Instruction manual

Thermo Scientific Alpha pH 560 16
Chapter 4
Calibration Mode
Before starting calibration, make sure that the pH Controller is in
appropriate measurement mode (pH or ORP). When the Controller is
switched on, it starts up with the measurement mode last used. For
example, if the pH Controller is switched off in ORP measurement
mode, it starts up in ORP mode when it is switched on. (Refer Page 5.7
for switching measurement modes)
Be sure to remove the protective electrode storage bottle or rubber cap
of the electrode before calibration or measurement. If the electrode has
been stored dry, wet the electrode in tap water for 10 minutes before
calibrating or taking readings to saturate the pH electrode surface and
minimize drift.
Rinse the electrode in de-ionized water after use, and store in electrode
storage solution. If storage solution is not available, use pH 4.01 or 7.00
buffer solution.
Do not reuse buffer solutions after calibration. Contaminants in the
solution can affect the calibration, and the accuracy of the
measurements.
The pH Controller features two internationally recognized pH buffer
standards. Select the buffer standard you require in the setup mode.
(Refer Page 5.6) Available buffer options are:
• USA buffers --- pH 4.01, 1.68, 7.00, 10.01 and 12.45
• NIST buffers --- pH 4.01, 1.68, 6.86, 9.18 and 12.45
While in measurement mode, press the CAL key to access calibration
mode. LCD indicates ‘CAL PH’ (when measurement mode is pH) or
‘CAL OrP’ (when measurement mode is ORP).
Figure 4–14. Entering Calibration Mode
Preparing the
Controller &
Electrode for
Calibration
Entering pH/ORP
Calibration
Mode