
Transmitter M300 90
© 12 / 11 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter Multiparameter M300
Printed in Switzerland 52 121 389
14.2 pHErrorMessages/Warning-andAlarmList
14.2.1 pHsensorsexecptdualmembranepHelectrodes
Warnings Description
Warning pH slope > 102% Slope too big
Warning pH Slope < 90% Slope too small
Warning pH Zero >7.5 pH Zero offset too big
Warning pH Zero < 6.5 pH Zero offset too small
Warning pHGls change < 0.3 Glass electrode resistance changed by more than factor 0.3
Warning pHGls change > 3 Glass electrode resistance changed by more than factor 3
Warning pHRef change < 0.3
Reference electrode resistance changed by more than factor
0.3
Warning pHRef change > 3 Reference electrode resistance changed by more than factor 3
Alarms Description
Watchdog time-out* SW/System fault
Error pH Slope >103% Slope too big
Error pH Slope < 80% Slope too small
Error pH Zero > 8.0 pH Zero offset too big
Error pH Zero < 6.0 pH Zero offset too small
Error pH Ref Res >150 KΩ** Reference electrode resistance too big (break)
Error pH Ref Res < 2000 Ω** Reference electrode resistance too small (short)
Error pH Gls Res > 2000 MΩ** Glass electrode resistance too big (break)
Error pH Gls Res < 5 MΩ** Glass electrode resistance too small (short)
* ISM sensors only
** According to the parameterization of the transmitter (see chapter 8.5.1 “Alarm”;
PATH: Menu/Configure/Alarm/Clean/Setup Alarm)
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