21.0 mm
Designed, manufactured and supported by:
Every effort has been taken to ensure the accuracy of this specification, however we do
not accept responsibility f or 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
1.0 DESCRIPTION
The SEM203TC is an in-head (4 to 20) mA tran smitter t hat 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 f ull 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.
D2432-01-09 CN5171 SEM203TC User Guide
THERMOCOUPLE TX
SEM203/TC
PUSH BUTTON
Status Business Park, Gannaway Lane
Tewkesbury Glos. G20 8FD. UK
Tel: +44 (0)1684 296818 Fax: +44 (0)1684 293746
Email: support@status.co.uk
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
J
E
N
T
R
S
Range (mV)
mV
Isolation Tested to 250V dc
Sensor Burnout Either up or down scale output
Cold Junction Range (-40 to 85) °C; Accuracy ± 0.5 °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] KΩ
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
Factory Default (0 t o 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.
-200 to 1370 ± 0.1% of F.S. ± 0.5 °C
-100 to 1200
-100 to 1000 ± 0.1% of F.S. ± 0.5 °C
-180 to 1300
-100 to 400
-10 to 1760
-10 to 1760 ± 0.1% of F.S. ± 0.5 °C
-10 to 70 ± 0.02% of full scale
Tracking ± 0.05 °C / °C
control ANNEX A ; ANNEX F
(plus any sensor error)
± 0.1% of F.S. ± 0.5 °C
(plus any sensor error)
(plus any sensor error)
± 0.1% of F.S. ± 0.5 °C
(plus any sensor error)
± 0.2% of F.S. ± 0.5 °C
(plus any sensor error)
± 0.1% of F.S. ± 0.5 °C
(plus any sensor error) over range 800 to 1600
(plus any sensor error) over range 800 to 1600
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
LOAD
Ø43.0 mm
-
33.0 mm
Centres
-
T/C
R
M
U
+
+
5.0 USER RANGING
The transmitter may be purchased pre-configured, if specified at the time of order. User
ranging is provided to allow t he temperature range of the transmitter to be set to a custom
range. This configuration level cannot change the input type, If the input type or other
parameters require change, then please refer to the advances configuration section. To confirm
the present input type set on the transmitter is correct for your application, count the number of
flashes of the range “R” LED at power up then refer to the chart in section 6 “Menu 1” to
establish the type set.
The push button is located under the slot in the key hole label, the slot located next to the
menu “M” LED. To press the button use a 3 mm screw driver (flat blade), inserted into the slot
and locate resistance of button key. The button has a slight click action.
It may be worth noting at this stage the advance user configuration p rovides the user with the
option of selecting fixed ranges, this may be a more attractive option if a suitable range is
available, as no calibration equipment will be required.
Configuration will require the following tools and equipment :-
• DC Supply (12 to 30) V @ 30 mA
• Thermocouple calibrator
• Thermocouple compensating wire
• Screw driver flat blade 3mm wide
To re-range the temperature scale follow the following instructions:-
• Connect thermocouple calibrator to SEM203TC input terminals using correct
thermocouple compensation wire. Observe polarity.
• Connect the output terminals to the DC supply, observe polarity.
• Turn DC supply on.
• Set calibrator to the required low scale temperature. Note Range “R” LED if on
indicates input connection error or input out of range, please check input.
• Allow 1 minute warm up period.
• To “enter” ranging, press and keep pressed the push button until Range “R” LED
flashes at a slow rate, then release button
• .The “R” LED will f lash at a slow rate f or a approximately one second during which
period the low scale range is stored. Once the store is co mplete the “R” LED will flash
at a medium rate indicating the transmitter is ready to store the high range setting.
• Set the calibrator to the required high range temperature and allow ten seconds.
• Press button to store high range setting, the “R” LE D will flicker fo r one second before
the transmitter returns to normal operation. The transmitter is now re-ranged.
The above procedure also applies to mV input, but please ensure only copper wire is used for
connection to mV calibrator.
6.0 ADVANCED USER CONFIGURATION
The advanced user configuration option is based on five menus, each menu
Sets a different parameter:-
Menu 1 Selects one of eight input types.
Menu 2 Selects either custom user range or one of seven fixed range
Menu 3 Se lects the output direct on sensor burnout
Menu 4 Provide User trim at 4mA and 20 mA.
Menu 5 Reset to factory default setting
The advance configuration menus are navigated using the push button, menu “M” LED and
range “R” LED, The push button is located underneath the slot in the key hole label, located
just below the “M” LE D. To press the button use a 3 mm screw driver (flat blade) inserted into
the slot. The button has a slight click action.
Three commands a re used to navigate menus, performed by clicking the button as follows:-
• Advance Sing le button press or click
• Escape or change direction Double press or click within 0.5 seconds
• Enter Press and hold button > two seconds
When a menu is selected the “M” L ED will flash a burst of 1 to 5 flashes, the number of
flashes represents the menu number.
Note the range “R “ LED will only operate when a selected menu has been entered, then the
“R” LED uses a series of flashes or toggle flash rates to indicate the state or stage of the open
menu.
D2432-01-09 CN5171 SEM203TC User Guide
Navigating the menus (Read all of this section before attempting configuration)
To access the advanced user menus press and hold down button during SEM203TC power up.
