Manual

29
15.8 8-ch Pt100/Pt1000 input module
The detail of the external power supply is: the rated supply voltage is 24 VDC, the rated
input voltage ranges from DC20.4 to 28.8 V. The consumption current is 140 mA (24 VDC)
when the input is not-open, output 100%.
EXM-ARI8LT
Sensor type Temperature Probes
Input Range
Pt1000: -50 to +200°C (-58 to +392°F)
Pt100: -200 to +600°C (-328 to +1112°F)
Input Impedance 10 kΩ min.
Input Points 8 points
A-D
Conversion
Sample Repetition Time 320 ms per channel
Total Input System
Transfer Time*
1
4x320 ms + 1 scan time
Input Type Differential input
Operating Mode Self-scan
Conversion Mode Σ∆ type ADC
Input Error Maximum Error at 25°C
(77°F)
Pt1000: ±0.5°C (0.9°F)
Pt100: ±1.5°C (2.7°F)
Range -50°C (-58°F) to +200°C (+392°F):
±1°C(±33.8°F)
Range -200°C (392°F) to 600°C (1112°F):
+0.1% / -0.5% full scale
Temperature Coefficient ±0.5°C (0.9°F)
Characteristics of
Voltage, Current
& Temperature
Inputs
Repeatable after
Stabilization Time
±0.1°C (±32.18°F)
Total maximum deviation
Pt1000: ±1°C (±33.8°F)
Pt100: +1°C (33.8°F)/-4°C (24.8°F)
Data Digital Resolution 4096 increments (12 bits)
Input Value of LSB
Pt1000: 0.06°C (0.108°F)
Pt100: 0.2°C (0.36°F)
Data Type in Application
Program
0 to 4095 (12 bit)
Custom range up to -32768 to +32767*
2
Input Data Out of Range Detectable*
3
*
4
Broken wire detection Detectable*
3
Noise
Resistance
Cable
Twisted-pair shielded cable is
recommended for improved noise immunity
Crosstalk 1 LSB max.
Voltage Endurance
-2500 VAC between inputs, external
power supply and internal logic circuits
-
1500 Vrms between inputs and internal bus
- 500 Vrms between inputs and ground
-1500 Vrms between internal bus and
ground
Isolation Method
Photocoupler Isolation between input and
internal circuit (1500 VDC isolation)