NOVUS AUTOMATION
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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 M
Ω
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
25°C
: 10 k
Ω
±1 %, B
25/85
= 3435.
Voltage
: 0 to 50 mVdc.
Impedance >> 1 M
Ω
.
Sensor Type
Maximum Measurement
Range
Minimum
Retransmission Range
Thermocouple K
-150 to 1370 °C
(-238 to 2498 °F)
50 °C
(90 °F)
Thermocouple J
-100 to 760 °C
(-148 to 1400 °F)
50 °C
(90 °F)
Thermocouple R
-50 to 1760 °C
(-58 to 3200 °F)
200 °C
(360 °F)
Thermocouple S
-50 to 1760 °C
(-58 to 3200 °F)
200 °C
(360 °F)
Thermocouple T
-160 to 400 °C
(-256 to 752 °F)
50 °C
(90 °F)
Thermocouple N
-270 to 1300 °C
(-454 to 2372 °F)
50 °C
(90 °F)
Thermocouple E
-90 to 720 °C
(-130 to 1328 °F)
50 °C
(90 °F)
Thermocouple B
500 to 1820 °C
(932 to 3308 °F)
200 °C
(360 °F)
Pt100
-200 to 650 °C
(-328 to 1202 °F)
30 °C
(54 °F)
Pt1000
-200 to 650 °C
(-328 to 1202 °F)
30 °C
(54 °F)
NTC
-30 to 120 °C
(-22 to 248 °F)
10 °C
(18 °F)
Voltage
0 to 50 mV
3 mV
Table 1
– Sensors accepted by the transmitter
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) /
Ω
.
Maximum allowable cable resistance for RTD
: 25
Ω
.
Accuracy
: Calibration error in relation to sensor measuring range
(Full Scale).
Sensor Type
CURRENT LOOP
HART
Typical
Accuracy
Minimum
Accuracy
Typical
Accuracy
Minimum
Accuracy
Pt100
(-200 to 650 °C)
(-328 to 1202 °F)
0.08 %
0.15 %
0.05 %
0.15 %
Pt1000
(-200 to 650 °C)
(-328 to 1202 °F)
0.07 %
0.15 %
0.04 %
0.15 %
K, J, R, S, T, N,
E, B
0.07 % (
*
)
0.15 % (
*
)
0.04 % (
*
)
0.15 % (
*
)
mV
0.07 %
0.15 %
0.04 %
0.15 %
NTC
0.20 °C
(0.36 °F)
0.45 °C
(0.81 °F)
0.15 °C
(0.27 °F)
0.45 °C
(0.81 °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
µ
A.
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®.
