How to measure water level in closed tank

Measurement of level of water in the Boiler drum is a classic example of water level measurement in a closed tank. In this case, as water in the drum gets heated, it turns into steam and builds up pressure above the water which is more than atmospheric pressure.

Closed water tanks are also made use of in high-rise buildings for domestic water supply. By providing pressurized underground water tank, the need for deep and extra strong foundation for the building can be avoided, which otherwise would have been needed in case of an overhead water storage tank. The underground tank is kept under pressure by compressed air. As compared to the “open to atmosphere” tank, in a closed tank, the pressure above water may change due to consumption of water from the tank or by addition of water into the tank.

Measurement/detection of water Level in closed tank can be done by various methods and by making use of various types of instruments.  PTPL manufactures a large variety of instruments required for this purpose.

A] Direct reading level gauges:-  Tubular  Level Gauge - TTG, Reflex Glass Level Gauge- RFG, Transparent   Glass Level Gauge – TFG, Magnetic Level gauge- MLG, These gauges are also available as IBR approved gauges for boiler drum level applications.

B] Level switches:- Float Pivoted Switch- FPS, Float Guided Switch –FGS, Displacer Switch-DS, Capacitance Switch – CPS, Conductivity Switch – CNS, Chamber Float Switch- CFS, Mobrey Type Vertical Level Control- VLC. Suitable switch can be selected from this range depending upon temperature & pressure rating

C] Level transmitters:-- Float Guided Transmitter- FGT, Capacitance Transmitter-CPT , Ultrasonic Transmitter- Ultratrol, Radar Transmitter, Guided Wave radar Transmitter,, Displacer Type Transmitter – DTT,  Differential pressure Transmitter – DPT. Suitable transmitter can be selected from this range depending upon temperature & pressure rating

How often do you calibrate your level transmitters?

Level Measuring Transmitter is a device providing continuous level measurement. A very common and practical application of the transmitter is to measure anything in bulk–liquid or solid– used for process control. Different level transmitters have different working principle. In this article, we are going to touch base with a few of their types and look into the detailed reason behind calibrating them.

TYPES OF LEVEL TRANSMITTERS

Using in a myriad of applications that requires measurements of levels within containers or tanks, Level Measurement Transmitter always comes handy. These transmitters are applicable in many industries such as water treatment industries, power chemicals, food & beverage, and material handling. It can be useful in various different types of processes.

Capacitance Level Transmitters–Transmitters with a dielectric medium between two or more electrodes stored in a tank or container. Capacitance level transmitters can calculate the current-fill level of the tank or container.

Hydrostatic Level Transmitter–Transmitters that determine fluid contents of a container by measuring the presence of a resting body of the fluid within it. Also, known as pressure level transmitters.

Magnetic Level Transmitters–Transmitters that are suspended in a buoyant float, usually in a narrow auxiliary column. These use magnetic objects as transmitters and help in measurement owing to the tendency to float or sink on the liquid level.

Ultrasonic Level Transmitters–Transmitters with ultrasonic transducers mounted at the top or near the top of a container. They enable the transducer to send an ultrasonic pulse and get reflected upon getting hit. The sensor calculates the level based on the time between transmitted and received the reflected signal.

Lastly, your competitive edge depends on maintaining and continuously improving your plant efficiency. This can be accomplished through periodic calibration of your transmitters at fixed intervals.

Our qualified engineers and technicians are fully trained to handle all aspects of on-site instrument calibration based on your business requirements. They can optimize your calibration intervals and identify potential improvements to help reduce calibration costs. This will ensure that your plant performs with maximum accuracy to improve your production without any temporary shutdowns. Our on-site calibration services are supported with comprehensive and easy-to-interpret calibration certificates. Hence, optimize your calibration with us and look out for any uncalled-for incidents in your machines beforehand.

How to measure water level in closed tank

Measurement of level of water in the Boiler drum is a classic example of water level measurement in a closed tank. In this case, as water in the drum gets heated, it turns into steam and builds up pressure above the water which is more than atmospheric pressure.

