Xylem iRIS 150 GPRS DATALOGGERS - Manual (Page 12)

iRIS 150 V1.11 User Guide - 6
6 iQuest (NZ) Ltd - PO Box 15169, Hamilton, New Zealand Tel: +64 7 857-0810 Fax: +64 7 857-0811 Email: [email protected]
4 Hardware Description
4.1 Mounting
The iRIS 150 can be mounted to almost any surface by using suitable screws through the two internal
mounting pillars. These are exposed by removing the lid.
4.2 I/O Connector
All I/O and power supply terminations are via a small 12 way screw terminal block. The functions of the
connector terminals are shown in the table below.
Abbreviation
Description
AI1 Analogue Input #1
GND Ground (Analogue)
AI2 Analogue Input #2
GND Ground (Analogue)
DI1 Digital Input #1
GND Ground (Digital)
DI2 Digital Input #2
GND Ground (Digital)
DO1 Digital Output
SDI SDI-12 data connection
+Vin 5-15Vdc External Power Supply
GND 0Vdc External Power Supply / Ground
Table 1- I/O Terminal Designations
4.2.1 Internal Lithium Battery
The iRIS has an internal AA size 3.6V, 2400mA/Hr lithium battery, which provides the power supply when no
external dc power supply is available. When external power is connected, the internal battery is completely
disconnected. The battery may be replaced by the user.
NOTE: 1) The internal battery is not intended for long-term use, rather as a back-up in the event of
loss of external power.
2) Standard AA batteries such as Alkiline, NiCad, NiMh, etc, cannot be used in the iRIS as
they are not of sufficient voltage to supply the iRIS.
4.2.2 External Power Supply
Although the iRIS is designed to operate solely from its internal battery for many months, you will typically
need to connect an external supply to the unit so that the internal battery remains in a charged state. Any
external dc power source ranging from 6 – 15 Vdc can be connected. A solar panel may also be connected
but will require a regulator to limit the voltage. A typical solar panel without regulation can generate voltage
up to 21V, which exceeds the iRIS 150 external dc input range.
The external power supply is protected against reverse connection or over-voltage by ultra-fast acting
protection devices and a self-resetting semiconductor fuse.