14
G
Mounting and Installation
Putting in operation
After switching on the device, a self-test and tempering period follows.
This procedure takes 30 - 50 minutes,depending on the ambient conditions.
During this time the output analogue voltage differs from the actual measured value.
Switching point setting
A potential-free changeover contact is available as a switch output.
A switching point between 10 % and 95 % of the measuring range can be selected using
the SET potentiometer. The 10 % value is added to the fresh air limit of 400 ppm for CO
2
.
(600...1900 ppm with MR = 0...2000 ppm or 900...4700 ppm with MR = 0...5000 ppm).
With other measurands, the corresponding lower limit is used directly as a basis.
(VOC: 10...95 %, Temperature: +5...+48 °C, Humidity: 10...95% r.H.)
The assignment of the switch output to measurand is done via DIP switch (DIP 7 and DIP 8).
Offset
Each measuring channel has a separate offset potentiometer for subsequent adjustment of the measurement.
The adjusting range is ± 10 % of the measuring range.
Display
In the first line, the
measurements
with the corresponding
units
( CO
2
in
ppm
, VOC in
%
, temperature in
°C
, relative humidity in
% r.H.
)
are displayed in a cyclical series.
In the second line, the
switching status of the relay
is shown on the left as a circuit
(full
●
= relay energised; empty
○
= relay de-energised)
followed by the corresponding
indicator
(
C
for CO
2
;
V
for VOC;
T
for temperature;
H
for relative humidity in
% r.H.
)
and the
switchpoint value
is shown on the right.
