SP-765SS Series Sensor Manual
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Figure 6. A ST-765SS discovered by Bluetooth scan
Figure 7. Calibration page
4.1.1 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.
4.1.1.1 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 4,000mL 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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