It is installed in the bottom part of the tank and measures the level by pressure of liquid column. It has analogic signals and a threaded or flanged connection to the tank.
In the series LMP331 and LMK 331, with a threaded connection and stainless steel body, the sensor membrane is aflorante in order to prevent clogging by grounds or sludge in the tank. The threads can be ¾ “GAS or 1 ¼” GAS.
The model LMK 351, with threaded connection 1 ½” is available with body AISI 316L or in PVC. The ceramic sensor allows measurement ranges from 0,4 m.c.a. The device chemically compatible with loads of aggressive products.
For food and pharmacy applications, there is the model DMP331P with sanitary connection DIN, CLAMP or SMS.
Also available versions with flange connection, high temperature devices (up to 300ºC), version IP68 for risky flood placements, etc.
In pressurized tanks, differential pressure transmitters with capillary and separator are applied. One socket is at the top of the tank outside the fluid level and the other plug at the bottom. The pressure difference between the lower plug (level + pressure of the tank) and upper plug (only tank pressure), corresponds to the hydrostatic pressure.
In order to have enough pressure and suitable range, we use smart differential pressure transducers (usually with HART communication) like the model DPT 200. It has a range adjustment of 1:100 in a programmable scale of 1 mbar to 20 bar. Allows static pressures of 400 bar. Can have display and local keypad and HART programming. The accuracy is 0,075%FE.