PART THREE - OPERATION
SECTION 4 - ANALYZER CONFIGURATION
Rev. 6-501
Model P53 pH/ORP Analyzer (universal-mount 1/2 DIN)
41
SET ISO POINT
(isopotential for special
Differential pH sensor)
☞
SET FILTER Time
This configuration setting only applies to GLI Differen-
tial pH sensors that contain a special “standard cell”
buffer.
GLI Differential pH sensors normally contain 7.00
pH “standard cell” buffer, providing a theoretical output of
zero mV at exactly 7.00 pH. This relationship is called the
“isopotential.” A sensor with the normal 7.00 pH isopotential
provides (-) 59.9 mV per pH at process values higher than
7.00 pH and (+) 59.9 mV per pH at process values lower
than 7.00 pH. Special applications may require the sensor
to have a special isopotential such as 6.50 pH. For best ac-
curacy, set the analyzer to match the isopotential value of
the special GLI Differential pH sensor.
NOTE:
Changing the isopotential setting always requires
you to re-calibrate the analyzer. When using a con-
ventional combination electrode, the isopotential
value is irrelevant and does not apply.
1.
With the
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6(/(&7 %8))(5
385( +2 &203
6(7 ,62 32,17
6(7 ),/7(5
38/6( 68335(66
(17(5 127(
7(03 (/(0(17
(;,7
screen displayed, use
Ø
Ø
key
to select the “SET ISO POINT” line.
2.
Press
ENTER key
to display a screen like
. Use
arrow keys
to adjust the dis-
played value to match the sensor’s isopotential, and
press
ENTER key
to enter the value.
A time constant (in seconds) can be set to filter or “smooth
out” the sensor signal. A minimum value of “0 seconds” has
no smoothing effect. A maximum value of “60 seconds” pro-
vides maximum smoothing. Deciding what sensor signal
filter time to use is a compromise. The higher the filter time,
the longer the sensor signal response time will be to a
change in the actual process value.
1.
With the
',63/$< )250$7
6(/(&7 %8))(5
385( +2 &203
6(7 ,62 32,17
6(7 ),/7(5
38/6( 68335(66
(17(5 127(
7(03 (/(0(17
(;,7
screen displayed, use
Ø
Ø
key
to select the “SET FILTER” line.
