LMK 331 Screw-In Level Transmitter

Reliable level measurement for viscous fluids

LMK 331 Screw-In Transmitter: Precision level and process measurement for liquids, oils, and gases. Features semi-flush pressure sensor for viscous/polluted media. PVDF pressure port option for aggressive substances. Available in intrinsically safe and functionally safe (SIL 2) versions. Ideal for diverse measurement applications.

LMK 331 Screw In Transmitter Product Parameters

  • Pressure Ranges: 0-400 mbar to 0-60 bar
  • Output Signal: 2-wire 4-20 mA, 3-wire 0-20 mA/0-10 V
  • Accuracy: High precision for liquids, oils, and gases
  • Electrical Connections: Multiple options including 2-wire and 3-wire systems
  • Process Connections: G 3/4″ flush for pasty/impurity media, PVDF for aggressive media
  • Media Compatibility: Suitable for a wide range of media types
  • Special Features: Intrinsically safe (Ex ia), SIL 2 compliant, customisable versions available 

LMK 331 Level Transmitter Product Highlights

The LMK331 Level Transmitter is a versatile and reliable instrument designed to measure nominal pressure ranging from 0 … 400 mbar up to 0 … 60 bar. It offers two output signal options: a 2-wire configuration providing a 4 … 20 mA signal, and a 3-wire configuration offering a 0 … 20 mA or 0 … 10 V signal. Upon request, other output signals can also be accommodated. 

One of its special features is its pressure port, which is available in two options: a G 3/4″ flush port suitable for pasty and impurity-laden media, and a PVDF pressure port ideal for aggressive substances. The LMK331 Level Transmitter also offers optional versions such as an IS-version (for 4 … 20 mA / 2-wire configuration), which is intrinsically safe for gases and dusts, and a SIL 2 application compliant with IEC 61508 / IEC 61511 standards. Furthermore, it can be tailored to meet customer-specific requirements, making it a highly customisable solution.

Screw-In Level Transmitter Applications

The LMK 331 Level Transmitter finds extensive use in plant and machine engineering, where precise measurement and monitoring of liquid levels are crucial for the safe and efficient operation of industrial processes. In this context, the transmitter is often integrated into tanks, reservoirs, and process vessels to provide real-time data on fluid levels, ensuring that machinery operates within optimal parameters and preventing issues such as overfilling or dry running.

In the energy industry, the LMK 331 plays a vital role in monitoring the levels of various liquids, such as fuels, lubricants, and coolants, within power plants and energy production facilities. Accurate level measurement is essential for maintaining the reliability and safety of energy systems, supporting both conventional and renewable energy operations by enabling automated control and early detection of potential problems.

The transmitter is also well-suited for environmental engineering (water-sewage-recycling) applications, where it is used to monitor water levels in treatment plants, sewage systems, and recycling facilities. Its robust design allows it to withstand harsh environments and aggressive media, making it ideal for ensuring compliance with environmental regulations, optimizing resource usage, and supporting sustainable water management practices.

Finally, in medical technology, the LMK 331 is employed in systems that require precise and hygienic level measurement, such as in sterilization equipment, laboratory devices, and medical fluid management systems. Its high accuracy and reliability help maintain the stringent standards necessary in medical environments, contributing to patient safety and the effective operation of medical devices.

To download the latest datasheet click here: LMK 331

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