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ATIM_ACW-PIR_UG_EN_V1.4
Operating modes of the PIR
Each device of the ACW-PIR range can be configured in 2 different radio operating modes. By default, the products are
delivered in "counting" mode.
a. Counting mode
In this mode, the product sends back a periodic frame containing the number of detections made in a time interval.
This mode is useful for analyzing the occupancy rate of a room or place during the day, or for counting passages of
people or vehicles at a specific location.
CAUTION: The methods for detecting presence may change from one product to another. Remember to refer to the
corresponding Optex documentation to learn more about the detection method.
Minimum time between 2 detections
5s minimum / 120s recommended
5s minimum / 120s recommended
5s minimum / 120s recommended
5s minimum / 120s recommended
From the minimum time between 2 detections Tm and the emission period of the sensor Te, it is possible to estimate
the filling rate of a room over the given period using the formula:
Tx = Nd / (Te / Tm) with Tx, the rate in %, Nd the number of detections done within the hour
Example: With a PIR-90-I configured for emissions every hour, which has counted 23 detections within a period.
Then: Nd = 23, Te = 60min, Tm = 2 min
Tx = 23 / (60 / 2) = 23 / 30 = 0.76 = 76%
The more the period Te is reduced, the more the product consumes, but the more precise we can be on this
measurement over time.
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