SMART UNIVERSAL TEMP. TRANSMITTER SERIES: SEM2150 pages
Smart Universal Temperature Transmitter
(]}[|INDUMART
Canada
www. indumart. com
SEM215
>- THERMOCOUPLE, RTD, mV & SLIDE-WIRE INPUTS
>► INPUT/OUTPUT GALVANIC ALLY ISOLATED
>► LOOP POWERED
> 4-20 mA OUTPUT
>► DIN RAIL MOUNTED N
>► PC CONFIGURABLE
>► FIELD RANGE SELECTABLE
>► COMPACT SIZE & FAST WIRING
>► FLAMMABLE ATMOSPHERE COMPATIBLE (OPTION)
INTRODUCTION
RAIL-MOUNTING
The SEM215 Series Rail-mounted Universal
Temperature Transmitters provide accurate and
reproducible conversion of any commonly used
thermocouple sensors, Pt-100 RTDs, slide-wire
transducer or mV signals to isolated industry
standard 4-20 mA output. The versatility of this
smart temperature transmitter results in lower
stock holdings and greater operational flexibility.
Isolation is a standard feature, removing all
ground loop effects as the input is electrically and
physically isolated from the loop powersupply.
The transmitter can easily be configured in the
field by setting the positions of eight switches
located close to the rail clip. Six switches are
available to provide 57 pre-set ranges, one switch
is for unit selection and the last switch will be used
to specify the burnout option. These switches are
inaccessible in normal use to prevent tampering.
Configuration can also be performed via a
personal computer. The sensor type, range, filter
factor, linearisation scheme, temperature offset
and the device tag are easily programmed using
a PC and a simple Windows© based software
program. This allows for reprogramming or
interrogation of the transmitter, while it is installed
in the loop. Sensors can be changed without the
need for recalibration. Special sensors can be
accommodated by using the type "X" element,
which allows any custom characterization and
linearisation option.
Sensor referencing enables the transmitter to be
accurately matched to a particular sensor. A user
programmable offset is available to remove any
system error or to shift the temperature reading in
either direction. Four selectable settings have
been provided to remove any incoming noise
from the sensor.
The transmitter is very compact enabling a high
packing density to be achieved and by using the
latest tension clamp technology for the two part
terminals, connections are made in half the time
taken to wire conventional screw terminals.
These terminations are maintenance-free and the
tension clamp ensures that the contact is
permanently under tension, eliminating any
potential problem of loosening due to
temperature fluctuations or vibration.
In normal operation the current output varies
between 4 and 20 mA. If the input sensor
develops a fault, or the software in either of the
two microprocessors detects an error, then the
current output is driven either upscale (greater
than 20 mA) or downscale (less than 4 mA)
depending upon the sense of the burnout
parameter selected. The use of two
microprocessors results in error-free data
transmission across the isolation barriers.
The transmitter is protected against reverse
connection, so that incorrect output wiring results
in near zero current flow in the loop.
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