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Teledyne API - Model 200EH/EM Operation Manual Operating Instructions
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Additionally A1, A2 andA3 may be equipped with optional 0-20 mA current loop drivers. A4 is not available for
the current loop option.
Table 6-19: Analog Output Current Loop Range
RANGE MINIMUM OUTPUT MAXIMUM OUTPUT
0-20 mA 0 mA 20 mA
These are the physical limits of the current loop modules, typical applications use 2-20 or 4-20 mA for the
lower and upper limits. Please specify desired range when ordering this option. The default offset for all
ranges is 0 mA.
All of these outputs can be configured output signals representing any of the iDAS parameters available on this
model (See Table A-6 of Appendix A.5 for a complete list).
The ability to select any one of the M200EH/EM’s 40+ iDAS data types coupled with the ability to select from a
variety of signal ranges and scales makes the analog outputs of the M200EH/EM extremely flexible.
Table 6-20: Example of Analog Output configuration for M200EH/EM
OUTPUT
IDAS
PARAMETER
ASSIGNED
SIGNAL
SCALE
A1 NXCNC1 0-5 V
A2 N2CNC2 4-20 mA
A3 PMTDET 0 - 1 V
A4 O2CONC 0-10 V
1
With current loop option installed
6.13.4.2. Physical Range versus Analog Output Reporting Ranges
The entire measurement range of the analyzer is quite large, 0 – 5,000 ppm for the M200Eh and 0-200 PPM for
the M200EM, but many applications use only a small part of the analyzer’s full measurement range. This
creates two performance challenges:
1. The width of the analyzer’s physical range can create data resolution problems for most analog
recording devices. For example, in an application where a M200Eh is being used to measure an
expected concentration of typically less than 200 ppm NO
x
, the full scale of expected values is only 4%
of the instrument’s full 5000 ppm measurement range. Unmodified, the corresponding output signal
would also be recorded across only 4% of the range of the recording device.
The M200EH/EM solves this problem by allowing the user to select a scaled reporting range for the
analog outputs that only includes that portion of the physical range relevant to the specific application.
Only the reporting range of the analog outputs is scaled, the physical range of the analyzer and the
readings displayed on the front panel remain unaltered.
2. Applications where low concentrations of NO, NO
2
and NO
x
are measured require greater sensitivity and
resolution than typically necessary for measurements of higher concentrations.
The M200EH/EM solves this issue by using two hardware physical ranges that cover the instruments
entire measurement range The analyzer’s software automatically selects which physical range is in
effect based on the analog output reporting range selected by the user:
04521C (DCN5731)