Metrohm 746 VA Trace Analyzer - Manual (Page 526)

7.3 Error messages
746 VA Trace Analyzer / 747 VA Stand
7-27
Error message Meaning/Causes Rectification Exit
SUBSTANCES - ERROR 3:
Param. Mass conc.
missing Missing value for the Mass
conc. parameter
Enter Mass conc. parameter on the
”SUBSTANCES” page
Esc
SUBSTANCES - ERROR 4:
Param. Scope f./r.half
only with linear The f.half/r.half pa-
rameter is admissible only with
a linear baseline
Change Scope or Type parameter on
the ”SUBSTANCES” page
Esc
SUBSTANCES - ERROR 5:
Param. Scope
f./r.double missing
counterpart Missing counterpart for the
evaluation with f.double or
r.double ; in double peak
evaluation the first peak must
be evaluated with f.double
and the second peak with
r.double
Check Scope parameter for both
substances and change
Esc
SUBSTANCES - ERROR 6:
Param. Scope
f./r.double direction
conflict Wrong assignment of the two
peaks in the double peak
evaluation; the first peak (in
sweep direction) must be
evaluated with f.double , the
second with r.double
Check Scope parameter for both
substances and change
Esc
SUBSTANCES - ERROR 7:
Undefined error Non-specified error on the
”SUBSTANCES” page
Check the ”SUBSTANCES” page Esc
VA STAND - ERROR 1:
Missing device Connection to 747 VA Stand
broken:
− Connecting cable not
plugged in
− Wrong address
− Hardware fault at VA Stand
Check connection to 747 VA Stand:
− Plug in connecting cable
− Correct address and restart 746 VA
Trace Analyzer
− Run diagnostic routine for VA Stand
E/S
VA STAND - ERROR 2:
Working electrode
faulty Fault at MME working electr.:
− No connection
− Too less mercury
− Bad mercury quality
− Dirty or clogged capillary
− Dirty or damaged sealing
needle
− No inert gas pressure
− Dirty electrode body
− Fault at reference electrode
− No solution in measuring
vessel
− No electrolyte in measuring
vessel
− Tapping strength in DME
operation too weak
Fault at RDE working electrode:
− No connection
− Electrode tip not firmly
screwed on to the drive shaft
− Contaminated electrode
surface
Check MME:
− Connect reference electrode with WE
cable
− Fill MME with mercury (see section
3.4.2 and 3.4.7)
− Clean MME (see section 3.4.9) and
use ultrapure mercury (w ≥ 0.99999)
or filtered mercury
− Change capillary (see section 3.4.8)
− Clean MME (see section 3.4.9) and
replace sealing needle if need be
− Check inert gas connection (see
section 3.3.3)
− Rub the MME body dry, clean with
distilled water of dilute acid and dry
with a lint-free cloth
− see VA STAND - ERROR 4
− Add measuring solution
− Add a few drops of KCl 3 mol/L to the
measuring solution
− Turn slotted screw 71 71 on the 747 VA
Stand during operation in an anti-
clockwise direction until a drop falls
each time the tapper is triggered
Check RDE:
− Connect reference electrode with WE
cable
− Install RDE properly (see section 3.5)
− Regenerate RDE (see section 3.5.2)
r/a