Magnetic Level Gauges: Versatile and Highly Visible Tank Level Measurement

Magnetic level gauge
Magnetic level indicators are used widely in liquid level measurement. Also known as Magnetic Level Gauges, or “Mag Gauges,” they are used, generally, to provide a display of liquid level in tanks and other vessels. They are popular solutions because they are visible from far distances and they have a non-invasive design which reduces the possibility of points points and the risks of fugitive emissions.

Magnetic level gauges are often employed in along with magnetostrictive, guided wave radar, or other measurement means to provide a reliable local display of liquid level. They can also be used to provide an an electrical signal that can be transmitted to recording instrumentation or controllers.

"Mag Gauge" construction is fairly simplistic – here's how it works: A magnetic float, designed for the specific gravity of the material being measured, rides inside a vertical pipe on top of the process media. A gauge with a magnetically coupled visual indicator is fastened to the pipe. As the media inside the pipe rises and falls, the visual indicator moves in the same fashion.

The features of Magnetic level gauges include:
  • Visual tank level indication. 
  • Wide operating temperature and pressure range.
  • Continuous level measurement.
  • No electric power required for operation.
  • Low maintenance. 
  • Easier to read from greater distance than glass sight gauges. 
  • Can be applied to wide fluid level ranges with a single instrument. 
  • Break resistant, sturdy.
  • Wide range of construction materials available.
  • External mounting of ancillary indicators, switches, and transmitters with isolation from process media. 
There are a number of options available so you can customize the level indicator for each specific application. The best way to proceed is to combine your process knowledge with that of a product specialist. Collectively, you'll be able to achieve an effective solution to your application challenge.

More Reliable Gas, Vapor and Flame Detection

Human Sensory Model Gas Detection
Understanding the Human Sensory Model of Gas Detection
(courtesy of MSA)
Chemical plants, refineries, processing plants, and storage facilities contain large indoor and outdoor areas that include congested arrays of complex equipment, such as tanks, pumps, pipelines, and valves. Detecting combustible gas leaks and flames in these areas can be a real challenge - even under the best of conditions. Protection from accumulating gases or unnoticed flame depends on sensors that quickly alert you to their presence. If the gas, vapor, or flame goes unnoticed, lives and property are put in danger.

Legacy sensors traditionally relied on the "sense of smell" to detect minuscule amounts of gas emanating from a leak. There's a problem with this approach though. If a leak doesn't contact the sensor, it can go undetected, leaving you unaware of a potentially critical situation. Situations whereby leaks are prevented from reaching a detector are not uncommon and are further complicated by the physical layout complexity of a room or area. Gas and vapor leaks are affected by ambient conditions, and properties such as the density of the leaking material, the surrounding ambient temperature, and nearby air flow (such as wind or breeze) all impact the detection strategy.  Irrespective to the number of traditional sensors installed, these conditions jeopardize the reliability of the detection strategy.

Human Sensory Model

Given these difficulties, a recent strategy in gas and  flame detection has emerged for use within industrial plants. A practice referred to as "The Human Sensory Model" presents a more reliable system for gas, vapor, and flame detection. This model uses "layers" of monitoring and detection in hazardous environments, with smell based detectors being one of the layers.

The layers of detection include several additional technologies, that together, mimic the human sensory system of smelling, seeing, and hearing.  Integrated optical infrared gas sensors, along with gas imaging and optical flame detectors allow detectors to see a leak or flame, while catalytic bead detectors “sniff” for gases, and ultrasonic sensors “listen” for escaping gases. These detectors react in ways resembling those of human beings (hence the name) and use the combined intelligence of multiple inputs. Through layering sensor technology, a plant can achieve a much more reliable chain of defense against hazardous gases and flames.

Always consult an application expert before specifying or installing gas and flame detection equipment. Their expertise will help ensure a safe and reliable outcome.

For more information, contact:

Power Specialties Inc.
(800) 432-6550

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