40 CFR 86.329-79 - System response time; check procedure.
(2) Introduce an HC span gas into the sampling system at the sample probe or valve V2 at atmospheric pressure. Simultaneously, start the time measurement.
(3) When the HC instrument response is 95 percent of the span gas concentration used, stop the time measurement.
(b) Option. If the following parameters are determined, the initial system response time may be generally applied to future checks.
(i) Determine by experimentation the minimum analyzer and bypass flow rates individually and in combination that will produce a response time as close as possible to 20.0 seconds per paragraph (a) of this section.
(2) Capillary flow analyzers. This procedure is applicable only to analyzers that have sample capillaries such as the HFID and CL analyzers. It is also assumed that the system has sample/span valves that perform the function of valves V9 and V13 in Figure D79-1.
(iii) Measure and record the response time from the sample/span valve(s) per paragraph (a) of this section.
(iv) The response time (step (iii)) can be determined by switching from the “sample” position to the “span” position of the sample/span valve and observing the analyzer response on a chart recorder. Normally, the “sample” position would select a “room air” sample and the “span” position would select a span gas.
(vi) Measure and record the response time from the sample/span valve(s) per paragraph (a) of this section.
Title 40 published on 2013-07-01
no entries appear in the Federal Register after this date.