After any motor maintenance.
Once every quarter.
After 360 sampling hours.
The TE-5028 is the preferred method to calibrate the TE-PNY1123 MFC PUF
High Volume Air Sampler. It simulates change in the resistance by merely
rotating the knob on the top of the calibrator. The infinite resolution lets the
technician select the desired flow resistance. The TE-5028 calibration kit
includes: carrying case, slack tube water manometer, adapter plate, ’
piece of tubing, and TE-5028A orifice with flow calibration certificate.
Each TE-5028A is individually calibrated on a primary standard positive
displacement device (Rootsmeter) which is directly traceable to NIST.
** It is recommended by the EPA that each calibrator should be re-
calibrated annually. (1998 Code of Federal Regulations Parts 50 to 51,
Appendix B to Part 50, Reference Method for the Determination of
Suspended Particulate Matter in the Atmosphere, 9.2.5 page 29.)