User Manual

<4. COMMISSIONING OF pH/ORP>
4-12
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
Table4.2 Errorconguration
Display item Description Default
pH too high ThepHvalueexceeds16.00. Warn.
pH too low The pH value is lower than –2.00. Warn.
Temperature too high Measured process temperature is higher than the
maximumlimit.
Warn.
Temperature too low Measured process temperature is lower than the
minimum limit.
Warn.
ORP too high TheORPvalueishigherthan1500mV. Off
ORP too low TheORPvalueislowerthan–1500mV. Off
rH too high The rH value is higher than 100. Off
rH too low The rH value is lower than 0. Off
Matrixcong.error Thetemperaturecompensationmatrixisnotset
properly (see Section 4.2.3).
Fault
Calib.timeexceeded Calibrationtimeexceedsthecalibrationinterval
(see Section 4.2.4).
Off
Wash half-time error The response to wash is abnormal. Off
Impedance 1 too high The sensor must be checked. Off
Impedance 1 too low
Impedance 2 too high
Impedance 2 too low
CAUTION
Ifcancelinganerrorcongurationcouldberisky,donotcancelitasadangeroussituationmay
result.
NOTE
The “Impedance 1 too high/too low” and “Impedance 2 too high/too low” error items are displayed
intheErrorcongurationscreen.Ingeneral,forapHsensor,“Impedance1”means“glass
electrode,” and for an ORP sensor, it means “metal electrode.” “Impedance 2” represents the
reference electrode in all cases. The “Impedance 1 too high/too low” and “Impedance 2 too high/
toolow”errorsareappliedtosensorswithaliquidearth.Sensorswithaliquidearthinclude
PH8EFP,PH8ERP,PH8EHP,OR8ERG,OR8EFG,etc.Forsensorsnotequippedwithaliquid
earth,theseerrorsshouldallbesettoOff;thesesensorsincludeHA405,HA406,DPA406,
DPA405,DPAS405,HF405,HA485,DPA485,etc.Moreover,formeasuringasolutionwithlow
conductivity such as when using a pH meter for pure water, set the “Impedance 2 too high” error
to Off. Otherwise, no impedance can be detected.
NOTE
WhenORPisspeciedasasensortypein“Sensorsetup”,andwhenanORPsensor,suchas
OR8ERGandOR8EFG,doesn’thaveanytemperatureelement,setbothof“Temperaturetoo
high/low”in“Error”toOffsothatnorelatederroriscaused.Duetotheopeninputoftemperature
signal, a false error may happen as if temperature goes over a high limit or a low limit.