Siemens SITRANS TH100 Operating Instructions Manual page 172

Parameter assignment
9.5 Locking the device
Procedure
1. Switch off the power supply.
2. Open the housing.
Press the recesses marked in the figure with a pen.
Figure 9-4
3. Set the jumper as follows:
Figure 9-5
Meaning of the jumper positions (Page 45)
Result
When the jumper is set, only the measured values and the parameters can be read.
172
Enclosure top view: Above and below
SITRANS TH: Enable write protection using the jumper
SITRANS TH100/TH320/TH420/TR320/TR420/TF320/TF420 with 4 to 20 mA/HART
Operating Instructions, 05/2020, A5E41864807-AB