Thermo Fisher Scientific Alpha DO 500 User Manual

Page 22

Instruction Manual

Alpha DO 500

NOTE: The transmitter proceeds to the second point of calibration if the
displayed reading is less than 10% of the high-point value.

NOTE: The transmitter does not accept the calibration and shows
calibration error if the displayed (measured) value is more than 10% of
the high-point value.

If the low-point calibration is successful, the Transmitter proceeds to the

second point. The lower display shows ‘HI’. Take the electrode out of low
oxygen solution and immerse it in a higher dissolved oxygen
concentration (8.24 mg/l) solution.

The upper display shows the measured value of dissolved oxygen of the
solution. Allow the reading to stabilize. LCD shows ‘READY’ annunciator
when the reading is stable.

Press Ÿ or ź key to adjust the reading to 8.24 mg/l. The Transmitter
allows adjusting up to

r50% of the measured value.

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 more than
50% of the high-point value.

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)