C2AI HD35 User manual

Product Information
Wireless data loggers
REF. HD35
Wireless data loggers
Wi-fi / Ethernet
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Agriculture &
Greenhouses
Pharma - Medical
Laboratories - Storage
HD35 Wireless data logger
One system
Unlimited applications
Museums - Buildings - Hall
- Public Places - Institutions Food - Warehouses
Renewables Meteo - Hydro General industry

Product information Wireless data loggers
3
Introduction to the wireless data recording systems
A data recording system is a set of instruments which allows measuring and storing the values of certain physical quantities, such as
temperature, humidity, pressure, solar radiation, etc.
A data recording system is generally made of:
- Sensors: they are placed at the measuring points and convert the values of the physical quantities into electrical analog or digital
signals.
- Acquisition system: it reads and logs the electrical signals outgoing from the sensors. If the acquisition system is digital, the ac-
quired values are kept in the system’s internal memory until the memory is full.
- PC: the transfer of data from a digital acquisition system to a PC allows storing the measured values even after the internal memory
of the acquisition system is full. The PC also allows processing and analyzing the acquired values.
SENSOR
SENSOR
ACQUISITION
SYSTEM PC
Data recording system
Connecting the components of the system
The components of the recording system can be connected in two different ways:
- Wired connection
- Wireless connection by radio frequency transmission
The type of connection depends on various factors, such as:
- the distance among the various components of the system;
- ease of installation;
- cost of installation;
- possibility to easily modify the system;
- electromagnetic interferences in the environment of installation.
Advantages of the wireless connection
- Quick and easy installation: as it is not necessary the laying of cables and conduits, a wireless system is installed much more easi-
ly and quickly than a wired system, especially when the components are at a great distance from one another.
- Reduction of installation costs: the absence of cables allows a considerable saving in cost of material and labor.
- Flexibility of the system: the absence of fixed links between the various parts allows moving the system components at any time
without problems.
- Low maintenance: the cables are subject to deterioration over time, the absence of cables reduces the maintenance costs of the
system.
Contraindications of the wireless connection
The operation of a wireless system can be difficult in environments with excessive electromagnetic interferences (in which case a wired
shielded connection may be preferable) or in areas particularly shielded that hinder the radio transmission between the parts of the
system.
Product information Wireless data loggers

Product information Wireless data loggers
Radio frequency transmission in wireless systems
In the case of wireless connections, the acquisition system is made of a radiofrequency transmitting part and a radiofrequency receiving
part:
- Transmitting part: positioned near the sensor, it transmits the measured values to the receiving part. The transmitter part is normally inte-
grated in the measuring instrument to which the sensor is connected.
- Receiving part: positioned close to the PC, it receives the measured values and transmits them to the PC. The receiving part is usu-
ally indicated by the terms Base Unit or Access Point.
SENSOR
SENSOR
ACQUISITION
SYSTEM
TRANSMITTING
PART
ACQUISITION
SYSTEM
RECEIVING
PART
RF PC
Wireless data recording system
The transmitter part of the acquisition system can be unique for all the sensors or can be made of multiple transmitters, each of which
sends the measurements of some of the sensors. The receiving part of the system is the same for all sensors.
Wireless system
The basic HD35… series wireless system is made of:
- One or more devices of the series HD35ED…: the devices HD35ED... acquire the values measured by integrated or external sen-
sors connected via cable. The data are both stored in the internal memory of the device and transmitted via radio to the receiving
unit (base unit / Access Point). Most of the devices HD35ED… work with a battery and do not require power connections.
- Base Unit (Access Point) HD35AP…: it receives the measured values from all devices HD35ED... and sends them to the PC. The base
unit HD35AP… has an internal battery with limited autonomy, therefore it has to be powered externally by connecting it to a power
supply (optional) or to the USB port of the PC.
- HD35AP-S Software: once installed in a PC, it allows downloading and viewing the data, entering the data into a database and
configuring the system. The software can be downloaded free of charge
from the website.
