Filter
Top Products
Model 9110TH NOx Analyzer Setup Menu
Teledyne Analytical Instruments 97
5.4.2.1. Analog Output Ranges for NO
x
, NO and NO
2
Concentration
The analyzer has three active analog output signals related to NO
x
, NO and NO
2
concentration,
accessible through a connector on the rear panel.
NO
2
Concentration
ANALOG OUT
A1 A2
A
3
A
4
+ - + - + - + -
Test Channel
or O
2
concentration
(if optional O
2
sensor
is installed)
NO Concentration NO
x
Concentration
Figure 5-1: Analog Output Connector Pin Out
The A1, A2 and A3 channels output a signal that is proportional to the NO
x
, NO and NO
2
concentrations
of the sample gas, respectively. The 9110T can be set so that these outputs operate in one of the three
following modes: single range mode, independent range mode, or automatic range mode (Section 5.4.3).
Additionally, the signal levels of outputs A1, A2 and A3 outputs can be:
Configured full scale outputs of: 0 - 0.1 VDC; 0 – 1 VDC; 0 – 5 VDC or; 0 – 10 VDC.
Equipped with optional 0-20 mADC current loop drivers (see Section 3.3.1.4 ) and configured for any
current output within that range analog output (e.g. 0-20 mA, 2-20 mA, 4-20 mA, etc.).
Together these two set of parameters allow the user a great deal of flexibility in how the instrument
reports NOx , NO and NO2 concentration to external devices. For example, Using the IND mode the
following configuration could be created:
A1 OUTPUT: NO
x
Output Signal = 4 – 20 mA representing 0-1000 ppb concentration values
A2 OUTPUT: NO Output Signal = 0 – 10 VDC representing 0-500 ppb concentration values.
A3 OUTPUT: NO
2
Output Signal = 0 – 5 VDC representing 0-500 ppb concentration values.
The user may also add a signal offset independently to each output (see Section 5.9.3.9) to match the
electronic input requirements of the recorder or data logger to which the output is connected.
IMPORTANT
IMPACT ON READINGS OR DATA
The instrument does not remember upper range limits settings associated
with the individual modes. Changes made to the range limits (e.g. 400 ppb
600 ppb) when in one particular mode will alter the range limit settings
for the other modes.
When switching between reporting range modes, ALWAYS check and