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8
...4 Calibration
1-Point calibration (water-saturated air)
1 Using a customer-supplied calibration pot, place a wet
sponge at the bottom of the container.
2 Ensure the probe and sensing element are completely dry. If
necessary use a paper towel to remove any water or debris
from the sensor or sensing element.
3 Slide sensor into calibration chamber until the sensing
element is approximately 25 mm (1 in) above water-saturated
sponge.
4 Allow 5 to 10 minutes for temperature stabilization prior to
continuing the calibration procedure.
NOTICE
• Do not leave the sensor in the calibration chamber for
more than 30 minutes – this can allow condensation to
form on the surface of the sensing element, producing
false low readings after calibration.
• If condensation occurs, remove the sensor, thoroughly dry
the sensing element, probe and thermistor before
performing the calibration procedure.
• Ensure the calibrations are performed in a vented but
enclosed chamber, to prevent pressure building up in the
container.
• Minimize ambient airflow across the sensor head during
the calibration.
A D S 4 2 0 | D I S S O LV E D OX YG E N S E N S O R | O I/A D S 4 2 0 - E N R E V. B
5 At the transmitter perform a 1-point calibration from an
Operator page as follows:
7.62
25
Dissolved Oxygen
6 Press the
key (below the Cal prompt).
The Calibrate page is displayed:
Menu
Calibrate
Exit
7 Press the
key (below the Select prompt).
The Calibrate page is displayed with all available sensors
shown:
Calibrate
S1:
DO
Back
8 Use the
/
keys to select the sensor to be calibrated
key (below the Select prompt).
and press the
The Calibration Type page is displayed:
S1:
DO
Calibration Type
1-Point Cal
Next
2014–08–20
10:34:52
ppm
°C
CAL
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