Vaisala PR-23 Series User Manual

Figure 34 Eect of tolerance time on output
7.2.4 QF threshold
The QF threshold setting can be used to prevent the instrument from measuring when the
image quality is below a certain limiting value. When QF value lower than the defined value,
the image status changes to NO OPTICAL IMAGE after the defined tolerance time, see
Tolerance time (page 63).
By default the QF threshold value is -500.
7.2.5 Hold source interactions
There are three reasons why the measurement signal may be in hold. All three result in the
same behavior, but they also interact with each other.
Wash-related hold, see
Hold during wash (page 63), and external hold, see External hold
(page 63), are connected in parallel. If at least one of them is active, the measurement result
will be in hold.
Tolerance time, see Tolerance time (page 63)
, is independent of these two, but the tolerance
time is reset whenever there is another reason for the measurement hold. For example, if the
tolerance time is set to 10 s, and wash hold becomes active after 7 s, the remaining tolerance
time resets to 10 s After the wash is over, there is still 10 s of tolerance time remaining.
PR-23 Series User Guide
IM-EN-PR23-E
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Vaisala PR-23 Series Specifications

General

Brand	Vaisala
Model	PR-23 Series
Category	Measuring Instruments
Language	English