The PURE – Plasma Duct Mounted Ion Sensor is designed to sense the presence of ions in a duct. Dry contacts are provided to interface with the Building Automation System (BAS). The contact will open below a user-defined value and will close above that value. The sensor also includes LEDs for power and ion indication.The unit is installed on the side of the duct utilizing the pre-drilled mounting brackets located at either side of the unit with the probe extending into the airstream. The unit contains a control knob that can be field adjusted to increase or decrease the sensitivity at which the ions are sensed.