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Ultrasonic Level Sensors

SX-LUNB Series

The SX-LUNB Series provides continuous, non-contact ultrasonic level measurement for liquids and bulk solids. Integrated, remote-sensor, externally mounted and explosion-protected versions support standard and level-difference measurement.

Measurement Range: Integrated: up to 30 m for liquids or 15 m for solids; remote-sensor: 3, 6, 10, 20 or 30 m
Measurement Accuracy: 0.2% of actual range (integrated); 0.2% of full scale (explosion-protected)
Beam Angle: 3°, 5° or 8°, depending on model
Output / Communication: 4–20 mA; optional HART or RS485/Modbus RTU
Power Supply: 24 V DC or 220 V AC
Process Connection: G2 or M95 × 2.0 thread, or flange; bracket mounting available
Process Pressure: FU4/FU8 type: ±0.1 MPa; other integrated models: ±0.3 MPa; explosion-protected: 0.04 MPa standard / 0.5 MPa special
Housing / Sensor Materials: ABS/PVC (integrated); aluminum housing, stainless-steel probe and PVC sensor (explosion-protected)
Ingress Protection: IP68 (integrated); IP66 (explosion-protected)
Medium Temperature: Integrated basic models: −45 to +95 °C

$429.00

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Product Overview

The SX-LUNB Series is designed for continuous, non-contact ultrasonic level measurement of liquids and bulk solids. It determines level from the transit time of ultrasonic pulses reflected from the material surface. Integrated, remote-sensor, externally mounted, and explosion-protected configurations are available, including standard level and level-difference measurement options.

Main Features

Non-contact ultrasonic level measurement for liquids and bulk solids.
Measuring ranges up to 30 m for liquids and 15 m for bulk solids.
Integrated basic models provide 0.2% accuracy of actual range.
Blind zones from 0.20 to 0.80 m, depending on measuring range.
3°, 5°, and 8° ultrasonic beam-angle options, depending on model.
4–20 mA output with optional upper- and lower-limit relay control.
HART and RS485/Modbus RTU communication options are available.
24 V DC or 220 V AC power-supply options.
IP68 protection for integrated basic models; IP66 for explosion-protected aluminum-housing configurations.
Integrated, remote-sensor, externally mounted, and explosion-protected configurations are available.
LCD or LED display options, depending on model.
Medium temperature up to 95 °C for integrated basic models.
Automatic temperature compensation on explosion-protected models.
Flange or bracket mounting options.

Product Application

Typical Applications

Liquid & Bulk Solids Level	Special Measurement	Hazardous & Remote Applications
Liquid level measurement	Level-difference measurement	Explosion-protected installations
Bulk solids / material level measurement	Externally mounted level measurement	Remote-sensor installations
Low-pressure vessel level measurement	Standard level measurement	Separated sensor and electronics configurations

Technical Data

Measurement
Product Type	Ultrasonic Level Transmitter
Measurement Method	Non-contact measurement using the transit time of reflected ultrasonic pulses
Measurement Range	Integrated basic: 4, 6, 8, 12, 20, or 30 m for liquids (model-dependent); up to 15 m for solids. Remote-sensor: 3, 6, 10, 20, or 30 m
Measurement Accuracy	Integrated basic: 0.2% of actual range (in air); explosion-protected type: 0.2% of full scale
Beam Angle	3°, 5°, or 8° at 3 dB
Power & Output
Supply Voltage	24 V DC or 220 V AC
Output / Communication	4–20 mA; HART or RS485/Modbus RTU
Relay Output	Optional upper/lower limit control; normally open on explosion-protected type
Output Load	0–600 Ω for integrated basic models
Output Resolution	0.03% of actual range for integrated basic models
Mechanical & Materials
Housing / Sensor Materials	Integrated basic: ABS / PVC. Explosion-protected: aluminum-alloy housing / stainless-steel probe body, with PVC sensor
Installation	Flange or bracket
Process Connection	FU4/FU8: G2; FU6/FU12: M95 × 2.0; FU20/FU30: flange diameter Ø285 mm
Pressure Range	FU4/FU8: ±0.1 MPa; FU6/FU12/FU20/FU30: ±0.3 MPa. Explosion-protected: 0.04 MPa standard, 0.5 MPa special
Measurement Cycle	1 s for integrated basic models
Remote-Sensor Ranges / Blind Zones	3 m / 0.25 m; 6 m / 0.30 m; 10 m / 0.40 m; 20 m / 0.60 m; 30 m / 0.80 m
Performance
Accuracy / Blind Zone	Integrated basic: 0.2% of actual range; blind zone 0.20–0.80 m. Explosion-protected: 0.2% of full scale
Beam Angle Options	FU4/FU8/FU12: 8°; FU6: 5°; FU20/FU30: 3° at 3 dB
Measuring Range Options	Integrated basic: 4 / 6 / 8 / 12 / 20 / 30 m; remote-sensor: 3 / 6 / 10 / 20 / 30 m
Display Resolution	FU4/FU6/FU8: 1 mm; FU12/FU20/FU30: 1 cm; explosion-protected: 0.01 m
Relay Rating	Integrated basic: 5 A, 250 VAC / 30 VDC; explosion-protected: 10 A, 250 VAC / 30 VDC
Local Operation	Three touch-sensitive keys on integrated basic models; LCD or LED display depending on model
Output Mode	4–20 mA current output; optional upper/lower limit relay control
Environmental Conditions
Medium Temperature	Integrated basic models: −45 to +95 °C
Operating Temperature by Supply	24 V DC integrated versions: −45 to +75 °C; 220 V AC versions: −25 to +60 °C; explosion-protected type: −40 to +70 °C
Ingress Protection	IP68 for integrated basic models; IP66 for explosion-protected aluminum-housing configurations
Installation & Options
Installation	Flange or bracket mounting
Explosion Protection	Explosion-protected type with separate aluminum electronics housing and stainless-steel probe body
Ordering Options	FU integrated, FUS remote-sensor, FUG level-difference, or FUW externally mounted; 24 V DC or 220 V AC; 4–20 mA, HART, or RS485/Modbus RTU where supported

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