3-12 | Thermox Series 2000 WDG-IV / IVC / IVCM
Calibration/aspirator air/Z-Purge Connections
Required calibration gases and tubing
See Chapter 2 for information on calibration gases. The span gas is
the high gas; the zero gas the low gas.
The span gas must be 10 times greater than the zero gas. For example, if
the zero gas is 1% O
2
, the span gas must be 10% O
2
or higher.
O
2
Span Gas
Instrument air (20.9%) or from 1.0% to 100% O
2
.
O
2
Zero Gas
From .1 to 10% O
2
, balance N
2
Combustibles Span Gas
If using a WDG-IVC analyzer, you must also have a combustibles span
gas as follows:
• 60 to 80% (ppm range) or 40 to 60% (% range) of the full combustibles
operating range in certified mixtures of CO or CO + H
2
, with an
equal amount of O
2
, balance N
2
.
For example, if using an operating range of 0 to 2000 ppm combus-
tibles, use 800 ppm CO, 800 ppm H
2
, 1 to 2% O
2
, balance N
2
. If using a
0 to 1% combustibles range, use 0.3% CO, 0.3% H
2
, 1 to 2% O
2
, balance
N
2
.
Combustibles Span Gas for 3-in-1
If using a WDG-IVCM analyzer with RTD-type combustibles detector,
you also must have a combustibles span gas as follows:
• 60 to 80% of the full combustibles operating range in certified mixtures
of CO (or CO + H
2
), 2% CH
4
, 8 to 10% O
2
, balance N
2
For example, if using an operating range of 0 to 2000 ppm combusti-
bles, use 800 ppm CO, 800 ppm H
2
, 1 to 2% CH
4
, 8 to 10% O
2
, balance
N
2
.
NOTE
Содержание Thermox Series 2000 WDG-IV
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Страница 59: ...Installation 3 27 Figure 3 20 Sensor connections with all sensor options ...
Страница 67: ...Installation 3 35 Figure 3 24 Series 2000 2 wire RS 485 communication connections ...
Страница 69: ...Installation 3 37 Figure 3 25 Series 2000 4 wire RS 485 communication connections ...
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Страница 143: ...Service and Parts 7 3 Figure 7 1 Wiring diagram for standard sensor ...
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