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3. STABILITY CRITERIA. For the Model 3081 pH/ORP transmitter to accept calibration
data, the pH must remain within a specified range for a specified period of time. The
default values are 0.02 pH units and 10 seconds. In other words, at the default setting,
calibration data will be accepted as soon as the pH reading is constant to within 0.02 units
for 10 seconds. The minimum range is 0.01, and the maximum time is 30 seconds.
8.7.3 Procedure
1. Press PROG on the infrared remote controller (IRC).
2. Press NEXT until the bUFFEr sub-menu appears. Press ENTER .
3. The screen displays the bAUTO prompt. Press Ï or
Ð
to activate (On) or deacti-vate
(OFF) auto calibration. Press ENTER to save.
4. The screen displays the bUFFEr prompt. Press Ï or
Ð
to select the desired buffer or
buffers. The buffer values available under each designation are given in Table 8-4.
Press ENTER to save.
TABLE 8-4. Standard and Technical Buffers Recognized by the 3081pH Transmitter
Std NIST, DIN 19266, JIS 8802, and BSM standard buffers
ErC Merck Buffers (technical buffers)
InG Ingold Buffers (technical buffers)
din DIN 19267 (technical buffers)
5. The screen changes to display the tIME prompt. Use the editing keys to change the
flashing number to the time in seconds the reading must remain stable for calibration
data to be accepted. The maximum is 30 seconds. Press ENTER to save.
6. The screen changes to display the pH prompt. Use the editing keys to change the
flashing display to the pH range the reading must remain in for calibration data to be
accepted. The minimum range is 0.01. Press ENTER to save.
7. Press EXIT twice to return to the process display.
Merck Ingold DIN 19267
pH temp (°C) pH temp (°C) pH temp (°C)
1.09 0 - 90
2.00 0 - 95 2.00 0 - 95
3.06 0 - 90
4.01 0 - 95
4.65 0 - 90
6.79 0 - 90
7.00 0 - 95 7.00 0 - 95
9.00 0 - 95
9.21 0 - 95 9.23 0 - 90
12.00 0 - 95
12.75 0 - 90
TABLE 8-3. pH values of commercial (technical) buffers and the
temperature range over which pH values are defined
PROGRAM
bAUtO
EXIT ENTER
On
PROGRAM
bUFFEr
EXIT ENTER
Std
PROGRAM
bUFFEr
EXIT NEXT ENTER
PROGRAM
t I M E
EXIT ENTER
1 0
PROGRAM
pH
EXIT ENTER
0
0.02
MODEL 3081 pH/ORP SECTION 8.0
PROGRAMMING FOR pH MEASUREMENTS