Operating Manual V8.2/03.2017
Non Invasive Road Sensor
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
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5
Generation of Measurements
5.1
Current Measurement (act)
The value of the last measurement is transmitted when the current measurement value is
requested.
6
Operation Modes
The sensor can be operated in two different modes.
6.1
Normal Operation
Provided that the power supply is not limited, this mode is recommended because it is not
restricted.
In normal operation, the sensor continually measures and provides continuously updated
measurement values.
6.2
Energy Saving Mode
If the power supply is limited, it is possible to operate the sensor in energy saving mode. In
this mode the sensor samples only one time per minute. Between the measurements, the
sensor is switched to a standby mode. Thereby the power consumption is reduced on
average to lower than 35%.
6.2.1
Restrictions in Energy Saving Mode
Note:
Setting the sensor to energy saving mode has the following restrictions:
The sampling and data update rate is fixed at 1 minute.
The first 3 minutes after starting the device and during the measurement, the NIRS31-
UMB is running at full capacity, therefore, the supply has to be designed for full power.
The response time may be delayed.
In case of rapid changes of the road conditions (e.g. onset of rainfall) it is used to
measured more often to reduce the response time; thereby, the power consumption may
increase slightly.
In case of heavy traffic load, it is used to measured more often for a proper function of the
noise suppression; this maybe increase the power consumption
Very high traffic load can cause interference of the measurement.
Due to the low power, the sensor can freeze rather
