Thermo orion 410Aplus, Instruction Manual

Page: 53 / 129

Benchtop pH/ISE Meter Instruction Manual
Other Measurement Modes 52
E. Model 410Aplus Dissolved Oxygen Measurements
Dissolved Oxygen measurements are displayed in ppm when the Thermo
Orion Model 9708 Dissolved Oxygen Electrode (Cat. No. 970899) is used
with the Thermo Orion Model 410Aplus Meter. Perform the following
steps to prepare the meter and calibrate the electrode.
1. Connect the Model 9708 to meter and leave electrode mode
switch “OFF”.
2. Disconnect ATC probe.
NOTE: ATC probe must not be connected to the meter
and the meter should be calibrated to pH 7 at 25.0˚C.
3. Press mode until MEASURE is displayed, if not already displayed.
4. Turn the mode switch on the electrode to BT CK. Good battery
operation is indicated by a reading of 13.40 or greater on the meter.
5. Turn the mode switch on the electrode to ZERO. Use the zero
calibration control on the electrode to set the meter to read 0.00.
6. Insert the reservoir (funnel) into a BOD bottle, containing enough
water to just cover the bottom. Insert the electrode, making sure that
the electrode tip is not immersed in the water and does not have water
droplets clinging to the outside of the membrane. Let stand
approximately 30 minutes to ensure water saturation of air in the BOD
bottle. This bottle should be used for storage between measurements.
7. Turn the electrode mode switch to the AIR position. If measurements
are made at sea level, use the AIR calibration control on the
electrode to set the pH meter reading to the prevailing barometric
pressure in mm Hg (divided by 100). If the barometric pressure is
unknown, the elevation is above sea level or the sample has a
salinity greater than two parts per thousand, consult Table 1
found in the Model 9708 Instruction Manual to obtain the correct
AIR setting.
8. Turn the electrode mode switch to H
2
O for sample analysis.
9. Record direct ppm reading from meter.
F. Model 420Aplus, 710Aplus Dissolved
Oxygen Measurements
Dissolved Oxygen measurements are displayed in ppm when the Thermo Orion
Model 9708 Dissolved Oxygen Electrode (Cat. No. 970899) is used with the
Thermo Orion Model 420Aplus and 710Aplus Meters. Perform the following
steps to prepare the meter and calibrate the electrode.