EchoTouch® LU20 Ultrasonic Level Transmitter





CSA approved intrinsically safe for use in hazardous locations, the two-wire ultrasonic transmitter provides non-contact level measurement up to 18' or 5.4m, and is ideally suited for challenging corrosive, slurry or waste liquids. Push button calibrated, the transmitter is typically selected for atmospheric bulk storage, day tank and waste sump applications located within a classified area. Media examples include diesel fuel and sulfuric acid.



Intrinsically safe transmitter for use in hazardous environments

LCD digital display indicates level in inches or centimeters

EasyCal simple push button calibration for all user set points

Polypropylene enclosure rated NEMA 4X with rugged PVDF transducer

Adjustable dead band and range filters eliminate false echo returns


Range: 6" to 18' (15cm to 5.4m)
Accuracy: ± 0.25% of range
Resolution: 0.125" (3mm)
Dead band: 6" (15cm)
Beam width: 8° conical
Configuration: Push button
Memory: Non-volatile
Display type: LCD, 4-digit
Display units: Inch or cm
Supply voltage: 12-32 VDC
Loop resist.: 600 Ohms @ 24 VDC
Signal output: 4-20 mA, two-wire
Signal invert: 4-20 mA, 20-4 mA
Signal fail-safe: Reverts to safe state during echo loss
Process temp.: F: -4° to 140°
C: -20° to 60°
Temp. comp.: Automatic
Ambient temp.: F: -40° to 140°
C: -40° to 60°
Pressure: 30 psi (2 bar) @ 25° C, derated @ 1.667 psi (.113 bar) per °C above 25° C
Enclosure rating: NEMA 4X (IP65)
Encl. material: PP, UL94VO
Conduit entrance: Single, 1/2" NPT
Trans. material: PVDF
Process mount: 2" NPT (2" G)
Mount gasket: Viton®
Classification: Intrinsically safe
Compliance: CE
Approvals: CSA: Class I, Groups A,
B, C, D; Class II, Groups
E, F, G; Class III; T3C
Parameters: CSA: Vmax < 32.0 V;
Imax < 130 mA; 
Ca = 0 uF; La = 0 uH
Certificates: CSA: LR 79326


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