Thermo Scientific TruNarc User Manual page 20

2
Performing a Scan
Follow these safety practices whenever you scan a substance:
Maintain at least 14 inches (35 cm) of distance between the analyzer and
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your eyes. (This distance is the Nominal Ocular Hazard Zone Distance, or
NOHD.)
Never point the TruNarc analyzer at anyone's eyes.
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Never operate the TruNarc analyzer when the laser aperture is cracked (to
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locate the laser aperture, see the illustration on
cracks, make sure that the analyzer is turned off (see
nose cone, and visually inspect the laser aperture. Always check the laser
aperture for cracks if you drop the analyzer.
When scanning material that may be thermally sensitive:
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• Use the Scan Delay feature to conduct scans from a safe distance, as
described in
• Do not scan the material in place if it is lying on filter paper or similar
cotton-fiber bases. Instead, place a sample of the material in a container
such as a plastic bag or glass vial and then scan the container.
• Use extra caution if the material is lying on a dark surface. Transfer the
sample onto a piece of firm white paper for safe scanning. If possible,
scrape the material into a small pile before you scan it, to ensure that
the laser sample point is within the sample and is not striking the
underlying dark surface. See below for an explanation of the sample
point for the TruNarc analyzer.
• Wear all necessary personal protective gear.
When scanning in vial mode, always uncap the vial to prevent a projectile
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hazard caused by the build up of pressure. Likewise, never stand directly
over the vial when scanning in vial mode.
Minimize the size of the sample to reduce the impact if the sample ignites:
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• Liquids ~ 300 ul (< 5 drops)
• Solids ~ 300 mg (size of a pea)
The heat sink may become warm to the touch when you perform many
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scans consecutively. The heat sink is a black area on the back of the
analyzer, adjacent to the back label. Avoid touching your fingers to the
heat sink when holding the analyzer during a scan.
18
TruNarc User Guide
Chapter 6.
page 9). To check for
page 12), remove the
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