The 4027 Model is a frequency to current converter developed by Spectec. It is specifically built with selectable high or low frequency input design to be used with active or passive magnetic speed sensors and Hall effect sensors for a wide range of applications. The unit is also equipped with 4 mA to 20 mA signal. It can be used with both 2-wire or 3-wire power supply and offers easy mounting directly to a conduit mount magnetic sensor. Fits an ELBY 90° enclosure.