5
Functional description
Page 60
gas-lab
Q1
A
Hint
is generated if a measurement violates a hint limit specified by the
operator (upper/lower hint limits for gas quality data).
In addition, a hysteresis can be defined to avoid fluttering messages when a
measurement fluctuates around a limit value. The message
<Hint limit
begins>
will then be generated or removed only if the measurement is not
within the hysteresis range.
A hint will also be generated if an event occurs which has no influence on
the gas quality measurement (e.g.
Calibration switch open
).
The beginning of a hint is entered in the error listing together with a time
mark. Hints cannot be accepted and disappear from the error listing
automatically after they have ended.
A complete list of all errors together with their classification is included in the
annex to this documentation.
The status LED of the device indicates the message with the highest priority
level (pending alarm, pending warning, unaccepted alarm, unaccepted warning)
according to the table in Chapter 3.2.
5.3.1.2
Measurement indication
In addition to monitoring measurements for hint limits and gradients, the device
may also file up to 32 measurements. For each defined measurement the
minimum and maximum values measured since the last reset are indicated. The
operator can view these values together with the associated time marks on the
display.