Description: | An inexperienced AOS technician inadvertently closed off the flow to the dual-nephelometer
humidograph system during a Friday Preventative Maintenance. This resulted in liquid
water getting into the humidified nephelometer. Flow was restored to the system on Monday,
but the nephelometers were producing strange data. A number of tests were performed
over the next few days to remotely troubleshoot the situation, to no avail. Eventually, the
decision was made to pull both nephelometers and return them to Boulder for repair.
This DQR refers only to the humidified nephelometer, which was out of service for the entire
period from 000602 through 000703. |