ENA/OZONE/C1 - Failing pump

The pump was failing, and the operator attempted a repair.  Eventually, the flow bypassed 
the pump internally and was replaced with an external HTDMA vacuum pump.  Data appear 
valid since the flow only affects the internal calibration source and not the ambient 
measurement.

Internal pump was repaired on 2016-09-20 11:00.  The flow returned to the nominal value 
decreased slightly).  The response to calibration increased proportionally (as expected 
given the lower flow rate and longer residence time in the O3 generator cell).  The 
instrument response to ambient O3 should not be a function of the flow rate.  HOWEVER, a slight 
discontinuity was noted in the ambient O3 values prior to this DQR and following this DQR 
end date.  The amount of uncertainty was judged as <5 ppbv.

Data are correct EXCEPT when flow is zero during Operator maintenance.

• ozone
• ozone_bench_temp
• ozone_pressure

• ozone_bench_temp
• ozone
• ozone_pressure

• Raw data stream - documentation not supported