NOVUS TxIso Rail- HART - Manual (Page 2)

INTRODUCTION
The temperature transmitters TxIsoPack-HART (head mount) and TxIsoRail-HART
(DIN rail mount) are programmable devices that can be configured to work in a
variety of industrial processes. The input sensor can be configured to accept RTDs,
thermocouples, resistance and mV. They convert the sensor signal into a 4-20 mA
output proportional the measured value.
These transmitters offer digital communication by means of the HART protocol,
through which the transmitter configuration and input monitoring can be accessed.
In this protocol, the digital communication is superimposed to the current loop.
The input and output in the TxIsoPack-HART and the TxIsoRail-HART are
electrically isolated, enhancing their performance and electromagnetic immunity.
CONFIGURATION
If the transmitter is already configured to the application, it can be installed
immediately. However, if a change in the configuration is required, this can be
accomplished with the TxConfig software and then sent to the transmitter via the
TxConfig-HART Interface connected to the PC USB port.
The TxConfig-HART Interface and software TxConfig consists of the Transmitter
Configuration Kit which can be ordered from the manufacturer of its authorized
representatives. The latest release of this software can be downloaded from our
web site. To installing, run the Tx_setup.exe file and follow the instructions.
The interface connects the transmitter to the computer, as shown in Figures 01 and
02:
Figure 01 – TxConfig-HART interface connection to the TxIsoPack-HART
Figure 02 - TxConfig-HART interface connection to the TxIsoRail-HART
After the connections are made, the user must run the TxConfig software and, if
necessary, use the Help topic to configure the transmitter.
The fields in this software have the following purposes:
1. Sensor: Sets the sensor to be used. See Table 01.
2. Measure: Sets the transmitter measurement range (minimum and maximum
values).
When the Lower Limit is set with a value higher than the Upper Limit value, the
output current operates between 20 and 4 mA
The values chosen cannot exceed the Sensor Range shown in this same field,
and also may not establish a range with width (span) smaller than the Minimum
Range indicated later in this same field. See Table 1 of this manual.
3. Filtering: Filters the measurements made by the transmitter eliminating
interferences from the electrical system that feeds the process.
4. Failure: Establishes the behavior of the output when problems are present by the
sensor. When Minimum is selected, the output current shifts to < 4 mA (down-
scale), typically used en refrigeration. When Maximum, is selected > 20 mA (up-
scale), typically used for heating.
5. Zero Correction: Corrects minor errors presented by the transmitter, for
example, when the sensor is changed. See item Operation in this manual.
6. Transmitter Information: In this field, there are data that identify the transmitter.
This information must be informed in any consultation with the manufacturer.
7. Send Configuration: When selected, this allows one to send the configuration to
the transmitter connected.
8. Read Configuration: When selected, this allows one to read the configuration on
the transmitter connected.
Note: If on the purchase order the user does not define a specific configuration, the
following configuration will be set:
Pt100 sensor, range 0 to 100 °C, 0 °C zero correction.
Filter to 2 A and maximum output for sensor failures.
OPERATION
The transmitter is perfectly factory calibrated with standardized sensors, not
requiring any adjustment by the user.
Fine corrections can be accomplished through the TxConfig software (in units of
temperature).
The user may choose the sensor and the span that best fits its application. The
sensor span must lie within the range specified for the selected sensor.
It is important to note that the accuracy of the transmitter refers to the maximum
range of the sensor used, regardless of the actual span. Example:
The sensor Pt100 has a max. range of –200 to 850 °C and total accuracy de
0.2 %.
Thus, we can have an absolute error up to 1.7 °C (0.2 % of 1050 °C).
This error is the same no matter if total span is used (-200 to 850 °C) or a
narrower user-defined span is used, like 0 to 100 °C
MECHANICAL INSTALLATION (TXISOPACK-HART)
The TxIsoPack-HART is designed for head mounting.
Figure 03 –TxIsoPack-HART dimensions
ELECTRICAL INSTALLATION (TXISOPACK-HART)
Refer to the Figure 04 below for the transmitter required connections (loop
excitation and sensor wiring: thermocouple, RTDs, resistance or mV).
Figure 04 – TxIsoPack-HART transmitter electrical connections