NOVUS TxBlock-USB Transmitter - Manual (Page 2)

TxBlock-USB
NOVUS AUTOMATION 2/4
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.
Note: The factory default configuration is:
• Sensor: Pt100, range 0 to 100 °C, 0 °C zero correction.
• Sensor failure: upscale (maximum).
Upon purchase order, the user can define a specific setup.
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 error in the measured value.
DIMENSIONS:
Fig. 4 – Transmitter dimensions
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
• 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.