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Figure 35. YSi Probe.
Avoid touching the sensing end of the sensor cap during the following maintenance procedures.
•
Remove the stir paddle from the probe by pulling it straight out.
•
Remove the old sensor cap from the probe by grasping the probe body with one hand and then rotating the sensor cap counterclockwise
until it is completely free. Do not use any tools.
•
Without the use of tools, carefully remove the O-ring and discard it.
•
Clean the O-ring seal on the probe by first wiping off the old 0-ring lubricant with a dry lens cleaning tissue. Next, clean any build-up with
a water-moistened lens tissue, and then dry with another lens tissue.
•
Locate the O-ring supplied in the Sensor Cap replacement kit and install it on the probe. Do not use any tools to replace the 0-ring, be
careful not to touch the clear optical DO sensor window. After installing the 0-ring, ensure it is clean and free of fingerprints. If necessary,
wipe clean with a lens tissue.
•
Locate the O-ring lubricant included with the new sensor cap. Apply a thin coat of it to the installed O-ring. There should be a thin coat of
lubricant on the O-ring only. Remove any excess lubricant from the O-ring and for probe with a lens tissue.
•
Clean the clear surface of the optical DO sensor window with a lens cleaning tissue.
•
Remove the new sensor cap from its hydrated container and dry the inside cavity of the sensor cap with lens tissue. Make sure that the
cavity is completely dry and clean before proceeding with the installation. Using a clockwise motion, thread the new sensor cap onto the
probe assembly until it is tight. The 0-ring should be compressed between the sensor cap and the probe. Do not over-tighten the sensor
cap and do not use any tools during installation.
•
Clean the stir paddle and then re-install it on the probe by pushing it straight into place.
•
Store the sensor in a BOD bottle with a small amount of water (approximately 40 ml).
•
Follow the procedures below for configuring the ProODO instrument for the new Sensor Cap's coefficients.
8.2.1.3 Configuring the
BOD-300
for the new sensor cap
When receiving and installing a new Sensor Cap, locate the Calibration Code label at the top of the Sensor Cap instruction sheet and note
the six codes which are listed as k1to k5 and kC. These six numbers contain the calibration code specific to the sensor cap that was just
installed. After installing a new sensor cap, go to the “
utilities
” tab of the
BOD-300
software, press New Sensor Cap. Enter the six
numbers of the calibration code, separated by the semicolon “;”, then press "Ok".
CAUTION