Non-contact level sensor

Part # 90841-01


The IRU-2420 series provides a non-contact method of detecting level, presence/absence detection, volume, proximity and distance. With built in technology to compensate for unpredictable variables such as humidity, temperature and agitators, the IRU-2420 is the right sensor for your application.

Hazardous Location Certified
IRU-2420 ultrasonic sensors are suitable for hazardous locations classified under CSA Class 1, Div. 2.

Flexible Programming
This series of ultrasonics was designed with flexibility in mind. It features our AutoSense software for quick and easy programming in a variety of application settings.

A Good Fit
With a 25 ft. range, a 2 in. NPT fitting, and a 4-20mA output, the IRU-2420 sensors work well for many tank level applications.


  • AutoSense Software for hassle-free setup
  • Internal temperature compensation
  • Works on solids and liquids

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What's the Easiest and Quickest Way to Start Collecting Data and Access it Anywhere?

The Answer's in the Cloud.

eTracker is a cellular modem and "virtual" cloud-based data logger in one (meaning you don't need to install a separate data logger). Simply connect your sensor and a power source to eTracker and you're done. Configure (or reconfigure) anytime from any Internet-connected device, and use Stevens-Connect to retrieve your data, or forward it to your favorite software system.

Technical Specifications


Operating range

1 - 25 ft. (0.3 - 7.6 m)

Beam pattern

9º off axis


69 kHz


±0.25% of detected range


0.1 in. (2.5 mm)

Response time

Programmable (20 ms minimum)



4-20 mA
600 ohms @ 24 VDC
150 ohms @ 12 VDC
4-20 mA with (2) NPN outputs




Operating temp

-40º to 140ºF (-40º to 60ºC)


Total current draw

75 mA @ 24 VDC

Supply voltage

12-28 VDC

Wiring connection

4 or 5 conductor shielded cable



PVDF (Kynar®) transducer housing
PC/PET upper housing

Transducer type

Ceramic, PVDF faced