Sensors and
acquisition system
with transmitting part
Sensors and
acquisition system
with transmitting part
Sensors and
acquisition system with
transmitting part
Sensors and
acquisition system with
transmitting part
Receiving part
(Base Unit/Access Point)
PC
PC
Receiving part
(Base Unit/Access Point)
Repeater
HD35RD...
HD35ED...
HD35ED...
HD35ED...
HD35RE...
RFRF
RF
RF
RF
HD35AP...
HD35AP...
Wireless data recording system
System configuration
The HD35… series wireless system can be fully configured through the basic software HD35AP-S. The RF communication
between the devices HD35ED... and the base unit HD35AP... is bi-directional, that is to say that it allows the base unit HD35AP... to transmit
to the devices HD35ED... all the changes in operating parameters generated by using the software HD35AP-S:
- The devices HD35ED… transmit the measured values to the base unit HD35AP…
- The base unit HD35AP… transmits the changes in the operating parameters to the devices HD35ED…
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Product information Wireless data loggers
5
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.

Product information Wireless data loggers
How to increase wireless area coverage
In order to increase the distance between the HD35ED... devices and the HD35AP...base unit, install one or more RF signal repeaters
HD35RE… between the devices and the base unit.
Sensors and
acquisition system
with transmitting part
Sensors and
acquisition system
with transmitting part
Sensors and
acquisition system with
transmitting part
Sensors and
acquisition system with
transmitting part
Receiving part
(Base Unit/Access Point)
PC
PC
Receiving part
(Base Unit/Access Point)
Repeater
HD35RD...
HD35ED...
HD35ED...
HD35ED...
HD35RE...
RFRF
RF
RF
RF
HD35AP...
HD35AP...
Wireless data recording system with repeater
The repeaters are also useful to increase the distance in the presence of obstacles, for example when the HD35ED... devices and the
base unit are installed in interior spaces separated by walls of reinforced concrete, or in adverse weather conditions, if the devices are
installed in outdoor environments.
Which transmission frequency should be used
The transmission frequency of the wireless system must be one of those of free usage in the country where the system is installed. It is
important to purchase the system with the correct frequency as the transmission band cannot be changed by the end user. e
offers the following alternatives:
- 868 MHz (in compliance with the European Standard ETSI EN 300 220)
- 902-928 MHz (in compliance with FCC U.S. part 15 section 247 and Industry Canada RSS-210 standards)
- 915,9-929,7 MHz (in compliance with Japanese standard ARIB STD-T108)
Immediate alarms
The HD35… series wireless system immediately signals the exceeding of the threshold values of the measures in the fol-lowing
ways:
- By an acoustic signal generated by the buzzer inside the devices.
- By highlighting the measures with errors on the PC monitor by means of the HD35AP-S software.
- By sending an SMS to the set phone numbers (only with the base units HD35APG… and HD35AP3G…).
- By sending an alarm e-mail to the set addresses (only with the base units HD35APG…, HD35AP3G…, HD35APW and HD35APR).
- By activating additional signaling or actuators via the optional remote alarm module HD35ED-ALM with relay outputs.
The system allows setting two alarm thresholds for each measured variable (lower threshold and upper threshold). The alarm is signaled if the
measured value falls below the lower threshold or rises above the upper threshold. The alarm hysteresis and delay can be configured for
each variable.
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Product information Wireless data loggers
7
HD35AP… – HD35RE – HD35ED…
The wireless data logging system
The wireless data logging system allows the monitoring of many physical quantities in various application fields. The data loggers
are available for the monitoring of:
- Temperature
- Humidity
- Atmospheric pressure and differential pressure
- Illuminance (lux)
- UVA, UVB and UVC irradiance
- Carbon monoxide (CO)
- Carbon dioxide (CO2)
- Solar radiation
- Rainfall quantity
- Wind speed and direction
- Leaf wetness
-Soil volumetric water content
- Level
- WBGT index
The models that measure relative humidity and temperature calculate derived humidity quantities. The calculated quantities depend on
the model and can be: Dew Point, wet bulb temperature, absolute humidity, mixing ratio, partial vapour pressure.
