Omega Products TX12 Installation Manual

TX12

PUSH BUTTON
PT100 TX

INSTRUCTION

SHEET

1.0 DESCRIPTION

The TX12 head mounted temperature transmitter connects to any standard pt100
resistance sensor and converts the linearised temperature to a (4 to 20) mA signal. The
transmitter is a two wire device, and is fully configurable by the user, over a wide
temperature range, with the aid of a simple push button. This new TX12 design
incorporates additional configuration menus, allowing the user to push button trim the
transmitter output at both zero and span, ideal for trimming out sensor errors. The
transmitters advanced circuitry guaranties high stability over the wide operating ambient
temperature ranges experienced by head mounted devices.

One of the transmitters features is the program LED, which provides visual indication of
sensor fault when in normal operation and is also used to guide the operator through the
simple menus during configuration.

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 Type PT100 100 R @ 0°C 2 or 3 Wire
Sensor Range (-200 to +850) ° C (18 to 390) _
Sensor Connection Screw terminal
Minimum span (see note 1) 25 °C
Linearisation BS EN 60751(IEC 751) standard / JISC1604
Accuracy (see note 2) ±0.1 ° C±0.05% of Reading
Thermal Drift 0.0025 % / °C
Excitation current < 200 uA
Lead Resistance effect 0.002 ° C/ _
Maximum lead Resistance 20 _ per leg

Note 1 Any span may be selected, full accuracy is only guaranteed

Note 2 Basic measurement accuracy includes the effects of

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 1 V (peak to peak)
Thermal Drift ± 1 uA / °C typical ; ±1.5 uA Max
Max Load [ (Vsupply – 10)/20 ] K_

GENERAL
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 ; 1998 – Electrical equipment for measurement

Factory Default (0 to 100) °C upscale burnout (0.0 °C user trim)

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M4561/0807

for spans greater than the minimum recommended span.

calibration, linearisation and repeatability

and control ANNEX A ; ANNEX F

MADE IN UNITED KINGDOM

4.0 INSTALLATION AND WIRING

SIDE VIEW BASE VIEW

Ø 43.0 mm

33.0 mm

CENTRES

21.0 mm

Mounting holes : two holes 5.5 mm diameter, 33 mm centres
Centre Hole sensor wire entry : 4 mm

4.1 Mechanical

The TX12 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 TX12 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.

4.2 Electrical

Electrical connections to the transmitter are made to the screw terminal provided on the
top face. The sensor wires must be equal length and type for the lead compensation to
work correctly. The screw terminals allow for wires to enter either inner or outer direction.
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.
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 : 1998 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 program LED acts as over-range LED.

Figure 1

Figure 2

5.0 USER CONFIGURATION

READ COMPLETE SECTION BEFORE ATTEMPTING CONFIGURATION
PARTICULAR CARE SHOULD BE TAKEN REGARDING TIMEOUTS IN MENU 2 & 3

User Configuration

User configuration uses three menus, each menu sets a different parameter:-

Menu 1 Set range
Menu 2 Set direction of output on sensor burnout
Menu 3 User trim at 4 mA and 20 mA.

The configuration menus are navigated using the push button and program LED, The
push button is located under the hole in the keyhole shaped wiring label. To press the
button use a 3 mm screw driver (flat blade) inserted into the hole. The button has a slight
click action.

Three types of button press are used:-

• Single button press = Advance

• Double press within 0.5 seconds = Escape or change direction

• Press and hold button > two seconds = Enter

•

When a menu is selected the Program LED will flash in bursts of one to three flashes, the
number of flashes represents the menu number.

Navigating the menus

• To access menus, press and hold button > 2 second, then program LED will start
to flash, one flash every burst. This Indicates “menu 1” is selected.

• Use single button press to advance selection to “menu 2”, the program LED will
now show two flashes per burst. The Next single presses will advance the
selected menu to menu 3 and the next single press will advance selected menu
back to menu 1. Repeated single presses will cycle the selected menu back
around menus 1 to 3, in the above sequence.

• Double press button to escape from menus, and return to normal. Normal
operation can also be selected by turning transmitter power off and on. Note the
transmitter will not time out and automatically escape from menus.

Menu 1 Range configuration (No Timeout)

Configuration will require the following tools and equipment :-

• DC Supply (12 to 30) V @ 30 mA

• Precision resistance decade box to simulate PT100 sensor.

• Screw driver flat blade 3mm wide

• PT100 resistance tables

• Current meter (user trim)

IMPORTANT

Figure 3 Configuration circuit

5.0 USER CONFIGURATION
IMPORTANT

READ COMPLETE SECTION BEFORE ATTEMPTING CONFIGURATION
PARTICULAR CARE SHOULD BE TAKEN REGARDING TIMEOUTS IN MENU 2 & 3

Figure 3 Configuration circuit

User Configuration

User configuration uses three menus, each menu sets a different parameter:-

Menu 1 Set range
Menu 2 Set direction of output on sensor burnout
Menu 3 User trim at 4 mA and 20 mA.

The configuration menus are navigated using the push button and program LED, The
push button is located under the hole in the keyhole shaped wiring label. To press the
button use a 3 mm screw driver (flat blade) inserted into the hole. The button has a slight
click action.

Three types of button press are used:-

• Single button press = Advance

• Double press within 0.5 seconds = Escape or change direction

• Press and hold button > two seconds = Enter

When a menu is selected the Program LED will flash in bursts of one to three flashes, the
number of flashes represents the menu number.

Navigating the menus

• To access menus, press and hold button > 2 second, then program LED will start

to flash, one flash every burst. This Indicates “menu 1” is selected.

