D I N R A I L S M A RT U N I V E R S A L T E M P E R AT U R E T R A N S M I T T E R
SEM215
The SEM215 is a universal DIN rail mounted temperature transmitter that accepts most commonly used temperature sensors,
slide wire transducers or millivolt signals, isolates and transmits them as a (4 to 20) mA signal to a host system. It can be
configured by either of the following methods:
Configuration using “Quick Selector”
One of 59 pre-set ranges can be selected by using switches. The switch, located close to the rail clip, is inaccessible in
normal use. This “Quick Selector” method does not require any additional calibration, and the transmitter can be put into
service immediately after selection is made.
Configuration via PC
The sensor type and range are easily programmed using a PC and a simple Windows based software programme. This allows
for re-programming or interrogation of the SEM215 while it is installed in the loop. Sensors can be changed without the need
for re-calibration. Special sensors can be accommodated by using the type “X” option, the characterisation for these sensors
are factory entered for later retrieval from the menus.
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.
INPUTS
Pt100 Platinum resistance sensors, Thermocouples, millivolts or
Slidewire sensors may be connected to the unit, plus a ‘type X’
linearisation option which may be pre-configured at the factory to
satisfy any custom characterisation requirements.
The Process Variable may be filtered to remove incoming signal
noise using one of four settings. If the ‘Adaptive’ function is
selected the filter continuously adjusts to the incoming signal to
noise ratio in order to choose an appropriate level of filtering. In
this way a slowly changing input can be heavily filtered but if the
signal goes through a sudden change the filter quickly reduces
allowing a rapid response, other settings are; off, 2 seconds, 10
seconds.
A user programmable offset is available to remove any system
errors that may be present and sensor referencing enables the
transmitter to be accurately matched to a particular sensor.
I N T R O D U C T I O N
I N T R O D U C T I O N
UNIVERSAL INPUT
QUICK SELECTOR / PC CONFIGURABLE
GALVANICALLY ISOLATED
LOOP POWERED
COMPACT DIN RAIL MOUNTED
10 YEAR WARRANTY
CURRENT OUTPUTS
In normal operation the current output varies between 4 and 20
mA. If the input sensor develops a fault, or the software in either
o f t h e t w o m i c r o p r o c e s s o r s d e t e c t s a n e r r o r, t h e n t h e
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.
BLOCK DIAGRAM SEM215 schematic
A
D
C
ADC
µP
1/on
0
Range Selection
1
2
ADC PSU
Main
µP
3
4
5
6
7
Comms
8
DAC
Burnout 0 = high
Units 0 = °C
Loop
V+
V-