69
68
The printer will print the pH calibration data.
The program function ends.
Changes in an electrode's performance can
be determined from this information.
The offset pH value should be between ±30 mV.
For values between ±30 and ±60 mV change
the reference electrolyte and repeat the cali-
bration procedure. For values higher than
+60 mV or lower than -60 mV the electrode is
no longer reliable. See the electrode mainte-
nance section on page 84.
The slope characteristic is in percentage of
the theoretical value of 58.16 mV per pH unit
at 20°C.
PROGRAM #4 (pH 302)
This program logs and prints pH/mV and
temperature values at a preset interval be-
tween 1 minute and 24 hours.
To enter the program press PGM and 4.
The printout defines functions 1, 2 and 3:
1 is a start time,
2 is the time interval,
3 is the finish time.
PROGRAM 3
DATE
2/04
TIME
14:04
OFFSET
mV 0.16
SLOPE
95.3%
MM/DD
HH:MM
in mV
in %
4
PGM
• After about 30 seconds enter the 2
nd
buffer
value at the working temperature and then
press ENTER. E.g. 9.33 (at 10°C).
The printer will print the 2
nd
buffer value.
• Press PGM to quit this pro-
gram.
• The calibration is now com-
plete.
PROGRAM #3 (pH 302)
This program prints the date, time, the offset
and slope characteristics of the pH electrode.
Note: the offset and the slope characteristics
of the electrode are referred to the last
performed pH calibration.
No programming is required.
Simply press PGM and 3.
9
.
3
3
ENTER/
PROGRAM 2
1 enter 1st buf-
fer
2 enter 2nd buf-
fer
1st buffer
6.92
2nd buffer
9.33
PGM
3
PGM