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Approved to UL/cUL913 Class 1 Division 1 IS, Groups C and D with an approved barrier, the product ensures a safe, reliable source for level measurement. The AST 4520 is also certified to ATEX / IECEx Class I Zone 0 Exia IIB T4 Ga (Ta = -40°C to +80°C). The AST 4520 is offered with pressure ranges from 0-2.5 to 0-15 PSIG. The AST 4520 steel cage front end design allows for proper flow of liquids while keeping the sensor at the bottom of the tank or well. With an engraved stainless steel housing and PVDF cable, this sensor is built to handle the toughest environments. 


  • Engraved Housing 
  • Protective Steel Cage Assembly
  • PVDF Cable 
  • Compatible with Wide Variety of Chemicals 
  • Ruggedly Designed for Harsh Waste Water Environments 
  • Suitable for Waste, Salt, Brackish, or Fresh Water Systems 
  • EMI/RFI and Reverse Polarity Protection 
  • Competitively Priced for OEM Applications 
  • ABS (American Bureau of Shipping) and DNV Approved 


Please review product documents or contact us for the latest agency approval information.  

Product Type Features

  • Sensor Type  Liquid Level Pressure Transducers

  • Type  Gage

Configuration Features

  • Pressure Port/Fitting  1/2 MNPT Flush, G 1/2 M Flush, Steel Cage

  • Electrical Connection  Conduit 25 ft, Conduit 50 ft, Conduit 75 ft

Electrical Characteristics

  • Supply Voltage (V) 10 – 28, 3 – 5

Body Features

  • Port Material  316L, Alloy C276

Usage Conditions

  • Operating Temperature  -40 – 80 °C [ -40 – 176 °F ]


  • Overpressure  2X, Min

  • Pressure Range  0 – 2 to 15 psi

  • Output/Span  .5 – 4.5 V, .5 – 4.5 V, 1 – 5 V, 4 – 20 mA, 4 – 20 mA

  • Accuracy  ±0.25% FSO


  • Options  Custom Cable Lengths

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Terms and Conditions

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