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INTRODUCTION
The Delta OHM wireless data logging system allows several physical quantities to be monitored
in a large variety of application fields. Data loggers are available for the monitoring of:
•
Temperature
•
Relative humidity
•
Atmospheric pressure or differential pressure
•
Luminance (lux) and UV irradiance
•
Carbon monoxide (CO)
•
Carbon dioxide (CO
2
)
•
Solar radiation and rainfall quantity
•
Acceleration
The models that measure relative humidity and temperature calculate humidity derived quanti-
ties. Calculated quantities depend on the model and can be: dew point temperature, wet bulb
temperature, absolute humidity, mixing ratio, partial vapor pressure.
Data loggers provided with built-in sensors and data loggers with external probes are avail-
able. They can be connected through M12 connectors or terminals according to the model. The
data logger with terminal header input can be connected to:
•
Transmitters with 0÷20 or 4÷20 mA current output and 0÷1 V or 0÷50 mV voltage output
•
Pt100 / Pt1000 temperature sensors and K, J, T, N, E thermocouples
•
Voltage-free contact output (commutations counting) or potentiometric sensors
This allows the monitoring capability of the system to be extended to many other quantities in
addition to the ones mentioned above.
For each detected quantity, the user can set two alarm thresholds (high threshold and low thresh-
old). The overrun of the thresholds can be indicated by an audible signal of the data logger
through an internal buzzer; the alarm signal is immediately transmitted to the base unit and dis-
played on the PC. A wireless remote alarm module with relay output is available allowing other
signaling devices (sirens, flashing lights…) or actuators to be activated. If the system is equipped
with a GMS module, the alarm is signaled also by e-mails or SMS messages.
Systems with the following transmission frequencies are available:
868 MHz
(in compliance
with EN 300 220 European Directive),
902-928 MHz
(in compliance with U.S. FCC part 15
section 247 and I.C. RSS-210 Directives) and
915,9-929,7 MHz
(in compliance with ARIB
STD-T108 standard).
Thanks to wireless transmission, the installation of the system is a very simple and quick op-
eration. In addition, the user will not have to remove the data logger from its position or reach
the place where the data logger is installed to download the data measured with the PC.
The correctness of the transmitted data is ensured by the
bidirectional
communication be-
tween the base unit and the remote data loggers.
HD35AP-S
basic PC software supplied with the product allows configuration of all system de-
vices, display of connection status, level of the RF signal and battery charge level, data auto-
matic download at regular intervals or manual download on request of the user. The data
transferred to the PC are entered into a database. If the PC is connected to a local network, in-
stalling the advanced version of
HD35AP-PLUS
software (
optional
) allows also other com-
puters connected to the same local network to access the data stored into the database.
Data loggers comply with
EN 12830
standard. The PC application software
HD35AP-S
is de-
signed in compliance with
FDA 21 CFR part 11
recommendations: the operations are pro-
tected by access codes and, in the advanced version, a record of the performed operations is
kept.
