wtw Ox i340i, Руководство по эксплуатации

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What to do if... Oxi 330i/340i
48 ba52306e04 03/2008
Error message
E7
AR flashes
continuously
Measured value
too low
Measured value
too high
Display
to
Probe symbol
flashes
Cause Remedy
Membrane damaged
– Membrane damaged – Regenerate probe
– Membrane head not screwed
on tight enough
– Screw membrane head tight
Cause Remedy
No stable measured value
– Membrane contaminated – Clean membrane
Cause Remedy
– Insufficient
flow
– Provide flow to the probe
Cause Remedy
– High amount of dissolved
substances
– Correct solubility function using the
salinity equivalent
– Air bubbles bump on the
membrane with high velocity
– Avoid direct flow to the membrane
– The carbon dioxide pressure is
too high (> 1 bar)
– Measuring not possible
Cause Remedy
– Time-out of the interface – Check the instrument that is
connected
Cause Remedy
– Calibration interval expired – Recalibrate the measuring system