Loop Powered Level Transmitter – Range 25 feet (7.62 Meters)

This ultrasonic level transmitter is intrinsically safe (IS) and CSA rated for Class I Division 1 hazardous areas in the US and Canada. It has a maximum range of 25 feet (7.62 meters) and is typically used for tank level measurement but can also be used for other hazardous area applications such as measuring the roll diameter on coating machinery. The transmitter sensing element is chemically resistant and the electrical connection is a two-wire loop-powered 4-20 mA output. The SafeSonic 25-L is pre-calibrated from 1 and 25 feet but can be user-calibrated to other ranges using optional accessories.

Tank Level Measurement in Hazardous Areas

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Intrinsically Safe Level Transmitter



  • Intrinsically safe design
  • Two-wire, 4-20 mA current loop powered
  • Top or bottom NPT mounting threads
  • Chemically resistant PVDF lower body
  • Potted for wet and dirty applications
  • Ruggedized piezoelectric ultrasonic transducer
  • UV resistant, potted-in cable or 4-pin M12 connector



  • Certified for hazardous environments in US & Canada
  • Can be used to measure many liquid chemicals
  • Non-contact measurement
  • Reliable operation in wet and dirty environments
  • Low energy and low wiring cost
  • Simple mounting with standard threads


Level Transmitter Part Numbers

Level Transmitter Cable Length
safesonic-25-2w-ultrasonic-transmitter-125x150 Part Number
Configuration Accessories
Part Number
Description (see Accessories links below)
Remote Configuration Device for SafeSonic 25-L when used with SenixSAFE-L software.


SenixSAFE-L Software

  • 4-20 mA range calibration
  • Output proportional to distance, level or volume
  • 7-point linearization
  • Temperature compensation on/off (default is on)
  • Update rate
  • No target response

SafeSonic ultrasonic level transmitters for hazardous environments can be configured to provide volume outputs for non-linear tank shapes or flow outputs for flumes and weirs. If you need sensor capabilities not listed here please contact us.


Level Transmitter Specifications

Range 1 to 25 feet (0.31 to 7.62 meters)
Accuracy +/-0.25% of detected range
Output 4-20 mA, 2-wire loop powered
Temperature -40° to 140° F (-40° to 60° C)
Humidity 0 to 100% operating
Protection NEMA-4X, IP65
Transducer Ruggedized piezoelectric
Compensation Internal temperature compensation
Update Rate 15 Seconds avg. (SenixSAFE-L adjustable)
Hazardous Area Certifications Class I, Div. 1, Groups C & D, T3
Class I, Zone 0, AEx iA IIB, T3
Ex ia IIB, T3



Top Mount 3/4 in NPT thread
Bottom Mount 2-in NPT thread
Materials Transducer: PVDF (Kynar); Housing: PC/PBT
Total Weight 1.5 lbs. (0.68 kg) (with 6-ft cable)

Specifications are subject to change without notice.