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HD35RD...
Product information Wireless data loggers
Sensors and
HD35ED...
HD35AP...
acquisition system
with transmitting part
PC
Receiving part
How to increase wireless area coverage
Sensors and
(Base Unit/Access Point)
acquisition system with
In order to increase the distance between the HD35ED... devices and the HD35AP...base unit, install one or more RF signal repeaters
transmitting part
HD35RE... between the devices and the base unit.
RF
RF
HD35ED...
Sensors and
HD35ED...
HD35RE...
HD35AP...
acquisition system
PC
with transmitting part
Repeater
Receiving part
Sensors and
(Base Unit/Access Point)
acquisition system with
transmitting part
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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