Campbell Scientific CS470/CS471 Compact Bubbler System - Manual (Page 15)

CS470/CS471 Compact Bubbler System
7. Select any other sensors you have, then finish the remaining Short Cut
steps to complete the program. The remaining steps are outlined in Short
Cut Help, which is accessed by clicking on Help | Contents |
Programming Steps.
8. If LoggerNet, PC400, or PC200W is running on your PC, and the PC to
datalogger connection is active, you can click Finish in Short Cut and you
will be prompted to send the program just created to the datalogger.
9. If the sensor is connected to the datalogger, as shown in the wiring
diagram in step 6, check the output of the sensor in the datalogger support
software data display to make sure it is making reasonable measurements.
5. Overview
The CS470 and CS471 use the air bubble principle for measuring liquid level.
Generally, they measure ground or surface water level, but any liquid level can
be measured. Typical applications include agricultural water level/flow, water
wells, lakes, streams, and tanks. The CS470 and CS471 differ only in their
measurement accuracy.
Compressed air produced by a piston pump flows via a measuring tube into the
water to be measured. The pressure created in the measuring tube is directly
proportional to the water column above the bubble chamber. The
CS470/CS471 determines the barometric air and bubble pressure one after the
other. By taking the difference between the two signals, the CS470/CS471
calculates the height of the water level above the bubble chamber.
The CS470/CS471 contains a purge function. This clears the measuring tube
and the bubble chamber of any minor contamination by pumping a large
volume of air into the measuring tube.
By using an intelligent pump strategy, no air drying unit is necessary.
The CS470/CS471 has three communication options: SDI-12, 4 to 20 mA, or
RS-485 (SDI-12 protocol via a physical RS-485 interface). As an SDI-12
sensor, the CS470/CS471 is shipped with an address of 0.
The CS470 and CS471 are manufactured by OTT as model CBS.
6. Specifications
Features:
• Ideal for areas where submersed sensors can be damaged due to
corrosion, contamination, flood-related debris, lightning, or
vandalism
• 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
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