Comet U0110G, User Manual

Page: 20 / 73

20
IE-LGR-UxxxxM-23
U3120M, U3120G
Compact thermometer -
hygrometer
This model is designed to measure temperature,
relative humidity and dew-point temperature by internal
sensor, no additional probes or sensors can be connected.
It is characterized by a simple and compact design
and a relatively long response to a temperature and
humidity change, compare to model with external probes.
The sensors are located under the grid on the front of
the device. The device is suitable for measuring in places
where there is no rapid change in temperature or relative
humidity, and there is no condensation of water vapours.
If water vapour condensation occurs inside the datalogger,
then the resulting water will remain there and may
damage its electronics. The device is placed directly
in the measured area, while the installation needs to
ensure sufficient level of mobile signal at the installation
location. As the internal battery creates a parasitic heat
during the charging period, the measurement accuracy
may be affected by up to 1 º C.
We recommend calibrating the relative humidity
and temperature of this device in the laboratory
with a sufficient air flow (at least 1 m / s), the reading can
be performed only after thorough settling, which can take
up to 4 hours.
U3121M, U3121G
Thermometer
– hygrometer
for external probe
This model measures temperature, relative humidity
and dew point temperature using an outdoor COMET
Digi/E series probe. Its response to the temperature
or relative humidity change is significantly faster than by
models with internal sensor. This model is often utilized
to monitor areas in which only the probe is installed,
whereas the main unit is installed elsewhere. When
monitoring remote areas, the maximum probe line wire
must not exceed 15 m. The Digi/E series probes provide
calibrated measurement values. Hence, they may be
replaced without having to modify the device setup.