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- Water level from pressure can be calculated as: h = L ref ± (p meas - p ref) × 0.70307 SG Where: h = water level (m) L ref = level reference or offset (m) p meas = measured pressure (psi) p ref = measured pressure when level reference was set (psi) SG = specific gravity
in-situ.com/en/news/water-level-measurements-with-a-pressure-transducerWater Level Measurements with a Pressure Transducer - In-Situ
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How to Measure Water Level. There are two main types of water level indicators – contact and non-contact. Contact sensors are placed in the water when measuring water level.
- Glass Level Gauge.
- Floats. Floats work on simple principle of placing a buoyant object with a specific gravity intermediate between those of the process fluid and the headspace vapor into the tank, then attaching a mechanical device to read out its position.
- Displacers.
- Bubblers.
How to Use a Pressure Transducer for Level Measurement. Measuring the level of any liquid can be accomplished if the proper considerations are taken into account. There are a few approaches that can be used to receive an accurate level measurement. Bottom of the Water
Th e height of liquid in a container can be measured using a pressure sensor. Placed at the top of the container, the pressure sensor is connected to an open-ended tube that is submerged in the container. Th e amount of water in the container exerts. a proportional amount of pressure on the sensor via the trapped air in the tube.
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The height of liquid above a submerged item is known as the “water column” or hydrostatic head pressure. The longer the distance between the surface and the submerged item, the higher the pressure. This is a known constant and can be used for determining liquid level.
The differential pressure (DP) sensor/detector method of liquid level measurement uses a DP detector connected to the bottom of the tank being monitored. The higher pressure, caused by the fluid in the tank, is compared to a lower reference pressure (usually atmospheric).
Meters of water gauge or column is a metric unit for measuring liquid level. 1 metre of water column at 4 degrees celsius equals 9806.65 pascals. The hydrostatic pressure generated by a certain liquid level is typically represented by the equivalent height of a water column.
