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Section 1: First Things To Know About The DTEX
Theory of Operation
Two procedures for determining odor intensity are
outlined in ASTM D 6273, the Odorant
Concentration Method, and the Odor Intensi-
ty Method. Either, or both procedures may be
utilized with this DTEX instrument. The tests can
be conducted at any desired point in a gas trans-
mission or distribution system, as long as proper
test pressure is assured. The DTEX system can
accept inlet pressures from 5" water column, up to
5 psi. Any system pressure above this will require
a reduction regulator prior to the inlet of the DTEX
system. The gas stream to be tested enters the
DTEX system through the gas inlet connection. It
then passes through a low pressure regulator, and
on to the gas flow adjustment valve. This valve is
adjusted by the operator during a test to obtain
either Threshold Detection Level (TDL), Read-
ily Detectable Level (RDL), or % of Desired
Gas Concentration in Air. The gas then passes
through the electronic mass flow sensor, and on to
the mixing chamber where it is mixed with intake
air. A micro processor-based control algorithm is
employed to ensure constant fan speed at given
altitude and temperature. The air/gas mixture is
then delivered to the sniff chamber where it is
evaluated by the operator.
CAUTION:
*Prolonged use of sense of smell may result in olfactory
fatigue; therefore take all necessary steps to assure that
exposure to odroized gas is limited.
When the desired odorant test level is detected, the
operator simply pushes the "Record Test Level"
button once to record the test data into memory.
Additional notes may be added to the test data, as
required. Actual test results are visible to the oper-
ator at the main display after the test has conclud-
ed. Up to 75 separate tests can be stored in the
system. All data can be downloaded to a host PC
and periodically appended and permanently stored
creating a paperless audit trail of odorant level
detection tests. These tests can later be analyzed
for trends or other statistical information.
* ASTM D 6273
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
DTEX 1000G/L ver.05132020
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