Figure 6.
6.1.2
Temperature Compensation
The displayed conductivity value is automatically compensated to the nominal value at the reference tem-
perature 25 °C using the sample temperature measured. The commonly used linear correction equation is
used:
Conductivity at
25
°
C
=
Conductivity at T
measured
1 + 0
.
02(
T
measured
–
25)
(1)
where
T
measured
is the sample temperature in °C.
6.1.3
High Color and Turbidity Warning
The SP-710 has extra channels to measure sample turbidity and color to automatically compensate sam-
ple color and turbidity interference. If sample turbidity and color values determined are too high, a PTSA
measurement warning will be displayed. In such a case, the user should filter the sample for PTSA mea-
surement.
6.2
TMB Free and Total Chlorine Measurement
The SP-710 offers Free and Total chlorine methods based on the USEPA-accepted tetramethylbenzidine
(TMB) chemistry. Pyxis also offers Free and Total chlorine reagent in a 30 mL, easy-to-use dropper bottle
which is sufficient for up to 230 individual tests. This unique liquid reagent contains the TMB reagent for
free or total chlorine, a pH buffer, and a polymeric binder. See the
section for ordering
details. When three drops of these liquid reagents are administered into the sample cell of the SP-710, the
TMB reagent rapidly reacts with free or total chlorine present to develop a stable, yellow-colored solution.
The SP-710 measures the absorbance value of the resulted yellow solution to determine the free or total
chlorine concentration.
SP-710 User Manual
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