Thermo Orion Star, Руководство пользователя

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VIII-7
Orion Star Series Meter
Thermo Electron Corporation
Dissolved Oxygen Technique
Calibrating with Water Saturated Air
The calibration function must be enabled in Setup before
the calibration is started .
1 . Prepare the calibration sleeve
*
by removing the reservoir
cap from the bottom of the sleeve . Remove the sponge
from the cap and saturate it with water . Squeeze all excess
water out of the sponge so that it is merely damp . Replace
the sponge into the cap and replace the cap onto the
calibration sleeve .
* A standard 300 mL BOD bottle may also be used for AIR calibration .
Fill the bottom of the bottle with 50 mL of distilled water . Be sure to
use the BOD funnel accessory (Orion Cat . Nos . 080360 or 080160,
depending on the probe in use) . Place the probe into the funnel
so that it is just above the stirring paddle . Ensure that there are no
drops of water on the surface of the membrane . Ensure that the
water level is 1/2 inch below the tip of the probe . Allow at least
30 minutes for the bottle to equilibrate .
2 . Place the dissolved oxygen probe into the calibration
sleeve . Ensure that the probe membrane does not come
into contact with the sponge in the calibration sleeve . Also
ensure that there are no drops of water on the membrane .
3 . Make sure Setup has calibration set .
4 . To initiate the Air calibration, press . The “cal” indicator
will light up .
5 . While the electrode signal is stabilizing, the meter will
flash a dissolved oxygen reading (based upon the current
calibration data) in the main field . Once the input has
stabilized, 102 .3 % saturation will be displayed for three
seconds . The meter will return to measure mode .