mbar to 1000mbar available commercially. These sensors require their mounting on the detection point, however in open air places where it isn’t possible to mount the device on a tank, there is a different version of hydrostatic pressure sensor available in the market which have the option of suspending it through a cable into the tank containing the material that needs to be measured. These devices are most efficient when the material of measurement is compatible. level gauge manufacturers
Conductive Level Indicator:
Conductive sensors are capable of measuring a variety of liquids that are conducive, for instance water or liquids like nitric acid, caustic soda, ferric chloride, hydrochloric etc. In case the measurement involves highly corrosive liquids, the conductive sensors used are the ones which contain electrodes made of titanium or stainless steel. These are also insulated with separate ceramic holders and spacers. These sensors require very low voltage; however the voltage intake also depends upon on the conductivity level of the liquid being measured. Their application in non ground wells and chemical tanks need the supply of earth rod.
Ultrasonic Level Indicator:
Ultrasonic sensors are non contact gauges that are mostly used when the measurement is of bulk solids and highly viscous liquids. Most of the time, they are used in the pump control, open channel flow and water treatment industry. They also have application in marine, vehicle and aviation. Many safety equipments, such as fire extinguishers used ultrasonic technology for measurement of liquid gases level inside the tank. These indicators release very high frequency acoustic waves (ranging from 20 kHz to 200 kHz) which reflect back and detect by emitting transducer. Since ultrasonic sensors use “electric” signals, they are considered as very intelligent and reliable devices.
Above mentioned three level sensors are currently being used in a number of different industries and are considered the best in their respective fields. Choosing one for your industry will require a little research.