Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 143)

Operating Instructions Model 9110TH NOx Analyzer
Teledyne Analytical Instruments 123
4.13.5.5. Assigning a DAS Parameter to an Analog Output Channel
The 9110TH/M analog output channels can be assigned to output data from any of the
40+ available DAS parameters (see Table A-6 of Appendix A.5). The default settings
for the four output channels are:
Table 4-22: Analog Output Data Type Default Settings
PARAMETER
CHANNEL DEFAULT SETTING
A1 A2 A3 A4 3
DATA TYPE 1 NXCNC1 NOCNC1 N2CNC1 NXCNC2
RANGE 0 - 5 VDC 2
REC OFS 0 mVDC
AUTO CAL. ON
CALIBRATED NO
OUTPUT ON
SCALE 100 ppm
UPDATE 5 sec
1 See Table A-6 of 9110TH/M Appendix A for definitions of these DAS data types
2 Optional current loop outputs are available for analog output channels A1-A3.
3 On analyzers with O
2
sensor options installed, DAS parameter O2CONC is assigned to output A4.
4.13.5.6. DAS Configuration Limits
The number of DAS objects are limited by the instrument’s finite storage capacity. For
information regarding the maximum number of channels, parameters, and records and
how to calculate the file size for each data channel, refer to the DAS manual
downloadable from the Teledyne API website at http://www.teledyne-api.com/manuals/
under Special Manuals.
4.13.5.7. Reporting Gas Concentrations via the 9110TH/M Analog Output Channels
While the DAS parameters available for output over via the analog channels A1 thru A4
include a vide variety internal temperatures, gas flows and pressures as well as certain
key internal voltage levels, most of the DAS parameters are related to gas concentration
levels.
Two parameters exist for each gas type measured by the 9110TH/M. They are generally
referred to as range 1 and range 2 (e.g. NXCNC1 and NXCNC2; NOCNC1 and
NOCNC2; etc.). These take the place of the high and low concentration ranges of
previous versions of the analyzer software. Concentrations for each range are computed
using separate slopes and offsets which are also stored via separate DAS parameters.
Note
If an analog output channel is set to report a gas concentration (e.g.
NXCNC1; NO
x
concentration; Range 1) it is generally a good idea to use
80% of the reporting range for that channel for the span point calibration.
If both available parameters for a specific gas type are being reported
(e.g. NXCNC1 and NXCNC2) separate calibrations should be carried out
for each parameter.