The 900 Series Multi-Parameter Monitor/Controller includes everything required to simplify water quality management of municipal unit processes in one flexible, powerful instrument. Simultaneously monitor and control critical water quality parameters through multiple inputs/outputs with the legendary accuracy and reliability the Myron L Company has come to be known for. The 900 Series is user-intuitive with an LCD touchscreen GUI along with pluggable terminal blocks for quick and easy equipment installation and configuration. 7 inputs make it possible to monitor all the most common water quality parameters simultaneously: 2 Conductivity, Resistivity, TDS, or Salinity; 1 pre-amplified pH or ORP; 1 BNC pH or ORP; 1 0-20/4-20 mA; 1 RTD Temperature; and 1 Flow/Pulse. % Rejection is available as a derived value. Advanced Conductivity and TDS functions feature three preprogrammed solution modes, KCl, NaCl, and Myron L’s own 442 Natural Water™ Standard. Or program a User solution mode when the constituents and behavior of the solution are known. The ability to match the solution mode to the actual characteristics of the water being monitored instead of using one set solution model, yields far greater precision conserving chemicals and ensuring regulatory compliance. Temperature compensation is automatic to 25°C but can be disabled by the user if required. The pH/ORP input channel is designed for use with Myron L pre-amplified pH and ORP sensors. These sensors contain precision circuitry that increases accuracy and permits application of the sensors over greater distances. A 0-20/4-20 mA input accepts user-defined 0- to full-scale values and units of measure for an array of sensor types. The 900 Series is also low maintenance and user serviceable with both electronic and wet calibration functions. Outputs include up to 3 relays; 2 remote alarms; 1 0-20/4-20 mA; 1 0-5/0-10 VDC; and 1 RS-485 ASCII Serial Output. Relays output to any user-supplied control equipment requiring up to 250V each and can trigger on any input parameter. The 0-20/4-20 mA output can transmit a signal for any input parameter. 0-5/0-10 VDC can be scaled to optimize resolution and can output to a recorder, PLC, SCADA system, etc. 0-1 VDC is possible with an optional resistor. Hysteresis values can be specified by the user or automatically set by the 900 Series to prevent chatter. The user-adjustable cell constant (Conductivity, Resistivity, TDS, and Salinity) and sensor cable length (Conductivity, Resistivity, TDS, Salinity, pH and RTD) assure precise measurements from sensor to sensor. Administrator and Operator password protection levels prevent unwanted tampering. A brightly colored red, yellow, and/or blue LCD background instantly alerts the user to the solution status. And a ¼ DIN Size Chassis makes it easy to mount.