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Product information Wireless data loggers
Choosing the base unit HD35AP...
The base unit HD35AP... is available in various versions. The choice of the base unit is independent of the type of measure to be accom-
plished, but it must be carried out according to how we want to connect the unit to the PC, PLC or Internet:
- USB connection, available in all the HD35AP... versions. The base unit should be installed near the PC and requires an external
power by connection to a power supply (optional) or to the USB port of the PC.
- RS485 with MODBUS-RTU protocol connection, available in HD35APS and HD35APR. This version is particularly suitable for con-
nection to a PLC via a multi-point RS485 network. It requires external power by connection to a power supply (optional).
- Ethernet connection, available in HD35APW and HD35APR. This version is suitable if there is a wired local network. It is not neces-
sary to install the unit near the PC, but it is sufficient to set it up near an access point in the local network. It requires external power by
connection to a power supply (optional).
- Wi-Fi connection, available in HD35APW. This version is suitable if there is a wireless local network. It requires external power by con-
nection to a power supply (optional).
- GSM/GPRS connection, available in HD35APG and HD35APGMT, or 3G/GSM/GPRS connection, available in HD35AP3G and
HD35AP3GMT. These versions are designed to operate even in the absence of a connection to the PC, being able to transmit
the data via e-mail, FTP or HTTP (Cloud) via the GSM/3G network. They are therefore suitable for monitoring data in unattended
installations and mobile installations (for example, during freight). They require an external power by connection to a power supply
(optional).
Choice of the HD35ED... devices
The devices HD35ED... that acquire measures are available in many versions which differ one to the other in the type of measures that
can be realized. The choice must be therefore made according to the following criteria:
- the type of variables that are meant to be measured;
- the need to have sensors connected by cable to the instrument or sensors integrated in the instrument;
- the need of having or not the LCD display in the instrument to see the measures and the RF signal quality directly on the instru-
ment display or configure the device via the front keypad;
- the fact that the measurement zone is in an indoor or outdoor environment (for example, for the detection of meteorological data in an
external environment, it is convenient to choose a model in waterproof housing with screen protection from solar radiation).
How many HD35ED... devices can be used
In the data recording system, it is possible to use many HD35ED... devices simultaneously, all of them communicating with the same
base unit HD35AP...
The number of devices to be used depends on:
- the number and type of quantities to be measured;
- the dislocation of the areas where the measures have to be carried out;
Examples:
- If it is requested to detect the temperature in two refrigerated cells placed side by side, it can be used a single device that can simulta-
neously measure two temperatures by using external probes (for example, HD35EDN/2TC).
- If it is requested to measure the temperature in two separate rooms or in two areas of a freight depot away a few dozen meters
from each other, it is necessary to use two separate devices (for example, two HD35EDNTV with integrated sensor).
It is possible to easily add to the system or remove from the system one or more devices HD35ED... at any time.
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