Pepperl+Fuchs LUC-M**

The Ultrasonic Level Sensor from Pepperl+Fuchs is engineered for reliable level measurement in hazardous environments, where explosion protection is critical. This sensor employs ultrasonic technology to perform non-contact measurements, minimizing maintenance needs and ensuring long-term operational stability. It is particularly suited for applications in chemical processing, wastewater treatment, and bulk material monitoring.

Equipped with a four-line display, the sensor allows for quick and straightforward commissioning through menu-guided onsite operation. Users can easily visualize envelope curves for diagnostics and configure the sensor’s linearization function, which supports up to 32 points for converting measured values into various units of length, volume, or flow rate. Additionally, the integrated temperature sensor automatically adjusts for temperature-dependent sound velocity variations, enhancing measurement accuracy.

For improved accessibility, an optional remote display and operation feature allows users to monitor and control the sensor from distances of up to 20 meters, further increasing its adaptability in diverse industrial settings.

Measurement range	LUC-M10: max. 5 m (16.4 ft) in fluids and 2 m (6.6 ft) in bulk materials LUC-M20: max. 8 m (26.2 ft) in fluids and 3,5 m (11.5 ft) in bulk materials LUC-M30: max. 15 m (49.2 ft) in fluids and 7 m (23 ft) in bulk materials LUC-M40: max. 10 m (32.8 ft) in fluids and 5 m (16.4 ft) in bulk materials
Electrical connection	terminal compartment: In the F12 housing, the terminals are located underneath the housing cover, in the T12 housing, they are under the cover of the separate terminal compartment. cable gland: M20x1.5 (recommended cable diameter 6 … 10 mm (0.24 … 0.4 inch)) cable entry G1/2 or NPT1/2 PROFIBUS PA: M12 plug connector
Degree of protection	with closed housing, tested according to – IP68, NEMA 6P (24 h at 1.83 m under water surface) – IP66, NEMA 4X with open housing: IP20, NEMA 1 (also ingress protection of the display)
Type of protection	II 1/2G or II 2G EEx ia IIC T6 (KEMA 05 ATEX 1111) II 1/2G or II 2G EEx d [ia] IIC T6 (KEMA 05 ATEX 1111) II 1/2G or II 2G EEx em [ia] IIC T6 (KEMA 05 ATEX 1111) II 1/2D or II 2D or II 1/3D or II 3D T115°C or T100°C or T95°C (KEMA 05 ATEX 1111) II 1/2D or II 2D or II 1/3D or II 3D T115°C or T83°C or T84°C or T86°C (KEMA 05 ATEX 1112) II 3G EEx nA II T6
Material	material in contact with process: – LUC-M10, LUC-M20: sensor PVDF, seal EPDM – LUC-M30: sensor UP and stainless steel 1.4571/316Ti, seal EPDM, flange PP or stainless steel 1.4571/316Ti – LUC-M40: sensor PVDF, seal Viton or EPDM, flange PP, PVDF or stainless steel 1.4535/316L housing: aluminum, seawater resistant, chromated, powder-coated cover: – aluminum, for version without on-site display – inspection glass for version with on-site display
Measuring frequency	2-wire devices: max. 0.5 Hz 4-wire devices: max. 2 Hz dependent on the type of device and the parameter settings
Supply voltage	2-wire HART (standard): – current consumption 4 … 20 mA – min. terminal voltage 14 V (at 4 mA), 8 V (at 20 mA) – max. terminal voltage 36 V 4-wire HART: – DC version: voltage 10.5 … 32 V, max. load 600 andOmega; – AC version: 90 … 253 V, max. load 600 andOmega; PROFIBUS PA: 9 … 32 V DC for additional information see technical information
Explosion-hazardous area	KEMA 05 ATEX 1111, KEMA 05 ATEX 1112 , for additional certificates see www.pepperl-fuchs.com
Equipment architecture	4 … 20 mA output with HART protocol system integration via PROFIBUS PA
Current consumption	2-wire devices: – HART: 3.6 … 22 mA – PROFIBUS PA: max. 13 mA
Reaction time	depends on the parameter settings: – min. 0.5 s for 4-wire devices – min. 2 s for 2-wire devices
Reference operating conditions	temperature = 20 °C (68 °F) pressure = 1013 mbarabs humidity = 50 % ideal reflective surface (e. g. calm, smooth fluid surface) no interference reflections within signal beam set application parameters: – tank shape = flat ceiling – medium property = liquid – process conditions = calm surface
Output signal	according to the instrument version: – 4 … 20 mA with HART protocol – PROFIBUS PA
Mass	LUC-M10: approx. 2.5 kg LUC-M20: approx. 2.6 kg LUC-M30: approx. 3.5 kg LUC-M40: approx. 3 kg
Installation conditions	see technical information (TI)
Maximum measured error	typical specifications for reference operating conditions (include linearity, repeatability, and hysteresis): � 2 mm (0.08 inch) or 0.2% of set measuring range (empty calibration)1) 1) whichever is greater
Dimensions	see section dimensions
Measured variable	distance between the sensor membrane and the product surface using the linearization function, the device calculate – level in any units – volume in any units – flow across measuring weirs or open channels in any units
Measured value resolution	LUC-M10, LUC-M20: 1 mm (0.04 inch) LUC-M30, LUC-M40: 2 mm (0.08 inch)
Measuring principle	The sensor of the device transmits ultrasonic pulses in the direction of the product surface. There, the ultrasonic pulses are reflected back and received by the sensor. The device measures the time between pulse transmission and reception. The instrument uses the time (and the velocity of sound) to calculate the distance between the sensor membrane and the product surface. As the device knows the empty distance from a user entry, the device calculate the level.
Power consumption	2-wire: 51 … 800 mW 4-wire AC: max. 4 VA 4-wire DC: 0.6 … 1 W