D2432-01-09 CN5171 SEM203TC User Guide
1.0
DESCRIPTION
The SEM203TC is an in-head (4 to 20) mA transmitter that connects to a standard
thermocouple sensor and converts the sensors temperature to a linear temperature (4 to 20)
mA signal.
The transmitter sensor type and range can be requested at the time of order, but if desired the
user can re-configure the transmitter parameters by use of a single push button and the range
“R” , menu “M” LEDS. Two methods of configuration are available, the first “
USER RANGING
”
acts only on the transmitter range, similar to the previous SEM203TC design. The other
method “
ADVANCED USER CONFIGURATION
“ offers full configuration, This level is entered
by holding down the push button on power up. The advanced level has the following menus:-
•
Menu 1 - Selection of input type , seven popular thermocouples or mV input.
•
Menu 2 - Select either user push button set range or one of seven fixed ranges.
•
Menu 3 - Select either up or down scale output on sensor burnout.
•
Menu 4 - User trim allow trim of output current at high and low range
•
Menu 5 - Reset factory default.
The addition of fixed ranges to this product allows the used to re-range the product without the
need for specialist equipment. The SEM203TC input is isolated.
2.0
RECEIVING AND UNPACKING
Please inspect the packaging and instrument thoroughly for any signs of transit damage. If the
instrument has been damaged, please notify your supplier immediately.
3.0
SPECIFICATION @ 20 °C
INPUT
Sensor
Range (
°
C)
Accuracy
K
-200 to 1370
± 0.1% of F.S. ± 0.5 °C
(plus any sensor error)
J
-100 to 1200
± 0.1% of F.S. ± 0.5 °C
(plus any sensor error)
E
-100 to 1000
± 0.1% of F.S. ± 0.5 °C
(plus any sensor error)
N
-180 to 1300
± 0.1% of F.S. ± 0.5 °C
(plus any sensor error)
T
-100 to 400
± 0.2% of F.S. ± 0.5 °C
(plus any sensor error)
R
-10 to 1760
± 0.1% of F.S. ± 0.5 °C
(plus any sensor error) over range 800 to 1600
S
-10 to 1760
± 0.1% of F.S. ± 0.5 °C
(plus any sensor error) over range 800 to 1600
Range (mV)
mV
-10 to 70
± 0.02% of full scale
Isolation
Tested to 250V dc
Sensor Burnout
Either up or down scale output
Cold Junction
Range (-40 to 85) °C; Accuracy ± 0.5 °C
Tracking ± 0.05 °C / °C
Stability
Offset 0.15 °C / °C ; Span 0.1 °C / °C
OUTPUT
Type
Two wire (4 to 20) mA sink
Limits
Low 3.8 mA ; high 21.5 mA
Accuracy
(mA out / 2000) or 5 uA which ever greater
Loop Effect
± 0.2 uA / V measured @ 50 Hz 1V (peak to peak
)
Thermal Drift
± 2 uA
Max Load
[(Vsupply – 12)/20] K
Ω
GENERAL
Operating Voltage
(12 to 30) Volts DC
Update Time
0.5 Seconds
Response Time
1 Second to reach 90% of final value
Start up time
From power up typically 5 Seconds
Filter Factor
Adaptive
Ambient Temperature
(-40 to 85) °C
Connection
Screw Terminal
Approvals
BS EN 61326 ; – Electrical equipment for measurement and
control ANNEX A ; ANNEX F
Factory Default
(0 to 1000) °C type K, upscale burnout (0.0 °C user trim)
4.0
INSTALLATION AND WIRING
4.1 Mechanical
The SEM203TC transmitter has been specifically designed to fit inside a DIN standard probe
head enclosure (such as the Status SCH-4 series), which provides adequate protection from
moisture, dust, corrosive atmosphere etc. All cable entries must be sealed using the correct
size gland. Likewise any probe assembly fitted must be sealed.
Care must be taken when locating the transmitter to ensure the working ambient temperature
range of (-40 to 85) °C is not exceeded. The SEM203TC enclosure has a centre hole allowing
the sensor wired to enter screw terminals from the transmitter centre, this is applicable when
the sensor is mounted directly below the transmitter.
Figure 1
Mounting holes : two holes 5.5 mm diameter, 33 mm centres
Centre Hole sensor wire entry : 4mm
4.2 Electrical
Electrical connections to the transmitter are made to the screw terminal provided on the top
face. The correct type of thermocouple wire must be used to connect sensor, this will normally
be provided as part of the probe assembly. The screw terminals allow for wires to enter either
inner or outer direction. Never attempt to unscrew the spare terminal which secures the factory
fitted cold junction sensor. The terminal is fitted with a tamperproof screw to avoid accidental
adjustment.
The transmitter is protected against reverse connection and over voltage. If no sensor (input)
connection is made the transmitter will go into either up or down scale output current,
depending on configuration setting.
Figure 2 gives connection details, the output is shown connected to a 24 V supply. The load
symbol represent any other device connected in the loop, such as Monitoring equipment ,
panel indicators and loop isolators. The load value can range from 0 ohms to the max loop load
for given supply, refer to section 3 “Max load” for more information.
The transmitter conforms with EC directive BS EN 61326 : when correctly installed in a
termination head providing at least IP20 protection and with sensor wires less than 3 metres.
Screened or twisted pair wires are recommended for output wires. Always ensure the (4 to 20 )
mA loop is grounded at one point, this would normally be at the monitoring equipment or loop
power supply.
In normal operation the range “R” LED acts as over-range LED. The menu LED is always off.
Figure 2
SEM203/TC
PUSH BUTTON
THERMOCOUPLE TX
Designed, manufactured and supported by:
Status Business Park, Gannaway Lane
Tewkesbury Glos. G20 8FD. UK
Tel: +44 (0)1684 296818 Fax: +44 (0)1684 293746
Email:
Every effort has been taken to ensure the accuracy of this specification, however we do
not accept responsibility for damage, injury, loss or expense resulting from errors and
omissions, and we reserve the right of amendment without notice
STOCK CODE
52-315-2432-01
Ø43.0 mm
21.0 mm
33.0 mm
Centres
U
-
+
-
+
R
M
T/C
LOAD
