Accumet AP71, Руководство по эксплуатации

Страница: 8 / 24

1.
If necessary, press the MODE key to
select pH mode
. The pH indicator
appears in the upper right hand corner
of the display.
See figure
2.
Rinse the probe thoroughly with
de-ionized water or a rinse solution.
Do
not wipe the probe; this causes a build-up
of electrostatic charge on the glass surface.
3.
Dip the probe into the calibration buffer.
The end of the probe must be completely
immersed into the sample. Stir the probe
gently to create a homogeneous sample.
4.
Press CAL/MEAS to enter pH calibration
mode. The CAL indicator lights. The
primary display will show the measured
reading while the smaller secondary dis-
play will indicate the pH standard buffer
solution.
See figure
5.
Wait for the measured pH value to
stabilize.
See figure
15 14
6.
Press ENTER to confirm calibration .
The meter is now calibrated to the
current buffer.
See figure
• If you are performing multipoint
calibration, go to step 7.
• If you are performing one-point
calibration, go to step 9.
7.
Rinse the probe with de-ionized water
or a rinse solution, and place it in the
next pH buffer.
8.
Follow steps 5 to 8 for additional
calibration points.
9.
When calibration is complete,
press CAL/MEAS to return to pH
measurement mode
.
Notes
To exit from pH Calibration mode without
confirming calibration,
DO NOT press
ENTER in step 6. Press CAL/MEAS instead.
If the selected buffer value is not within
±1.0 pH from the measured pH value: the
electrode and buffer icon blink and the ERR
annunciator appears in the lower left corner
of the display.
To limit the number of pH buffer values
available during calibration, see section P4.2
on page 33.
D
C
D
B
C
B
A
A
pH calibration
NOTE: We recommend that you perform at least a 2-point calibration using standard
buffers that bracket (one above and one below) the expected sample range.
You can perform a 1-point calibration, but make sure that the buffer value is
close to the sample value you are measuring.
4.3
C
If the READY indicator has been activiated
(set up program P4.1—see page 32), the READY
annunciator lights when the reading is stable.