Device Description - WAGO -I/O-SYSTEM 750 750-481/003-000 Manual

WAGO-I/O-SYSTEM 750
750-481/003-000 2AI RTD Ex i
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Device Description

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The Analog Input Module 750-481/003-000 (2AI RTD Ex i) processes signals
from resistance sensors that are operating in hazardous environments of Zones 0
and 1. It allows the connection of Pt and Ni resistance sensors potentiometers
Depending on the operating mode, the resistance value is converted to a
temperature or directly sent out by the module. A microprocessor within the
module is used for converting and linearizing the measured resistance value into a
numeric value proportional to the temperature of the selected resistance sensor.
The operating mode can be set by using the WAGO-I/O-CHECK 2 start-up and
diagnostic tool (Item No.: 759-302). The default setting is Pt 100.
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Installation only in zone 2 or in non-hazardous environments!
The installation of the WAGO-I/O-SYSTEM 750 fieldbus couplers/ controllers
and I/O modules is only to be done in zone 2 or in non-hazardous environments.
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To fulfill Ex i regulations, only passive transducers, that means without their own
voltage supply, like adjustable resistances, pressure, flow and level meters, may
be connected to the input module.
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The transducers are directly supplied with 24V from the I/O module.
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The module has two input channels allowing the direct connection of two 2- or 3-
wire resistance sensors.
For example, two 3-wire sensors can be connected either to +R1, RL1 and -R1 or
to +R2, RL2 and -R2.
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The assignment of the connections is described in the "Connections" section.
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Connection examples are in the "Connecting devices - connection examples"
section.
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Each input channel of a module has a shield (screen) connection (S).
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The shield connection is fed directly to the carrier rail and contact is made
automatically by snapping the module onto the rail.
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The "ready" state of the respective channel and the internal data communication is
indicated by a green function LED.
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A red fault LED per channel indicates a wire break, a short circuit or that the
signal is outside the measuring range.
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The meaning of the LEDs are described in the chapter „Display Elements".
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Manual
1.1.0
Device Description 13