Product Announcement from ifm efector inc.


Sanitary Point-Level Sensor Ignores Build-up-Image



ifm introduces the LMT Series Sanitary Point-Level Sensor
ifm's LMT point-level sensor is designed to monitor the level of liquids, viscous media and powders in food and beverage processing tanks and pipes. The sensor can provide reliable level indication in storage tanks and protects pumps from run-dry conditions.

High frequency capacitance technology ignores foam and deposit build-up
Viscous media, such as ketchup and mayonnaise, tend to stick to a sensing face and cause unreliable level indication. ifm's LMT Series sensor uses high frequency (MHz) capacitive spectrum profiling technology that enables the sensor to differentiate between actual product in a tank or only residue.

The LMT's high-frequency capacitive technology allows the sensor to detect measuring points at multiple frequencies which enables deeper penetration into the media. The LMT "sweeps" the frequency band of 50...200 MHz taking three measuring points: electromagnetic field damping, permittivity phase shift of the molecule polarization in the magnetic field, and the media conductivity in the electric field.

An internal sensing algorithm processes these measurements to calculate the signal amplitude. Only when actual media is present does the signal amplitude value occur at the correct frequency and switches the sensor. The combination of field damping, conductivity, and permittivity results in an efficient residue suppression.

Meets food and beverage sanitary requirements
The LMT features a PEEK sensing face with food-grade surface finish. A 316 stainless steel body ensures chemical compatibility even with the harshest cleaning agents. A high protection rating of IP68/IP69K prevents liquid ingress. Laser-etched part numbers won't deteriorate in high pressure cleanings.

The factory setting on the LMT sensors is established for different types of media which eliminates sensitivity adjustments.

Typical applications
• Level monitoring in storage and mixing tanks
• Pump monitoring to prevent run-dry conditions
• Reliable media level in pipes

 
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