• Use single button press to advance selection to “menu 2”, the program LED will

now show two flashes per burst. The Next single presses will advance the
selected menu to menu 3 and the next single press will advance selected menu
back to menu 1. Repeated single presses will cycle the selected menu back
around menus 1 to 3, in the above sequence.

• Double press button to escape from menus, and return to normal. Normal

operation can also be selected by turning transmitter power off and on. Note the
transmitter will not time out and automatically escape from menus.

Using Menus

Menu 1 Range configuration (No Timeout)

Configuration will require the following tools and equipment :-

• DC Supply (12 to 30) V @ 30 mA

• Precision resistance decade box to simulate PT100 sensor.

• Screw driver flat blade 3mm wide

• PT100 resistance tables

• Current meter (user trim)

To re-range the temperature scale follow the following instructions:-

• Refer to figure 3, connect resistance box to TX12 input terminals using three wire

connection. Connect output to a DC supply, observe polarity. Turn power on and
allow 1 minute warm up period.

• Set calibrator to the equivalent resistance of the PT100 sensor, at required low

range temperature. If the program LED is on at this stage the input is out of range,
check resistance and connection.

• Press and hold button > 2 seconds to enter menus, menu 1 will then be selected,

indicated by one flash every burst.

• Whilst menu 1 is selected, press and hold button > 2 seconds to enter menu 1, at

which stage the program LED toggle on and off at a slow rate.

• Allow ten seconds then single press button to store low range setting, the program

LED will now flash at a fast rate.

• Set calibrator to the equivalent resistance of the pt100 sensor, at required high

range temperature and allow ten seconds.

• Press button to store high range setting, the program LED will flicker for one

second before the transmitter returns to normal operation. The transmitter is now
re-ranged.

Menu 2 Burnout Selection (Timeout is 3 Seconds)

• Refer to figure 3, Connect output to a DC supply, observe polarity. For this menu
the input can be connected or open circuit. Turn power on.

• Press and hold button > 2 seconds to enter menus, menu 1 will then be selected,
indicated by one flash every burst.

• Single press button to advance selection to menu 2, indicated by two flashes of
the program LED every burst.

• Whilst menu 2 is selected, press and hold button > 2 seconds to enter menu 2, at
which stage the program LED will either toggle on and off at a slow indicating low
scale burnout or fast rate indicating upscale burnout.

• To change burnout direction single press button. The Program LED toggle rate will
change to the other setting. Repeated single presses will toggle between up and
down scale.

• To store setting allow 3 seconds with no button action, the program will then
timeout, store new setting then return to normal operation.

Menu 3 User trim (Timeout is 20 Seconds)

This menu allows the user to trim the output current at 4 mA and 20 mA points,
(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 calibrator or
temperature sensor held at a known temperature. The (4 to 20) mA loop current
also need to be monitored with a current meter.

• Refer to figure 3, connect sensor or resistance box to TX12 input terminals using
three wire connection. Connect output to a DC supply, observe polarity, connect
current meter in series with loop.Turn power on and allow 1 minute warm

period.

• Set calibrator to the equivalent resistance of the PT100 sensor, at required
point. Alternatively ensure sensor temperature is at the required calibration point.

• The transmitter will automatically trim the 4 mA end if the output is within the active
band of (3.8 to 6) mA, and trim the 20 mA end if the output is within the active
band of (18 to 21.5) mA. No setting adjustment is performed if the output current
not within these two bands. Ensure your calibration points are within these bands.

• Press and hold button > 2 seconds to enter menus, menu 1 will then be selected,
indicated by one flash every burst.

• Single press button to advance selection to menu 2, and single press again
select menu 3 indicated by three flashes of the program LED every burst.

• Whilst menu 3 is selected, press and hold button > 2 seconds to enter menu 3,
which stage the program LED toggle on and off at either a slow rate indicating
downward trim direction or fast rate indicating upwards trim direction.

• To change trim direction double press button. The Program LED toggle rate
toggle to the opposite direction. Repeated double presses will toggle between
and down trim direction

• To trim output current, single press button to advance current 2 uA in set direction,
or press and hold button to auto advance in set direction release button to stop
advance. Note after approximately 20 seconds of continuous button press,
auto trim rate will speed up. Monitor the current change on the current meter.

• To store new setting allow 20 seconds with no button action, the program will then
timeout, store new setting then return to normal operation.

Reset to factory default settings

If required the SEM203P can be reset to factory default setting, this procedure also
removes any user trim adjustment. Factory default settings are :

Range (0 to 100) °C
Burnout up-scale
User trim All user adjustment cleared

To reset to factory setting, hold the button down whilst the TX12 is powered up.

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RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT
(IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be
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The purchaser is responsible for shipping charges, freight, insurance and proper packaging to
prevent breakage in transit.

FOR WARRANTY

RETURNS, please have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which

the product was PURCHASED,

2. Model and serial number of the product

under warranty, and

3. Repair instructions and/or specific

problems relative to the product.

FOR NON-WARRANTY REPAIRS,

consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:

1. Purchase Order number to cover the

COST of the repair,

2. Model and serial number of the

product, and

3. Repair instructions and/or specific problems

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WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and
workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds
an additional one (1) month grace period to the normal one (1) year product warranty to
cover handling and shipping time. This ensures that OMEGA’s customers receive maximum
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If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone
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resulting from any action of the purchaser, including but not limited to mishandling,
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The information contained in this document is believed to be correct, but OMEGA accepts no
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WARNING: These products are not designed for use in, and should not be used for, human
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