7.2.2 Signal cables
Maximum cable length
Please consider the maximum cable lengths for the applied transmission protocol:
Protocol
Max. cable length [m]
SDI-12
60
RS-485
300
Table 1
Maximum cable lengths
NOTE
Cable lengths longer than 60 m require a heavier gauge wire if the
power supply drops below 11 V.
7.2.3 Lightning protection
If the underground at the measurement site permits sufficient current dissipation it is strongly recom-
mended to equip the sensor support or mast with properly dimensioned lightning protection. Consult
an expert for advice.
The USH-9 is protected against overvoltage. If a data logger is mounted to the mast, its ground lug
must be properly connected to earth ground.
7.3
Required tools and equipment
Prepare the following tools and equipment to install the USH-9:
Qty
Tool
1
Mounting tube Ø32...60 mm
1
Flat spanner 13 mm
1
Wire cutter
several
Cable ties
7
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