Siemens SITRANS T Series Operating Instructions Manual page 62

Functions
9.21 Individual password protection (SITRANS TH300 only)
In the condition of goods delivered, every transmitter is set with the default password 2457.
Password protection is deactivated. If you reset the transmitter to the factory setting, the
current password will not be reset to the default password. Should you no longer know your
password, then the data in the device can only be altered using a "super pin", therefore not
using the default password. The super pin can be obtained from your regional Siemens
contact person.
Procedure for writing data in a password protected device
1. Select the "Deactivate password protection" menu in the parameterization software.
2. Enter your 4-digit password. Password protection is deactivated.
3. Change the values according to your application.
4. Select the "Activate password protection" menu in the parameterization software. The
device is write protected again.
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SITRANS TH200/TH300
Operating Instructions, 08/2015, A5E00393069-04