Problem with sensor no reason out signal when power on

[alg7777]

I have photoelectric sensor (6-36 V), PNP, NO+NC and when I power it for first time, it generate output signal with no reason (there is no object to detected)

What is the reason for this and how to deal with this problem?

 

[plugsandsparks]

If you post the manufacturer and model / part no of the sensor it may help, there are many types,

 

[alg7777]

If you post the manufacturer and model / part no of the sensor it may help, there are many types,

This is it: VEMARK, V3F-DS30P3/M