Teledyne T200, Operation Manual, Page: 189 / 425

Teledyne API
– T200 NO/NO
2
/NO
X
Analyzer Operation Manual Calibration Procedures
187
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.
VENT
here if input
is pressurized
Source of
SAMPLE GAS
(reconnected after
“precision” cal
performed)
PUMP
Enclo
sure Wall
External Zero
Air Scrubbe
r
Filter
Chassis
SAMPLE
EXHAUST
ZERO AIR
FROM DRYER
Figure 9-4: Pneumatic Connections for Manual Calibration/Checks with the Internal Span Gas
Generator
9.3.3. CAL ON NO
2
FEATURE
When using the IZS option to calibrate the T200, the analyzer‟s CAL_ON_NO
2
feature
must be turned on. This feature enables a continuous zero gas flow across the IZS
permeation tube and through the NO
2
converter. It also programs the analyzer to use the
NO output from the NO
2
converter to calibrate the span value of both NO and NO
X
.
Note This feature should only be enabled when a span calibration or calibration check
is performed.
While CAL_ON_NO
2
is enabled, the NO
2
concentration will always be reported as
zero. This is because the gas is continuously routed through the NO
2
converter and the
analyzer‟s firmware simulates calibration with NO gas.
Table 9-1: IZS Option Valve States with CAL_ON_NO
2
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/NO
x
Valve Open to NO
2
converter 1  2
Auto Zero Valve Cycles normally N/A
Since the instrument sees the same concentration of NO during both NO and NO
X
cycles, it reports an NO
2
concentration of zero.
06858E DCN7057