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The AST4500 and AST4510 submersible liquid level sensors are approved to UL/cUL913 (CSA 157) Class I Div 1, Groups C and D for use in intrinsically safe areas with an approved barrier. It is also certified for ATEX / IECEx Class I Zone 0 Exia IIB T4 Ga (Ta = -40°C to +80°C). For pressure ranges from 0-1 to 0-100 PSI that require a wide range of media compatibility, the submersible series is an excellent solution to level monitoring for indoor and outdoor applications. The AST4500 and AST4510 level sensors are completely sealed for submersion, yet vented through the cable to correct for barometric pressure changes. The welded housing is tested in-house via a helium leak tester to ensure proper protection. The conductors of the cable are also isolated from the outside environment to keep the sensor operational for long-term use. With a removable nose cone, the AST4500 and AST4510 series can be also be installed outside of the tank through a 1/4” NPT pipe connection. In this configuration, the sensor continuously monitors the tank level through a threaded connection outside the tank, yet remains fully submersible for applications with flood prone environments or severe wash-down conditions. Available with voltage or 4-20mA output signals, AST can provide a cost effective solution for level monitoring for a variety of applications. 


  • High Strength Stainless Steel Construction 
  • No Internal O-rings 
  • Wide Operating Temperature 
  • Pressures up to 100 PSI 
  • Low Static and Thermal Errors 
  • Unparalleled Price and Performance 
  • Conduit Fitting at Electrical Connection 
  • Survives Harsh Environments 
  • Compatible with Wide Variety of Liquids 
  • EMI/RFI Protection 
  • 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, 1/4 FNPT, 1/4 MNPT, Nose Cone

  • Electrical Connection  Conduit 10 ft, Conduit 100 ft, Conduit 15 ft, Conduit 150 ft, Conduit 20 ft, Conduit 25 ft, Conduit 35 ft, Conduit 40 ft, Conduit 50 ft, Conduit 6 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 – 1 to 100 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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