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
To preform a probe cleaniness check, first select the
Diagnosis Condition
which defines the fluid type that
the ST-525SS probe in currently measuring, then click
Cleanliness Check
. If the probe is clean, a green
Clean
message will be shown. If the probe is partially fouled, a yellow
Becoming Dirty
message will
be shown. If the probe is severely fouled, a red
Dirty
message will be shown. In this case, follow the
procedure in the
Methods to Cleaning ST Series Probe
section of this manual.
Figure 16.
7
Communication using Modbus RTU
The ST-525SS probe is configured as a Modbus slave device. In addition to the ppb Fluorescein value, many
operational parameters, including warning and error messages, are available via a Modbus RTU connection.
Contact Pyxis Lab Customer Service (
) for more information.
8
Sensor Maintenance and Precaution
The ST-525SS probe is designed to provide reliable and continuous Fluorescein readings even when installed
in moderately contaminated industrial cooling waters. Although the optics are compensated for the effects
of moderate fouling, heavy fouling will prevent the light from reaching the sensor, resulting in low readings
and the potential for product overfeed if the ST-525SS probe is used as part of an automated control system.
When used to control product dosing, it is suggested that the automation system be configured to provide
backup to limit potential product overfeed, for example by limiting pump size or duration, or by alarming if
the pumping rate exceeds a desired maximum limit.
When installed with upstream/downstream compression fittings, the ST-525SS probe is designed to be
easily removed, inspected, and cleaned if required. It is suggested that the ST-525SS probe be checked
for fouling and cleaned/calibrated on a monthly basis. Heavily contaminated waters may require more
frequent cleanings. Cleaner water sources with less contamination may not require cleaning for several
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