SP-765SS Series Sensor Manual
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4.2.1
Free Chlorine/ Chlorine Dioxide Calibration
The oxidizer measurement module of ST-765SS Series is rigorously calibrated before leaving the factory. If
calibration is required, users can perform single-point or two-point calibration as required. The sensor will
measure its specific oxidizer based on model name. ST-7565S-FCL for Free Chlorine and ST-765SS-CLO for
Chlorine Dioxide. Each may be respectively calibrated for Zero and Slope Calibration using a known
standard / sample tested and measured by DPD wet chemistry methods.
4.2.1.1
Single Point Calibration Procedure
The ST-765SS Series must be slope calibrated in the FR-50 flow reservoir provided with the sensor and must
have
CONSISTENT
flow within the specified range of 200 to 400mL per minute. Determine the Free Chlorine
or Chlorine Dioxide concentration in ppm (mg/L) of the sample water taken from the FR-50 output sample
by using the DPD method on the handheld Pyxis SP-200 Oxi-Pocket (P/N 50802) or alternative compliant
colorimeter. Launch the uPyxis app and connect to the ST-765SS Series sensor. Tap
SLOPE CALIBRATION
.
Enter the free chlorine or chlorine dioxide concentration determined by the DPD method in the dialog
window as shown in Figure 6 based on the model sensor you are calibrating. Please make sure that the
sensor reading has been stable for at least 10 minutes before calibration. For best results, the concentration
of the Free Chlorine and Chlorine Dioxide sample flow standard should be in the range of 0.1 to 5.0 ppm.
4.2.1.2
Two-Point Calibration Procedure
Zero-point Calibration: Launch the uPyxis app and connect to the ST-765SS sensor. Remove the ST-765SS
sensor from the FR-50 flow reservoir and place the sensor into a beaker containing Pyxis Zero Chlorine
Calibration Standard Solution (P/N 21022), then tap
ZERO CALIBRATION
in the uPyxis app. Please allow
sufficient time (a few minutes) for the sensor to stabilize before performing the calibration.
*NOTE*
Users
may also use up to 100 us/cm conductivity standard as a ZERO CALIBRATION solution.
Slope-point Calibration: Insert the ST-765SS Series sensor back into the FR-50 flow reservoir and reestablish
sample flow. The ST-765SS Series must be slope calibrated in the FR-50 flow reservoir provided with the
sensor and must have
CONSISTENT
flow within the specified range of 200 to 400mL per minute. Determine
the Free Chlorine or Chlorine Dioxide concentration in ppm (mg/L) of the sample water taken from the FR-
50 output sample by using the DPD method on the handheld Pyxis SP-200 Oxi-Pocket (P/N 50802) or
alternative compliant colorimeter. Launch the uPyxis app and connect to the ST-765SS Series sensor. Tap
SLOPE CALIBRATION
. Enter the free chlorine or chlorine dioxide concentration determined by the DPD
method in the dialog window as shown in Figure 6 based on the model sensor you are calibrating. Please
make sure that the sensor reading has been stable for at least 10 minutes before calibration. For best
results, the concentration of the Free Chlorine and Chlorine Dioxide sample flow standard should be in the
range of 0.1 to 5.0 ppm
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