Hach-Lange PROGNOSYS - Manual (Page 11)

Figure 6 Display overview for four sensors
1 Sensor 1 3 Sensor 3
2 Sensor 2 4 Sensor 4
Measurement value indicator
If the sensor condition changes, the measurement value indicator changes. A deterioration of the
measurement value indicator level in the top bar can change the color in the bottom service bar.
Pending maintenance tasks do not have an immediate effect on the measurement value indicator
(e.g., to replace the reagents).
A change in color from green to yellow shows that the reliability of the measurement value
decreased. There can be a deviation in the measurement value, but the value is still within the
permissible tolerance.
The top bar shows the measurement value indicator in [%].
If the vertical cursor is in the red area (<50%), the measurement value indicator is not in the
permitted range. These measurement values must not be used for control purposes in processes.
Refer to
Service and measurement value indicator messages on page 11 for troubleshooting.
When the errors are successfully solved, the color automatically changes from red to green.
Service indicator
The service indicator shows the maintenance status of the sensor. The bottom bar shows the
number of days that remain until a maintenance task must be completed. The date and time for the
next maintenance task (e.g., cleaning or calibration is calculated). Service tasks with no countdown
show immediately and change the color from green to red (e.g., an interruption of communication
over a prolonged period or moisture in the sensor).
The number of days until the next maintenance tasks is shown in the applicable message list. Refer
to
Configure the sensor on page 11.
See the message lists
The messages in the measurement value indicator list show the type of incident with a percentage
value. The percentage shows the influence degree on the probability that the measurement value is
correct. The measurement value indicator is the product of the first incident multiplied by the average
of all possible incidents. Notice that incidents with 100% are not shown in the list but are part of the
calculation.
Refer to
Service and measurement value indicator messages on page 11 for a general overview of
the instrument-specific messages.
English 9