Signet has combined the 9900 SmartPro® Transmitter with conductivity and resistivity sensors to create integral systems that are easy to order and simple to install. Also available in flow, level, temperature andpressure confi gurations, each integral system features a 9900 Transmitter which provides a local and easy to read LCD display. The push button keypad makes it easyto navigate through the transmitter’s menu. The DC powered 9900 features a scalable 4 to 20 mA output and  open collector for process control. The integral system is also off ered with a choice of Signet conductivity and resistivity sensors, Models 2839, 2840, 2841, and 2842 in 0.01, 0.1, 1.0, or 10.0 cm-1 cell constants, respectively. These sensors are field proven and reliably perform in ranges from 18.2 MΩ (0.055 μS) to 200,000 μS. They are ideal for installation into standard pipes via the ¾ inch sensor threaded (NPT or ISO) process connection. The sensors are available with 316 stainless steel and PVDF wetted materials.