Endress+Hauser OTR31 Operating Instructions Manual page 19

Temperature switch OTR31, OTR35
 8 Operating menu: A function groups, B functions, C settings
The function group 4-20 is available only if the 4 to 20 mAanalog output (4-20) is
selected under FUNC or FNC2 in function group OUT or OUT2.
Operating options
A0008103
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