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Babbitt ABM Ultrasonic Level Transmitters
Babbitt International

ABM Series Ultrasonic Level Transmitter


The Babbitt ABM Series Ultrasonic Level Transmitter allows 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 surface of the liquid. The "round trip" transit time is then converted into the current output, which is directly proportional to the fluid level.
The circuit automatically filters out false echoes that may be produced by peripheral obstructions in the tank. For example, a pipe or ladder that is in the "ultrasonic cone" (but not directly in front of the transducer's face) will be ignored; the ABM Series has a proprietary circuit that locks onto the farthest echo which will always be the fluid level.
The current output (4-20mA) can power a load of up to 750 ohms. The Factory can supply digital readouts with optional setpoints for self-contained alarm/control systems.

  • Simple push-button calibration
  • Ignores peripheral obstructions
  • 4-20mA or 20-4mA output
  • Microprocessor-based reliability
  • Built-in temperature compensation
  • Current loop diagnostics
  • Field or bench calibration
Model Number Operating Range Operating Frequency Mounting Thread
ABM300/400-45U 12" to 60' 45 KHz 3" NPT
ABM300/400-52U 11" to 50' 52 KHz 3" / 2" NPT
ABM300/400-70U 10" to 30' 70 KHz 2" NPT
ABM300/400-80U 8.5" to 20' 80 KHz 2" NPT
ABM300/400-81U 7" to 16' 81 KHz 1.5" NPT
ABM300/400-148U 5" to 9' 148 KHz 1" NPT
Operation and Maintenance Manual
ABM Ultrasonic Level Range


A single push-button is used to set the point for 4mA and 20mA. The output may be either proportional (elevation) (4-20mA with zero=4mA at the bottom of the tank) or inversely proportional (depth) (20-4mA with 4mA=zero at the top of the tank). 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 ABM Ultrasonic Transmitter dimensions

Power (+/- 20%)

115VAC/60Hz; 230VAC/50Hz; 12-30VDC
Output 4-20mA or 20-4mA, 6.1uA resolution 750 ohms max load, Isolated with AC supply. Non-isolated with DC supply


0.125A/250V type 2AG

Process Entry:

Threaded per chart
Conduit Entry: 1/2" NPT, Plastic Conduit
Transducer: PVC
Enclosure: PVC 94VO
Temperature: -40F to 140F (transducer and electronics)
Pressure: 15 psig Max.
Area: CSA 1010.1; UL 61010A-1 & IEC 61010
Dead Zone: Model Dependent, see chart
Range: Model Dependent, see chart
Accuracy: +/-0.25" of Span
Lost Echo Hold Time: 30 Seconds
Temperature Compensation: In transducer
Specifications subject to change without notice

Babbitt Ultrasonic Transmitters

  Babbitt ABM-200, ABM-300 & ABM-400 Ultrasonice Level Transmitter
Code: BAABM200
Price: $850.00
Quantity in Basket: none

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