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6.5 Diagnosis Screen
After the device has been calibrated and installation has been completed, to check diagnosis, click on Diag-
nosis . When in the Diagnosis screen you can view the Diagnosis Condition of the device. This feature may
be used for technical support when communicating with service@pyxis-lab.com . To preform a Cleanliness
and Selflife Check, first select the Diagnosis Condition which defines the fluid type that the ST-772/T sensor
is currently measuring, then click Cleanliness and Selflife Check . If the sensor is clean, a Clean message
will be shown. If the sensor is fouled, a Please replace the DO membrane cap message will be shown. In
this case, follow the procedure in the Methods to Cleaning the ST-772/T section of this manual.
Figure 15.
7 Outputs
7.1 4–20mA Output Setup
The 4–20mA output of the ST-772 sensor is scaled as:
• Dissolved Oxygen:
– 4 mA = 0 ppm
– 20 mA = 20 ppm
7.2 Communication using Modbus RTU
The ST-772/T sensor is configured as a Modbus slave device. In addition to the ppm dissolved oxygen value,
many operational parameters, including warning and error messages, are available via a Modbus RTU con-
nection. Contact Pyxis Lab Customer Service (
service@pyxis-lab.com ) for more information.
ST-772/T User Manual service@pyxis-lab.com | +1 (866) 203-8397 17