Is there a power-saving mode on a D6T?
No. The D6T thermal sensor does not have a power-saving mode.
Can the field of view (FOV) angle be increased?
No, OMRON set the FOV in consideration of the constraints imposed by the thickness and refractive index of the silicon lens. Measurement distance is reduced as the FOV of one element increases. Therefore, they can not simply widen the viewing angle. A good way to measure a wide range is to install multiple sensors or mount the sensor on a movable/rotating base.
Does the Silicon Lens have any effect on the infrared remote controller?
No. The silicon lens Omron uses on parts like D6T-8L-09H will not pass through most near-infrared and visible light below 1.2 [μm] wavelength. Therefore, it does not affect the infrared signal of the remote controller. The far infrared rays that are emitted as radiant heat are about 4 to 14[μm].
What is the distance range that can detect the presence of people?
The distance range is greatly affected by the decision performance and software installation conditions. It is also affected by the size of the object to be measured and the area of the FOV per element. A rough guideline distance is about 5 to 6 meters.
Here is some additional information for the D6T series:
User Manual: https://omronfs.omron.com/en_US/ecb/products/pdf/en_D6T_users_manual.pdf
Omron FAQ for Thermal Sensors: https://www.components.omron.com/faq/sensors#environment-sensors