10 ADS420 | DISSOLVED OXYGEN SENSOR | OI/ADS420-EN REV. B
…4 Calibration
2-Point calibration (100 % and 0 % saturation)
Note. This calibration procedure requires 60 mL (2.0 US fl oz)
of fresh sodium sulfite solution.
1 Using a customer-supplied calibration pot, place a wetted
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 probe or sensing element.
3 Slide probe 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 probe in the calibration chamber for
form on the surface of the sensing element, producing
false low readings after calibration.
• If condensation occurs, remove the probe, 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.
5 At the transmitter perform a 2-point calibration from an
Operator page as follows:
CAL
2014–08–20
10:34:52
7.62
25 °C
ppm
Dissolved Oxygen
6 Press the key (below the Cal prompt).
The Calibrate page is displayed:
Calibrate
Menu
Exit Select
7 Press the key (below the Select prompt).
The Calibrate page is displayed with all available sensors
shown:
Calibrate
S1: DO
Back
Select
8 Use the / keys to select the probe to be calibrated and
press the
key (below the Select prompt).
The Calibration Type page is displayed:
S1: DO
Next
Edit
Calibration Ty p e
2-Point Cal
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