Detecting a gas leak8
gas. HSM also amplifies this remaining information, which makes a moving gas cloud
stand out more clearly.
It is possible to adjust the sensitivity of HSM in a number of fixed steps, with different
combinations of time between the image frames and amplification. A higher sensitivity
value will allow you to see smaller variations, but there will also be more noise in the
image.
You will need to experiment with the sensitivity until you get a clear image of a verified
gas leak.
General guidelines:
• If you believe the gas leak is small or low in concentration, use a high sensitivity value.
• For large gas leaks, use a low sensitivity value.
8.4.1 Using HSM
To activate the High Sensitivity Mode (HSM), select Image mode > HSM on the main
toolbar.
Note You can also assign the function Toggle HSM to a programmable button, see sec-
tion 6.13 Programmable buttons.
When the HSM mode is active, a slider is displayed. Use this slider to change the HSM
sensitivity.
To change the sensitivity, do one of the following:
• Move the joystick up/down.
• Drag the slider by touching the screen.
8.5 Adjust the temperature scale
The camera continuously adjusts the temperature scale for the best image presentation.
By manually adjusting the scale to temperatures around the background of the gas, you
can make the gas appear more clearly.
For instructions on how to manually adjust the temperature scale, see section 7.3 Ther-
mal image adjustment.
Note Manual image adjustment is not possible in High Sensitivity Mode (HSM) mode.
8.6 Change the color palette
The camera uses a color palette to display different temperatures. Changing the color
palette can make it easier to see the gas cloud.
To change the color palette, select Color on the main toolbar.
8.7 Change the temperature range
The sensitivity of the camera can be controlled by changing the camera temperature
range. The selected temperature range also has an impact on the integration (exposure)
time. The optimal temperature range setting depends on the thermal conditions in the
scene.
A general guideline for gas detection is to start with the lowest camera temperature
range, which gives the highest sensitivity.
If there are warm objects in the scene, the image may become oversaturated. If this hap-
pens, you should change to the next temperature range. With a too low temperature
range, you risk to miss a gas passing in front of the warm objects.
#T810605; r. AD/92464/92464; en-US
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