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The CS471 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 CS471 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.
Benefits 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 Detailed Description The CS471 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 CS471 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 CS471, 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 (see Ordering Info). The CS471, datalogger, and power supply must be housed in a desiccated environment, typically a Campbell Scientific enclosure. Hardware for mounting the CS471 to an enclosure backplate is shipped with the sensor. The CS471 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 General Resolution 0.003 ft /0.014 psi Power Requirements 10 to 30 Vdc Measurement Time 1 min Outputs SDI-12 (version 1.3) 1200 Baud, 4-20 mA, RS-484 (SDI-12 Protocol via RS-485 interface) Measurement Range 0 to 15.2 m (0 to 50 ft) Operating Temperature Range -20° to +60°C Storage Temperature Range -40° to +85°C Relative Humidity Range 10% to 95% RH (non-condensing) Accuracy ±0.003 m (0.01 ft) at 0 to 4.6 m (0 to 15 ft) ±0.065% of reading at 4.6 to 10.7 m (15 to 35 ft) ±0.006 m (0.02 ft) at 10.7 to 15.2 m (35 to 50 ft) Measurement/Communication Current (Typical) 320 mAh/day (1-minute query interval) 25 mAh/day (15-minute query interval) 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)
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Đo mực nước bằng bóng khí CS471
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