Thermo Fisher Scientific Alpha DO 500 User Manual

Page 25

Instruction Manual

Alpha DO 500

Press ENT key to confirm the reading.

NOTES:

x The transmitter proceeds to the second point of calibration

if the displayed reading is less than 10%

x The transmitter does not accept the calibration and shows

calibration error if the displayed (measured) value is more
than 10%

If the 0% calibration is successful, the Transmitter proceeds to the

second point. The lower display shows ‘100.0’. Take the electrode out of
0% oxygen solution, rinse in clean water, dry it and then allow the
electrode to equilibrate in air. The upper display shows the measured
value of dissolved oxygen saturation. Allow the reading to stabilize. LCD
shows ‘READY’ annunciator when the reading is stable.

Press ENT key to confirm the reading.

NOTE: The transmitter does not accept the calibration and shows

calibration error if the displayed (measured) value is not with
50% to 150%

The calibration is completed. The DO Transmitter reverts to

measurement mode.

NOTES:

x If the displayed value is more than r10% of the high-point value, the

Transmitter indicates a calibration error by showing ‘ERR’ and blinking

electrode annunciator. If this happens, press Ÿ and ź keys together
to return to measurement mode. Restart the calibration from Step1

x To exit from calibration mode without confirming calibration, press Ÿ

and ź keys together

x When calibrating with manual temperature compensation, the

Transmitter automatically changes from preset ‘process temperature’ to
‘calibration temperature’. After leaving calibration mode, the transmitter
switches back to the ‘process temperature’ (Refer section 5.4 for
temperature settings)