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