Compact bubbler system

Part # ottcbs

ott cbs

The OTT CBS Compact Bubble Sensor is a compact, accurate, efficient, robust, and easy-to-use SDI-12 bubbler sensor for water level monitoring, which meets and exceeds USGS guidelines for accuracy. The CBS is low maintenance, with no desiccant required. A 5 year life is expected based on 1 minute intervals—no pump maintenance or lubrication required.

The OTT CBS is contained in a compact ABS plastic housing and all programming can be completed using DIP switches on the back of the unit; connect into existing platforms using 3/8” O.D. or 4mm O.D. measuring tube.

Perfect for remote applications that require low power, the CBS’s 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), saving on critical battery power.

What's the Easiest and Quickest Way to Start Collecting Data and Access it Anywhere?

The Answer's in the Cloud.

eTracker is a cellular modem and "virtual" cloud-based data logger in one (meaning you don't need to install a separate data logger). Simply connect your sensor and a power source to eTracker and you're done. Configure (or reconfigure) anytime from any Internet-connected device, and use Stevens-Connect to retrieve your data, or forward it to your favorite software system.

Technical Specifications

Measuring range

0-50 ft (0-15 m)

Standard accuracy

±0.02 ft

High accuracy version

0-15 ft: ±0.01 ft
15-50 ft: ±0.065% of reading or ±0.02 ft, whichever is less


0.003 ft / 0.014 psi


ft, psi, m, bar

Measuring interval

1 min to 24 hr

Max rate of level change

3 ft/min


SDI-12, 4-20 mA

Power supply

10-30 V DC

Power consumption

25 mAh/day @ 15 min. measurement intervals
320 mAh/day @ 1 min. measurement intervals

Compatible tubing

1/8 in., 2 mm or 4 mm ID

Temperature range

-4 °F to 140 °F (-20 °F to 60°C)


6.5 in. (L) x 8.1 in. (W) x 4.6 in. (H)


3.3 lbs.

Integrated purge function


Overload protection