Depending on the model, the external measuring probes are connected to the data logger via M12 connector or screw terminal header.
Some of the models are equipped with built-in sensors.
Agriculture
Weather Museums
Photovoltaics
Industry
Warehouses
Food services
Carriage of goods

Product information Wireless data loggers
Transit area
Production Offices
Labs
Quality controlMonitoring room
Warehouse
Data logger
Data logger
Receiving unit
Data logger
Data logger
Data logger
Data logger
Exemple of monitoring of an environment composed of several
distinct areas
Example of application
Data loggers with terminal header inputs are available
for the connection of:
- Transmitters with 0÷20 or 4÷20 mA current output
and 0÷50 mV, 0÷1 V or 0÷10 V voltage output
- Pt100 / Pt1000 and K, J, T, N, E type thermocouple
temperature sensors
- Sensors with voltage free contact output (counting
of switchings) or potentiometric output
- Sensors with RS485 MODBUS-RTU output
This allows extending the monitoring capability of the
system to countless other quantities, in addition to
those listed above.
Typical application fields of the wireless data
logging system are:
- Food services (refrigerated containers, cold storage,
production and carriage of food)
- Health (storage of medicines, vaccines, blood, moni-
toring of incubators and operating rooms)
- Greenhouses and agriculture
- Environmental analyses (Air quality, meteorology
and hydrology)
- Monitoring of solar panels
- Museums and document archives
- Transportation of perishable goods
- Air conditioning
- Clean rooms
- Laboratories
- Industrial processes
- Buildings, offices, schools
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Product information Wireless data loggers
9
Data logger
Data logger
Data logger
Receiving
base unit
Database
PC
Data logger
Data logger
Data logger
Data logger
Data logger
Receiving
base unit
Receiving
base unit
Database
PC
Exemple of monitoring of an environment composed of several distinct areas
Example of monitoring of multi-storey buildings:
the data loggers upstairs communicate with a repeater; the repeater communicates with the base unit downstairs.
SINGLE HD35… NETWORK
ON A SINGLE FLOOR
SINGLE HD35… NETWORK
ON MORE FLOORS

Product information Wireless data loggers
Data logger
Data logger
Data logger
Data logger
Receiving
base unit
Receiving
base unit
Database
PC
Monitoring of perishable (food, medicines, etc.) or fragile goods during transport
Example of monitoring of multi-storey buildings:
use of a base unit for each oor; the base unit upstairs is connected to the PC via local network (Ethernet or Wi-Fi).
Datalogger Datalogger
Transport
Warehouse
and oce
Data download
Receiving base unit
Goods
loading
Goods unloading
INSTALLATION OF MORE HD35… NETWORKS
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Product information Wireless data loggers
11
Components of the system
The system consists of the following components:
- HD35AP…: base unit
- HD35RE…: repeaters
- HD35ED…: series of data loggers
- HD35ED-ALM: remote alarm module
HD35AP… base unit: the base unit is the interface between the data loggers of the system, placed in the measurement sites, and the PC.
It communicates wirelessly with the remote data loggers.
When connected to the PC via the USB connection, the base unit is directly powered by the PC USB port. In the absence of the
USB connection, the power is supplied by the internal rechargeable battery or by the external power adapter (optional). The use
of the external power adapter is necessary with the HD35APW and HD35APG…/HD35AP3G… versions.
HD35RE… repeaters: the repeaters are devices able to act as a bridge between the base unit HD35AP… and the remote data loggers HD-
35ED…. They allow the increase of the communication distance among the data loggers and the base unit. More repeaters can be
interposed between a data logger and the base unit to further increase the communication distance.
HD35ED… series of data loggers: the data loggers are the remote devices connected to the measuring probes. They are installed in
the environments to be monitored and are powered by the internal battery (not rechargeable) that allows a long working life.
The acquired measurements are stored in the internal memory and sent to the base unit automatically at regular intervals or
upon user request. Versions with or without LCD are available. The versions with LCD allow the measurements and the RF signal
quality to be viewed also at the installation site and allow the data logger configuration through the front keyboard too.
