Xylem MULTI 3400i pH/Oxi MULTI-PARAMETER METERS - Manual (Page 66)

What to do if... pH/ 3400i
66
Measured value too low
Measured value too
high
6.3 General errors
Display LoBat
Instrument does not
react
to keystroke
Display
to to to to
Probe symbol flashes
Message
StoFull StoFull StoFull StoFull
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
– Batteries almost empty – Exchange the batteries (see
section 5.1 M AINTENANCE )
Cause Remedy
– Operating condition undefined
or EMC load unallowed
– Processor reset:
Switch the instrument on
while pressing the <CAL> key
Cause Remedy
– Time-out of the interface – Check the instrument that is
connected
Cause Remedy
– Calibration interval expired – Recalibrate the measuring
system
Cause Remedy
– All memory locations are full – Output data storage and clear
data storage