User Guide

6968
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