Novus TxRail-USB User manual

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Tx
Rail-USB
TEMPERATURE TRANSMIT
TER - OPERATING MANUAL – V1.0x H
INTRODUCTION
TxRail-USB is an USB configurable DIN rail mount temperature
transmitter. It allows selection and configuration of input type,
measurement range, output type and calibration. Its output can be
set to either loop powered 4-20 mA or 0-10 Vdc. Highly accurate and
user-friendly, the TxRail-USB performs well from simple to
sophisticated measurement applications.
The output current is linearized according to the selected input
sensor and adjusted to the configured range.
SPECIFICATIONS
Sensor input: User defined. The supported sensors are listed in
Table 1, along with their maximum ranges.
Thermocouples: Types J, K, R, S, T, N, E and B, according to
IEC 60584 (ITS-90). Impedance >> 1 MΩ
Pt100: Type 3-wire, Excitation 0.8 mA, α= 0.00385, according
IEC 60751 (ITS-90).
For 2-wire sensors, tie terminals 3 and 4 together.
Pt1000: Type 3-wire, Excitation 0.8 mA, α= 0.00385, according
IEC 60751 (ITS-90).
For 2-wire sensors, tie terminals 3 and 4 together.
NTC R25°C: 10 kΩ±1 %, B25/85 = 3435
Voltage: 0 to 50 mVdc. Impedance >> 1 MΩ
Sensor Type
Maximum Measurement
Range
Minimum Measurement
Range
Voltage
0 to 50 mV
5 mV
Thermocouple K
-150 to 1370 °C
100 °C
Thermocouple
J
-100 to 760 °C
100 °C
Thermocouple
R
-50 to 1760 °C
400 °C
Thermocouple
S
-50 to 1760 °C
400 °C
Thermocouple T
-160 to 400 °C
100 °C
Thermocouple N
-270 to 1300 °C
100 °C
Thermocouple E
-90 to 720 °C
100 °C
Thermocouple
B
500 to 1820 °C
400 °C
Pt100
-200 to 650 °C
40 °C
Pt1000
-200 to 650 °C
40 °C
NTC
-30 to 120°C
40 °C
Table 1 – Sensors accepted by the transmitter
Switch-on delay: < 2.5 s. The accuracy is only guaranteed after 15 min.
Terms of reference: ambient: 25 ° C; voltage: 24 Vdc, load: 250 Ω;
settling time: 10 minutes
Temperature Effect: < ±0.16 % / 25 °C
Response time: typical 1.6 s.
Maximum voltage allowed at input terminals no sensor: 3 V.
RTD current: 800 µA.
RTD cable resistance effect: 0.005 °C / Ω
Maximum allowable cable resistance for RTD: 25 Ω.
Sensor Type
Typical
Accuracy
Maximum
Accuracy
Pt100 / Pt1000
(-150 to 400°C)
0.10% 0.12%
Pt100 / Pt1000
(-200 to 650°C)
0.13% 0.19%
mV, K, J, T, E, N, R, S, B
0.1 % (*)
0.15 % (*)
NTC 0.3 °C 0.7 °C
Table 2 – Calibration error, percentage of the full measurement range.
(*) Add cold junction compensation: < ± 1 °C.
Power supply influence: 0.006 % / V typical (percentage of the full
measure range).
Output (4-20 mA):4-20 mA or 20-4 mA current, 2-wired; linearized
according to the selected sensor.
Output Resolution (4-20 mA):2 µA.
Output (0-10 Vdc): 0-10 Vdc or 10-0 Vdc voltage, linear with respect
to the measured temperature for the selected sensor.
Output Resolution (0-10 Vdc): 0.0025 V (12 bits)
Power supply: 10 to 35 Vdc (output 4-20 mA) and
12 to 35 Vdc (output 0-10 Vdc).
Maximum load (RL): RL (máx.) = (Vdc – 10) / 0.02 [Ω]
Where: Vdc= Power supply voltage (10-35 Vdc)
Operating Temperature: -40 to 85 °C
Humidity: 0 to 90 % RH
Electromagnetic Compatibility: EN 61326-1:2006
No electrical isolation between input and output.
Internal protection against polarity inversion.
Cold junction compensation for thermocouples.
Connection Wire Cross Section: 0.14 a 1.5 mm²
Screw Tightening: 0.8 Nm.
Housing: ABS UL94-HB.
Certification: CE
CONFIGURATION
Changes to the configuration are possible through the TxConfig II
software, provided free of charge.
ATxRail-USB Setup Kit consisting of the TxConfig II software and
USB cable can be purchased from the manufacturer or any authorized
distributor. The TxConfig II software is continuously updated and new
versions can be downloaded at no charge from the manufacturer’s
website. To install, execute the TxConfigIISetup.exe file and follow the
instructions.

