8.4 Working with alarms
You can choose between the following alarm outputs:
■ a silent alarm, which, will make the background of the corresponding measurement
function turn red when an alarm is triggered
■ an audible alarm, which, compared to the silent alarm, also triggers a ’beep’
A settings can also be made in the camera so that an alarm output takes into account
the reference temperature. A typical application when you would want to use an alarm
that takes into account the reference temperature is screening of people for face
temperature detection.
Firstly, the reference temperature is set by screening 10 persons with normal face
temperature. The camera puts each of these 10 results in an internal camera buffer
and calculates the average temperature value after having discarded the two highest
and two lowest values in the event of erroneous samples. Every time a new sample
is saved to the internal buffer, the oldest sample will be discarded and a new reference
temperature will be calculated ’on the fly’.
Using an alarm that takes into account the reference temperature means that an alarm
output will only be triggered if the temperature value exceeds the sum of the average
temperature value in the buffer + the user-defined delta alarm offset value.
8.4.1 Setting the reference temperature
ActionStep
Press the joystick to display the menu bar.1
Point to Buttons on the Setup menu and press the joystick.2
In the Buttons setup dialog box, press the joystick up/down to go to F1 or F2.3
Press the joystick left/right to select Update ref temp.4
Press the joystick to confirm the choice and leave the dialog box.5
Now point to Image on the Setup menu and press the joystick.6
Press the joystick up/down to go to Shutter period.
Although the shutter period works independently of other functions described in
this document, FLIR Systems recommends that Short is selected when using the
camera for detection of face temperature.
➲ Selecting Normal will calibrate the camera at least every 15th minute, while se-
lecting Short will calibrate the camera at least every 3rd minute.
7
Pointing the camera to the first person with a normal face temperature and pressing
the F1 or F2 button will display the message Sampled nn.n °C.
8
8
Publ. No. 1557966 Rev. a155 – ENGLISH (EN) – February 6, 2006 47
8 – Tutorials
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