Overview
The CBS is a high-accuracy bubbler (±0.02 ft) that generally measures ground or surface water level, but can also measure any liquid level. A Campbell Scientific datalogger controls the CBS pump and calculates the measurements. This compact bubbler typically communicates with the datalogger via the SDI-12 protocol. Many of our dataloggers support SDI-12.
Read MoreBenefits and Features
- Ideal for areas where submersed sensors can be damaged due to corrosion, contamination, flood-related debris, lightning, or vandalism
- Compatible with most Campbell Scientific dataloggers
- Easy to maintain
- Robust pump design provides reliable operation
- Consistent accuracy ensured by drift-free measurements and offset compensation using relative measurement
- Purge function clears the measuring tube and the bubble chamber of contamination
- Does not use pressurized nitrogen tank—requiring less frequent attendance
- Existing tubes can be used
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Detailed Description
The CBS contains a piston pump that compresses air. The compressed air flows through a measuring tube into the water being measured. The pressure created in the measuring tube is directly proportional to the water column above a bubble chamber. The CBS measures both barometric pressure and bubble pressure, one after the other. The height of the water above the bubble chamber is then calculated by taking the difference between the barometric and bubble pressure measurements.
To use the CBS, the acquisition system must include the measuring tube, a bubble chamber, power supply, datalogger, and datalogger-connection cable. Campbell Scientific offers the measuring tube, bubble chamber, and cable as Common Accessories. The CBS, datalogger, and power supply must be housed in a desiccated environment, typically a Campbell Scientific enclosure. Hardware for mounting the CBS to an enclosure backplate is shipped with the sensor.
The CBS can communicate via SDI-12, 4 - 20 mA, or RS-485 (SDI-12 protocol via a physical RS-485 interface). SDI-12 is the preferred protocol when using Campbell Scientific dataloggers. Many of our dataloggers support SDI-12.
Specifications
- Resolution: 0.003 ft /0.014 psi
- Power Requirements:
10 to 30 Vdc - Measurement Time: 1 minute
- Outputs: SDI-12 (version 1.3) 1200 Baud, 4-20 mA, RS-484 (SDI-12 Protocol via RS-485 interface)
- Measurement Range: 0 to 50 ft
- Operating Temperature: -20° to 60°C
- Storage Temperature: -40° to 85°C
- Relative Humidity Range: 10% to 95% RH, non-condensing
- Maximum Tube Length: 100.6 m (330 ft)
- Electronics Box Dimensions:
16.5 x 20.5 x 11.5 cm
(6.5 x 8.1 x 4.5 in.) - Weight: 1.5 kg (3.3 lb)
Accuracy
- 0 to 15 ft: ±0.01 ft
- 15 to 35 ft: ±0.065% of reading
- 35 to 50 ft: ±0.02 ft
Measurement/Communication Current (typical)
- 1-minute Query Interval: 320 mAhr/day
- 15-minute Query Interval: 25 mAhr/day
Compatibility
Datalogger Considerations
Compatible Contemporary Dataloggers
| CR200(X) Series | CR800/CR850 | CR1000 | CR3000 | CR5000 | CR7X | CR9000X |
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Compatible Retired Dataloggers
| CR500 | CR510 | CR10 | CR10X | 21X | CR23X | CR9000 |
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