Was this issued by the OEM as a direct replacement? As Proximities can come in NPN or PNP (sink or source).
If this is a direct replacement then in the absence of any other instructions, it would most likely be safe to assume that the original was Red+v, Black -v and White load or output.
The most common colours now are Brown +v, Blue-v and Black, output.
You should be able to confirm the original colour identity be how it is wired into the machine.
What is the make of the replacement?