Atec 8000, Operation And Maintenance Manual, Page: 33 / 80

Atmospheric Technology 27
Life (hrs) = 100,000/Average Ozone concentration at site.
The ozone scrubber is replaced by removing the top cover on the sampler and
removing the ¼” stainless steel sample line with fittings and the Teflon filter holder
on each side of the scrubber. Remove the two retaining knobs on the heater cover
and remove the cover, exposing the heater block and copper tube denuder.
Remove the insulation surrounding the heater block and carefully remove the
denuder. Install a new denuder and replace the insulation and heater cover.
Replace the sample lines and Teflon filter.
Perform a Sampler Leak Check by disconnecting the sampling line at the rear of the
instrument and capping the inlet. Use either the manual mode screen or schedule
button to start sampling through one of the ports and additional channels.. During
sampling, the cartridge flow in all channels should be very close to zero after
several minutes of sampling. If a flow is indicated (usually 0.03 slp or larger), the
interior lines should be checked for the presence of a leak.
7.4 Mass Flow Controller Calibration Procedure
Each mass flow controller should be calibrated on an annual schedule. The mass
flow controllers can be calibrated either electronically or manually. Manual
calibration consists of adjusting the zero (no flow) and span potentiometers on the
side of the mass flow controller using a reference flow standard. The potentiometers
can be accessed through holes in the flow controller housing. Electronic calibration
can be performed by inserting the appropriate calibration constants into the
advanced portion of the setup screen.
The calibration of the mass flow controllers can be changed by entering the
appropriate slope and intercept for each mass flow controller.
The calibration of the flow controllers in ATEC samplers with software version 5.0 or
higher requires a special calibration procedure because the analog-to-digital