ERT-A2 ALERT2 Configuration Manual
Revision 1.0
14
Rain (Digital)
The Rain input connector on the ERT-A2 is for
connecting a Tipping Bucket Rain Gauge (TBRG),
which should be connected across Digital input #3 and
GND.
River Digital (Quadrature or Incremental)
Shaft encoders connector allows for
connection of a shaft encoder.
The ERT-A2 provide support for
either Incremental or Quadrature
type encoders which is selectable in
software configuration.
River (Analog)
The analog connector has support for two 4-
20mA Analog inputs. The external Milspec
connector connected to input AI1 (if fitted).
Input AI2 is only available through the terminals.
The 4-20mA signal is usually generated from
either a transducer mounted directly into the
river or from a bubbler system which uses a
constant flow of gas through a pipe to the water
level.
The analog inputs can be wired to support loop
powered or 4 wire 4-20mA sensors as shown.
Solar (Ext Supply)
The Solar/Supply connector allows for the
connection of a 5-30W solar panel or an external
24W power supply to power or charge the internal
or external Lithium battery as well as connections
for the battery and Heater control.
Warning: Do not connect an Externa
l Battery to the “BAT” terminal when an internal lithium battery
(either rechargeable or non-rechargeable) is fitted. Batteries at different charge levels could result
in excessive current and possible damage to the batteries or to the device electronics.
Содержание ERRTS ALERT2
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