I have a few question about sensor: I know it now I skill, but when you use it, does it have a time limit on it. Like if you use sensor on your active turn it goes to your next active turn or it ends at you active turn. When you use sensor, can all of your units benefit from the skill or just the model the uses the sensor skill.
no time limit. I assume you are asking about the enemies regaining camouflage, if that is correct it only prevents enemy troopers around the user. so each of your sensor troops would need to use it.
The model that Declares the Sensor as a Short Skill (so active turn only) discovers all camo during the resolution step of the Order in which it was used, providing they pass the WIP+6 roll. In addition it has two passive, ongoing effects that happen in either turn. 1) Enemies in ZoC of the model with Sensor cannot enter the Camouflaged state 2) Any Discover rolls made by the trooper with Sensor against a Camouflaged Marker get a +6 MOD.
In regards to 1, my understanding is that only takes effect after the user uses sensor. You are making it sound like it just always happens.
The short skill lets you make a wip+6 roll to reveal anyone in camo in ZoC. The passive skill prevents anyone in ZoC from entering camo state.
Also troops in Hidden Deployment. Pretty sure Saito Togan is lurking near an objective? Run up a Sensor bot and ping the zone, see what pops up.