PART THREE - OPERATION
SECTION 4 - ANALYZER CONFIGURATION
Model P53 pH/ORP Analyzer (universal-mount 1/2 DIN)
Rev. 6-501
40
Select
PURE H2O COMP (only
for special applications)
☞
☞
When using the analyzer to measure ORP, this function
is not provided.
When measuring pH in solutions with the
weakly dissociating electrolytes ammonia or morpholine,
built-in tables provide a correction factor for pure water
temperature compensation. This special compensation is
specifically for use in power plant applications. It adds an
associated temperature-dependent offset, from the selected
table, to the measured pH. If a custom compensation is re-
quired for pure water applications, a “user-defined” pH/
°
C
linear slope factor can be applied to the measured pH.
NOTE:
The selected pure water temperature compensation
is limited to 50
°
C. If the process temperature is
higher, the offset corresponding to 50
°
C is used.
1.
With the
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screen displayed, use
Ø
Ø
key
to select the “PURE H2O COMP” line.
2.
Press
ENTER key
to display
.
3.
With the “SELECT TYPE” line selected, press
ENTER
key
to display a screen like
. Use
Ø
Ø
and
×
×
keys
to view the choices (NONE, AMMONIA,
MORPHOLINE or USER DEFINED).
4.
With the desired choice displayed, press
ENTER key
to
enter this selection. When “USER DEFINED” is se-
lected, you must set the specific pH/
°
C linear slope:
A.
With the
screen displayed, use
Ø
Ø
key
to select the “SET SLOPE” line.
B.
Press
ENTER key
to display a screen like
. Use
arrow keys
to adjust to ad-
just the displayed value to the desired slope, and
press
ENTER key
to enter the value.
NOTE:
The MEASURE screen will show an asterisk after
the pH reading to indicate pure water temperature
compensation if it was selected.
