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12 OI/ADS430–EN Rev. A | Aztec ADS430 | Optical dissolved oxygen probe
6.2 1-Point calibration (water-saturated air)
Referring to Fig. 6.1:
1. Remove storage cap
A from the top of calibration
chamber
B.
2. Place sponge wafer
C in the bottom of calibration
chamber
B and saturate with approximately 10 ml
(0.34 fl oz [US]) of water.
3. Fit vented calibration cap
D to the top of calibration
chamber
B.
4. 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.
5. Slide probe E into calibration chamber B until the
sensing element is approximately 25 mm (1 in.) above
water-saturated sponge
C.
6. Allow 5 to 10 minutes for temperature stabilization prior to
continuing the calibration procedure from step 7 onwards.
7. At the transmitter perform a 1-point calibration from
an Operator page as follows:
8. Press the key (below the Cal prompt).
The Calibrate page is displayed:
9. Press the key (below the Select prompt).
The Calibrate page is displayed with all available
sensors shown:
10. Use the / keys to select the probe to
be calibrated and press the key
(below the Select prompt).
The Calibration Type page is displayed:
IMPORTANT (NOTE)
— Do not leave the probe 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 probe,
thoroughly dry the sensing element, probe and
thermistor before performing the calibration
procedure.
Fig. 6.1 1-Point calibration
25 mm
(1.0 in.)
CAL
2014–08–20
10:34:52
7.62