Re: M2850 sensor positioning for internal and external detection
Am I assuming correctly that you want to be inline and able to block? Also, are you using a fail-open kit? Unfortunately I cannot answer the rest of your questions without knowing what you want to accomplish.
The attached product guide explains how to cable the sensor for various situations.
Configuring the interfaces to know which is internal/external varies depending on the version of NSM you are using.
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