YZ Systems DTEX DX1000G/L Instructions & Operating Manual page 26

Section 5: Programming for Odor Concentra tion Operation
Conducting An Odor
Concentration Test: (cont.)
Step 12: Threshold Detection Level (TDL) Test:
position nose within 3/4 inch of the sniff chamber
and with valve closed sniff exhaust. If an unchar-
acteristic odor is detected allow the instrument to
operate for an additional 2 minutes. If uncharacter-
istic odor persists, perform an exhaust background
evaluation test as specified in Section 7 - System
Maintenance. Slowly open the flow valve and sniff
exhaust. Continue to open the valve and sniff,
getting breaths of fresh air between sniffs. Contin-
ue the procedure until the first hint of a new odor
is detected. This is the threshold detection level.
Threshold, as used here, is the minimum concen-
tration of a gas in air when one detects a new or
different odor (above the background/characteristic
odor of instrument). Remove nose from sniff cham-
ber.
Step 13: Press the Record Test Level (RTL) key
recording the threshold detection level*.
Step 14: Readily Detectable Level (RDL) Gas
Odor Test: again position nose within 3/4 inch of
the sniff chamber. Continue opening flow valve
until readily detectable odor of gas is attained. RDL
determination should be where Natural Gas / LPG
odor can be positively identified as Natural Gas /
LPG gas. Remove nose from sniff chamber.
Step 15: Press the Record Test Level (RTL) key.
*refer ASTM D6273-98 definitions
Y Z S y s t e m s • 8 8 2 5 N . S a m H o u s t o n P k w y W e s t • H o u s t o n , Te x a s • U S A • 7 7 0 6 4 • P : 2 8 1 . 3 6 2 . 6 5 0 0 • F : 2 8 1 . 3 6 2 . 6 5 1 3
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