The advance user menus will now be enab led and remain enabled until t ransmitter power is
removed. Note the “USER RANGING ” level will not be active at this stage, the push button will
now serve to navigate “advance user menus” as follows:-
• To “enter” menus press and hold button for > 2 seconds. The “M” LED will then starts
to flash, rate one flash per burst (indicating menu 1).
• To “advance” to the next menu u se single button press, the “M” LED will advance to
two flashes per burst, indicating menu 2 is selected. Repeated single presses will
advance menu, once menu 5 is rea ched, the next press will returns to menu 1, fo r a
repeat cycle around the menus.
• To “escape” f rom menus back to normal operation use a double click of the button or
remove transmitter power. Note menus have no timeout escape and therefore will
remain selected indefinitely.
• To “enter” a selected menus press and hold button for two seconds, at which stage the
“R” LED will start to flash between bursts of the “M” LED, indicating the state of the
opened menu.
MENUS (First Select the required menu and open as described above.)
Menu 1 Input type
• On Entry “M” LED single flash eve ry burst (menu 1), followed b y a burst of between 1
to 8 “R” LED flashes, flash count represents the input type as listed below. Timeout is
10 seconds so be sure to act quickly if the type needs changing.
“R “ LED flashes
1
2
3
4
5
6
7
• Single b utton press to “advance” to the next input type, when type 8 is reached the
• Once the desired type is selected, allow 10 seconds with no button action, the
Menu 2 Fixed ranges
• On “Entry” the “M” LED f lashes twice every burst (menu2), followed by a “R” LED
• Range 1 is allocated f or the u ser custom pu sh button set range. When a new custom
Range “R”
LED
flashes
1
2
3
4
5
6
7
8
• Single button press to “advance” to the next range, once range 8 is reached, the next
• Once the desired range is selected allow for 10 seconds with no button action, the
8
next “advance” will cycle back to type 1. To ensure valid indication of input menu,
allow one to two burst cycle after ”advance”, before counting the “R” LED flashes.
transmitter will the n store t he selected input type, (indicated by flicker of “R” LED)
before return back to normal operation.
flashes between 1 to 8 , flash coun t represents the range selected as described below.
Timeout is 10 seconds so be quick to act.
range (see USER RANGING) is entered, the range selected will automatically return to
1.
Inputs
K,J,E, & N
“advance” will cycle range back to 1. To ensure valid indication of range menu, allow
one to two burst cycle after ”advance”, before counting flashes.
transmitter will th en store new range (indicated by flicker of “R” LED) before returning
to normal operation.
(°C)
0 to 1000 0 to 400 800 to 1760 0 to 70
0 to 1200 0 to 250 800 to 1600 0 to 5
0 to 600 0 to 200 800 to 1400 0 to 10
0 to 500 0 to 150 1000 to 1760 0 to 20
0 to 250 0 to 100 1000 to 1600 0 to 25
0 to 100 0 to 50 1000 to 1400 0 to 50
-100 to 100 -100 to 150 0 to 1600 -10 to 10
Input Type
Type K
Type J
Type E
Type N
Type T
Type R
Type S
mV
Input
T
(°C)
User Ranged
Inputs
R, & S
(°C)
Input mV
mV
Menu 3 Burnout Selection
• On “Entry” - “M” LED, th ree flash every burst (menu 3), followed b y a “R” LED toggle
flash, either at a slow rate (every second) or a faster medium rate. Be quick to act as
timeout is 10 seconds.
• Slow rate indicated low scale burnout , fast rate indicates upscale burnout.
• To “advance ” to the the other burnout direction press button.
• To store new setting a llow 10 seconds with no button action, the burn out selsction
menu will then timeout, store new setting, (indicated by a flicker of the “R” LE D),
before returning back to normal operation.
Menu 4 User trim
This menu allows the user to trim the output current at zero and span, (similar function
to trim potentiometers) and is very useful for trimming out sensor errors.
The input of the transmitter must be connected to either a ca librator or a temperature
sensor held at a known temperature. The (4 to 20) mA loop current will also need to be
monitored with a current meter. This menu has extended timeout of 20 seconds.
• The trim action will only operate within certain output current bands, the zero will be
trimmed when the out current is between (3.8 to 6.0) mA, and the span will b e trimmed
when the output current is between (18.0 to 21.5) mA.
• On “Entry” - “M” LED, four fla sh every burst (menu 4), followed by a “R” LED toggle
flash, either at a slow rate (every second) or a faster medium rate.
• Slow rate indicates trim direct down, whilst fast rate indicate trim direction up.
• To “change direction” the trim direction double click button.
• To trim, single press button to “advance” current by 2 uA, or press and hold button to
auto advance, after two seconds the trim will adjust automatically at a rate of 3 uA per
second until the button is released. Note after approximately 2 0 seconds of continuous
button press, the auto trim rate will speed up to a rate of 10 uA per second.
• To store new setting allow 20 seconds with no button action, the User Trim menu will
then timeout and store any new setting(s), (indicated b y a flicker of the “R” LED),
before returning back to normal operation.
Menu 5 Set factory default
• On “Entry” - “M” LED, f ive flashes every burst (menu 5), followed by “R” LED toggle
flash at a slow rate (every second).
• To set factory default and zero any user trim, press button. Default setting will then be
loaded and stored into the transmitter, indicated by a flicker of the “R” LED. The
transmitter will then return to normal operation.
• To avoid any action, allow 10 seconds with no button action, Set factory default menu
will then timeout, without storing any default configuration. The transmitter will then
return to normal operation.
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