Metrohm 781 pH/Ion Meter User Manual
Page 129
8 Troubleshooting – Messages – Maintenance
780/781 pH/Ion Meter, Manual
119
Message
Situation
Cause
Remedy
RS error 45
Report output
RS transmitter error:
The receiver buffer of the
pH Meter contains an in-
complete character string
(line feed missing); this has
blocked pH Meter trans-
mission
•
Press <QUIT>
•
Send line feed
stirrer not
found
Various situations An attempt has been made
to control an 8xx series
stirrer which is not con-
nected
1. Press
<QUIT>
2. Switch off instrument
3. Check stirrer connection
or
•
Check measuring pa-
rameters
•
If necessary, change stir-
rer connection configura-
tion to a 7xx series stirrer
(see Section 5.6)
service is due Instrument has
been switched on
Set service date has been
reached
Contact service (see
Sec-
change std
<ENTER>
Conc calibration
Instrument is waiting for a
new standard
1. Change standard
2. Press
<ENTER>
stop V reached Standard addi-
tion,
sample addition
Set stop volume has been
reached
1. Press
<QUIT>
2. Check method parame-
ters
system error
#X
System test after
switch on
pH/Ion Meter fault
1. Note error number
2. Contact Metrohm Service
----.- °C
or
check T-sensor
Various runs with
temperature
measurement
Temperature sensor is
faulty or has been un-
plugged during the run
Connect a properly function-
ing temperature sensor
Mode T
Temperature sensor is
faulty or not connected
Connect a properly function-
ing temperature sensor
transmission
error
PC keyboard
connecte
Communication problem
with PC keyboard
Check keyboard connection
with instrument switched off