All level measurements include interaction between a sensing device, and a product inside a holding container. In the previous post, we discussed the working of different level measurement transmitters. This post will discuss their advantages.
2. INTRODUCTION
In several process applications, the accurate control of liquid level
in a tank, vessel or a reactor is very essential.
In order to ensure the profitability and safety of industrial
processes, it is important that the vessels are equipped with
instruments that provide consistent and accurate level
measurements.
All level measurements include interaction between a sensing
device, and a product inside a holding container.
4. CAPITANCE LEVEL TRANSMITTERS:
The capacitor is made of two conductive plates, separated
by dielectric.
Working principle is based on the variation of electrical
capacitance of a capacitor formed by the sensor, the
dielectric material, and vessel wall.
The change in capacitance is directly proportional to the
liquid level.
Dielectric is the most significant favtor in level
measurement application.
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5. ADVANTAGES OF CAPITANCE LEVEL
TRANSMITTERS
They are mechanically simple and have no moving parts.
They require very less maintenance.
They are resistant to turbulence.
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6. HYDROSTATIC LEVEL TRANSMITTERS:
Cost-effective and loop-powered transmitters that
measure the liquid level precisely and consistently.
Compact size is ideal for fitting into pipes with smaller
sizes
These transmitters are highly popular because of its
simple installation. These are highly reliable and
robustness.
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7. ADVANTAGES OF HYDROSTATIC LEVEL
TRANSMITTERS
Sensor technologies and design variations are available
for almost every application
They have a proven measuring principle with high
reliability.
The hydraulic level transmitters have direct contact with
the medium.
They provide robust measuring processes, which are
unaffected by factors like vapor, contaminants, dust,
buildup, foam, etc.
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8. MAGNETIC LEVEL TRANSMITTERS:
Magnetic level transmitters use a small, highly magnetic
object, which is suspended in a buoyant float, inside a
narrow auxiliary column to restrict the lateral movement of
the float.
This method is useful for continuous measurement, since
the float will sink or rise depending on the liquid level in the
tank.
However, it will only work if the tank, auxiliary column, and
float are made of non-magnetic materials.
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9. ADVANTAGES OF MAGNETIC LEVEL
TRANSMITTERS:
Can be easily retrofitted into current level chambers
Easy process takeoffs with less connections
It continues to operate even in an event of electrical power
failure
Gauge, transmitter, and switches use the same
hardware/float
Transmitter and switches can be calibrated while the
system is still online
Ease of mounting
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10. RADAR FILL LEVEL TRANSMITTERS:
These transmitters use radio wave emissions.
Radar fill level transmitters are mounted at the top of a tank
filled with a liquid.
The transmitter sends a radar signal into the liquid and
receives a reflection of the signal in return.
If the time required to receive the signal is more, then it
means that the distance between the sensor and the liquid
is more.
This points to the conclusion – the liquid level in the
container is less.
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11. ADVANTAGES OF RADAR FILL LEVEL
TRANSMITTERS:
It provides accurate readings
It has minimal contact with the substance being measured
It has ease of installation and accessibility
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12. ULTRASONIC FILL LEVEL TRANSMITTERS:
An ultrasonic fill level transmitter operates similar to a non-
contact radar fill level transmitter.
It is typically mounted at the top of a container, which sends
out an ultrasonic pulse.
This pulse hits the surface of the liquid, and gets reflected.
The sensor assesses fill level depending upon the time
between the sent and the received signal.
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13. ADVANTAGES OF ULTRASONIC FILL LEVEL
TRANSMITTERS:
It can measure level without making any physical contact
with the substance being measured.
The precision of the reading remains unchanged even after
alterations in the chemical composition.
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14. LIQUID LEVEL TRANSMITTERS:
Their primary task is measuring the level of liquid in a
container.
These pressure transmitters feature an impulse tube as well
as differential pressure transducers.
A liquid pressure transmitter measures the liquid’s head
pressure at the reservoir.
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15. ADVANTAGES OF LIQUID LEVEL
TRANSMITTERS:
The devices are easy to set up.
They are equipped with impulse tubes made of 316 SS.
Liquid level transmitters assure accurate DP measurement.
They are suited for a broad range of industrial applications.
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