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8.8.3 Procedure
1. Press PROG on the infrared remote controller (IRC).
2. Press NEXT until the ISOPOtntAL sub-menu appears. Press ENTER .
3. The screen displays the tCOEFF prompt. Use the editing keys to change the display
to the desired solution temperature coefficient. The allowed values are -0.044 to
+0.028 pH/°C. To enter a negative coefficient, press
Î or Í
until no digit is flash-
ing. Then press Ï or
Ð
to display the negative sign. Press ENTER to save.
4. The screen displays the ISO prompt. The number showing in the display is the oper-
ating isopotential pH. The transmitter calculates the operating isopotential pH from the
transmitter isopotential pH and the solution temperature coefficient. If the solution
temperature coefficient is 0.00, the operating isopotential pH is 7.00. If the solution
temperature coefficient is different from 0.00, the operating isopotential pH will be dif-
ferent from 7.00. It is ALWAYS better to enter the solution temperature coefficient as
described in step 3 and let the transmitter calculate the operating isopotential pH. To
move to the next prompt without changing the value, press NEXT .
5. The screen displays the Snr prompt. The flashing display is the current transmitter
isopotential point. Use the editing keys to change the transmitter isopotential pH to
match the sensor isopotential pH. The limits are pH 0.00 to pH 14.00. The default is pH
7.00. Press ENTER to save.
NOTE
Do NOT change the isopotential pH of the transmitter unless you are thor-
oughly familiar with the role of sensor and transmitter isopotential points
in pH measurement, OR unless the sensor operating instructions specif-
ically state that the isopotential pH is a value other than pH 7.
6. Press EXIT to return to the process display.
PROGRAM
Snr
EXIT NEXT ENTER
07.00
PROGRAM
ISOPOtntAL
EXIT NEXT ENTER
PROGRAM
tCOEFF
EXIT NEXT ENTER
0.000
PROGRAM
I S O
EXIT NEXT ENTER
07.00
MODEL 3081 pH/ORP SECTION 8.0
PROGRAMMING FOR pH MEASUREMENTS