Metrohm 781 pH/Ion Meter - Manual (Page 126)

8.2 Messages
116
780/781 pH/Ion Meter, Manual
Message Situation Cause Remedy
XXX bytes
missing Method storing XXX bytes are missing for
saving a method Press to delete
old methods
V add too
large Conc calibration,
standard addition Standard volume to be
added is larger than buret
volume • Use larger buret
• Reduce start volume
• Increase standard con-
centration
V add too
small Conc calibration,
standard addition Standard volume to be
added is too small • Check parameters (see
Section 6.5.5 or 6.6.1)
• Reduce standard con-
centration
• Use smaller buret
check working
cond. Standard addi-
tion,
sample addition No change in potential
after standard addition Check standard addition
Strongly drifting electrode
signal Check electrode
Slope sign incorrect for
type of ion Check ion parameters under
Section 6.5.2
evaluation er-
ror Conc calibration,
standard addition,
sample addition Evaluation not possible • Check parameters
• Check standards
please wait Report output New task was started dur-
ing report output Wait for report output
delta T >2 °C pH calibration,
Conc calibration
Temperature difference
between two buffers or
standards is too large 1. Match temperatures
2. Continue with
or cancel
with and re-
start
Electrode test Temperature difference
between two buffers is too
large 1. Cancel electrode test with
2. Restart with suitable buff-
ers
check elec-
trode Temperature
measuring Short circuit or interruption Remedy fault or change
mode
electrode test
not passed Electrode test Electrode test gives values
outside the tolerances see Section 8.6.4
validate in-
strument Instrument has
been switched on Set validation interval has
expired 1. Validate instrument
2. Reset time counter to ze-
ro (see Section 5.5 )
same buffer pH calibration Potential difference be-
tween 1st and 2nd buffer is
too small 1. Change buffer
2. Press
same standard Conc calibration Pot. difference between 1st
and 2nd standard < 6 mV 1. Change standard
2. Press