Teledyne 9110T instruction manual Pneumatic Layout for Zero Scrubber and IZS OPT 50G

Model 9110TH NOx Analyzer Getting Started

HNO3 is a liquid at room temperature, so once the HNO3 is released by the permeation tube it condenses and collects along the 9110T’s wetted surfaces, While liquid HNO3 does not directly effect the quality of NOx measurements of the Model 9110T, it does give off small amounts of gaseous HNO3 which is converted into NO by the 9110T’s NOx  NO converter resulting in an artificially high NO2 concentration by 8% to 12%. This is particularly bothersome when 9110T is attempting to measure a zero point, such as during calibration, since the NO2 concentration will only reach a true zero point once the majority of the HNO3 coating the wetted surfaces has reverted to NO2 and this can take a very long time.

The 9110T includes a special HNO3 desorbed which eliminates any HNO3 given off by the permeation tube before it can be converted into NO by the analyzer’s converter.

PNEUMATIC LAYOUT FOR ZERO SCRUBBER AND IZS (OPT 50G)

Figure 3-27: Pneumatics with the Internal Span Gas Generator (OPT 50G)

Table 3-11: Internal Span Gas Generator Valve Operating States OPT 50G

MODE	VALVE	CONDITION	VALVE PORT
			STATUS
SAMPLE	Sample/Cal	Open to SAMPLE inlet	3  2

Teledyne Analytical Instruments 71