Whenever you leave a Binder sensor cable, which is not connected to an RTU, in the field, you must protect the Binder connector from moisture ingress - or corrosion will be the inevitable consequence. Therefore we very much recommend to all service staff to always bring some of these caps to any field trip - just in case!
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To make sure water cannot get in and that IP67 protection is provided, hand tighten well. The cap comes with an internal O-ring that presses against the edge of the Binder jack - you will feel it as you tighten the cap.