Instruction Manual Mi 190 DO Bench Meter
11
D.O. CALIBRATION
Calibrate the instrument frequently, especially if high accuracy is required.
The instrument can be calibrated in maximum 2 points: 0.0% (zero calibration
zero calibration
zero calibration
zero calibration
zero calibration) and
100.0% (slope calibration
slope calibration
slope calibration
slope calibration
slope calibration).
The zero calibration of the Mi 190
Mi 190
Mi 190
Mi 190
Mi 190 is very stable, therefore this procedure needs to be
performed only whenever the probe or the membrane is replaced.
However, because the slope calibration is more critical, it is recommended to perform this
procedure every week.
INITIAL PREPARATION
• Pour small quantities of MA 9070 Zero Oxygen solution into a
beaker. If possible, use a plastic beaker to minimize any EMC interfer-
ences.
• Make sure the probe is ready for measurements (see probe prepara-
tion on page 7), i.e. the membrane is filled with electrolyte and the
probe is connected to the meter.
• Switch the meter on by pressing the ON/OFF switch.
• For an accurate calibration, it is recommended to wait for at least
15 minutes to ensure precise conditioning of the probe.
• Remove the protective cap from the D.O. probe.
• Set the appropriate altitude factor (see page 21). Make sure the
salinity factor is set to zero (see page 20).
ZERO CALIBRATION
• Submerge the probe into MA 9070 zero oxygen solution and stir
gently for 2-3 minutes.
MI9070
MI9070
1 8
1 8
1 8
1 8
1 8
SETUP
Setup mode allows viewing and modifying the following parameters:
• Salinity Compensation
• Altitude Compensation
• Current Time (hh:mm)
• Current Date (MM.DD.YYYY)
• Beep Status
• Baud Rate (serial communication)
• Instrument ID
• Temperature Unit
To enter SETUP mode, press and hold the SETUP key for about 1 second while in normal
measurement mode.
Select the desired setup parameter using the UP and DOWN arrow keys.
Press the CAL key if you want to change the item value. The selected item (e.g. hour, in setting
up the correct time) and “ACCEPT” tag will start blinking.
Press the arrow keys to change the displayed value.
If there is another item to be set (e.g. minutes), press the RANGE key. The other item will start
blinking.
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