
Transmitter M400/2(X)H, M400G/2XH 89
© 03 / 2014 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400/2(X)H, M400G/2XH
Printed in Switzerland 30 031 683
14.3.2 Dual membrane pH electrodes (pH / pNa)
Warnings Description
Warning pH slope >102% Slope too big
Warning pH Slope < 90% Slope too small
Warning pH Zero > 8.0 pH Zero offset too big
Warning pH Zero < 6.0 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 pNaGls change< 0. 3* Glass electrode resistance changed by more than factor 0.3
Warning pNaGls 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 > 9.0 pH Zero offset too big
Error pH Zero < 5.0 pH Zero offset too small
Error pNa Gls Res > 2000 MΩ* Glass electrode resistance too big (break)
Error pNa Gls Res < 5 MΩ* Glass 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)
* According to the parameterization of the transmitter (see chapter 8.5.1 “Alarm”;
PATH: Menu/Configure/Alarm/Clean/Setup Alarm)
14.3.3 ORP messages
Warnings* Description
Warning ORP ZeroPt > 30 mV Zero offset too big
Warning ORP ZeroPt < – 30 mV Zero offset too small
Alarms* Description
Watchdog time-out SW/System fault
Error ORP ZeroPt > 60 mV Zero offset too big
Error ORP ZeroPt < – 60 mV Zero offset too small
* ISM sensors only
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