YZ Systems DTEX DX1000G/L, Инструкция и руководство по эксплуатации, Страница: 26 / 40

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Page 20 DX-1000G/L ver.05132020
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