Commissioning
75
Zero point
0.05 ... 2.00 pH
Factory setting
1.30 pH
If the zero point deviates from the target zero
point by the value entered here, an alarm (error
no. 033) can be triggered (for error activation,
see "Set up 1 - Alarm" section).
Example: The specified zero point of the
electrode is 7.00 pH (for electrode with pH 7
internal buffer). Enter 0.05 pH as the zero point
deviation. Then an alarm can be triggered if the
measured zero point is < 6.95 pH or > 7.05 pH.
SCC (Sensor Condition Check)
Options
• On
• Off
Factory setting
Off
This function monitors the electrode status or
the degree of electrode aging. Possible status
messages: "Electrode OK", "Low wear" or
"Replace electrode". The electrode status is
updated after each calibration. When the
"Replace electrode" message appears, an error
message may be displayed (E040, E041)..
!
Note!
This function is only available for glass
electrodes. If you combine a glass electrode and
an ISFET sensor, you can use the SCC function
without any restrictions. It only monitors the
glass electrode however.
Isothermic compensation
Activation and subsequent entry
• Function
– On
– Off
• Uis
0.00 ... 16.00 pH
Factory setting
Function: Off
Uis: 0.00 pH
Here you can activate the isotherm
compensation and enter the isotherm
intersection point (Uis).
Function off:
For E+H electrodes.
Function on:
Only if the isotherm intersection
point
≠
zero point of the electrode. The bigger
the difference between the isotherm
intersection point and the zero point, the
greater the measuring error in the event of
fluctuations in temperature.
Uis:
Enter the point at which the isotherms of
the electrode intersect.
!
Note!
When you activate the isothermic
compensation the electrode has to be calibrated
before measuring.
Stability criteria
Activation and subsequent entry
• Threshold
01 ... 10 mV
• Length
03 ... 70 s
Factory setting
Threshold: 02 mV
Length: 20 s
During calibration, the mV value may change
during the given period ("duration") at
maximum by the stated amount ("threshold"),
so that the calibration is considered as stable.
You can thus individually adapt the accuracy
and time involved to your process.
Calibration timer
Calibration timer
Activation and subsequent entry
• Cal-Timer
– On
– Off
• Warning
0001 ... 9999 h
Factory setting
Cal-Timer: Off
Warning: 0001 h
If no calibration is undertaken in the set time,
an error message appears (E115).
Cal-Timer on:
Activate the timer
Warning:
Enter the time within which the
next calibration has to take place.
Time:
Displays the time remaining until the
error message (countdown).
Function
Options
Info
Содержание Topcal S CPC310
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