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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