NOVUS TxBlock-USB Heat Mounted Temerature Transmitter User Manual
- June 6, 2024
- Novus
Table of Contents
TxBlock-USB Heat Mounted Temperature Transmitter
TxBlock-USB Transmitter
TEMPERATURE TRANSMITTER – OPERATING MANUAL – V1.0x K
INTRODUCTION
The TxBlock-USB is a 4-20 mA 2-wire temperature transmitter for the head
mount, powered by the current loop. The output current is linearized and
adjusted in function of the input sensor type and range configured.
Its configuration is accomplished by connecting the transmitter to a PC USB
port without the need of any dedicated interface. The configuration does not
require that the transmitter be powered.
MECHANICAL INSTALLATION
The TxBlock-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 errors in the measured value.
DIMENSIONS:
ELECTRICAL INSTALLATION
- Section of the cable used: 0.14 to 1.5 mm ².
- Recommended torque in the terminal: 0.8 Nm.
RECOMMENDATIONS FOR INSTALLATION
- Sensor signals conductors must go through the plant system separate from power leads (loop), if possible in grounded conduits.
- The instruments must be powered from the instrumentation power supply circuit.
- In control and monitoring, applications is essential to consider what can happen when any part of the system fails.
- It is recommended the use of suppressors in contact coils, solenoids, and any inductive load.
ELECTRICAL CONNECTIONS
The figures below show the electrical connections required. Terminals 3, 4, 5,
and 6 are dedicated to the sensor connection.
LOAD represents the 4-20 mA current measuring device (indicator, controller,
recorder, etc.).
PT100 2-WIRE
Note: When the Pt100 2-wire is selected, terminals 3 and 4 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).
PT100 3-WIRE
PT100 4-WIRE
Pt1000 3-wire / Pt100 3-wire and 4-wire: For appropriate cable resistance
compensation they should be equal for all legs. Maximum wire resistance is 25
Ω per wire leg. Usage of a 3 or 4 wire with conductors of equal length and
gauge is recommended.
NTC 2-WIRE
THERMOCOUPLES
VOLTAGE (0-50 mV)
CONFIGURATION
When the transmitter is used with the factory setting, no further action is
required and the transmitter is ready to be installed.
Changes to the configuration are possible through the TxConfig II software or
the TxConfig application, provided free of charge.
The transmitter configuration interface (USB cable) can be purchased from the
manufacturer or its authorized sales representatives.
The 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.
The setup application is only available for Android smartphones and also can
be downloaded for free in the Google Play Store. To configure the device
through the application, an On The Go (OTG) adapter is required. The procedure
for using this adapter will be explained throughout this manual.
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. 9.
After these connections, the user must run the TxConfig II software and, if necessary, consult the Help topic to help using the software. For more information on how to connect the TxBlock-USB to the smartphone itself and to configure the device, see chapter SMARTPHONE CONNECTIONS.
**** The USB communication port (interface) of the TxBlock-USB is not electrically insulated from the transmitter’s input.
SOFTWARE AND APPLICATION CONFIGURATION:
The fields in the screen mean:
-
General Information: This field shows information that identifies the transmitter. This information should be sent to the manufacturer in an eventual request for technical assistance.
-
Sensor: Select the type of sensor to be used. See Table 1.
-
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 sensors shown in this field. See Table 1 of this manual.
Minimum Range
Do not set a lower band (span) than the Minimum Range indicated below in this same field. See Table 1 of this manual. -
Sensor Failure: It establishes the output behavior when the transmitter indicates a failure:
Minimum: Output current goes to < 3.6 mA (down-scale), typically used for refrigeration.
Maximum: Output current goes to > 22.0 mA (up-scale), typically used for heating. -
Zero Correction: It corrects small deviations presented in the transmitter output, for example, when the sensor is replaced.
-
Send Configuration: It applies to the new setup. Once sent, the setup will be immediately adopted by the transmitter.
-
Read Configuration: It 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.
Upon purchase order, the user can define a specific setup.
SMARTPHONE CONNECTIONS
With the help of a specific cable, which allows smartphones to recognize and configure TxBlock-USB when running the TxConfig application, Android smartphones with On the Go (OTG) technology can be directly connected to the device via the Micro-USB. To do this, it is necessary to observe the connection mode of the cable On the Go in the device, as can be seen in Fig. 12:
**** If you position the cable end incorrectly, it is possible that the device will not be recognized by the application.
CONFIGURING TXBLOCK-USB WITH TXCONFIG APPLICATION FOR ANDROID:
Once the connection between the smartphone and the TxBlockUSB is made, the
device will send the following message:
For the correct operation of the application, the option “Open TxConfig when
this USB device is connected?” must be checked, and then click the OK button.
After that, it will automatically run the TxConfig application, which has
already been previously installed on the smartphone, and will display the
following message:
The application will automatically switch to the configuration screen (see Fig. 11), where it will be possible to configure the TxBlock-USB.
OPERATION
The sensor offset can be changed through the TxConfig II software or the
TxConfig app.
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 uer 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.
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 to IEC
60751 (ITS-90).
For 2-wire sensors, tie terminals 3 and 4 together.
Pt1000: Type 3-wire, Excitation 0.65 mA, α = 0.00385, according to 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 MeasurementRange| 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
minutes.
Terms of reference: Ambient: 25 ° C; voltage: 24 Vdc, load: 250 Ω;
settling time: 15 minutes.
Temperature Effect: < ±0.16 % / 25 °C
Response time: T ypical 1.6 s
Maximum voltage allowed at sensor input terminals: 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 | Minimum 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 or 20-4 mA current, 2-wired; linear in relation to the
temperature measurement by the selected sensor.
Output Resolution: 2 µA
Power supply: 10 to 35 Vdc, across the transmitter
Maximum load (RL): RL (max.) = (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.
Dimensions: 43.5 mm (diameter) x 20.5 mm (height)
Connection Wire Cross Section: 0.14 a 1.5 mm²
Screw Tightening: 0.8 Nm
Housing: ABS UL94-HB
WARRANTY
Warranty conditions are available on our website
www.novusautomation.com/warranty.
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