NOVUS TxRail 4-20 mA User Manual
Page 3
TxRail 4-20 mA
NOVUS AUTOMATION
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SPECIFICATIONS
Sensor input: User defined. The supported sensors are listed in
Table 01, along with their maximum ranges.
Thermocouples: Types J, K, R, S, T, N and E, to IEC 60584
(ITS-90).
Impedance >> 1 M
Pt100:
Excitation: 0.18 mA, 2 or 3-wire connection
(for 2-wire sensors, tie terminals 2 and 3
together).
= 0.00385, according to IEC 60751 (ITS-90).
Voltage:
0 to 50 mVdc. Impedance >> 1 M
Sensor Type
Range
Minimum measurement
span
Thermocouple K
0 to 1370 °C
100 °C
Thermocouple J
0 to 760 °C
100 °C
Thermocoupler R
0 to 1760 °C
400 °C
Thermocouple S
0 to 1760 °C
400 °C
Thermocouple T
0 to 400 °C
100 °C
Thermocouple N
0 to 1300 °C
100 °C
Thermocouple E
0 to 720 °C
100 °C
Pt100
-200 to 650 °C
40 °C
Voltage
0 to 50 mV
5 mV
Table 01 – Transmitter input sensors
Output: 2-wire 4-20 mA, linear with respect to the measured
temperature.
Total accuracy: better than 0.3 % of the maximum range for
thermocouples and 0.2 % for Pt100 and voltage;
Resolution: 0.004 mA (12 bits)
Resposta time: < 100 ms
Power supply: 18 to 35 Vdc, across the transmitter;
Maximum load (RL): RL (Ohms max.) = (Vcc – 12) / 0.02 [ ]
Where: Vcc = Power supply voltage
Operating temperature: -40 to 85 °C
Humidity: 0 a 90 % RH
Electromagnetic compatibility: EN 50081-2, EN 50082-2
No isolation between the sensor and the 4-20 mA loop.
Internal protection against polarity inversion.
Cold junction compensation for thermocouples.
Housing: ABS plastic. Dimensions: Refer to Figure 05.
SAFETY INFORMATION
Any control system design should take into account that any part of the
system has the potential to fail. This product is not a protection or
safety device and its alarms are not intended to protect against product
failures. Independent safety devices should be always provided if
personnel or property are at risk.
Product performance and specifications may be affected by its
environment and installation. It’s user’s responsibility to assure proper
grounding, shielding, cable routing and electrical noise filtering, in
accordance with local regulations, EMC standards and good installation
practices.
SUPPORT AND MAINTENANCE
This product contains no serviceable parts inside. Contact our local
distributor in case you need authorized service. For troubleshooting,
visit our FAQ
LIMITED WARRANTY AND LIMITATION OF
LIABILITY
NOVUS warrants to the original purchaser that this product is free from
defects in material and workmanship under normal use and service
within one (1) year from the date of shipment from factory or from its
official sales channel to the original purchaser.
NOVUS liability under this warranty shall not in any case exceed the
cost of correcting defects in the product or of supplying replacement
product as herein provided and upon the expiration of the warranty
period all such liability shall terminate.
For complete information on warranty and liability limitations, check
appropriate section in our web site