EchoTouch® US01 & US03 Reflective Ultrasonic Liquid Level Transmitter





The intrinsically safe reflective ultrasonic level transmitter provides continuous level measurement up to 9.8’ (3m) with a 4-20 mA analog signal output, and is configured via our WebCal software. The non-contact liquid level sensor features our proprietary Reflective Technology™ that delivers reliable level measurement in condensing environments. Select this sensor for small tanks with non-foaming or highly vaporous media such as chemicals, water, wastewater and oil. Typical applications include day tank, IBC or drum, cooling tower, skid or machine, process tank and waste sumps.


Offered in 1.5m (4.9’) and 3m (9.8’) measurement ranges

Reflective Technology™ measures reliably with condensation

Narrow 2” (5cm) beam width for applications with limited space

Configuration is easy with WebCal software and USB adapter

Short 1.5” (3.8cm) dead band maximizes tank filling capacity

PVDF transducer and PP enclosure for corrosive environments

Fail-safe diagnostics with selectable fail-safe signal outputs

Type 6P (IP68) compact enclosure for small tank applications/span>

Automatic temperature compensation from -40º to 80º C


Condensation is the most common variable in liquid level applications. Condensation attenuates the acoustic signal of ultrasonic sensors with horizontal transducers, weakening their signal strength and signal to noise ratio by up to 50%, and substantially reducing their measurement reliability. At the core of Reflective Technology™ is a simple fact. Unlike flat horizontal surfaces, significant water droplets cannot adhere to smooth vertical surfaces. By orienting the transducer vertically, condensation runs off the transducer and does not affect sensor performance. The unimpeded transmit and receive signals are redirected to and from the liquid off a 45º reflector, delivering reliable level measurement. Thanks gravity.

Reflective Transducer

Patent Pending

Reliable Measurement

Horizontal Transducer

Signal Attenuation





Range: US01: 1.5” to 4.9’ (3.8cm to 1.5m), US03: 4” to 9.8’ (10.1cm to 3m)
Accuracy: US01: 0.125” (3mm), US03: ± 0.2% of range
Resolution: US01: 0.019” (0.5mm), US03: 0.039” (1mm)
Dead band: US01: 1.5” (3.8cm), US03: 4” (10.1cm)
Beam width: 2” (5cm)
Configuration: Push button or WebCal® PC Windows® USB® 2.0
Memory: Non-volatile
Supply voltage: 14-28 VDC
Loop resistance: 500 ohms @ 24 VDC
Signal output:

4-20mA, two-wire

Signal invert: 4-20mA or 20-4mA
Signal fail-safe: 4mA, 20mA, 21mA, 22mA, hold last
Process temp.:

F: -40º to 176º

C: -40º to 80º

Temp. comp.:


Ambient temp.:

F: -31º to 140º

C: -35º to 60º

Pressure: 30 psi (2 bar)
Enclosure rating: Type 6P (IP68)
Encl. material: Polypropylene
Transducer type: Reflective
Transducer mat.: Polyvinylidene fluoride
Cable jacket mat.: Polyurethane
Cable type: 4-conductor, shielded
Cable length: 48” (1.2m)
Process mount: -0001: 2” NPT, -0011: 2” G
Mount gasket: -0001: N/a, -0011: Viton®
Classification: Intrinsically safe
Approval (pending): Haz Loc: Class I, Div 1, Groups A, B, C & D; Class II, Groups E, F & G; Class III; Class I, Zone 0, Group IIC, Zone 20, Group IIC; IECEx: II 1G, EEx ia IIC Gc
Entity parameters: See control drawing #610125
Compliance: CE, RoHS


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