Utilizing the method of gas phase titration, the Thermo Fisher Scientific method uses its 81i elemental calibrator as a source of mercury and a small cylinder of 250 ppm chlorine in nitrogen balance to form mercuric chloride inside a specially designed mixing chamber. The chamber is located in the probe to minimize transport of very reactive mercuric chloride. From the mixing chamber, newly formed mercuric chloride is fed directly into the probe at the filter to complete the system integrity check under the mandated Clean Air Mercury Rule (CAMR). The result is a system that requires no wet chemicals and no extra space as the generator is incorporated into the probe.
“Once again, Thermo Fisher Scientific has designed a completely integrated mercury emissions monitoring component that makes life simpler and easier for plant personnel,” said Michael Nemergut, marketing director for Thermo Fisher Scientific’s Air Quality Instruments business. “Thermo Fisher Scientific takes the difficulty out of weekly system integrity testing and renders it virtually trouble-free with the major advantages of dry system operation, at-the-stack conversion and automated control. Add to this that the system is 100 percent retro-fittable, and you have an ideal system solution for CAMR monitoring compliance.”