iRIS 350FX Reference Manual V1.50
61
HyQuest Solutions (NZ) Ltd
- PO Box 9466, Hamilton, New Zealand Tel: +64 7 857-0810 Email: [email protected]
Connecting a 0-5V Pressure Transducer
Connecting a standard sensor (such as a pressure transducer that provides a 0-5V signal) to an iRIS is relatively
straightforward. The sensor can be powered from the iRIS’s 12V supply and optionally controlled by a digital
output to save power.
However, the iRIS’s internal battery is NOT recommended for directly powering the sensor alone if the
charging source is a solar panel, as it is a relatively low capacity type. Connect a supplementary external 12V
battery (7A/Hr or larger) to increase the available storage.
The diagram below shows the typical connection diagram for such an installation. It assumes the use of AI1
as the desired input channel. It also shows the connection of the switched supply from DIO4.
TOP
iRIS I/O Connector
The sensor should be configured for the correct channel, scaling and logging regime as described in Section
for a description of how to accurately scale the sensor.
A typical sensor configuration example for this type of installation is
shown here. The instrument is a 10 metre, 0-5V output pressure
transducer. The level is averaged and the result logged every 15
minutes.
The iRIS supports activation of digital outputs with a schedule. See Section
example. Therefore, if further power reduction is to be achieved by controlling the transducer power,
follow this procedure:
1.
Connect the transducer supply to a digital I/O channel to be used as the switched 12V output (e.g.
DIO4)
2.
Configure the digital output’s mode to be Schedule (Mode = 1) and the Polarity to be Normal Pull-Up
(Polarity = 2).
3.
Set up the digital output’s schedule to match the sensor’s logging period, but with the digital output
being set to activate the desired amount of time before the sensor is to log and with sufficient “on”
time to ensure an overlap with the logging time.
4. Ensure the sensor mode is set to Instant (0) or 1 minute average (4).
AI4
AI3
AI2
AI1
AGND
AOUT
DIO4
DIO3
DIO2
DIO1
SDI-12
DGND
12V+
GND (-)
VIN+
GND (-)
+
Signal
Pressure Transducer
-
Charging source e.g. solar panel
12V Battery
(Required)
+
-
Name: Water Lvl
Source: 1. Analogue In 1
Process Mode: Period Average
Multiplier: 2.0000
Offset: 0.0000
Log Rate: 15 mins
Summary of Contents for iRIS 350FX
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