HD35ED-ALM remote alarm module: With relay outputs, the module allows to activate signalling devices (sirens, blinking lights, etc.)
or actuators.
The system can consist of up to 255 devices (including the base unit and any repeaters). Each device is uniquely identified by its own
address.
Thanks to the wireless transmission, the installation of the system is extremely simple and quick. The absence of cables allows a consid-
erable saving in cost of material and labor, and allows the system components to be moved at any time without problems. Furthermore,
it is not necessary to remove the data logger from its place or to go to the installation site to download the measured data into the PC.
Unit base versions
The base unit is available in the following versions:
- HD35AP, with the USB output only.
- HD35APD, with the USB output only. “Dongle” version powered only by the PC USB port (without internal battery and without input
for the external power supply).
- HD35APS, with:
oUSB output
oRS485 output with MODBUS-RTU protocol
The base unit acts as a multiplexer to address the MODBUS commands from the PC/PLC to the devices in the network.
- HD35APW, with:
oUSB output
oWi-Fi interface for the connection to the wireless local network
oEthernet interface for the cable connection to the local network
Permits (if the Internet connection via local network is available) sending alarm e-mail and the recorded data via e-mail, to an FTP ad-
dress and to an HTTP server (Cloud). The internal clock can be regularly synchronized automatically with a NIST reference server.
Allows using the MODBUS TCP/IP protocol (version of the MODBUS protocol for the communication via the Ethernet connection).
Multi-client feature: multiple PCs can be connected simultaneously via TCP/IP to the same base unit.
- HD35APR, version for 35 mm DIN rail, with:
oUSB output
oRS485 output with MODBUS-RTU protocol
oEthernet interface for the cable connection to the local network
The base unit acts as a multiplexer to address the MODBUS commands from the PC/PLC to the devices in the network.
Permits (if the Internet connection via local network is available) sending alarm e-mail and the recorded data via e-mail, to an FTP
address and to an HTTP server (Cloud).
Allows using the MODBUS TCP/IP protocol (version of the MODBUS protocol for the communication via the Ethernet connection).
Example of monitoring of multi-storey buildings:
use of a base unit for each oor; the base unit upstairs is connected to the PC via local network (Ethernet or Wi-Fi).

Product information Wireless data loggers
Multi-client multiple PCs can be connected simultaneously via TCP/IP to the same base unit.
- HD35APG / HD35APGMT / HD35AP3G / HD35AP3GMT, with:
oUSB output
ointegrated GSM/GPRS (HD35APG…) or 3G/GSM/GPRS (HD35AP3G…) module
Permits sending alarm e-mail or SMS and the recorded data via e-mail, to an FTP address and to an HTTP server (Cloud). The internal
clock can be regularly synchronized automatically with a HTTP reference server.
Allows the communication with the PC via the GSM/3G network through the GPRS/3G TCP/IP protocol.
The HD35APGMT and HD35AP3GMT versions are in IP 65 housing for outdoor.
Table 1 summarizes the differences among the various versions of base units.
TAB. 1: comparison among the versions of base units HD35AP...
HD35AP HD35APD HD35APS HD35APW HD35APR
HD35APG
HD35APGMT
HD35AP3G
HD35AP3GMT
Connection systems
USB üüüüüü
RS485 ü ü
Wi-Fi ü
Ethernet ü ü
GSM/GPRS ü
3G
Only HD35AP3G
HD35AP3GMT
Protocols
Proprietary on USB üüüüüü
Proprietary on TCP/IP üüü
Modbus RTU ü ü
Modbus TCP/IP ü ü
SMS commands ü
Data download
Automatical data download in
the Database üüüüüü
Sending of data via e-mail üüü
Sending of data to an FTP address üüü
Sending of data to an HTTP server
(Cloud) üüü
Alarms
Alarm thresholds üüüüüü
Alarm SMSes ü
Alarm e-mails üüü
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Product information Wireless data loggers
13
Base unit connection systems
ETHERNET
PC1
PC2
ETHERNET
ETHERNET
PC1
PC2
Wi-Fi
Access
Point
Wi-Fi Wi-Fi
HD35ED...
