Global Stability Indication; Temperature Compensation - palintest Macro 900 Operation Manual

Macro 900 Operation Manual
the variation over a ten second period drops below 1%.

6.3. Global Stability Indication

In addition to the individual trend indications, there is a global stability
indication, which is displayed when all readings are stable. This takes the form
of a flashing double headed arrow which is displayed at the start of the third
line of the display.
When taking a set of readings, gently stir the Probe, or raise and lower it in the
sample (if there is no natural water flow) until the global stability icon appears.
The initial display of the global stability icon will be accompanied by a double
beep. When this occurs, all values are stable and ready for reading or saving.

6.4. Temperature Compensation

The electrochemical properties of all solutions change with the solution's
temperature. In addition, the response of electrochemical measuring electrodes
change with temperature. It is a fundamental, practical requirement in the field
of water quality monitoring that test measurements taken at different
temperatures can be compared.
In order to facilitate this, the MAP 2000/2100 automatically applies corrections
for temperature wherever required.
During three point calibration of the ISE electrodes, the variation in response of
the electrodes due to temperature is automatically calculated. During
measurement, the variation in response of the electrodes due to temperature is
automatically compensated for.
During calibration of the EC electrode, the variation in the calibration buffer
solution due
measurement of EC, the readings can be displayed without any temperature
correction, corrected to 20°C, or corrected to 25°C. See section 9
Reference source not found.
During calibration of the DO electrode, variations due to temperature and air
pressure are automatically compensated for. During the measurement of DO,
temperature, air pressure and salinity are automatically compensated for.
During calibration of the ORP electrode, the variation in the calibration buffer
solution due
measurement of ORP however, temperature corrections are not applied as the
correction factors are matrix dependent and are not easily determined.
ORP potential measurements are mostly made to follow reactions rather than
for their own sake. The completion of an ORP reaction is normally accompanied
by a sharp change in the ORP millivolts reading. This change is usually much
larger than the errors induced by temperature side effects.
During calibration of the optical electrodes, variations in the calibration
solutions due to temperature are automatically compensated for. During the
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to temperature
for more details.
to temperature
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is automatically
is automatically
corrected for.
corrected for.
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