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.