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Instruction Manual
IM-103-400A, Rev. 1.0
December 2008
Table 1-4. Fuel Gas vs.
Analyzer Characteristics
Output Options
Range ID
Figure 1-9. Remote Range ID
Logic Diagram
Sample Pump Option
Analyzer Characteristics
Full Scale Sensitivity
Fuel Composition
Operating Range for
Sample Pressure Regulator
The standard analyzer provides (a) direct digital readout in percent of full
scale on a front-panel display calibrated linearly from 0 to 100%, (b) a
selectable buffered output of 0 to 5.0 VDC, 0 to1 VDC, or 0.1 VDC.
An isolated output of 4 to 20 mA DC (max. load resistance 700 ohms) is
obtainable through use of the optional current output board (P/N
6A00302G01) installed during factory assembly or as a subsequent addition.
When this board is installed the Model 400A Analyzer provides a selectable
buffered output of 0 to 5.0 VDC, 0 to1 VDC, or 0 to 0.1 VDC.
This option provides the user with a remote range identity loop via a dry
contact relay output in the ladder logic. See Figure 1-9. This range ID option
allows for: 1) remote range control, 2) remote range identification, and
3) terminals for a flameout indication. The range ID option requires a
customer-supplied, external, 24 VDC power supply.
To provide the required sample flow, the sample gas must be under adequate
pressure when applied to the analyzer inlet. To permit analysis of gases at
atmospheric or sub-atmospheric pressure, the analyzer may be shipped with
a sample pump accessory, P/N 621062. Refer to Section 2, Installation, Fuel
and Air Requirements.
100% H
2
Adjustable from 1 ppm
to 2500 ppm CH
4
35 to 40 cc/min.
4 to 5 psig (27 to 34.5 kPa)
Model 400A
40% H
/60% N
or
2
2
40%H
/He
2
Adjustable from 4 ppm
to 1% CH
4
or 100 ppm to 10% CH
4
75 to 80 cc/min.
1.5 to 5 psig
(10.3 to t34.5 kPa)
1-15
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