Siemens SITRANS LG250 Operating Instructions Manual page 45

Unlock setup - adjust-
ment
PBD-51041388
Note:
Check the distance to the product surface, because if an incorrect
(too large) value is entered, the existing level will be saved as a false
signal. The level would then no longer be detectable in this area.
If a false signal suppression has already been created in the sensor,
the following menu window appears when selecting "False signal
suppression":
The instrument carries out an automatic false signal suppression
as soon as the probe is uncovered. The false signal suppression is
always updated.
The menu item "Delete" is used to completely delete an already cre-
ated false signal suppression. This is useful if the saved false signal
suppression no longer matches the metrological conditions in the
vessel.
With this menu item you safeguard the sensor parameters against
unauthorized or unintentional modifications.
To avoid possible errors during parameterization in a non-safe user
environment, a verification procedure is used that makes it possible
to detect parameterization errors reliably. For this, safety-relevant
parameters must be verified before they are stored in the device. In
normal operating condition, the instrument is also locked against
parameter changes through unauthorized access.
For this reason, the instrument is shipped in locked conditon. The PIN
in the delivery status is "0000".
Character string comparison and serial number
You first have to carry out the character string comparison. This is
used to check the character respresentation.
Confirm if the two character strings are identical. The verification texts
are provided in German and in the case of all other menu languages,
in English.
Afterwards you confirm that the serial number of your instrument was
carried over correctly. This is used to check device communication.
In the next step, the instrument checks the data of the measurement
and decides by means of the evaluation results if a functions test
SITRANS LG250 - Operating Instructions
45