Ultrasonic Level Transmitters

Babbitt ABM Series Ultrasonic Level Transmitters allow simple and reliable non-contact level measurement of fluids in a tank, sump or other container. The microprocessor-controlled circuit generates a pulse that is transmitted from the transducer face. This pulse is reflected back from the fluid surface and the transit time is converted into a current output directly proportional to the fluid level.

Because the speed of sound changes as air temperature changes, each transducer has a built-in temperature compensation, thus increasing the accuracy of the output.

The circuit automatically filters out false echoes that may be produced by peripheral obstructions in the tank. The ABM Series has a proprietary circuit that locks onto the farthest echo which will always be the fluid level.

The current output can power a load of up to 750 ohms. The power source for the current loop is field selectable. The ABM Series can provide the power for the loop or an external 24VDC power supply may be used. Default for lost echo hold time is 30 seconds, then output of 22mA or 2mA. (User Programmable).

The Factory can supply digital readouts with optional set points for self-contained alarm/control systems.

A single push-button is used to set the zero and span. Calibration can be done in the vessel by varying the fluid level or the unit can be calibrated on the bench by aiming the transducer at a target. Factory pre-calibrated units are available. The 4mA and 20mA points are independent and fully adjustable over the span of the unit. Feedback for the calibration procedure is provided via a "green-yellow-red" LED. The calibration settings are stored in non-volatile memory, so the unit stays calibrated even during loss of power.

The 4mA and 20mA points are independent and fully adjustable over the span of the unit. Feedback for the calibration procedure is provided via a "green-yellow-red" LED. The calibration settings are stored in non-volatile memory, so the unit stays calibrated even during loss of power.

Babbitt offers a complete line of Ultrasonics. These include 4 wire (115VAC), 3 wire (24VDC), 2 wire loop power, 2 wire loop power with HART 7 and sanitary models. Please feel free to contact us directly at the factory to discuss which model is right for your application.

Product Features

  • Simple push button calibration
  • 4-20mA or 20-4mA output
  • Non-volatile memory-batteries not required
  • Microprocessor based reliability
  • Ignores peripheral obstructions
  • Built-in temperature compensation
  • Field or bench calibration
  • Self-cleaning face eliminates condensation

Liquid Applications:

  • Water/Wastewater
  • Food/Beverage
  • Chemicals/Oils
  • Viscous Fluids/Slurries

Specifications:

Electrical

Power: 115VAC/60Hz, 230VAC/50Hz or 12-30VDC
Output: 4/20mA or 20/4mA, 6.1uA resolution 750 ohms, isolated w/ AC supply; non-isolated w/ DC supply
Fuse: 0.125A/250V type 2AG

Mechanical

Process Entry: Threaded per chart
Conduit Entry: ½”NPT – plastic conduit
Transducer: PVC
Enclosure: PVC-94VO

Environmental

Temperature: -40 F to 140 F (Transducer and electronics)
Pressure: 15 PSI Max.
Area: ENTELA Certified #8294

  • CSA1010.1
  • UL 61010A-1
  • IEC 61010
Operational

Dead Zone/Range: Depends on model, see chart
Accuracy: +/- 0.25% of span
Lost echo hold time: 30 seconds/output 22mA or 2mA – User programmable

Specifications subject to change without notice

Model NumberOperating RangeOperating FrequencyMounting Thread
ABM300/400-45U 12" to 60" 45khz  3" NPT
ABM300/400-52U 11” to 50’ 52Khz 3”/2” NPT 
ABM300/400-70U 10” to 30’ 70Khz  2” NPT
ABM300/400-80U  8.5” to 20’  80Khz 2” NPT
ABM300/400-81U 7” to 16’ 81Khz 1.5" NPT
ABM300/400-148U   5” to 9’ 148Khz 1" NPT
Ordering Information
ABM200 = 2 Wire Loop Power
ABM300 = 3 Wire, DC Power
ABM400 = 4 Wire, AC Power

Example Part # - ABM300-70U

 

ABM Series Ultrasonic Level Transmitter

ultrasonic level transmitter