18
2. INTRODUCTION TL-ALU9 ALARM UNIT
The alarm unit registers for each sensor the measurement together with the
date and time stamp.
With the TL-ALU9 wireless alarm unit you can generate an alarm when a
sensor reaches the alarm setting. The TL-ALU9 can be simply programmed
with a PC. The Alarm setting can be a temperature or voltage but also the
state of a switch.
When the alarm setting is triggered it will give for an period an Acoustical
alarm and continues a light alarm until the alarm is reset.
The TL-ALU9 displays all sensor data, which have been transferred by
temperature sensors. It is also possible to show the sensor data in a small
graph on this display.
the AREXX multilogger sensors continuously register and report new values
to the receiver at intervals of ca. 45 seconds.
Sensors and receiver use a wireless communication system, working at
433MHz. This frequency is freely available for communication at transmit-
ting powers under 10 milliwatts.
Depending on surrounding building constructions, the allowed 10mW power
level allows a transmission range of 20-40 meters.
Temperature sensors may be located inside or outside buildings, at any
place where an overview of temperature curves is desired.
Unreliable signal levels may be improved substantially by slightly
modifying the sensor’s or the receiver’s location.
E
N
G
L
I
S
H
