wtw Oxi 315i Operating Manual page 26

What to do if...
Measured value too low
Measured value too
Instrument does not
react to keystroke
26
Cause
– Insufficient
flow
Cause
high
– High amount of dissolved
substances
– Air bubbles bump on the
membrane with high velocity
– The carbon dioxide pressure
is too high (> 1 bar)
Cause
– Operating condition
undefined or EMC load
unallowed
Remedy
– Provide flow to the probe
Remedy
– Correct solubility function using
the salinity equivalent
– Avoid direct flow to the
membrane
– Measuring not possible
Remedy
<CAL>
– Press the
<ON/OFF> keys at the same
time and release them again.
The software version is
displayed briefly.
Oxi 315i
and