ifm LMT121 Capacitive Point Level Sensor, low-water media

ifm LMT121 Capacitive Point Level Sensor, low-water media

The ifm LMT121 is the variant of the hygienic LMT capacitive point level sensor that is preset at the factory for media with a low water content, such as oils, fats and some solvents. That preset matters, because low-permittivity products produce a much smaller capacitance change than water, and the evaluation needs to be tuned to see them reliably. It shares the stainless steel housing, the PEEK probe of 11 mm length and the G 1/2 sealing cone connection with the LMT100.

The sensor handles tank pressure from -1 to 40 bar and medium temperatures from -40 to 100 degrees Celsius. Seven Star LLC supplies the LMT121 in Oman and the GCC as an independent supplier.

LMT121 technical specifications

The table lists the values published by the manufacturer for the LMT121. Where a parameter has several operating modes, the headline value is shown; the full parameter list is in the manufacturer documentation.

How the LMT121 works

The LMT121 detects the presence of a medium at the probe tip with a capacitive principle: when liquid, paste or powder reaches the probe, the capacitance of the sensing electrode changes, and the electronics compare it with a stored reference for the selected medium type. The medium type is preset at the factory and can be changed through IO-Link, which tunes the sensing to the product. Because the stainless steel body and PEEK probe have no moving parts, the sensor is not affected by wear, sticking or mechanical float problems.

Where the LMT121 fits and related parts

The LMT121 is the choice for fuel, lube oil and edible-oil style products with a G 1/2 sealing cone fitting. For water-based products take the LMT100, and for oil with a 1/2 inch NPT screw-in thread the LMC510 is closer. Because the sensing system is the same, the parameters can be changed through IO-Link, but the factory preset saves commissioning time.

Selection and ordering checklist for the LMT121

Work through the points below before you confirm the order, so that the LMT121 you receive is the one your machine or plant needs.

• Confirm the medium has a low water content and note the dielectric properties from the product data
• Check the tank pressure and temperature, including CIP peaks
• Match the G 1/2 sealing cone connection
• Decide on switching or IO-Link operation
• Check how deposits behave: sticky oils can leave films that need parameter adjustment

The manufacturer lists this article under the type designation Sensor for point level detection, LMACE-A12E-QSKG-2/US. The article number LMT121 is the reference to quote when ordering, and the type designation is useful for technicians who compare the label on an installed unit.

Installation, commissioning and maintenance

Install the sensor in a nozzle or tank wall so that the probe tip protrudes by the stated length into the product, keeping it away from internal structures and filling jets. Seal it with the correct cone or thread seal for the process connection and observe the allowed tank pressure and medium temperature. At commissioning, select the medium type, run the tank to the switching level and check the output, and then test with product that clings to the probe to see that the build-up is rejected. Inspect the probe from time to time for heavy deposits and keep the M12 connection tight and dry.

After installation, test with the real product: oils and fats can leave a film, so run a fill-and-drain cycle and confirm the output changes state correctly. If the film causes a stuck signal, adjust the parameters via IO-Link, and plan inspection of the probe during scheduled shutdowns.

Typical applications in Oman and the GCC

In Oman and the GCC the LMT121 serves lubricating-oil reservoirs, hydraulic tanks, fuel day tanks and edible-oil or fat processing. It is also used for overfill and dry-run protection on skid tanks, with the stainless steel body resisting hot ambient air.

Level sensors in tanks exposed to Gulf summers must tolerate hot product, condensation on cold nozzles and long periods without attention. Plan a periodic proof test of the alarm point, and record the output state at known levels during commissioning.

LMT121 compared with related ifm types

The table places the LMT121 next to neighbouring types in the same application group, so you can see whether a sibling would suit the job better.

Information to send with an RFQ for the LMT121

To prepare an accurate offer for the LMT121, please include the following with your enquiry:

• Medium (water-based, oil, powder or paste) and its temperature
• Tank pressure and cleaning method (CIP or washdown)
• Process connection type and thread
• Switching or IO-Link requirement
• Quantity and delivery location

Documents and quotation

No datasheet is attached to this page. Send us the part number LMT121 and we will confirm which documents are available, such as the datasheet and operating instructions, and for IO-Link devices the device description file.

Seven Star LLC is an independent supplier in Muscat serving Oman and the GCC and is not affiliated with the manufacturer; the name ifm is used only to identify the product. Prices are not shown on the page, so send the part number, the quantity and the delivery location to receive a quotation.