wtw inoLab Level 3 Operating Manual page 245

Display
StirrerError
Measured value too
Measured value too
high
Cause
– Stirrer mechanically
blocked or defective
Cause
low
– Insufficient flow
Cause
– High amount of dissolved
substances
– Air bubbles bump on the
membrane with high
velocity
– The carbon dioxide
pressure is too high (> 1
bar)
What to do if...
Remedy
– Eliminate the blocking
or disconnect the
defective stirrer
– Disconnect, then
reconnect mains plug
Remedy
– Provide flow to the probe
Remedy
– Correct solubility
function using the
salinity equivalent
– Avoid direct flow to the
membrane
– Measuring not possible
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