Calibrating Errors - wtw EcoLine LF 170 Bedienungsanleitung

Calibrating errors

Calibrating errors
Deviation of the cell constants: Deviation of the cell constants:
• • If the cell constant deviates by more than ± 10 % in the TetraCon If the cell constant deviates by more than ± 10 % in the TetraCon
300 sensors or by more than ± 50 % in the set cell constant 10 cm 300 sensors or by more than ± 50 % in the set cell constant 10 cm
message is output and four dashes appear on the display instead of the measured message is output and four dashes appear on the display instead of the measured
values. values.
• •
In the variable setting of the cell constant, this can only be changed within the In the variable setting of the cell constant, this can only be changed within the
range 0.09 cm range 0.09 cm
The last measured value is frozen (important for relay and recorder). The last measured value is frozen (important for relay and recorder).
Error message in the LF-Check mode. The sensor icon flashes. Error message in the LF-Check mode. The sensor icon flashes.
− To switch to the measuring mode, press the ENTER key: − To switch to the measuring mode, press the ENTER key:
If these measures are unsuccessful or cannot be performed and further measurement If these measures are unsuccessful or cannot be performed and further measurement
is still required, it is possible to proceed as follows: is still required, it is possible to proceed as follows:
− Use the C key to return to the "LF-Check" operating mode. − Use the C key to return to the "LF-Check" operating mode.
− Use the UP/DOWN keys to set the cell constant back to the allowable range of − Use the UP/DOWN keys to set the cell constant back to the allowable range of
± 10 % or ± 50 % of the default value. ± 10 % or ± 50 % of the default value.
128 128
-1 -1 -1 -1
.. 1.5 cm .. 1.5 cm . .
This message appears if the cell constant is This message appears if the cell constant is
exceeded or undercut by more than ± 10 % or exceeded or undercut by more than ± 10 % or
± 50 %. ± 50 %.
Measuring is only possible after a valid LF- Measuring is only possible after a valid LF-
Check! Check!
To recover from the error message: To recover from the error message:
− Check the measuring cell and clean or − Check the measuring cell and clean or
− Check the standard calibration solution and − Check the standard calibration solution and
Perform the LF-Check again. Perform the LF-Check again.
Calibration Calibration
replace it if necessary. replace it if necessary.
replace it if necessary. replace it if necessary.
 
700, 600 and 700, 600 and
-1 -1
, an error , an error