Siemens Sitrans LR400 Instruction Manual page 60

4.6.8.7 Reference Difference (F = approx. 106 m [*calibration value])
Internal reference distance
The length of the reference distance in the units selected according to Parameter 4. 1 .5 is
view-only. The device uses this value to calibrate itself so that no manual adjustment is
necessary over long-term operation.
5. Options
5.1 Enter Code
Input of customer code to enable programmability
Value
The device compares a code number which you enter here with the code defined in
Parameter 5.2. If your entry matches the customer code completely, it releases the
programming lock for all parameters for 10 minutes. Any other code number locks and
disables programming.
5.2 Customer Code (F = 0)
Determination of customer code
Value
Here you define the customer code (up to nine digits), with which you can protect the
device parameters against programming errors. It is strongly recommended that a
customer code be entered after all programming is completed to secure the programmed
values from changes.
Use of the customer code is explained in
23.
5.3 Factory Reset (F = no)
Reset all parameters to factory setting
Value
This parameter allows you to reset all parameters to the original factory setting as
described in Parameters (HART) beginning on page 26.
Page 56 SITRANS LR400 (7ML5421) – INSTRUCTION MANUAL
Customer code
Up to 9-digit code
Disabling and Enabling Programming
Yes
No
on page
7ML19985FH06