Hach-Lange HQD - Gel filled ORP_Redox electrode MTC - Manual (Page 3)

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Calibration
Calibration notes
• Probes are initially calibrated at the factory. However, regular calibration by the user is
recommended for best measurement accuracy.
• Additional standards can be selected in the MTC101 Calibration Options.
• ZoBell’s redox potential is temperature dependent. The HQd calibration routine
factors in this temperature dependency allowing accurate calibrations within the
temperature range of 0 - 30 ºC. Light’s solution should be read @ 25 ºC. Custom
ORP/Redox calibration solution values and temperature are user defined.
• The calibration is recorded in the electrode and the data log. The calibration is also
sent to a PC, printer or flash memory stick if connected.
Before calibration:
The probe must have the correct service-life time stamp. Set the date and time in the meter before attaching the probe.
It is not necessary to recalibrate when moving a probe from one HQd meter to another if the additional meter is configured to
use the same calibration options. If the additional HQd meter uses different calibration options (e.g. standard calibration
routine), calibrate the probe or change the method settings/select a different method.
To view the current calibration, select DATA LOG KEY, View Probe Data, then 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.
ORP/Redox standards should not be diluted. Always use fresh ORP/Redox standard for calibration.
Stir gently. Avoid resting the electrode on the bottom or sides of the container.
Refer to the troubleshooting section for calibration errors ( Troubleshooting on page 13 ).