Electrode Stability Test Procedure - Thermo Scientific Orion Star A220 Series User Manual

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Electrode Stability Test Procedure

1. In the measurement mode, press the setup key.
2. Press the p, q, t or u key to highlight Diagnostics and press the f3 (select) key.
3. Press the p or q key to highlight Stability Test and press the f2 (select) key.
4. Press the p or q key to highlight pH–Channel, Conductivity–Channel or DO/RDO–
Channel and press the f2 (next) key.
5. Make sure the electrode or sensor to be tested is connected to the channel selected in the
previous step and press the f2 (yes) key.
6. Place the electrode or sensor in an appropriate solution with a stable temperature and
press the f2 (yes) key.
a. Thermo Scientific Orion pH 7.00 buffer (Catalog Number 910107, 910760 or 910710) is
recommended for testing a pH electrode.
b. Thermo Scientific Orion ORP standard (Catalog Number 967901 or 967961) is
recommended for testing an ORP electrode.
c. Thermo Scientific Orion 1413 µS conductivity standard (Catalog Number 011007 or
01100710) is recommended for testing most conductivity sensors. Thermo Scientific
Orion 100 µS conductivity standard (Catalog Number 011008) is recommended for
testing ultra pure water conductivity sensors.
d. A prepared water-saturated air calibration sleeve is recommended for testing RDO
optical and polarographic dissolved oxygen sensors.
7. The meter will perform the stability test and show the raw input reading per minute drift and
noise on the display.
8. The meter will display Stability Test Passed or Stability Test Failed. Press the f1 (esc) key
to return to the measurement mode.
Chapter 3
Orion Star A220 Series Portable Meter User Manual
Meter Setup Menus
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