Model 54e pH/ORP Analyzer/Controller

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COMPREHENSIVE PH GLASS DIAGNOSTICS1 warn user of the need for calibration, maintenance or sensor replacement. HEAVY DUTY NEMA 4X (IP65) enclosure of epoxy-painted aluminum. AUTOMATIC CALIBRATION with buffer recognition and stabilization check. OPTIONAL TPC AND PID CONTROL CAPABILITY BACK-LIT DISPLAY with fully descriptive diagnostic messages and easy-to-use interface spells out each operation in English, French, German, Italian, or Spanish. TWO INDEPENDENT OUTPUTS for pH/ORP and temperature. THREE ALARMS WITH PROGRAMMABLE LOGIC, plus one dedicated fault alarm. SELECTIVE ION CAPABILITY.

FEATURES AND APPLICATIONS The Model 54e pH/ORP Microprocessor Analyzer, with the appropriate sensor, is designed to monitor and control pH or ORP in industrial and municipal processes using the most advanced technology available. The analyzer is housed in a rugged NEMA 4X (IP65) weatherproof, corrosion resistant enclosure of epoxy-painted aluminum. It is suitable for panel, pipe or wall mounting. All functions are accessible through the front panel membrane keyboard that features tactile feedback. The large back-lit dot-matrix liquid crystal display continuously indicates the measured variable in large numerals, along with the temperature, output value and two programmable process parameters (such as alarms or diagnostics variables). Three levels of security are available: 1) calibration, 2) output range and alarm setpoint adjustment, and 3) advanced configuration. A hinged front panel provides convenient wiring access. The Model 54e pH/ORP is also a member of the Rosemount SMART FAMILY® of instruments which is designed to communicate with the Model 275 HART® hand-held communicator and any other host that supports the 275 HART communication protocol. The two independent, galvanically isolated outputs provide 4-20 or 0-20 mA signals for the measured variable and temperature. Both output ranges are programmable within the measurement ranges of pH or ORP and temperature. The controller option also allows PID control choices acting on process measurement or temperature. Manual control of the output may also be selected for routine maintenance and tests. During hold mode the outputs will be at a preset or last process value. The state-of-the-art, continuous diagnostic capability of the analyzer eliminates troubleshooting guesswork by alerting the user to the following problems: • Cracked or broken pH electrode • Aged glass - calibration recommended • Worn out or non- immersed electrode • Poisoned reference (off-line only) • Faulty temperature element • Open wiring • pH electrode slope error (off-line) • Analyzer electronics failure. In the event of one of these conditions, the analyzer will display a descriptive message of the problem, illuminate a red LED on the front panel, and drive the outputs to preselectable fault mode values. A dedicated fault relay may be used to provide a visible or audible alarm to an operator. All operations and descriptive messages can be field selected for English, French, German, Italian, or Spanish. The glass impedance is continuously monitored and can be programmed to read out on the main display. Fault setpoints for the glass impedance are programmable. The glass impedance is temperature compensated for the greatest accuracy. The automatic buffer recognition feature uses stored buffer values and their temperature curves for the most common buffer standards available worldwide. The analyzer will recognize any two of the three selected buffer values for the two point calibration, and perform a self-stabilization check on the sensor in each buffer. Three process alarms are a standard feature. All alarms have programmable high or low activation, independent setpoints, adjustable hysteresis (deadband), and time delay. One relay may be configured as a timer relay for chemical cleaning, which may be activated at a specific time interval. An overfeed timer feature is also selectable for any one process relay. The control option allows each alarm the additional choice of Time Proportional Control. During any relay activation, a corresponding Green LED is illuminated. The Model 54e pH/ORP is compatible with either an external Pt 1000 or a Pt 100 RTD located in the sensor to compensate the pH reading for process temperature fluctuations. Manual temperature compensation is keyboard selectable. Processes with pH changes due to temperature can be compensated using a programmable temperature coefficient or isopotential point. ® SMART FAMILY is a registered trademark of Rosemount Inc. ® HART is a registered trademark of the HART Communication Foundation ¹ U.S. Patent No. 5,469,070