Teledyne 9110T Setup for Calibration with the Internal Span GAS Generator, CAL on NO2 Feature

Model 9110TH NOx Analyzer Calibration Procedures

9.3.2.SETUP FOR CALIBRATION WITH THE INTERNAL SPAN GAS GENERATOR

Connect the sources of zero air and span gas as shown in Figure 9-4.

Figure 9-4: Pneumatic Connections for Manual Calibration/Checks with the Internal Span Gas Generator

9.3.3. CAL ON NO2 FEATURE

When using the IZS option to calibrate the 9110T, the analyzer’s CAL_ON_NO2 feature must be turned on. This feature enables a continuous zero gas flow across the IZS permeation tube and through the NO2 converter. It also programs the analyzer to use the NO output from the NO2 converter to calibrate the span value of both NO and NOX.

Note	This feature should only be enabled when a span calibration or calibration
	check is performed.

While CAL_ON_NO2 is enabled, the NO2 concentration will always be reported as zero. This is because the gas is continuously routed through the NO2 converter and the analyzer’s firmware simulates calibration with NO gas.

Table 9-1: IZS Option Valve States with CAL_ON_NO2 Turned ON

Valve	Condition	Valve Port Connections
Sample/Cal	Open to zero/span valve	1  2
Zero/Span	Open to SPAN GAS inlet	1  2
NO/NOx Valve	Open to NO2 converter	1  2
Auto Zero Valve	Cycles normally	N/A

Since the instrument sees the same concentration of NO during both NO and NOX cycles, it reports an NO2 concentration of zero.

TO turn the CAL_ON_NO2 feature ON/OFF, press:

Teledyne Analytical Instruments 203