VII-3
Orion Star Series Meter
Thermo Electron Corporation
pH Technique
pH Calibration for 1-5 Points
The calibration points should bracket the expected pH range of the samples to
be measured. Calibration points should be not less than 1 pH unit apart and not
greater than 4 pH units apart.
It is recommended that a two buffer calibration, using buffers that bracket the
expected sample range, be performed at the beginning of each day to determine the
slope and offset of the electrode. This step will also compensate for any changes in
the electrode and determine if it is working properly. For optimal accuracy perform
a one buffer calibration every two hours to compensate for electrode drift using a
fresh aliquot from one of the buffers used in the initial calibration.
Fresh buffers should be used each time you calibrate.
Care should be taken when rinsing the electrode with deionized water and gently
blotting all remaining water drops with a lint-free tissue prior to moving the
electrode to the next beaker. DO NOT wipe a glass or epoxy electrode body with a
tissue as static build up will result.
1. Prepare the electrode for use according to the instructions received with the
electrode.
2. In setup mode select the buffer set of NIST (
) or DIN ( ) being used
for the proper buffer recognition to occur.
3. Press
until the arrow icon is pointing to the pH measurement line.
4. Press
.
5. Rinse the electrode and ATC probe and place into the buffer.
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