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Macro 900 Operation Manual
V3
© 2013 Palintest Ltd.
www.palintest.com
Page 47 of 147
Caution: The inside of the Optical DO Cap is very sensitive to light and can be
ruined (bleached) if it is exposed to bright light for any length of time.
Never
remove the Optical DO Cap from the Probe unless you intend to replace it with
a new one.
When replacing an Optical DO Cap, do so under subdued light.
To replace the Optical DO Cap, follow these simple steps.
1.
Remove the Probe sleeve.
2.
Unscrew the Optical DO Cap from the end of the DO/EC electrode by
rotating it anti-clockwise.
Do not touch the exposed optical components.
3.
Apply a light smear of silicone grease to the thread and O ring.
4.
Remove the new Optical DO Cap from its light-proof bag and quickly
screw it onto the end of the DO/EC electrode. Ensure that the cap is
screwed fully onto the electrode and that it is done up tight.
5.
Carry out both Zero point and 100% point DO calibration as described
earlier.
Please Note: It is essential when replacing the Optical DO Cap to
calibrate the Zero point BEFORE calibrating the 100% point.
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