Figure 36.
Figure 37.
7.4.4
Slope Calibration using User-Defined TMB Chlorine Standard
The TMB Chlorine method has been calibrated prior to shipping; there is no need to calibrate unless a cali-
bration check (see the
Calibration Check using Pyxis TMB Chlorine Secondary Standard
section) indicates
that the method needs to be re-calibrated. The following steps are used to carry out a slope calibration
using a solution of known free or total chlorine concentration:
1. Power on the SP-710 by pressing
. Allow 5–10 seconds for the SP-710 to stabilize.
2. Press
Measure
(
) as needed to highlight
Chlorine
in the selection menu.
3. Press
to launch the
CHLORINE MEASUREMENT
screen (Figure 38).
4. Rinse the main module sample cell three times with the known chlorine solution. Fill the sample cell
with the solution.
5. Press
Zero
(
).
ZERO
will appear on the top-left corner of the display (Figure 39).
6. Prepare the developed blank-zero sample:
(a) Add 3 drops of Free or Total Chlorine reagent into the sample cell.
(b) Draw out the solution and reagent from the sample cell using the disposable pipette to provide
mixing.
(c) Once the sample has been drawn into the reagent pipette, shake the pipette or squeeze the
sample back into the sample cell allowing the reagent to fully dissolve.
7. Press
Timer
(
). A 2-minute timer will begin.
8. The SP-710 will continuously display the free or total chlorine concentration as the timer counts down
(Figure 40). If the real-time readings remain steady, press
Stop
(
) to stop measurement timer
early or wait for the 2-minute timer to end.
9. Press
Cal
(
) to launch the
CHLORINE CALIBRATION
screen (Figure 41).
10. Press
Slope
(
).
11. Use
+
(
) and
-
(
) to adjust the chlorine concentration to the value of the known chlorine
solution (Figure 42).
SP-710 User Manual
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