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Operation
Coding
Field
Set error current to
F7
be effective for the
selected error
Automatic cleaning
F8
function start
Select return to
F9
menu or next error
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 kΩ).
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
I
LEAK
40
Setting range
(Factory settings, bold)
no
yes
no
yes
next = next error
←R
> 400 nA).
Display
no
F7
Curr.Assg
no
F8
CleanTrig
next
F9
Select
OPM223/253
Info
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.
This field is not available for certain
errors, see "Trouble-shooting and fault
elimination" section.
If ←R is selected, you return to F, if next
is selected, you go to F5.
> 200 nA, error E008 at
LEAK
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