AZI Customer Service 800-528-7411 or 602-470-1414
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Zero Air Filter (AZI P/N Z2600 3905)
The Zero Air Filter (AZI P/N Z2600 3905) removes hydrogen sulfide, mercury vapor and
mercaptans from the air sample. Readings with the filter installed should be near 0.000 ppm (or
0.00 ppb). For maximum accuracy, wait 15 seconds between samples to allow the sensor to
restabilize.
Because air that is cooler than the instrument will cause low readings and warmer air will cause
higher readings, the Zero Air Filter should be used to equilibrate the instrument to ambient air.
Repeated sampling with clean air will not cause saturation of the gold film sensor but will
equalize temperatures faster to allow accurate analysis to begin sooner. For maximum accuracy,
wait 15 seconds between samples to allow the sensor to restabilize.
The Zero Air Filter can also be used to identify contamination within the instrument. If the
readings do not reduce to near 0.000 ppm with the filter installed, contamination should be
suspected. If the readings do drop to near 0.000 ppm with the filter installed but elevate with the
filter removed, the presence of hydrogen sulfide at the sampled location is confirmed. Again, for
maximum accuracy, wait 15 seconds between samples to allow the sensor to restabilize.
The Zero Air Filter should be inserted into the intake of the instrument when running the
instrument Warm-up.
For more information on the use of the Zero Air Filter, contact customer service at 1-800-528-
7411 or 1-602-470-1414.
