10 Doc. 20780_03
Planning and Commissioning Manual ADPRO Passive-Infrared (PIR) PRO Series by Xtralis
During a walk test in thick fog (see below picture) the alarm went off clearly at a distance of
80 m. The oscilloscope ‘snapshots’ below the picture show the corresponding detector signal
values. Left, the value for 80 m; right, at a distance of a 100 m with the same detector
installed, the alarm threshold was nearly but not quite reached.
If the test subject had left a warm building and spent only a few moments in the cold,
fresh air, the alarm would have sounded at a distance of up to 120 m.
- Type of detector : 100H (without heating)
- Date and time : 21 November 2011, 8 a.m.
- Location : Xtralis, south side
- Type of ground : grazed pasture
- Height of mounting of detector : 4 m
- Visibility : c. 120 m (thick fog)
- Atmospheric pressure : 1021.3 mb
- Humidity : 94% (light dew, just forming ice)
- Air temperature : -1°C
- Ground temperature : -7° C
- Body temperature : -1° C. (The test subject wore a Gore-Tex (TM)
jacket)
- Head temperature : +19°C
The moisture of rain, hail and snow can affect the detection rate. However, since the
particles that form these are larger in diameter, sufficient radiation can penetrate
between them. Typically, these environmental conditions do not last a very long time.
In coastal areas, and near large lakes, this point of planning should be taken into
special consideration.
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