Does anyone know the alarm value for the level transmitter of Tank 52 in Dandong?
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:Lol, does anyone know the answer?
The level gauge on the storage tank has a mark indicating the low liquid level. The pressure difference resulting from the vertical distance from this low level to the transmitter’s plane is calculated using the formula P=ρgh. For example, if the buffer fluid is white oil, its density is 800 kg/m³, g=9.81, and h is the distance from the liquid level to the transmitter’s plane, in meters. The calculated pressure unit is Pa
There’s a small issue: is H the installation plane of the transmitter? That’s because the tank is equipped with a high liquid level detection port and a low liquid level detection port; these two ports need to be connected to the transmitter. As for what exactly H refers to, it is the distance from one point to another.
Level transmitters generally use a differential pressure principle; they have two ports, labeled H and L. The H port is connected to the lower point on the tank’s interface, while the L port is connected to the higher point. The level height indicated by H depends on where the transmitter is installed – it corresponds to the vertical distance from the plane where the transmitter takes pressure readings to the low-level mark on the tank’s glass sight gauge.
Okay, thank you. I’ll ask again: if the liquid level transmitter is exactly at the low liquid level line, then how is a low-level alarm calculated? Or does the 52 system not generate low-level alarms at all, and only high-level alarms are needed?