NOVUS TXRAIL0 - 10VDC - Manual (Page 2)

CONFIGURATION
If the transmitter is already configured as required by the application (sensor type,
range, etc), it may be installed and used right away. However, if a distinct
configuration is required, this can be done through the TxConfig software and the
TxConfig Interface.
The TxConfig interface and software can be purchased from the manufacturer or at its
authorized distributors and representatives. Updates for the software are available at
our website. To install the TxConfig software, run the Tx_setup.exe file and follow the
instructions.
Serial port configuration errors may occur when other devices are sharing the
same port (ex.: Palm Hot Synch). Close all serial port applications prior to
using the TxConfig software.
The TxConfig interface connects the transmitter to the PC, as shown in Figures 01
and 02. There are two types of interface: TxConfig-RS232 and TxConfig-USB.
Figure 01 – TxConfig Interface connections model RS232
Figure 02 – TxConfig Interface USB connections
The TxConfig interfaces contain dedicated circuitry for proper
communication between transmitters and computer. Always make use of
the TxConfig interfaces for configuration purposes, otherwise the
transmitters may get damaged, voiding the warranty.
Once the connection is accomplished, the software shows the configuration options
of the transmitter model attached. Access the Help for usage instructions.
The TxConfig screen in shown in Figure 03.
Figure 03 – TxConfig main screen
The fields in the screen mean:
1. Input Sensor: Choose the desired temperature sensor among the available
options. See Table 01.
2. Measuring Range: Defines the beginning and the end of the range.
Lower Range Value: Sets the value of the input signal (temperature or mV)
associated to the 0 V output.
Upper Range Value: Sets the value of the input signal thal Will correspond to
the 10 V output.
When the Lower Range Value is configured with a value higher than the Upper
Range Value, the voltage output will have a decrescent behavior (10-0 Vdc).
The values configured in these fields can not be beyond the sensor measuring
range. The minimum span value has to be observed as well. See Table 01.
3. Line Noise Rejection: The transmitter incorporates a digital filter to cancel the
induced noise from the 50 or 60 Hz systems. For better performance, select the
line frequency used in your country.
4. Sensor Failure Detection: Establishes the transmitter output behavior (Upscale or
Downscale) in the presence of a sensor fail.
5. Zero Correction: Allows for small sensor corrections. See item Operating.
6. Device Information: The Device Information box contains relevant data
concerning a particular transmitter. Please pass along this information when
contacting the technical assistance department.
7. Read Device: Brings to the screen the current transmitter parameters
configuration.
8. Apply: Sends a new configuration to the transmitter.
Note: The factory default configuration is (unless otherwise specified or ordered):
 Pt100 input, 0 to 100 ºC;
 60 Hz filtering and up scale (10 Vdc) output for sensor fail.
OPERATION
All input types and the 4-20 mA output current are factory calibrated and have no
need for user adjustment.
However, if desired by the user, a manual offset trim is implemented to provide fine
adjustments to the signal in the field. This is accomplished by the front keys ZERO+
and ZERO-, located under the frontal label in order to avoid accidental adjustments.
Using a small tool (2 mm diameter), press and hold the desired key for at least 2
seconds to increase or decrease the output current. When the output current is
reached, the key must be released.
The offset correction can also be accomplished by the TxConfig software. See in
Figure 03 the Zero Correction field for this purpose. The serial adaptor can be
connected to the transmitter while it is operating in the process.
The user must choose the sensor and configure the sensor span which best suit the
application. The sensor span must not exceed the maximum range supported by the
transmitter for a particular sensor, neither be lower than the minimum span.
It is important to note that the transmitter accuracy is related to the total sensor span
of a sensor, regardless of the output scale (span) configured. Example:
Pt100; maximum input span of –200 to +650 °C, 0.2 % accuracy.
Maximum error: 1.7 °C (0.2 % of 850 °C)
This error is the same no matter if total span is used (-200 to 650 °C) or a
narrower user-defined span is used, like 0 to 100 °C.
Note: When using a Pt100 simulator, make sure the transmitter Pt100 excitation
current (0.18 mA) is compatible with the simulator specification.
The transmitter must be powered in order to be configured. The TxConfig-USB
interface provides the necessary power. The TxConfig-RS232 interface, however,
requires an auxiliary supply to guarantee a reliable communication with the
computer. A recommended solution is to power the transmitter by an external power
supply (18-35 Vdc), as shown in Figure 01.