Campbell Scientific CS470/CS471 Compact Bubbler System - Manual (Page 22)

CS470/CS471 Compact Bubbler System
measuring tube for the required time period. The purge function can also be
activated via an SDI-12 command.
Press the membrane button for at least one second as otherwise the
error is called and displayed at the Status LED.
FIGURE 7-4. Purge Button and Status LED
7.7 Wiring
All electrical connections are made using two screw terminal strips (supplied)
at terminal blocks A and B on the underside of the CS470/CS471 (see FIGURE
7-5).
Although the CS470/CS471 has three interfaces available, our dataloggers
typically use SDI-12, and, therefore, only the SDI-12 connections will be
addressed here (for information about 4 to 20 mA communication, see
Appendix C).
It is recommended to power down your system before wiring the
CS470/CS471. SDI-12 communication only requires a four-wire connection
(see TABLE 7-2). Use CABLE4CBL-L 4-conductor 22 AWG cable.
The shield wire plays an important role in noise emissions and
susceptibility as well as transient protection.
NOTE
NOTE
12