Operation
Liquisys M CPM223/253
46
Hauser
Check
The CHECK function group is only available for devices with a Plus Package.
In the CHECK function group, you can select two different monitoring functions for the
measurement:
SCS electrode monitoring
The Sensor Check System monitors the pH and reference electrode for incorrect measurement and
complete failure.
SCS identifies the following reasons for incorrect measurement:
• Electrode glass breakage
• Fine short circuits in the pH measuring circuit, also e.g. moisture or dirt bridges at terminal points
• Contamination or clogging of the reference electrode
• Leak current for ISFET sensor
The following three monitoring methods are used:
• Monitoring the pH electrode for high resistance (alarm if a minimum impedance is undershot,
approx. 500 k
Ω
).
This function cannot be selected for antimony and ISFET electrodes (A4).
• Monitoring of impedance of the reference electrode (alarm if set threshold value overshot).
This function can only be selected for symmetrically high-resistance measurement.
• Monitoring of leak current for ISFET sensors (pre-alert E168 at I
LEAK
> 200 nA, error E008 at
I
LEAK
> 400 nA).
F7
Set error current to be
effective for the
selected error
no
yes
The option selected in F4 is effective or
ineffective in the event of an error.
This setting
only
applies to the error selected
in F5.
F8
Automatic cleaning
function start
no
yes
This field is not available for certain errors, see
"Trouble-shooting and fault elimination"
section.
F9
Select return to menu
or next error
next
= next error
←
R
If
←
R is selected, you return to F, if next is
selected, you go to F5.
Coding
Field
Setting range
(Factory settings, bold)
Display
Info
F7
Curr.Assg
no
F8
CleanTrig
no
F9
Select
next
