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Installation
2.4.2 External Power Supply
The iRIS 150FX is designed to operate with an external supply so that the internal backup battery is disconnected. Any
external DC power source ranging from 6 – 15 V DC can be used. A solar panel may also be connected but will require a
regulator and external battery to limit the supply voltage to the iRIS. A typical solar panel without regulation can generate
up to 21 V, which exceeds the iRIS 150FX 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.
2.4.3 Analogue Inputs
Analogue inputs are uni-polar 0 - 5 V DC with 12 bit resolution. They present a load impedance of approximately 100 kΩ.
Suitable scaling factors should be chosen to convert from a raw value of 0 - 5000, which reflects the input signal range of
0 - 5 V (0 - 5000 mV). When current sources are used, an internal sink resistor (250 Ω) is connected between the analogue
input and AGND. The diagram below shows the position of the two analogue links. Fit the link to set the analogue input to
current mode, or remove the link to set it to voltage input mode (default).
Hint: If removing a jumper, simply fit it to one pin only of the connector to avoid it being lost.
Figure 1 – Analogue Selection Jumpers
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