Novus TxIsoBlock-HRT Operating Manual

TxIsoBlock-HRT
TEMPERATURE TRANSMITTER - OPERATING MANUAL – V1.1x
INTRODUCTION
The TxIsoBlock-HRT is a configurable head mount temperature
transmitter widely required in various industrial processes. Its
universal input can be configured to read RTDs, thermocouples and
mV signals.
It converts the input signal into a 4-20 mA linear output proportional
to the configured range. The TxIsoBlock-HRT uses the HART®
communication protocol over the 4-20 mA output current loop.
The input and output are electrically isolated, enhancing their
performance and user and system safety.

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, according to
IEC 60584 (ITS-90).
Impedance >> 1 MΩ
Pt100: Excitation 0.15 mA, α= 0.00385, according IEC 60751
(ITS-90).
For 2-wire sensors, tie terminals 3 and 4 together.
Pt1000: Excitation 0.20 mA, α= 0.00385, according IEC 60751
(ITS-90).
For 2-wire sensors, tie terminals 3 and 4 together.
NTC R : 10 kΩ ±1 %, B
25°C
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Voltage: 0 to 50 mVdc. Impedance >> 1 MΩ.
Maximum Measurement
Sensor Type
Range
Thermocouple K -150 to 1370 °C
(-238 to 2498 °F)
Thermocouple J -100 to 760 °C
(-148 to 1400 °F)
Thermocouple R -50 to 1760 °C
(-58 to 3200 °F)
Thermocouple S -50 to 1760 °C
(-58 to 3200 °F)
Thermocouple T -160 to 400 °C
(-256 to 752 °F)
Thermocouple N -270 to 1300 °C
(-454 to 2372 °F)
Thermocouple E -90 to 720 °C
(-130 to 1328 °F)
Thermocouple B 500 to 1820 °C
(932 to 3308 °F)
Pt100 -200 to 650 °C
(-328 to 1202 °F)
Pt1000 -200 to 650 °C
(-328 to 1202 °F)
NTC -30 to 120 °C
(-22 to 248 °F)
Voltage 0 to 50 mV
Table 1 – Sensors accepted by the transmitter
NOVUS AUTOMATION
= 3435.
Minimum
Retransmission Range
50 °C
(90 °F)
50 °C
(90 °F)
200 °C
(360 °F)
200 °C
(360 °F)
50 °C
(90 °F)
50 °C
(90 °F)
50 °C
(90 °F)
200 °C
(360 °F)
30 °C
(54 °F)
30 °C
(54 °F)
10 °C
(18 °F)
3 mV
Switch-on delay: < 10 s with damping filter set to factory setting.
The accuracy is only guaranteed after 15 min.
Terms of reference for accuracy: Ambient: 25 °C (77 °F); voltage:
24 Vdc, load: 250 Ω. Stabilization time of 15 minutes after any
setting is required.
Temperature effect:
NTC: < 0.11 % FS / 25 °C (45 °F)
Other sensors: < 0.05 % FS / 25 °C (45 °F)
(FS = Full Scale).
Response time: Typical 6 s with factory damping filter. This is the
maximum time between a temperature step being applied in the input
and the output reaching 90 % of the corresponding value.
HART protocol version: 7.
RTD cable resistance effect: 0.005 °C (0.009 °F) /
Maximum allowable cable resistance for RTD: 25
Accuracy: Calibration error in relation to sensor measuring range
(Full Scale).
CURRENT LOOP
Sensor Type
Typical
Accuracy Accuracy
Pt100
(-200 to 650 °C) 0.08 %
(-328 to 1202 °F)
Pt1000
(-200 to 650 °C) 0.07 %
(-328 to 1202 °F)
K, J, R, S, T, N,
0.07 % ( * )
E, B
mV 0.07 %
0.20 °C
NTC
(0.36 °F)
Table 2 – Accuracy of input types
(*) Add Cold Junction compensation: < ± 1 °C (1.8°F).
Power supply influence: < 0.005 % / V (percentage of the full
measure range).
Output (4-20 mA): 4-20 mA current, 2-wired; linear and proportional
to the configured range.
Output resolution (4-20 mA): 0.25 µA.
Power supply: 8.5 to 36 Vdc (output 4-20 mA).
Maximum load (RL): RL (max.) = (Vdc – 8.5) / 0.0215 [Ω]
Where: Vdc = Power supply voltage
(8.5 to 36 Vdc)
Operating temperature: -40 to 85 °C (-40 to 185 °F).
Humidity: 0 to 90% RH.
It presents electrical isolation between input and output of 1.5
kVrms.
Internal protection against reverse polarity of the supply voltage.
Cold Junction compensation for thermocouples.
Connection wire cross section: 0.14 to 1.5 mm².
Screw Tightening: 0.8 Nm.
Housing: Polyamide.
Certification: CE and HART®.
Ω.
Ω.
HART
Minimum Typical Minimum
Accuracy Accuracy
0.15 % 0.05 % 0.15 %
0.15 % 0.04 % 0.15 %
0.15 % ( * ) 0.04 % ( * ) 0.15 % ( * )
0.15 % 0.04 % 0.15 %
0.45 °C 0.15 °C 0.45 °C
(0.81 °F) (0.27 °F) (0.81 °F)
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