JUMO 902940 DELOS T Electronic Temperature Switch with Display and Analog Output Operating Manual - Manual (Page 33)

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5 Operation
5.1 Operating element
How to proceed:
(1) Locking screw (2) Operating element
Step Activity
1 Remove the locking screw (1) using a suitable screwdriver.
2 Use the supplied combination tool
(or a 0.5 x 3 mm screwdriver or Allen key, width across flats 2)
to "Turn/press" the operating element (2).