Hach-Lange PHC805 User Manual - Manual (Page 3)

5. Add the filling solution to the probe as necessary (refer to Fill the probe
on page 11). The filling solution must be above the standard solution or the sample
level during measurement or calibration (
Figure 2 ).
6. Make sure that the filling hole is open during measurement for the correct flow of the
filling solution.
Note: For the best stabilization time, condition the probe for 2 hours in pH buffer 4.01 before use, if
the probe was not used for 3 weeks or more. In low ionic strength (LIS) samples, condition the
probe for a maximum of 5 minutes in the sample before use. In all other cases a condition before
use is not necessary.
Figure 2 Filling solution level
1 KCl crystals 1 3 Filling solution
2 Filling solution level 4 Standard solution or sample level
1 Red Rod probes only
Calibration
Before calibration:
The probe must have the correct service-life time stamp. Set the date and the time in the meter before the probe is attached.
It is not necessary to calibrate again if a calibrated probe is moved from one HQd meter to another. Make sure that the
additional meter is configured to use the same calibration options.
To view the calibration data, push , then select View Probe Data>View Current Calibration.
If two probes are connected, push the UP or DOWN arrow to change to the single display mode to show the Calibrate option
(available only on HQ40d and HQ440d meters).
Prepare the probe for use (refer to Preparation for use on page 2).
Calibration notes:
• Use buffers that are two pH units apart.
• Select additional standard sets with the minimum number of calibration points in the
Calibration Options. For a two-point calibration, select: one buffer with a pH above
and one buffer with a pH below the sample pH. For a one-point calibration, select the
buffer nearest to the sample pH.
• The calibration is recorded in the probe and the data log. Send the calibration to a
PC, a printer or a flash memory stick if connected.
3