Product information Wireless data loggers
TAB. 5: Number of data loggers in the system as a function of the data
transmission interval
Data transmission
interval
Number of data loggers manageable
by the base unit
Data transmission
interval
Number of data loggers manageable
by the base unit
1 s
12
10 s
120
2 s
24
15 s
180
5 s
60
> 30 s
254
Table 5 refers to the case of direct connection among the base unit and the data loggers (1 “Hop”) in HD35…
.E
(868 MHz) and HD35…
.U
(902-928 MHz) systems. If repeaters are present, the transmission of the data requires more time and the number of data loggers man-
ageable by the base unit could be lower than that reported in table 5.
The number of devices in the system (base unit + rep data loggers) should not exceed 255.
Terminal header in the model HD35EDH
The model HD35EDH is equipped with three terminal header inputs. Each input can be configured as input for: Pt100/Pt1000, thermocouple,
0/4…20 mA (the shunt resistance is internal), 0…50 mV, 0…1 V or potentiometer. Only input 3 can also be configured as pulse counter (count-
ing of switchings of a voltage-free contact).
Input 1
Input 3
Input 2
3-wire Pt100 / Pt1000
ON/OFF
contact
4-20 mA transmitter
Example of connection of HD35EDH model inputs
HD35ED-ALM alarm module
LEDs
External RF
antenna
Connection
push-
button
Relays contacts
(protected by cover)
Power supply
Internal 3.6 V lithium-thionyl chloride (Li-SOCl
2
)
not
rechargeable
battery, size A, Molex 5264 2-pole
connector
Battery autonomy
1 year in typical operating conditions
(
the actual autonomy depends on how often the
alarm condition is generated
)
Transmitting frequency
868 MHz, 902-928 MHz or 915.9-929.7 MHz
depending on the model
Antenna
Internal
Transmitting range
See table 2
Keyboard
Push-button for connection / PING (for testing RF)
LED indicators
Presence of alarm, battery charge level,
RF communication status.
Relay
2 bistable relays with voltage-free contact
Contact: max 1A @ 30Vdc resistive load
Working temperature and
humidity range
-10…+70 °C / 0…85
%RH not condensing
Housing
Plastic material
Dimensions 135 x 110 x 33 mm
Weight
200 g approx. (including battery)
Installation
Wall mount support (
supplied
) for removable
installation or flanges (
optional
) for fixed installation
30