Note: Put the probe into an oxygen-scavenging solution (e.g., a 2% sodium sulfite for 5 minutes) to get a near-zero
DO solution.
1. Set the meter power to on.
2. Use the arrow keys to select the DO standard concentration.
3. Push ENTER to start the calibration.
Push CANCEL at any time during calibration to exit. The meter stops the current calibration and
keeps the old calibration data.
4. The DO value and "WAit" flashes until the calibration is complete.
5. The meter beeps three times when the first point of the calibration is complete.
6. If setup for a 1-point calibration, the meter shows the slope. Push DO or STORE to go to the
measurement mode.
7. If setup for a 2-point calibration, the next DO concentration value (specified in setup) and "CAL 2"
flashes.
8. Push ENTER to start the calibration. The DO value and "WAit" flashes until calibration is
complete. When the calibration is complete, the slope shows on the display.
9. To do only a 1-point calibration, push DO or STORE. The meter will accept just a 1-point
calibration and show the slope. If not, continue to the next step.
10. Push BAR to see barometric pressure. Push SAL to see the measured salinity adjustment, if a
conductivity (salinity) probe is attached. If no conductivity probe is attached, the manual salinity
compensation factor shows on the display.
Calibrate with an air-saturated method
Refer to Configure the meter on page 14 to set the calibration and measurement units to % or mg/L.
Do the operations in order:
1. Prepare the first standard. Put 1 cc of water in a narrow-necked bottle and shake vigorously.
2. Clean the probe tip dry, then put the probe in the bottle.
3. For a quick method: Wet the probe membrane with water, then hold the probe in the air with the
sensor pointed to the ground.
Note: Slope is the ratio of the actual mV output of the sensor as compared to the nominal sensitivity of 0.0 mV
at 0% saturation and 45.0 mV at 100% (i.e., 100% = 8.2 mg/L saturation at 25 °C at 1013.25 hPa barometric
pressure at 0 ppm salinity). 1 mg/L = 1 ppm. The nominal slope is 8.2 ppm/45mV or 0.1822 ppm per mV.
4. Set the meter power to on.
5. Push DO to put the meter in DO mode. The meter reads the DO value.
Push CANCEL during calibration to exit. The meter stops the current calibration and keeps the
old calibration data.
6. Put the probe in the first calibration solution or the saturated air bottle.
To erase all previous calibration points, slopes and offsets, push CAL, then DELETE.
To update a previous calibration with a 1-point calibration, ignore this step.
7. Push CAL, then the "CAL" icon flashes.
Maintenance
Replace the batteries
The display shows "bAt" when the batteries are too low to give a reliable measurement. The low
battery icon (refer to Display description on page 13) shows when there is approximately 25 hours of
battery power. Measurement errors are possible when the batteries are low. Refer to Install the
batteries on page 10 to replace the batteries.
Note: The date and time must be set again when the batteries are removed or are fully discharged.
Clean the instrument
Clean the exterior of the instrument with a moist cloth and a mild soap solution and then wipe the
instrument dry.
English 25
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