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Professional Series Thermal Imagers
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37
To improve the gas detection rate, place the Imager where:
• The temperature difference between the gas and the background environment is the greatest.
• There is a light wind.
• There is limited clutter in the background scene. A clear blue sky is optimal.
• The Imager is stable. When possible, use a tripod and High Gain (Tripod) mode.
• The Imager is close to the leak. If close proximity is not possible, use the 2X lens.
Table 17 lists the guidelines for the Imager to detect a gas leak based on the annual gas loss rate.
Table 17. Detection Guidelines
Annual Gas
Loss Rate
Guidelines
<10 lbs (<4.5 kg)
• The greatest possible difference between the gas and the background
environment temperatures
• Wind speed: <1.12 mps (<2.5 mph)
• Uniform background scene (clear blue sky)
• Imager on a tripod, close to the gas leak.
10 lbs to 50 lbs (4.5 kg
to 22,7 kg)
• ≥10 °C difference between the gas and the background environment temperatures
• Wind speed: <2.24 mps (<5 mph)
• Variable background scene (clear blue sky, high altitude clouds okay)
• Imager on a tripod.
>50 lbs (>22,7 kg)
• ≥3 °C difference between the gas and the background environment temperatures
• Wind speed: <4.47 mps (<10 mph)
• Variable background scene (high altitude clouds okay)
• Imager on a tripod or handheld.
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