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Fig. 1– USB cable connection
During the setup, the transmitter is powered by the USB, not
requiring an external power supply.
The transmitter setup can also be made by connecting it to the loop,
using the loop power supply. There is no electrical insulation between
the transmitter and the communication port (interface), therefore it is
not recommended to configure it with the sensor inlet connected to the
process. See Fig. 2.
Fig. 2 – USB cable connections – Loop powered
After these connections, the user must run the TxConfig II software
and, if necessary, consult the Help topic to help using the software.
The USB communication port (interface) of the
TxBlock-USB is not electrically insulated from the
transmitter’s input.
SOFTWARE CONFIGURATION:
Fig. 3 – TxConfig II software main screen
The fields in the screen mean:
1. General Information: This field shows information that identifying
the transmitter. This information should be sent to the
manufacturer in an eventual request for technical assistance.
2. Sensor: Select the type of sensor to be used. See Table 1.
3. Measuring Range: Sets de measurement range of the
transmitter.
Lower Range Limit: Equivalent temperature for a current of 4
mA.
Upper Range Limit: Equivalent temperature for a current of 20
mA.
Sensor Range
The values chosen cannot exceed the range of sensor shown in
this field. See Table 1 of this manual.
Minimum Range
Do not set a lower band (span) that the Minimum Range
indicated below in this same field. See Table 1 of this manual.
4. Sensor Failure: It establishes the output behavior, when the
transmitter indicates a failure:
Minimum: output current goes to < 3.8 mA (down-scale), typically
used for refrigeration.
Maximum: output current goes to > 20.5 mA (up-scale), typically
used for heating.
5. Zero Correction: It corrects small deviations presented in the
transmitter output, for example, when the sensor is replaced.
6. Send Configuration: It applies the new setup. Once sent, the
setup will be immediately adopted by the transmitter.
7. Read Configuration: Reads the current setup in the transmitter
connected. The screen now presents the current setup that may
be changed by the user.
FACTORY SETTING:
•Sensor: Pt100 3-wire, range 0 to 100 °C
•Sensor failure: upscale (maximum).
•0 °C zero correction.
•Unit: °C;
•Output: 4-20 mA.
MECHANICAL INSTALLATION
The TxRail-USB transmitter is suitable to be installed in heads.
Vibrations, moisture and extreme temperatures, electro-magnetic
interference, high voltage and other interferences can permanently
damage the unit, and could cause error in the measured value.
DIMENSIONS:
Fig. 4 – Transmitter dimensions

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OPENING THE TRANSMITTER:
In order to open the transmitter, you must press the orange lockers
located on both sides of the enclosure and pull the frontal cover very
carefully, just like shown in Fig. 05.
Fig. 5 – Opening the transmitter
ELECTRICAL INSTALLATION
•Polyamide enclosure.
•Section of the cable used: 0.14 to 1.5 mm ²
•Recommended torque in the terminal: 0.8 Nm.
RECOMMENDATIONS FOR INSTALLATION
•Conductors of small electrical signals must be distant from
activation and high-tension/current conductors, preferably passing
through grounded conduits.
•A specific electrical power supply network should be provided for
instruments use only.
•In controlling and monitoring applications, possible consequences
of any system failure must be considered in advance.
•RC filters (47R an 100nF, serial) in inductor charges (contactors,
solenoids, etc.) are recommended.
ELECTRICAL CONNECTIONS
The figures below show the electrical connections required. The
terminals 1, 2, 3 and 4 are dedicated to the sensor connection.
LOAD represents the 4-20 mA current measuring device (indicator,
controller, recorder, etc.).
PT100 2-WIRE / NTC
Note: When the Pt100 2-wire the terminals 1 and 3 must be
interconnected, according to the figure below.
The Pt100 wire length should be less than 30 cm to maintain the
measurement error within specifications (electrical resistance).
Fig. 6 – Transmitter electrical connections (Pt100 2-wire / NTC)
PT100 3-WIRE
Fig. 7– Transmitter electrical connections (Pt100 3-wire)
PT100 4-WIRE
Fig. 8– Transmitter electrical connections (Pt100 4-wire)
Pt100 3 and 4-wire: For appropriate cable resistance compensation
they should be equal for all legs. Maximum wire resistance is 25 Ωper
wire leg. Usage of a 3 or 4 wire with conductors of equal length and
gauge is recommended.
THERMOCOUPLES
Fig. 9– Transmitter electrical connections (Thermocouple)
VOLTAGE (0-50 mV)
Fig. 10 – Transmitter electrical connections (0-50 mV)

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OUTPUTS (0-10 V and 4-20 mA)
Fig. 11 – Transmitter electrical connections (0-10 V and 4-20 mA)
OPERATION
The sensor offset can be changed through the TxConfig II software.
The USB cable may be connected to the transmitter without causing
any measurement errors. See item Zero Correction in the chapter
CONFIGURATION of this manual.
The user must choose the most suitable sensor and range to the
process. The chosen range must not exceed the maximum range of
measurement defined for the sensor and should not be smaller than
the minimum range for the same sensor.
It is important to note that the transmitter accuracy is based on the
maximum range of the sensor used, even when a narrower range is
programmed. Example:
•The Pt100 sensor in the range 0 to 100 °C and accuracy of
0.12 %, the maximum error will be 1.02 °C (0.12 % de 850 °C);
•The Pt100 sensor in the range 500 to 600 °C and accuracy of 0.19
%, the maximum error will be 1.61 °C (0.19 % of the 850 °C).
Note: When measurements are made at the transmitter, see if the
Pt100 excitation current required by the calibrator is compatible with
the Pt100 excitation current used in the transmitter: 0.8 mA.
WARRANTY
Warranty conditions are available on our website
www.novusautomation.com/warranty.