Question:
....... method is used during indirect liquid level measurement.
....... method is used during indirect liquid level measurement.
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Think of "indirect" as meaning "non-contact" or "deduced".
Ultrasonic (sor) and radar systems are ideal for the food industry because they do not contact the food product, preventing contamition and ensuring clean-in-place (CIP) compatibility.
Ultrasonic (sor) and radar systems are ideal for the food industry because they do not contact the food product, preventing contamition and ensuring clean-in-place (CIP) compatibility.
Updated On: Jul 28, 2026
- Conductive probes
- Sor or ultrasonic
- Displacer
- Sight glass
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Liquid level measurement in food processing vessels (such as milk silos or juice storage tanks) is classified into direct and indirect methods.
Step 2: Detailed Explation:
1. Direct level measurement: These methods physically measure the height of the liquid surface from a reference line.
Examples include sight glasses (which allow direct visual observation of the liquid column), dipsticks, and direct float systems.
2. Indirect level measurement: These methods measure a secondary physical parameter that varies with liquid level (such as hydrostatic pressure, buoyancy force, or wave reflection time) and convert it into a corresponding level reading.
The sor or ultrasonic method is a non-contact, indirect measurement technique.
An ultrasonic transducer installed at the top of the tank emits high-frequency sound waves toward the liquid surface.
These sound waves reflect off the liquid surface and return to the transducer.
The system measures the round-trip travel time of the acoustic sigl and calculates the distance to the liquid surface using the speed of sound.
Because the sensor does not make physical contact with the liquid and instead deduces the level using sound wave propagation times, it is classified as an indirect method.
Conductive probes and displacers require direct physical contact with the liquid.
Step 3: Fil Answer
Thus, the Sor or ultrasonic method is used for indirect liquid level measurement.
Liquid level measurement in food processing vessels (such as milk silos or juice storage tanks) is classified into direct and indirect methods.
Step 2: Detailed Explation:
1. Direct level measurement: These methods physically measure the height of the liquid surface from a reference line.
Examples include sight glasses (which allow direct visual observation of the liquid column), dipsticks, and direct float systems.
2. Indirect level measurement: These methods measure a secondary physical parameter that varies with liquid level (such as hydrostatic pressure, buoyancy force, or wave reflection time) and convert it into a corresponding level reading.
The sor or ultrasonic method is a non-contact, indirect measurement technique.
An ultrasonic transducer installed at the top of the tank emits high-frequency sound waves toward the liquid surface.
These sound waves reflect off the liquid surface and return to the transducer.
The system measures the round-trip travel time of the acoustic sigl and calculates the distance to the liquid surface using the speed of sound.
Because the sensor does not make physical contact with the liquid and instead deduces the level using sound wave propagation times, it is classified as an indirect method.
Conductive probes and displacers require direct physical contact with the liquid.
Step 3: Fil Answer
Thus, the Sor or ultrasonic method is used for indirect liquid level measurement.
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