Description
The Q520 is a DIN rail mount,
thermocouple input, dual channel,
two-wire transmitter. Each channel
accepts a thermocouple input
and provides an isolated, 4-20mA
output signal, linear to the
millivolt input. Cold junction
compensation is provided and
each channel is fully isolated
(1800VDC) from input to output
and channel to channel.
All
ActionI/Q modules feature SnapLoc
plug-in screw terminals for
easy installation and low Mean-Time-To-Repair
(MTTR). Two or more modules
can slide together and interlock
for solid, high density mounting
(by removing either the foot,
or the adjacent unit's faceplate,
for right-hand side or left-hand
side mounting, respectively).
The module to be attached will
easily slide on to the side
of the mounted unit.
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Application
Thermocouple input, two-wire
transmitters are used to convert
a specific temperature range
into a regulated 4-20mA signal.
Two-wire transmitters are primarily
used in remote locations near
the sensor since they reduce
the probability of signal errors
and save wiring costs by utilizing
the two power wires to send
the 4-20mA signal. The current
signal is usually monitored
by a control system or data
recorder.
Typically,
thermocouples are used to measure
high temperatures such as in
an oven or furnace. Thermocouple
wires can be run a short distance
to a panel, or farther with
the use of shielded wire, without
errors caused by noise or lead
resistance in the wires. These
sensor wires are usually terminated
at the two-wire transmitter
and converted into a 4-20mA
signal which is highly immune
to noise and not affected by
lead resistance, both of which
can cause significant errors
in voltage signals transmitted
over long distances.
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