EN
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10 STARTER 400D Portable DO Meter
4
OPERATION
WARNING Do not operate the equipment in hazardous environments. The
equipment is not explosion protected.
WARNING When using chemicals and solvents, comply with the instructions of the
chemical producer and the general lab safety rules.
4.1
Calibration
STARTER 400D
allows you to perform 1-point or 2-point calibrations; Ohaus suggest 1-point
calibration(100% DO calibration) for samples which DO value is not less than 2 mg/L.
Only when measure samples which DO value is lower than 2 mg/L, Ohaus suggest 2-point
calibration.
4.1.1
Zero-oxygen solution
Preparing a zero-oxygen solution: put approximately 20ml of pure or deionized water into the
bottle of DO Zero Oxygen Chemical (30059257, there are about 5g powder in it), stir for at least 5
minutes.
This zero-oxygen solution is used for 2-point calibration.
4.1.2
Performing 1-point calibration
When performing calibration, the meter only uses Auto End Point Mode.
1 point calibration can be performed in the air or oxygen-saturated water. There will be a little
difference between calibration in the air and in oxygen-saturated water.
Before calibration you need to rinse the DO probe with pure water and carefully wipe the water off
with a tissue.
o
Place the probe in the air (or in oxygen-saturated water).
o
Press
button-
, the calibration icon
appear on the display.
o
The meter reaches endpoints automatically, 100% will display. Measurement icon
disappears.
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