OTT Compact Bubbler Sensor (CBS)

Surface Water Level Sensor

Compact, accurate, robust, and easy-to-use SDI-12 bubbler sensor for water level monitoring.

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  • Accurate—Meets and exceeds USGS guidelines for water level accuracy, and will not drift over time
  • Complete Solution—Combining the CBS with an EPS-50 bubble chamber reduces the influence of wave action and prevents unnecessary noise in your data
  • Low Maintenance—No desiccant required; 5 year life expected based on 1 minute intervals—no pump maintenance or lubrication required
  • Easy-to-Start/Install—All programming can be completed using DIP switches; connect into existing platforms using 3/8′ O.D. or 4mm O.D. measuring tube (no adapters required)
  • Compact Size—Optimization of air volume required for measurement allows utilization of a small, but powerful spur gear
  • Low Power—Intelligent pumping strategy compares the previous measurement to the actual pressure at the current measurement, and optimizes the pumping time depending on the difference (i.e., small changes in level are measured with very short pump cycles)
  • Manual purge button easily accessed from the face of the unit, or purge function available via SDI-12 command
  • SDI-12 or 4-20 mA Output
  • Compatible with 12V or 24V applications
  • Overload protection powers the unit off if pressure or current is too high
  • No offset calibration required
  • All calibration data is stored on the pressure cell so field replacement is easily accomplished
  • Motor that fits into a compact package—no compressed gas tank is required
Measuring range: 0-50 ft (0-15 m)
Accuracy of pressure measurement: Standard 0-50 ft range version: ±0.02 ft

High accuracy 0-50 ft range version:

0-15 ft: ±0.01 ft, 15-35 ft: ±0.065% of reading, 35-50 ft: ±0.02 ft

Resolution: 0.003 ft / 0.014 psi
Units: ft, psi, m, bar
Measuring interval: 1 min to 24 hr
Max rate of level change: 3 ft/min
Output: SDI-12, 4-20 mA
Power supply: 10-30 V DC
Power consumption: 15 min. measurement interval 25 mAh/day
1 min. measurement interval 320 mAh/day
Compatible tubing: 1/8 in., 2 mm or 4 mm ID
Temperature range: -4 to 140°F (-20 to 60°C)
Dimensions: 6.5 in. x 8.1 in. x 4.6 in. (L x W x H)
Weight: 3.3 lbs.
  • Integrated purge function
  • Overload protection