Campbell-scientific CS470/CS471 Compact Bubbler System Manuel d'utilisateur télécharger pdf (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

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Campbell-scientific CS470/CS471 Compact Bubbler System Manuel d'utilisateur Page 22