FIGURE 7-4. Campbell Scientific bubble level properly mounted on top of
CS475A
5. Connect the sensor ground lug (
(p. 15)) to a local earth ground using at least a
14 AWG wire. Connection to a local earth ground provides better surge or electrostatic
discharge (ESD) protection than just grounding it via the sensor cable. While connected to
local earth ground, the energy will pass to the local ground instead of traveling through
the cable possibly damaging the electronics in the enclosure.
7.4 Determine and set reference stage
Change the reference stage setting at deployment. This setting allows the sensor to complete an
offset calculation. Every future measurement will use the offset and the current distance
measurement to calculate water stage or depth.
Using a staff plate or other physical datum, measure water level at the measurement site. Record
the measurement. Ensure that the measurement is in the same units as the sensor unit setting.
Default value is feet.
Enter reference stage using a terminal emulator (
Configuring sensor via extended SDI-12
commands and terminal emulator
(p. 21)).
CS475A Radar Water Level Sensor
16