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14 OI/ADS430–EN Rev. A | Aztec ADS430 | Optical dissolved oxygen probe
6.3 2-Point calibration (100 % and 0 % saturation)
1. Perform a 1-point calibration.
Referring to Fig. 6.2:
2. Remove storage cap
A from the top of calibration
chamber
B.
3. Place sponge wafer
C in the bottom of calibration
chamber
B and saturate with approximately 10 ml
(0.34 fl oz [US])) of water.
4. Fit vented calibration cap
D to the top of calibration
chamber
B.
5. 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.
6. Slide probe E into calibration chamber B until the
sensing element is approximately 25 mm (1 in.) above
water-saturated sponge
C.
7. Allow 5 to 10 minutes for temperature stabilization prior to
continuing the calibration procedure from step 8 onwards.
8. At the transmitter perform a 2-point calibration from an
Operator page as follows:
9. Press the key (below the Cal prompt).
The Calibrate page is displayed:
10. Press the key (below the Select prompt).
The Calibrate page is displayed with all available
sensors shown:
IMPORTANT (NOTE) This calibration procedure
requires 60 ml (2.0 fl oz [US])) of fresh sodium
sulphite solution.
Fig. 6.2 1-Point calibration
25 mm
(1.0 in.)
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.
CAL
2014–08–20
10:34:52
7.62