NOVUS TxIsoRail 4-20 mA User Manual

TxIsoRail 4

-20 mA

MICROPROCESSOR
O

BASED TEMPERATURE TRANSMITTER –

PERATION MANUAL V1.0x C

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 to IEC 60584 (ITS-90).

Impedance >> 1 M

Pt100: Excitation: 180 µA, 2 or 3-wire connection (for 2-wire

α= 0.00385, according to IEC 60751 (ITS-90).

Voltage: 0 to 50 mVdc, 0 to 10 Vdc. Impedance >> 1 M

0 to 20 mA, 4 to 20 mA. Impedance 15.0

Sensor Type Range Minimum measurement span
Thermocouple K -150 to 1370 °C / -238 to 2498 ºF 100 °C
Thermocouple J -100 to 760 °C / -148 to 1400 ºF 100 °C
Thermocouple R -50 to 1760 °C / -58 to 3200 ºF 400 °C
Thermocouple S -50 to 1760 °C / -58 to 3200 ºF 400 °C
Thermocouple T -160 to 400 °C / -256 to 752 ºF 100 °C
Thermocouple N -270 to 1300 °C / -454 to 2372 ºF 100 °C
Thermocouple E -90 to 720 °C / -130 to 1328 ºF 100 °C
Thermocouple B 500 to 1820 °C / 932 to 3308 °F 400 °C

Pt100 -200 to 600 °C / -328 to 1112 ºF 40 °C

Voltage

Current

Output: 2-wire 4-20 mA, linear with respect to the m easured sig nal.
Resolution: 0.001 mA (14 bi ts)
Total Accuracy: Better than 0.3 % of the maximum span for

Response Time: < 500 ms
Isolation: Between the sensor and the 4-20 mA loop (10 00 V / 1 min).
Power Supply: 12 to 35 Vdc, acros s the transmitter;
Maximum Load (RL): RL (max.)= (Vdc – 12) / 0.02 [Ω]

Operating Temperature: -40 to 85 °C
Humidity: 0 to 90 % UR
Electromagnetic Compatibility: EN 50081-2, EN 50082-2
Internal protection against polarity inversio n.
Cold junction compensat ion for thermocouples.

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Ω

sensors, ti e, terminals 2 and 3 together).

Note: 0-10 Vdc input type requires an internal jumper

*

switching.

0 to 50 mV 5 mV

0 to 10 V

*

0 to 20 mA 2 mA
4 to 20 mA 2 mA

Table 1 – Transmitter input sensors

thermocouples and 0.2 % for P t100 and vol tage;

Were: Vdc= Power supply voltag e

Ω.

Ω (+ 1.9 Vdc).

1 V

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 i nst ruc tions .

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 TxCo nfig software.

The TxConfig interface connects the transmitter to the PC, as shown in Fig.
1 and 2. There are two types of interface: TxConfig-RS232 and TxConfig-

USB.

Fig. 1 – TxConfig Interface connections model RS232

Fig. 2 – TxConfig Interface USB connections

Once the connection is accomplished, the software shows the configuration
options of the transmitter model attached. Access the Help for usage
instructions.

The TxConfi g screen in shown in Fig 3.

The TxConfig interfaces contain dedicated circuitry for proper

MECHANICAL INSTALLATION

The transmitter is intended for DIN rail mounting. Its drawing is presented in

Fig. 04.

Fig. 3 – TxConfig main screen

The fields in t he screen mean:

1. Input Sensor: Choose the desired temperature sensor among the
available optio ns . See Table 1.

2. Measuring Range: Defines the beginning and the end of the ra nge.

When the Low Scale Limit is configured with a value higher than the Full

Scale Limit, the current output will have a decrescent behavior (20~4
mA).

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 l ine frequency used in your c ountry.

4. Sensor Failure: establishes the transmitter output behavior (upscale or
down-scale) in the presence of a sensor fail.

5. Zero Correction: Al lows for small sensor corrections.

6. Device Information: The Device Information box contains relevant data

concerning a particular transmitter. Please pass along this information
when contacting the technical assistance departme nt.

7. Apply: Sends a new configurati on to the transmitter.

8. Read Device: Brings to the screen the current transmitter parameters

configuration.

Note: The factory default configuration is (unless otherwise specified or
ordered):

 Pt100 input, 0 to 100 ºC
 60 Hz filtering and upscale (20 mA) output for sensor fail .

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.

An external 9 V battery can be used for this purpose (Fig. 1). An alternative is
to configure the transmitter while it is in operation; this way, the needed energy
is supplied by the cur r ent l oop, as i n Fig. 4.

Fig. 4 – Transmitter dimensions

ELECTRICAL CONNECTIONS

Figure below shows the transmitter connections to the sensor and power
supply. Terminals 1, 2 e 3 are used for sensor input. For 2-wire Pt100,
terminals 2 and 3 shall be connected together.

Fig. 5 – Transmitter wiring (Pt100)

Fig. 6 – Transmitter wiring (Thermocouple)

The LOAD represents the input shunt of an instrument measuring the 4-20
current loop.

Fig. 4 – TxConfig Interface connections – Loop powered

communi cation between tr ansmitters an d computer. Alw ays make
use of the TxConfig interfaces for configuration purposes, otherwise
the transmitters may get damaged, voi ding the warr an ty.

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Electrical Connection s – 0-10 Vdc Input

For 0-10 Vdc input, the transmitter requires an internal hardware
configuration change. Please open the instrument case and change the
jumper show n in Fig. 07.

• Position 1-2 : 0-10 Vdc input

• Position 2-3 : all other input types

Fig. 7 – Jumper pos i ti on for 0-10 Vdc input