VII-5
Orion Star Series Meter
Thermo Electron Corporation
pH Technique
pH Measurements
1. Rinse the electrode, as well as ATC probe and stirrer if being used, in deionized
water. Blot dry with a lint-free tissue. Do not wipe glass electrodes as static
charge will build up on the sensor.
2. Place the electrode in your sample.
a. If you are in continuous measurement mode, the instrument will start
measuring immediately. If you are using the benchtop meter & the stirrer
control is enabled then pressing will start the stirrer.
The
will flash until the reading is stable. Once the reading is stable you
can Log & Print the measurement by pressing the . If you are recording
the data into a notebook, record the pH as well as the temperature at which
the pH reading is taken. If the stirrer is in motion, press to turn off the
stirrer before removing the stirrer from the sample.
b. If you are in AUTO-READ™ mode then press
to start the measurement.
Once the reading is stable the meter will automatically Log & Print the
results and freeze the display. If the stirrer is enabled, then the stirrer will
turn on when is pressed and turn “off” once the reading has stabilized.
When using the AutoStir™ BOD Probe, pressing the button on the probe will
start the AUTO-READ measurement.
c. If you are in Timed Measurement mode then the meter will start making
measurements as soon as it goes into measurement mode at the frequency
selected in setup. It will automatically Log & Print each measurement. If
you are using the benchtop meter and the stirrer control is enabled then
pressing will start the stirrer. Pressing again will turn off the stirrer.
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