Calibrating The Do 100% Saturation Point In Moist Air; Replacing The Optical Do Cap - palintest Macro 900 Operation Manual

Macro 900 Operation Manual
This value is not stored in memory so should be noted down in a calibration
record book for the probe. When the Cell offset voltage details have been noted
down, press OK then ESC repeatedly to return to normal reading mode.
If a problem occurs during calibration, an error message will be displayed.
Refer to Error! Reference source not found.
handling.
Remove the Probe from the calibration bottle, rinse thoroughly in fresh water,
shake off any excess and dry the outer sleeve with a soft cloth.

14.6. Calibrating the DO 100% Saturation Point in Moist Air

1. Wash the probe thoroughly in fresh water, then shake off ensuring there
are no droplets adhering to the DO membrane.
2. Moisten a clean cloth or piece of tissue paper with fresh water and wrap it
around the open end of the probe ensuring all the holes are covered.
Place the probe on a flat surface. Do not hold the probe, the heat from
your hands will warm the probe up and interfere with calibration.
3. Switch the Macro 900 Meter on and wait until the temperature
measurement is
4. Referring back to the screens shown in items 4 or 6 above (dependent on
software version), select DO100%
5. Wait while the Macro 900 Meter carries out the calibration procedure.
6. When calibration is complete, the Calibration Report will be displayed.
The top line will display a value which represents the health of the luminophore.
This value should be between 0.8 and 1.5 (at 25°C). If the value returned is
less than 0.8, the Optical DO Cap should be replaced. These values are not
stored in memory so should be noted down in a calibration record book for the
probe.
If a problem occurs during calibration, an error message will be displayed.
Refer to Error! Reference source not found.
handling.

14.7. Replacing the Optical DO Cap

The Optical DO Cap contains a lens, which is coated with an oxygen sensitive
luminophore, which is in turn coated with a black rubber compound that
provides optical isolation but is permeable to oxygen. Oxygen molecules pass
through the rubber into the luminophore.
of the DO electrode as the oils in your skin can block the pores in the
rubber coating and stop it from working correctly.
The luminophore within the DO Cap will need replacing every few years, as it is
a consumable item. Since the luminophore is an integral part of the DO Cap,
the entire DO Cap is replaced. An Optical DO Cap can last up to ten years
dependent upon the amount of use it gets. See
for further details.
© 2013 Palintest Ltd.
completely stable. This is very
www.palintest.com
in section 10 for error message
important.
in section 10 for error message
Never touch the black rubber end
Sensor Cap Life
V3
in Appendix 1
Page 46 of 147