PT Series timers are analog timers that work without a display. Time can be set with two presets provided and no. of channels can be set by placing the jumper on the required position.This timer series is very user friendly but lacks precision of time setting as in Digi or Digi New series.This timer easy enough to use for even untrained staff. Another important feature of this timer is cascading. Any no. of timer can be joined together to be used in large dust collectors. This timer is supplied in a sturdy sheet metal enclosure with cable glands to provide complete dust protection.