FEATURES AND APPLICATIONS
Simplified operation and ease of maintenance are the key design features of Emerson's Rosemount Analytical Model 951C NOx Analyzer. Designed for source emissions analysis in Continuous Emission Monitoring Systems (CEMS), the Model 951C delivers top performance and reliability. With the thermoelectrically-cooled photomultiplier tube and temperature-controlled case, the Model 951C offers superior low-range performance.
Featuring precision of 0.5%, the Model 951C NOx Analyzer delivers accurate measurement over a wide selection of fullscale ranges. Simplified operation and maintenance of the Model 951C are assured by the convenience of front pull-out access to all serviceable parts and operating controls.
A 4½-digit, backlit LCD display ensures high visibility of concentration reading at all levels of ambient light. Designed for single range operation, the model 951C front panel includes recessed zero and span controls leaving a clean, modern instrument look.
The Model 951C NOx Analyzer features a heated, temperature-controlled, carbon-based converter for NOx analysis. This unique converter, operating at a relatively low temperature offers prolonged life and freedom from interference that may adversely affect other types of converters. Control of the converter temperature and a heater indicator lamp are provided behind the front panel for simple adjustment.
Since the analyzer's reaction chamber operates at atmospheric pressure, problems normally associated with auxiliary vacuum pumps are eliminated.
To minimize system response time, an internal sample-bypass feature provides high-velocity sample flow through the analyzer.
The Model 951C internally generates reactant ozone by exposing air to ultraviolet (UV) radiation from a source lamp.
The use of UV radiation to produce ozone eliminates the generation of spurious NO normally found in corona discharge type generators. To ensure safety during normal operation, the ozone generator operates at a temperature far below the ignition point of surrounding materials. A pressure activated switch quickly shuts off the ozone generator when reactant air or oxygen is removed thereby preventing lamp and analyzer damage from ozone build-up.
Low installation and maintenance costs are designed into the analyzer. The 19" rack mountable, unitized enclosure has all electrical and signal connections conveniently located behind a rear access panel.
The Model 951C offers four selectable fullscale ranges of 10, 25, 100, 250 ppm NOx with electronic zero and span controls for simple calibration adjustment. A mid range option is available including 20, 50, 200 and 500 ppm NOx. A high range option is available including 100, 250, 1000 and 2500 ppm NOx. Continuous recorder outputs of 0 to 5 VDC and 0/4 to 20 mA are available at rear panel terminals.
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