Consider these 5 tips and tricks when measuring NO, NO2, and NOx:
Avoid maintenance chores associated with an external desiccant column such as refilling the desiccant column and proper disposal of the desiccant. A low-maintenance, high-performance alternative is the permeation dryer method. The permeation dryer uses a membrane dryer to remove water from the air for the generation process of ozone. This method offers better linearity, variability in moisture removal, very low maintenance requirements, and consistent performance. To upgrade your existing instrument, contact Technical Support by email or by calling (866) 282-0430, option 2.
Design enhancements have been made to the perm dryer assembly, allowing for a smaller, more compact design. The new design is optimized to eliminate friction so tubing is less susceptible to tears, holes and other damage. To order the new design, contact Customer Service by email or by calling (866) 282-0430, option 1. If the analyzer doesn't have a perm dryer installed already, you need to purchase the perm dryer, part number 113982-00 plus additional parts. If the analyzer already has a perm dryer and you want to replace the perm dryer you can just order the perm dryer, part number 113982-00.
The ozone cleanser has 4 purposes:
Replacing the ozone cleanser should be part of annual maintenance. To replace the ozone cleanser, disconnect the tubing from the top and bottom of the cleanser. Remove the cleanser from the mounting clips and then install the replacement cleanser on the mounting clips. Reattach the tubing to the top and bottom of the ozone cleanser and your instrument is up and running! To order an ozone cleanser, email or call customer service at (866) 282-0430 option 1 and request part number 101016-00.
When choosing between a stainless steel converter and a molybdenum converter, consider application, process environment, and accuracy demands. As a rule of thumb, coal-fired, ambient, and dilution applications should run molybdenum (also known as moly) converters, and gas turbines should use a stainless steel converter.
Determining the appropriate converter also depends on specific factors in the process. To achieve best results for low level concise accuracy, opt for a moly converter. When high levels of NO2 are present, a stainless steel converter is longer lasting and a more economical alternative. If ammonia slip is suspected and you’re using stainless steel converter, add an ammonia scrubber since ammonia might be present in the sample. Contact Tech Support for additional recommendations.
A procedure for performing converter efficiency tests may be regulated in order to document the analyzer is collecting data of known quality. If this is the case for your process, an approved method for conducting a converter efficiency test is required. For ambient applications, refer to National Primary and Secondary Ambient Air Quality Standards, 40 CFR Part 50, Appendix F or refer to the instruction manual for your instrument. For the measurement of nitrogen oxides (NOX) operators of stationary sources, refer to METHOD 7E—Determination of Nitrogen Oxides Emissions from stationary sources (Instrumental Analyzer Procedure).