11
PROBE CONDITIONING
Probe polarization is essential for stable, accurate measurements. Probe polarization ensures the
electrodes are conditioned and any oxygen dissolved in the electrolyte is consumed, so the only oxygen
present will be oxygen diffusing from sample across the PTFE membrane. It is recommended to wait
for at least 15 minutes to ensure precise conditioning of the probe.
When the probe is properly polarized, dissolved oxygen is consumed as it passes through the PTFE
membrane into the electrolyte at the platinum cathode, and an accurate DO reading is displayed.
When the probe is not polarized, oxygen from the test solution as well as oxygen present in the
electrolyte solution are detected, resulting in an incorrect DO reading.
INITIAL PREPARATION
The instrument is supplied complete with batteries. See Batteries Replacement for details, page 59.
To prepare the instrument for field measurements close the USB communication socket and all unused
connector sockets with proper stopper (to ensure waterproof protection).
Connect the DO probe to the 7‑pin connector. Make sure that the probe sleeve is properly inserted
and tighten the threaded ring.
Turn the instrument ON by pressing ON/OFF key.
At start‑up the display will show the Hanna logo for a few seconds, followed by the percentage indication
of the remaining battery life, then enters the probe conditioning mode. The probe will be conditioned
for one minute, and afterwards the instrument will enter measurement mode.
If the DO probe is not connected or is damaged, the conditioning period is skipped.
To save battery life, the Auto Power Off feature turns the instrument off after a set period (default 30 min)
if no button is pressed. To set another period or to disable this feature, see SETUP menu on page 30.
The Auto Light Off backlight feature turns the backlight off after a set period (default 1 min) with no
buttons pressed. To set another period or to disable this feature, see SETUP on page 30.
OPERATIONAL GUIDE
To Next Page
Loading...
Need help?
General
