YSI IFL 700 IQ - Manual (Page 32)

What to do if... IFL 70x IQ
6 - 2 ba76129e01 10/2012
The measured value is
not within the expected
range
Cause Remedy
The Water depth is not set correctly
(e.g., the bottom echo or multiple
echoes between the bottom of the
basin and the surface of the water
are interpreted as measured value
echoes.)
Set the Water depth and
Immersion depth correctly
In the Evaluation range there are
permanently installed fixtures that
continually generate interfering
echoes – Select a measurement loca-
tion without permanent inter-
fering echoes.
– If necessary, limit the Evalu-
ation range so that any per-
manent interfering echoes
are outside the Evaluation
range.
In the Evaluation range there are
moving fixtures (scrapers) that tem-
porarily generate echoes. – Limit the Evaluation range
so that the water depth of
the scraper is not in the
Evaluation range.
– Set the Establishing time
correctly
– Set Follow echo to Yes.
The sensor is cyclically moved out
of the water by the scraper. – Set the Establishing time
correctly
– Set Follow echo to Yes.