HD37AB17D/HD37B17D
- 5 -
V1.5
1. INTRODUCTION
HD37AB17D
and
HD37B17D
instruments are
dataloggers
able to simultaneously
measure and memorize the following parameters:
•
Relative Humidity
RH
•
Ambient temperature
T
•
Carbon Monoxide
CO
(
only HD37AB17D
)
•
Carbon dioxide
CO
2
HD37AB17D
and
HD37B17D
are instruments suitable to research and monitor the
air quality in internal environments.
Typical applications are the examination of the air quality in all the buildings where
there is a crowd of people (schools, hospitals, auditoria, canteens, etc.), in the work
environments in order to optimize the comfort and in the buildings in order to check if
there is a small emission of CO, with the risk of explosions or fires. This analysis al-
lows setting the air-conditioning unit (temperature and humidity) and ventilation (air
replacement/hour) in order to get a double purpose: getting a good quality of the air
according to ASHRAE and IMC regulations in force and an energetic saving.
HD37AB17D
and
HD37B17D
are instruments suitable to fight the so-called syn-
drome of the ill building.
RH
measurement (Relative Humidity) is obtained with a sensor of capacitive type.
T
temperature is measured with a high-precision sensor of NTC type
.
The sensor for
CO
(Carbon Monoxide,
only HD37AB17D
) measurement consists of
an electrochemical cell with two electrodes suitable to detect the presence of carbon
monoxide, lethal for man, in residential and industrial environments.
CO
2
(Carbon Dioxide) measurement is obtained with the special infrared sensor
(NDIR technology: Non-Dispersive Infrared Technology) that, thanks to the use of a
double filter and a special measurement technology, warranties precise and constant
measurements over the time. The presence of a protection membrane through which
is given off the air to check, protects the sensor from dust and atmospheric agents.
HD37AB17D
and
HD37B17D
are
dataloggers
able to memorize the detected
measurements, with a frequency prearranged by the user.
HD37AB17D
and
HD37B17D
connect to the PC through
USB
inlet.
The instruments are supplied with
DeltaLog13 Software
with which you can manage
the connection operations to the PC, the RH, CO (only HD37B17D) and CO
2
sensor
calibrations, the instrument working parameters setup, the data transfer, the graphi-
cal introduction and the acquired or memorized measurements print.
Through an appropriate procedure
,
the Software
DeltaLog13
can evaluate the pa-
rameter
% OA
(percentage of external air), according to the formula:
100
%
⋅
−
−
=
o
r
s
r
X
X
X
X
OA
whereas:
X
r
=
CO
2
in return air
X
s
=
CO
2
in the outlet air
X
0
=
CO
2
in the external air
