A: No, you can not. This question arises because the barometric pressure shown on the GEM™2000 screen and attached to your readings is not corrected to sea level, nor is it temperature compensated. So, if you are taking readings at 3000 feet, your barometric pressure will be too low. If it is important that a corrected barometric pressure be attached to your readings, you should stamp your readings with the correct value after they're downloaded. The best way to know the correct barometric pressure is to have a professional grade barometer on site. If this is not possible, you can use a barometric pressure correction calculator online to derive the corrected pressure from the one the GEM displays. You can find one here: http://www.csgnetwork.com/barcorrecthcalc.html You stamp readings in the communication software after you download them from the instrument. Click on "Technician & Weather Stamping" and enter the correct barometric pressure and other information in the form that pops up.
A: A particulate filter removes small particles—dust, pollen and so forth—from the gas stream. This is important because particles degrade the instrument's performance and must eventually be cleaned out during servicing. The particulate filter is inside the GEM-2000 body, in the back behind the circular door with the large slot in it. The door can be opened with a quarter or something similar. Slide the quarter into the slot and turn counter clockwise. The particulate filter should be checked regularly, at least every three months, and replaced immediately if it is clogged.
A: The water trap is a filter that removes moisture from the gas stream. If you get liquid droplets in your gas sample, the water trap will prevent them from going into the body of your instrument. Otherwise, the GEM could suffer serious damage. If you are using a charcoal absorber filter, the water trap should come before the charcoal absorber. That is, the charcoal filter should be closer to the instrument.