Instruction Manual Mi 190 DO Bench Meter
7
PROBE CONNECTION AND PREPARATION
To take measurements, connect the D.O. probe to the meter securely by aligning the
pins with the socket located on the back of the meter, pushing the plug in and tightening
the threaded ring.
Probes shipped from
Milwaukee
Instruments are dry. To hydrate the probe and
prepare it
for use, connect it to the meter and proceed as follows:
1. Remove the red and black plastic cap. This cap is for
shipping purposes and can be thrown away.
2. Wet the sensor by soaking the bottom 2½ cm (1") of
the probe in electrolyte (MA 9071) for 5 minutes.
3. Rinse the membrane cap (MA 841 supplied in the kit
with the meter) with electrolyte solution while shaking it
gently. Refill with clean electrolyte solution.
4. Tap gently the sides of the membrane cap with your
finger tip to ensure that no air bubbles are trapped. To
avoid damaging the membrane, do not tap it directly on
the bottom.
5. Make sure that the rubber O-ring sits properly inside
the membrane cap.
6. With the sensor facing down, slowly screw the cap
clockwise. Some electrolyte will overflow.
When not in use and during polarization (see page 8), use
the protective transparent cap supplied in the kit with the
meter.
Shipping
cap
black
red
FILL FIRST
THEN TAP
THEN SCREW
BACK ON
2 2
2 2
2 2
2 2
2 2
TEMPERATURE CALIBRATION (for technical personnel only)
The Mi 190
Mi 190
Mi 190
Mi 190
Mi 190 is factory calibrated for temperature.
Martini’s DO probes are interchangeable and no temperature calibration is needed when they
are replaced.
If the temperature measurements are inaccurate, temperature recalibration should be performed.
For an accurate recalibration, contact your dealer or the nearest
Milwaukee
Customer Service
Center,
or follow the instructions bellow.
• Prepare a vessel containing ice and water and another one containing hot water (at a
temperature of around 50 °C). Place insulation material around the vessels to minimize
temperature changes.
• Use a calibrated thermometer with a resolution of 0.1 °C as a reference thermometer.
• With the instrument off, press and hold down the LOG & MR keys, then power on the
instrument. The “CALIBRATION” tag will appear and the secondary LCD will show 0.0 °C.
• Immerse the temperature probe in the vessel with ice and water as near as possible to the
reference thermometer. Allow a few seconds for the probe to stabilize.
• Use the UP and DOWN arrow keys to set the reading on the secondary LCD to that of ice
and water, measured by the reference thermometer. When the reading is stable and close to
the selected calibration point, the “READY” and “ACCEPT” tags will blink.
• Press the ACCEPT key to accept the calibration point. The secondary LCD will show 50.0 °C.
• Immerse the temperature probe in the second vessel as near as possible to the reference
thermometer. Allow a few seconds for the probe to stabilize.
• Use the UP and DOWN arrow keys to set the reading on the secondary LCD to that of the
hot water, measured by the reference thermometer.
• When the reading is stable and close to the selected calibration point, the “READY” and
“ACCEPT” tags will blink.
• Press the ACCEPT key to accept the calibration point. The instrument returns to measurement
mode.
Note
Note
Note
Note
Note: If the reading is not close to the selected calibration point, “WRONG” tag will blink. Change
the temperature probe and restart calibration.
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