Hanna Instruments HI 84500 - Manual (Page 28)

28
ORP MEASUREMENT
The HI 84500 can be used as an ORP meter for direct measurements.
Set the instrument to ORP meter. From titrator mode press Meter until mV units are displayed.
Rinse the ORP tip with distilled or deionized water.
Place ORP electrode into electrode holder.
For a faster response and to avoid cross-contamination of the samples, rinse the electrode tip
with a few drops of the solution to be tested before taking measurements.
Immerse the ORP sensor in the sample until the PTFE reference junction is completely
submerged and stir gently for a few seconds.
When the reading becomes stable the
(unstable measurement) symbol will disappear.
If the potential reading is less than -2000.0 mV or greater than 2000.0 mV the closest full-scale
value will be displayed blinking.
Press MENU then GLP.
The pump’s last calibration time, date and slope is displayed.
If a calibration hasn’t been performed, the message “Not Calibrated” will be displayed.
TITRATOR GLP INFORMATION