NOVUS AUTOMATION
1/4
TxIsoRail-HRT
TEMPERATURE TRANSMITTER - OPERATING MANUAL – V1.0x D
INTRODUCTION
The
TxIsoRail-HRT
is a configurable DIN rail 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
TxIsoRail-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 minimum and 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).
Pt1000
: Excitation 0.20 mA,
α
= 0.00385, according IEC 60751
(ITS-90).
NTC R
25
: 10 k
Ω
±1 %, β
25/85
= 3435
Voltage
: 0 to 50 mVdc.
Impedance >> 1 M
Ω
Sensor Type
Maximum Measurement
Range
Minimum Measurement
Range
Thermocouple K
-150 to 1370 °C
(-238 to 2498 °F)
50 °C
(122 °F)
Thermocouple J
-100 to 760 °C
(-148 to 1400 °F)
50 °C
(122 °F)
Thermocouple R
-50 to 1760 °C
(-58 to 3200 °F)
200 °C
(392 °F)
Thermocouple S
-50 to 1760 °C
(-58 to 3200 °F)
200 °C
(392 °F)
Thermocouple T
-160 to 400 °C
(-256 to 752 °F)
50 °C
(122 °F)
Thermocouple N
-270 to 1300 °C
(-454 to 2372 °F)
50 °C
(122 °F)
Thermocouple E
-90 to 720 °C
(-130 to 1328 °F)
50 °C
(122 °F)
Thermocouple B
500 to 1820 °C
(932 to 3308 °F)
200 °C
(392 °F)
Pt100
-200 to 650 °C
(-328 to 1202 °F)
30 °C
(86 °F)
Pt1000
-200 to 650 °C
(-328 to 1202 °F)
30 °C
(86 °F)
NTC
-30 to 120 °C
(-22 to 248 °F)
10 °C
(50 °F)
Voltage
0 to 50 mV
3 mV
Table 1
– Sensors accepted by the transmitter
Switch-on delay
: < 10 s with factory damping filter configured. The
accuracy is only guaranteed after 15 min.
Terms of reference
: Ambient: 25 ° C (77 °F); voltage: 24 Vdc, load:
250
Ω
. 10 minutes required for stabilization time after configuration.
Temperature Effect
: < 0.05 % / 25 °C (77 °F)
Response time
: Typical 6 s using 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 /
Ω
Maximum allowable cable resistance for RTD
: 25
Ω
Accuracy
: Calibration error in relation to sensor measuring range.
Sensor Type
CURRENT LOOP
HART
Typical
Error
Maximum
Error
Typical
Error
Maximum
Error
Pt100
(-200 to 650 °C)
0.08 %
0.15 %
0.05 %
0.15 %
Pt1000
(-200 to 650 °C)
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
– Input accuracy
(*) Add cold junction compensation
: < ± 1 °C (1.8 °F).
Power supply influence
: < 0.005 % / V typical (percentage of the
full measure range).
Output (4-20 mA)
:
4-20 mA current, 2-wires; 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 features electrical isolation between input and output:
1.5 kVrms
Internal protection against polarity inversion.
Cold junction compensation for thermocouples.
Connection Wire Cross Section
: 0.14 to 1.5 mm²
Screw Tightening
: 0.8 Nm.
Housing
: ABS UL94-HB.
Certifications
: CE and HART®.
