The Series 185 Smart Positioner takes a 4 to 20 mA input signal to accurately control the valve stroke of linear valves. The Series 285 Smart Positioner also takes a 4 to 20 mA input signal to accurately control the valve stroke of rotary valves. Observations of the positioners condition are made easy with a standard LCD display. To help reduce operating costs, air consumption levels are near zero, without reducing the performance of the Smart Positioners. To ensure reliability, both the Series 185 and 285’s construction consists of a durable aluminum or stainless steel. For added convenience, the auto calibration function ensures high accuracy of the unit. With HART® communication protocol as standard, both the Series 185 & 285 Smart Positioners factory settings can be configured as needed.