Closed water tanks are also made use of in high-rise buildings for domestic water supply. By providing pressurized underground water tank, the need for deep and extra strong foundation for the building can be avoided, which otherwise would have been needed in case of an overhead water storage tank. The underground tank is kept under pressure by compressed air. As compared to the “open to atmosphere” tank, in a closed tank, the pressure above water may change due to consumption of water from the tank or by addition of water into the tank.

Measurement/detection of water Level in closed tank can be done by various methods and by making use of various types of instruments.  PTPL manufactures a large variety of instruments required for this purpose.

A] Direct reading level gauges:-  Tubular  Level Gauge - TTG, Reflex Glass Level Gauge- RFG, Transparent   Glass Level Gauge – TFG, Magnetic Level gauge- MLG, These gauges are also available as IBR approved gauges for boiler drum level applications.

B] Level switches:- Float Pivoted Switch- FPS, Float Guided Switch –FGS, Displacer Switch-DS, Capacitance Switch – CPS, Conductivity Switch – CNS, Chamber Float Switch- CFS, Mobrey Type Vertical Level Control- VLC. Suitable switch can be selected from this range depending upon temperature & pressure rating

C] Level transmitters:-- Float Guided Transmitter- FGT, Capacitance Transmitter-CPT , Ultrasonic Transmitter- Ultratrol, Radar Transmitter, Guided Wave radar Transmitter,, Displacer Type Transmitter – DTT,  Differential pressure Transmitter – DPT. Suitable transmitter can be selected from this range depending upon temperature & pressure rating

How to find the right level sensor for your application

Introduction:

"There are many applications involving level measurement in process plants. There are various types of level sensors available for this purpose. It is very difficult, to find out the perfect choice. To meet the specific needs of an application, either for liquid or solids in any container, one must take into account the physical/chemical properties of a substance in question.

• How to select right measuring technology

All level measuring instrument is based on certain characteristics of the process material, such as density, pressure, temperature, etc., and its suitability for the same is to be taken into consideration. One can narrow down the options by considering the following factors before selection of right level sensor for level measurement and its suitability.

1) Applications/ Purpose of Level Measurement -

a) Visual Indication:-Various types of Techtrol make level gauges can be used for visual indication only, where the electrical output is not required.

 b) Detection of high /low and intermediate level for alarm &control action: - Level switches are useful for detection of the level at a particular point. Techtrol has a wide range of switches available.

 c) Continuous level measurement & quantity establishment with remote indication|- Different types of Techtrol make transmitters are suitable for this application. Techtrol makes transmitters are capable of digital communication and can be interfaced to PLC and DCS systems.

Thus Pune Techtrol’s wide range of level measuring instruments includes Level Gauges (visual indication), Level Switches (alarm & control action) and Level transmitters (continuous level measurement).

2) Service Medium whose level is to be measured–

It can be liquid, slurry, interface level of two liquids with different densities or powders/ granules.

Liquids can be corrosive or non-corrosive. Accordingly, the material of construction can be selected. Liquid characteristics such as specific gravity, dielectric constant, viscosity, conductivity must be taken into consideration.

How to find the right level sensor for your application

"There are many applications involving level measurement in process plants. There are various types of level sensors available for this purpose. It is very difficult, to find out the perfect choice. To meet the specific needs of an application, either for liquid or solids in any container, one must take into account the physical/chemical properties of a substance in question.

• How to select right measuring technology

All level measuring instrument is based on certain characteristics of the process material, such as density, pressure, temperature, etc., and its suitability for the same is to be taken into consideration. One can narrow down the options by considering the following factors before selection of right level sensor for level measurement and its suitability.

1) Applications/ Purpose of Level Measurement -

a) Visual Indication:-Various types of Techtrol make level gauges can be used for visual indication only, where the electrical output is not required.

2) Service Medium whose level is to be measured–

It can be liquid, slurry, interface level of two liquids with different densities or powders/ granules.

3) Operating Conditions-

Minimum and maximum operating temperature & pressure conditions within the tank must be known for the selection of right level sensor for level measurement.