Orion Benchtop pH/ISE Meter Instruction Manual
Other Measurement Modes
53
1. Connect the Orion 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 the pH mode indicator is displayed.
4. If on, turn the hold feature (1-2 in the setup menu) off.
5. Press measure. Using or change the temperature value to 25.0˚C.
6. Press 2nd then cal. Enter the value 7.00 and press yes.
7. Press measure. The slope prompt, SLP, will be displayed in the
lower field. Enter 100.0 and press yes. The meter automatically
enters the measure mode.
8. 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.
9. 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.
10. 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.
11.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 Orion 9708
Instruction Manual to obtain the correct AIR setting.
12. Turn the electrode mode switch to H
2
O for sample analysis.
13. Record direct ppm reading from meter.
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