Description of the sensor:
The sensor consists of a plastic head containing sensors of temperature, relative air humidity and CO
2
concentration
and a terminal block for the connection of the supply cable. The plastic head consists of a base and a perforated cover,
providing access of air to individual sensors. The supply cable is attached to the terminal board through the opening in
the base. The base material of the sensor head is LEXAN
™ Resin EXL5689.
Temperature and relative humidity are measured by an internal sensor whose signal is processed in a microprocessor
and converted to an output signal. The CO
2
value is measured by an NDIR module whose digital signal is also
converted to an output signal.
“CO
2
” autocalibration – the function provides setting of the minimum CO
2
value corresponding to the outdoor
concentration level. The autocalibration process assumes that, during a measured period of approx. 8.5 days (without
interruption of the power supply), there will be at least one drop of CO
2
concentration to 400 ppm corresponding to the
outdoor concentration. In permanently occupied and non-ventilated rooms, however, this function will not work and must
be deactivated
– register “settings – bit 0”.
Installation of the sensor:
1. Before connecting the supply cable, detach the perforated cover from the plastic head base. Removing the cover
requires a working tool
–
a thin screwdriver, a metal tube with a tip diameter of 2 to 2.5 mm and a minimum length of
30 mm.
During this operation, take care to prevent mechanical damage of the sensing element
–
refer to
“
Cover removal
”
.
use the left hand to firmly grasp the base (bottom of the box)
insert the box opening tool as deep as possible into the left opening No. 1 in the direction of the arrow A (when
inserted, the tool is tilted at an angle parallel to the side wall of the box)
then, press the tool in the direction of the arrow B to dish the box cover and release it from its lock while slightly
lifting the cover from the base.
repeat the same procedure on the other side of the box, through the opening No. 2
when the cover has been unlocked on both sides, it can easily be separated from the base
Warning:
It is not advisable to open the box by pushing the side locks inwards
–
as it can lead to the locks breaking off
and losing their function of locking the base-cover connection. It can also result in mechanical damage to the
outer surface of the box.
Cover disassembly:
Drawing of the base:
2. Put the drilling template on the expected location of the sensor or at a location where the supply cable is lead out
from a wall and mark the position of drilling points with a diameter of 3 mm for the installation of the base and, if
necessary, also a drilling point with a diameter of 9 mm for the power cable.
The recommended working position
of the sensor is defined in such a way that the round section of the box is oriented downwards
–
refer to
“
Base drawing
”
.
Place for grasping the base
Hole for the
communication line and
power supply cable
9
Sensor
T & RH sensors
Hole for
screw
3
Hole for
screw
3
CO
2
sensor
position
1
2
