Continuous Level Measurement for Solid Material Applications
The UL-SLD ultrasonic sensor from ABM is the ideal solution for solid material level applications. The non-contact ultrasonic sensor provides continuous level measurement up to 100 ft (30.5 m) with 4-20 mA output standard and simple push-button calibration. The sensor can be factory configured for a variety of applications with battery supply (cellular modem), 2-wire loop-powered (HART) or 3-wire / 4-wire (RS232 or RS485) power and communication options, remote monitoring, and multiple range options.
Industries
Applications
- Process tank level and control
- Inventory level in storage tanks
- Bins, silos, tank or other vessel
- Overflow prevention
High Performance, Maintenance Free Ultrasonic Sensor.
- Self-adjusting sensor, automatically eliminates false echoes without user involvement
- Very uniform polar pattern, negligible side lobes
- Very uniform near field
- Very wide frequency bandwidth that produces uniform echoes, short ringing and wide temperature operation
- No influence from mounting, walls or internal obstructions on sensors performance
- No influence from temperature, pressure or humidity on measurement
- Automatically removes condensation and build-up from transducer face
- Non-contact and self-cleaning nature provides maintenance free operation
Technology Advantage
ABM’s self-adjusting ultrasonic sensors continually monitor conditions in the environment and automatically adjust the transmitted energy, transmitted pulse amplitude and it’s duration, and receiver sensitivity to match to the current tank conditions. This technique allows the receiver to detect only one echo from the measured media while all false echoes are pushed under the noise level and eliminated. The self-adjusting technique also gives the same amplitude of wanted echoes regardless of distance to the target. With one echo only, signal processing is very simple and the certainty of the measured echo being the target is 100%. This makes the ABM sensors very accurate and reliable. In addition, it enables very fast response (up to 20 echoes per second) for fast moving applications such as conveyor belts.
The sensors have very narrow and uniform polar patterns. ABM’s ultrasonic technology has a very wide frequency bandwidth that produces uniform echoes, short ringing, and wide temperature operation.
Operation is plug-and-play with ABM sensors. The self-adjusting nature means there is no need for mapping or profiling the environment or downloading several parameters. These signal process operations commonly used by other brands reduce the certainty in the measured materials level. ABM sensors are smart and automatically adapt without user involvement.
Technology: Ultrasonic
Measuring Range: Up to 100 ft (30.5 m)
Accuracy: +/- 0.10 % of maximum range (in lab using 4-20 mA current output). +/- 0.25 % of maximum range (typical in field)
Blanking Distance: 12″ – 16.8″ (range dependent – see table below)
Frequency: 25 or 45 kHz (range dependent – see table below)
Calibration: Push-button or programmable via communications port
Output: 4-20 mA output 6.1 uA resolution
Power Options: 12-30 VDC (2-wire loop-powered), 12-30 VDC (3-wire), 115 VAC (4-wire), 230 VAC (4-wire), 6-30 VDC (battery pack, cellular only)
Communication Options: HART 7, RS232, RS485 or Cellular Modem
Ambient Temperature: -40 to 60°C (-40 to 140°F)
Installation Category: Class II
Enclosure Material: PVC standard. Aluminum or SS316L optional (45 kHz only)
Protection Rating: IP68 (NEMA 6)
Transducer: PVC or Teflon
Process Connection: 1″ – 6″ NPT
Process Temperature:
-40 to 60°C (-40 to 140°F) with PVC transducer
-40 to 130°C (-40 to 266°F) with Teflon transducer
Process Pressure: ≤ 2 Bar (29 psi)
| Range Code | Range | Blanking | Frequency | Beam Angle | Resolution | Mounting |
| 045 | 1.0 - 60 ft / 0.30 - 18.2 m | 12" | 45 kHz | 9° | 0.27” / 6.8 mm | 3.0" NPT |
| 025 | 1.4 - 100 ft / 0.43 – 30.5 m | 16.8" | 25 kHz | 6° | 0.45” / 11.4 mm | 6.0" / 1.0" NPT |
