NOVUS TxBlock-USB Transmitter - Manual

NOVUS AUTOMATION 1/4
TxBlock-USB Transmitter
TEMPERATURE TRANSMITTER - OPERATING MANUAL – V1.0x B
INTRODUCTION
The TxBlock-USB is a 4-20 mA 2-wire temperature transmitter for
head mount, powered by the current loop. Its configuration is
accomplished by connecting the transmitter to a PC USB port without
the need of any dedicated interface. The configuration does not
require that the transmitter be powered.
The output current is linearized and adjusted in fuction of the input
sensor type and range configured.
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 and E, accoding to IEC
60584 (ITS-90). Impedance >> 1 MΩ
Pt100: Type 3-wire, Excitation 0.8 mA, α= 0.00385,
according IEC 60751 (ITS-90).
For 2-wire sensors, tie terminals 3 and 4
together.
Pt1000: Type 3-wire, Excitation 0.17 mA, α= 0.00385,
according IEC 60751 (ITS-90).
For 2-wire sensors, tie terminals 3 and 4
together.
NTC R
25°C
: 10 kΩ ±1 %, B
25/85
= 3435
Voltage: 0 to 50 mVdc. Impedance >> 1 MΩ
Sensor Type
Maximum Measurement
Range
Minimum Measurement
Range
Voltage 0 to 50 mV 5 mV
Thermocouple K -150 to 1370 °C 100 °C
Thermocouple J -100 to 760 °C 100 °C
Thermocouple R -50 to 1760 °C 400 °C
Thermocouple S -50 to 1760 °C 400 °C
Thermocouple T -160 to 400 °C 100 °C
Thermocouple N -270 to 1300 °C 100 °C
Thermocouple E -90 to 720 °C 100 °C
Thermocouple B 500 to 1820 °C 400 °C
Pt100 -200 to 650 °C 40 °C
Pt1000 -200 to 650 °C 40 °C
NTC -30 to 120°C 40 °C
Table 1 – Sensors accepted by the transmitter
Switch-on delay: < 2.5 s. The accuracy is only guaranteed after 15
min.
Calibration error: < 0.11 % (RTD and mV) and < 0.15 % (TC).
Terms of reference: ambient: 25 ° C; voltage: 24 Vdc, load: 250 Ω;
settling time: 10 minutes.
Temperature Effect: < ±0.16 % / 25 °C
Cold junction compensation: < ±1 °C.
Response time: typical 1.6 s.
Maximum voltage allowed at input terminals no sensor: 3 V.
RTD current: 800 µA.
RTD cable resistance effect: 0.005 °C /
Ω
Maximum allowable cable resistance for RTD: 25 Ω .
Sensor Type
Typical
Accuracy
Minimun
Accuracy
Pt100 / Pt1000 0.08 % 0.12 %
mV, K, J, T, E, N, R, S, B 0.1 % 0.15 %
NTC 0.3 °C 0.7 °C
Table 2 – Calibration error, percentage of the full measurement range.
Power supply influence: 0.006 % / V typical (percentage of the full
measure range).
Output: 4-20 mA or 20-4 mA current, 2-wired; linear in relation to the
temperature measurement by the selected sensor.
Output Resolution: 2 µA.
Power supply: 8 to 35 Vdc, across the transmitter;
Maximum load (RL): RL (max.) = (Vdc – 8) / 0.02 [Ω]
Where: Vdc= Power supply voltage (8-35 Vdc)
Operating Temperature: -40 to 85 °C
Humidity: 0 to 90 % RH
Compatibilidade Eletromagnética: EN 61326-1:2006
No electrical isolation between input and output..
Internal protection against polarity inversion.
Cold junction compensation for thermocouples.
Dimensions: 43.5 mm (diameter) x 20.5 mm (height)
Connection Wire Cross Section: 0.14 a 1.5 mm²
Screw Tightening: 0.8 Nm.
Housing: ABS UL94-HB.
CONFIGURATION
The factory configuration for the transmitter is sensor Pt100 with a
range of 0 to 100 °C and upscale error condition. If this configuration
fits the system requirement, no further action is required and the
transmitter is ready to be installed. Changes to the configuration are
possible trhough the TxConfig II software, provided free of charge.
A TxBlock-USB Setup Kit consisting of the Txconfig II software and
USB cable can be purchased from the manufacturer or any authorized
distributor. The Txconfig II software is continuously updated and new
versions can be downloaded at no charge from the manufacturer’s
website. To install, execute the TxConfigIISetup.exe file and follow the
instructions.
Fig. 1 – USB cable connection