F:\MARKETING\TECHNICAL MANUALS\Air Samplers\DF Battery TECH MANUALS\DF-75 LPM SERIES.doc
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CALIBRATION VERIFICATION INSTRUCTIONS
General
The calibration of 75 LPM DF Battery Series air samplers should be verified periodically. Good air
monitoring practice guidelines recommend a minimum of at least once per year calibration frequency.
A calibration verification should be made immediately after each repair involving the Digital
Flowmeter, or the motor. Additionally, a calibration verification should be performed at any time there
is a suspicion of erroneous readings or if a different filter media is utilized than that upon which the air
sampler was originally calibrated.
A flow calibration instrument having an accuracy of ± 1% of full scale or better is recommended for
the calibration verification.
The calibration verification procedure involves the comparison of the flow value displayed on the
Digital Flowmeter Air Samplers to the flow value displayed on the reference calibrator. The filter
media to be utilized during sampling should also be utilized during the calibration process.
F&J recommends the utilization of either its CD-812-1 (110VAC) or CD-812E-1 (230VAC) 1%
accuracy Digital Airflow Calibrator as the reference flow device for the DF-75L-12 and DF-75L-Li.
The Compact Digital Calibrator has a moveable flow sensor to facilitate calibration in the field.
Connecting the calibrator to the Air Sampler:
To perform the calibration verification, adaptors are needed to interface the reference calibrator to the
air sampler inlet. For the DF Battery Series Air Samplers, the adaptor is mounted to the particulate
section of the filter holder and onto the flow output of the calibrator, as illustrated in Figure 5 below.
Figure 5 Calibration
Note:
Be sure to insert the proper filter media into the air sampler filter holder prior to
attaching the adaptor to the air sampler.
