Pyxis 53607, Руководство пользователя, Страница: 25 / 27

SP-765SS Series Sensor Manual service@pyxis-lab.com | +1 (866) 203-8397 23
Figure 2 3 Diagnostic Interface
4.3 Calibration on the Controller
It is recommended that the ST-765SS Series calibration be carried out using the uPyxis app as demonstrated
in the sections above. Alternatively, a single point calibration can be carried on the controller by adjusting
the mA-to-ppm ratio (free chlorine or chlorine dioxide). However, if calibration is to be performed via the
controller, it must be cleaned with deionized water prior to calibration, taking care to avoid direct hand
contact with the electrodes. Please follow the controller manufacturer's procedures for 4-20mA calibration
as with any sensor. With the default sensor settings, the controller should be set to convert 4 mA to 0 ppm
and 20 mA to 5.00 ppm for both ST-765SS-FCL and ST-765SS-CLO.
For single calibrations involving the sample water itself, use the Pyxis SP-200 (Portable Water Multimeter)
to determine the DPD free chlorine or chlorine dioxide concentration of the active sample water obtained
from the FR-50 flow reservoir outlet sample line.
5. Modbus RTU
The ST-765SS Series sensors are configured as a Modbus slave device. In addition to the ppm free chlorine
or chlorine dioxide values, many operational parameters, including warning and error messages, are
available via a Modbus RTU connection.
Contact Pyxis Lab Customer Service ( service@pyxis-lab.com ) for more information.