* * Note this page is base off of the Canadian Brewer Spectrometer Network's (CBSN) Operator SOP which is Alert Global Atmosphere Watch (GAW) lab wiki document prepared by Kevin Rawling and Michael Brohart and how the CBSN operates their brewers * *

Brewer spectrophotometers track the Sun or Moon, and use a spectrometer combined with a photo-multiplier tube to take high-precision measurements of the intensity of ultraviolet light reaching the Earth’s surface. These measurements are taken at the absorption wavelengths of ozone, which allows the total amount of stratospheric ozone in a column between the instrument and the Sun to be calculated.

Measurements made at this station are part of a worldwide network of 200+ currently operational Brewers in 40 different countries. Alert is the northernmost location in this network, while the Amundsen-Scott station at the South Pole is the southernmost. The data from these instruments are collected and analyzed to create a model of the Earth’s stratospheric ozone cover.

Tools and material required

• Methanol
• Kim wipes
• Nitrile Gloves
  • Wear a glove to prevent methanol from contacting the skin.
  • Re-use glove if completely intact

	Methanol is toxic. Avoid inhaling and skin contact. Please wear nitrile gloves when using methanol

Procedure

1. Visual inspection and cleaning of the dome and window should be done daily
2. Remove any snow accumulation using a non-abrasive soft-bristled brush
3. Moisten a Kimwipe with methanol and clean the Brewer dome and windows complete to their edges
4. If there is any ice accumulated on the window/dome, that can easily be removed, gently do so. Ensure hard objects do not accidentally come in contact with the quartz glass. (e.g. rings worn on the hands). If the ice is firmly attached to the window/dome, apply a small amount of methanol directly to act as a deicer and allow the heater inside the Brewer will slowly melt the ice over time.

	Never chisel the ice off the dome or window! Since glass is not fully transparent to UV wavelengths, the domes and window are made from precision-machined fused silica (quartz) which makes them extremely expensive to replace!

1. Check if the Julian day and time in the brewer software is correct
   1. If the Brewer software is more then five (5) seconds off, report it in the addition notes section of the

log form and contact the Brewer Support.

1. Update the time by performing the following
   1. In the brewer software window, press HOME to get into the main menu (This may take a few minutes depending on what the Brewer is currently doing.
   2. Once the software gets to the menu, type 'pdtdfrhphgcn' HOME. This will update the time, move the micrometer to the proper measuring positions and restart the schedule.
   3. if the dosbox is not responding, you can double click the dosbox icon to restart the dosbox. (Please note this in the logs if this was done)
2. If the brewer was not running a schedule,