HD35ED... HD35ED...
HD35ED...
HD35AP...
HD35APD
Database
PC PC
WI-FI
Access Point
WI-FI e-mail FTP
HD35ED...
HD35ED...
HD35ED...
HD35ED...
USB direct connection between PC and HD35AP... base unit
Available in all the HD35AP... base units
Connection between PC and base unit via ETHERNET local network
Available in HD35APW and HD35APR
Power supply

Product information Wireless data loggers
HD35APw
Power supply
Database
PC PC Modem/Router
e-mail
FTP
ETHERNET
ETHERNET
HD35ED...
HD35ED...
HD35ED...
HD35ED...
>500 m
>500 m
300/180 m
300/180 m
PC
USB
Database
HD35APS
HD35ED...
HD35ED...
HD35ED...
HD35ED...
Other sensors Other sensors
Power supply
Connection between PLC and base unit via RS485 MODBUS-RTU network
Available in HD35APS and HD35APR
Connection between PC and base unit via Wi-Fi local network
Available in HD35APW
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Product information Wireless data loggers
15
GSM/3G connection
Available in HD35APG…/HD35AP3G…
e-mail
FTP
SMS
Modem/Router
GPRS/3G
TCP/IP
GSM/3G
HD35APG
HD35AP3G
HD35ED...
HD35ED...
HD35ED...
Power supply
The GSM/3G connection also allows the monitoring of moving systems at a great distance, as for example in the case of the transport of
perishable goods. Simply install the base unit in the moving system (for example inside a truck), in addition to the data loggers, to con-
stantly keep under control the measured parameters from a fixed location. The communication through the GPRS/3G TCP/IP protocol
allows interacting with the base unit, in order to know and change the configuration of the system at any time. SMS messages can be
sent to the base unit, to control the GSM/3G functions of the unit.
Transmitting frequency
All the models (except HD35APD and HD35APG…) are available in three versions, depending on the transmitting frequency band:
- 868 MHz (in compliance with the european normative ETSI EN 300 220);
- 902-928 MHz (in compliance with U.S. FCC part 15 section 247 and I.C. RSS-210 regulations);
- 915.9-929.7 MHz (in compliance with ARIB STD-T108 standard).
The base units HD35APD and HD35APG… are available only with 868 MHz or 902-928 MHz frequency band.
The 902-928 MHz frequency band can be reduced to 915-928 MHz (Australia) or 921.5-928 MHz (New Zealand).
The wireless transmission of the system is extremely robust against radio frequency interference. The system is able to detect any RF
interference in the transmission channel, and to transfer, upon request, the data communication to another channel of the same
transmitting band. The correctness of the transmitted data is ensured by the bidirectional communication between the base unit and
the remote data loggers.

Product information Wireless data loggers
Transmitting range and repeaters
To increase the distance between the base unit and the data loggers, the HD35RE... repeaters are used. More repeaters in cascade can be used
(“multi-hop” network). Depending on the RF frequency band, the typical transmitting range between two devices in open field (the range
could be reduced if there are obstacles between the devices) is:
TAB. 2:
transmitting range
HD35AP / HD35APS
HD35APR / HD35APW
HD35AP3G… / HD35RE…
HD35APG… HD35APD
868 MHz frequency band
HD35ED... with internal antenna 300 m 300 m 180 m
HD35ED... with external antenna / HD35RE... >500 m >500 m 180 m
902-928 MHz frequency band
HD35ED... with internal antenna 180 m 180 m 180 m
HD35ED... with external antenna / HD35RE... >500 m >500 m 180 m
915.9-929.7 MHz frequency band
HD35ED... with internal antenna 300 m --- ---
HD35ED... with external antenna / HD35RE... >500 m --- ---
>500 m
>500 m
300/180 m
300/180 m
PC
USB
Database
HD35ED...
HD35ED...
HD35EDW...
HD35EDW...
