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Install/Remove Guard or
Calibration Cup
Sonde guards protect EXO sensors from impact throughout deployment. Users should always install the guard
prior to data collection. e calibration cup (cal cup) is used for storage and calibration. We recommend
using two guards: one for eld deployments and a second used exclusively for calibrations. Using a second
guard will minimize calibration solution contamination (especially for turbidity) and calibration errors. EXO
calibration cups install over an installed sonde guard. is conguration reduces the amount of standards
required for calibration.
1 Install/remove sonde guard.
Install guard by threading it onto the sonde bulkhead
threads. Rotate the guard clockwise on the bulkhead to
install. Rotate it counterclockwise to remove. Always
use one guard for deployment/storage and the other for
calibration only.
Take care not to let the guard damage unguarded pH or
pH/ORP sensors when installing and removing.
2 Install/remove calibration cup.
Before installation, loosen (but do not remove) the
cup’s clamping ring. en, with the sonde guard already
installed, slide the cal cup over the guard until the bottom
of the guard rests against the bottom of the cal cup. Tighten
the ring until snug. To remove the cal cup, loosen the ring
by 1/4 turn and pull the guard free from the cup.
2.3
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