Essential Health & Safety Requirements | 31
Separate Gas Source Used As Reference
Configure sample system as shown in Figure 3-7b. Standard and optional conditioning
components (dryers, contaminant traps) should be strapped in the upright position to
support beams.
Dryer(s) must be vertical to avoid channeling (voids in the sieve).
A separate source (if present) should also be run through an oil/air separator to re-
move trace quantities of oil from the gas. Oil in the reference stream will cause rapid
contamination of the analyzer cell.
NOTE
NOTE
VALVE
SHUTOFF
SAMPLE
TO VENT
REDUCER
PRESSURE
VALVE
SHUTOFF
SOURCE
SAMPLE
PROBE
(OPTIONAL)
FLOWMETER
BYPASS
AREA
APPROPRIATE
VENT TO
SAMPLE
REFERENCE
UNIT
FIELD
(OPTIONAL)
TRAP
CONTAMINANT
(<1 ppm)
SIEVE DRYER
MOLECULAR
(OPTIONAL)
MOLECULAR SIEVE DRYER
SUPER-ACTIVATED
TO VENT
AREA
APPROPRIATE
VENT TO
PROBE
SAMPLE
REFERENCE
SOURCE
SAMPLE
(OPTIONAL)
FLOWMETER
BYPASS
VALVE
SHUTOFF
REDUCER
PRESSURE
UNIT
FIELD
GAS SOURCE
REFERENCE
VALVE
SHUTOFF
REDUCER
PRESSURE
(OPTIONAL)
TRAP
CONTAMINANT
(OPTIONAL)
MOLECULAR SIEVE DRYER
SUPER-ACTIVATED
(<1 ppm)
SIEVE DRYER
MOLECULAR
Figure 9.
Sample system using separate gas
source as reference.
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