HD35AP...
HD35RE...
The repeaters are available in two versions:
- HD35RE: in housing for indoor, with external power supply and rechargeable internal backup battery;
- HD35REW: in IP 67 waterproof housing, with internal not rechargeable battery.
HD35REW is a low power repeater designed for environments where the external power supply is not available. To preserve the battery
life, the use of HD35REW repeaters is recommended in systems with not a large number of devices and that do not transmit the meas-
urements frequently.
Designing the system it should be taken into account that between a HD35REW repeater and a HD35ED... data logger or between two
HD35REW repeaters, only HD35REW repeaters can be interposed (HD35REW does not act as repeater for HD35RE).
RF signal repeater
More repeaters in cascade can be used
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Product information Wireless data loggers
17
Alarms
For each measured quantity, two alarm thresholds can be set by the user (higher and lower threshold). When a threshold is exceeded,
the internal buzzer of the data logger emits an acoustic signal and the alarm signal is immediately sent to the base unit and displayed
on the PC. If the base unit is equipped with the GSM/GPRS/3G module (HD35APG…/HD35AP3G…) or the Wi-Fi/Ethernet interface
(HD35APW/HD35APR) and the Internet connection is available, the alarm can be signalled by sending an e-mail. If the base unit is
equipped with the GSM/GPRS/3G module (HD35APG…/HD35AP3G…), the alarm can be signalled also by sending an SMS.
An alarm hysteresis and a delay in the generation of the alarm can be configured for each measured quantity. Alarm conditions according to
the quality of the RF signal can be generated.
A wireless remote alarm module with relay output is available (HD35ED-ALM), so to allow activating more signalling devices (sirens,
blinking lights, etc.) or actuators. The alarm module HD35ED-ALM works with all the versions of base unit.
USB
GSM
HD35ED...
HD35ED...
HD35AP...
HD35ED-ALM...
Only HD35APG… and
HD35AP3G…
Logging
Each data logger of the system can be configured with a different measuring and logging interval. The stored value is the average of the
measures acquired in the logging interval (except for the measurements that detect the maximum, such as wind gust, rain rate, …). The
transmitted data are also stored in the internal memory of the data logger; when the data logger memory is full, it can be chosen to stop
the logging or to continue overwriting the older data (cyclic logging). In addition to the individual loggers, after the transmission the
data are also stored in the internal memory of the base unit; in this way the system is extremely safe against any data loss and it is not
necessary to keep the PC always connected to the base unit. The memory of the base unit is managed cyclically.
Signallling the alarm

Product information Wireless data loggers
Software
The supplied PC basic software HD35AP-S, downloadable free of charge from the website, allows configuring all the devic-es of the
system, viewing the connection status, the RF signal level and the battery charge level of each device, viewing the real time
measurements both graphically and numerically, data downloading.
The data can be downloaded:
- automatically, at regular intervals;
- manually, upon user request.
The data downloaded in the PC are entered in a database. The transfer of the sensor measurements in the database occurs in stages:
1. the HD35ED... data loggers transmit automatically at regular intervals the measurements to the HD35AP... base unit (which stores the
measurements in its internal memory);
2. the data in the memory of the HD35AP... base unit are downloaded in the PC, automatically or upon user request, through the HD35AP-S
software;
3. the HD35AP-S software enters the downloaded data in the database.
Monitor
of measurements
Information and
status
of the devices
Selection of
time interval
Selection of devices
and quantities
Graph of
measurements
Conguration of
alarm thresholds
DATABASE
Conguration of units
of measurement
Conguration of
logging parameters
Measurements
The connection to the database is multi-client: it is possible to store the data in a remote database on the local network to which the PC
is connected and the data can be displayed from any PC on the local network running the software HD35AP-S.
The HD35AP-CFR21 option (working with hardware key) allows, in addition to the features of the basic software, the protection of
recorded data and configuration of the system in response to FDA 21 CFR part 11 recommendations. In particular are available:
- The traceability of activities (audit trail) performed with the software; for example, which users connected and what changes were
possibly made to the configuration of the system.
