Model 54eA Amperometric HART® Analyzer/Controller
The Model 54eA Analyzer/Controller with the appropriate sensor monitors and controls dissolved oxygen (ppm and ppb level), free chlorine, total chlorine, and ozone in a variety of process liquids.
Click Here To Download:
•Datasheet: Model 54e
The Model 54eA Analyzer/Controller with the appropriate sensor monitors and controls dissolved oxygen (ppm and ppb level), free chlorine, total chlorine, and ozone in a variety of process liquids. The analyzer is compatible with Rosemount series 499A amperometric sensors for oxygen, chlorine, and ozone; and with Hx438 and Gx448 steam sterilizable oxygen sensors.
For oxygen measurements, an on-board pressure sensor allows truly automatic air calibration. Simply expose the sensor to water-saturated air. Wait until readings are stable and press a button. The analyzer measures temperature and barometric pressure and automatically completes the calibration.
For free chlorine measurements, both automatic and manual pH correction are available. pH correction is necessary because amperometric chlorine sensors respond only to hypochlorous acid. To measure free chlorine (hypochlorous acid plus hypochlorite ion) most competing instruments require an acidified sample. Acid lowers the pH and converts hypochlorite ion to hypochlorous acid. The 54eA eliminates the need for messy and expensive reagents by using the sample pH to correct the chlorine sensor signal. If the pH is relatively constant, a fixed pH correction can be used.
If the pH is greater than 7 and fluctuates more than about 0.2 units, continuous measurement of pH and automatic pH correction is necessary. Corrections are valid to pH 9.5.
The 54eA analyzer fully compensates oxygen, ozone, free chlorine, and total chlorine readings for changes in membrane permeability caused by temperature changes.
For pH measurements — pH is available with free chlorine only — the 54eA features automatic buffer recognition with stabilization check. Buffer pH and temperature data for commonly used buffers are stored in the analyzer. Glass impedance diagnostics warn the user of an aging or failed pH sensor.
The analyzer has a rugged, weatherproof, corrosionresistant enclosure (NEMA 4X and IP65) of epoxy-painted aluminum. It is suitable for panel, pipe, or wall mounting. A hinged front cover provides convenient access to wiring. Programming and calibration are through the front membrane keypad, which has tactile feedback. The large back-lit dot-matrix display shows the main measurement (oxygen, chlorine, or ozone) in large numerals. The temperature and output current are shown in smaller numerals on the second line. Two user-selectable variables can be displayed on the third line. The pH measurement, if used, appears on the third line.
Two independent, galvanically isolated outputs provide 4-20 mA or 0-20 mA signals for oxygen, chlorine, ozone, pH, or temperature. Output 1 includes a HART digital signal superimposed on the analog signal. The controller option allows PID control on any measurement.
The Model 54eA has three programmable alarm relays. Alarms can be assigned to the amperometric measurement, pH, or temperature. Alarms have programmable high or low activation, independent setpoints, adjustable deadband, and time delay. Any relay can be configured as a timer to control a spray cleaner for the dissolved oxygen sensor. An overfeed timer feature is also available. The controller option allows each alarm to be configured for time proportional control (TPC). A fourth relay is a dedicated fault alarm.
The Model 54eA analyzer is a member of the Rosemount SMART FAMILY® of instruments. The analyzer communicates with the Model 275 HART® communicator or any other host that supports the 275 HART communication protocol.
- MEASURES dissolved oxygen (ppm and ppb level), free chlorine, total chlorine, and ozone.
- ON-BOARD PRESSURE SENSOR for automatic air-calibration of oxygen sensors.
- SECOND INPUT FOR pH SENSOR ALLOWS AUTOMATIC pH CORRECTION for free chlorine measurement. No expensive reagents needed.
- AUTOMATIC BUFFER RECOGNITION for pH calibration.
- BACK-LIT DISPLAY with easy to use interface.
- TWO INDEPENDENT OUTPUTS for oxygen, chlorine, ozone, pH, or temperature.
- THREE ALARMS WITH PROGRAMMABLE LOGIC plus one dedicated fault alarm.
- INTERVAL TIMER operates spray cleaner for oxygen sensor in aeration basins.
- OPTIONAL TPC & PID CONTROL capability.
Click Here To Download:
•Datasheet: Model 54e