- The management of users access for the system configuration and viewing of data in the database. Each user can be assigned a
different password for using the software. There are also three levels of access (Administrator, Super-user and standard User); for each
level, the allowed operations can be defined.
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Product information Wireless data loggers
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Cloud
The base units equipped with Ethernet, Wi-Fi and GSM/3G connectivity can automatically send, at regular intervals, the data to an
HTTP server, and in particular to the portal.This allows you to view the data from anywhere in the world, even by using mobile devices
(tablet, smartphone, notebook), simply having an Internet connection and using a web browser. The data sending interval is configurable.
Configuration
The data logger equipped with LCD and keyboard can be also configured via the front keyboard. The access to the configuration param-
eters of the data logger via keyboard is password protected. There are two different passwords, one for the use of the data logger as op-
erator (access to some settings only) and one for the use as administrator (access to all the configuration parameters). The changes done
to a data logger configuration via keyboard are automatically transmitted to the base unit and also reported in the PC software, allowing
an always updated viewing of the system from the PC connected to the base unit. The base unit keeps also track of the system parame-
ters of each data logger (for example of the alarm thresholds, etc.); it is therefore not necessary to request the parameters to the various
data loggers to know the system configuration, just connect the PC to the base unit to immediately get all the information needed.
Internal clock
The internal clock of each data logger is continuously synchronized with the clock of the base unit, thereby eliminating any problems
due to the drift of the data logger clock. This ensures that the data loggers of the system have all the same time, feature particularly
useful if you want to compare the measures acquired by various data loggers at the same time.
If the base unit can connect to the Internet (via Wi-Fi, Ethernet, cellular network), the clock can be regularly synchronized automatically
with a reference server.
Indicators
The devices of the system are equipped with front LED indicating the communication status: any transmission difficulties due, for exam-
ple, to the excessive distance among the devices or to the presence of obstacles are immediately highlighted.
The devices also report the charge status of the internal battery and the status of the alarm. The indication is on the display for the mod-
els provided with LCD and through LED indicators for the models without LCD.

Product information Wireless data loggers
Installation
The practical wall mount plastic support allows quickly removing and replacing the devices of the system for service operations, for
example to change the battery or to periodically check the calibration at a laboratory. Alternatively, a fixed installation can be realized,
using the appropriate anodized aluminium alloy flanges to be fixed on the back of the instrument case. The use of the flanges makes it
possible to prevent the removal of the instrument thanks to the possibility of applying a security padlock, inserted in a pin to be fixed
to the wall.
Padlock
Pin
Flange
Plastic support Flanges and security padlock
Conformities
The data loggers are in compliance with the standard EN 12830.The PC application software HD35AP-S (advanced version with HD35AP-
CFR21 option) is designed in accordance with the FDA 21 CFR part 11 recommendations.
The display in the data loggers with optional LCD
Depending on the data logger model, the LCD is custom or graphic type. The models with custom LCD are identified by the Lletter in
the code. The models with graphic LCD are identified by the Gletter in the code.
All the various quantities measured and calculated by the data logger can be viewed on the LCD. In the models with custom LCD that
measure various quantities, the temperature is displayed in the secondary row.
Indications on the status of connection, logging (running/disabled) and battery charge level are provided.
Primary row
Battery
level
Logging
status
Secondary
row
Connection
status
Custom LCD
The models with graphic LCD allow viewing 3 measures at the same time in the secondary rows. The graphic display also shows the level
of the RF signal, date and time.
Logging status
Battery level
Date
Secondary rows
Connection status
RF signal level
Time
Primary row
Graphic LCD
The data loggers with LCD can display the measured values in different units of measurement. For example, in the models measuring
temperature the user can set °C or °F, or, in the models measuring atmospheric pressure, the unit of measurement can be set by the
user in: hPa (= mbar), mmHg, inchHg, mmH2O, inchH2O, atm.
The possibility to view information on the quality of the RF signal (Received Signal Strength Indication, Packet Error Rate) allows an easy
positioning of the devices during system installation.
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