Features:
>> Eight channels thermocouple signal acquisition, isolation
conversion RS-485/232 output
>> 24-bit AD converter, measurement accuracy is better than
0.1%
>> Accurate calibration module accuracy can be programmed via
RS-485/232 interface
>> Isolation between the signal input / output voltage
3000VDC
>> Wide power supply range: 8 ~ 32VDC
>> J / K / T / E / R / S / B type thermocouple input
>> High reliability, easy programming, easy to use
>> Standard DIN35 rail mounting for easy centralized wiring
>> The user can program the module address, baud rate and so
on
>> Support Modbus RTU communication protocol
>> Low cost, small size
Typical application:
>> Temperature signal measurement, monitoring and control
>> RS-485 remote I / O, data acquisition
>> Intelligent building control, security engineering and
other applications
>> RS-232/485 bus industrial automation and control system
>> Industrial field signal isolation and long-term
transmission
>> Equipment operation monitoring
>> Measurement of sensor signals acquisition and record of industrial field data
>> Medical, industrial product development
>> Various types of thermocouple signal acquisition
Product selection:
1.WJ27-485 (8-channel thermocouple signal input, output is RS-485
interface)
2.WJ27-232 (8-channel thermocouple signal input, output is RS-232
interface)
WJ27 General parameters:
(typical @ +25 ℃, Vs to 24VDC)
Input type: thermocouple signal input, supports a variety of
thermocouple signal, J/K/T/E/R/S/ B type thermocouple
Accuracy: 0.1% ( not contains cold junction sensor error)
Temperature drift:± 30 ppm / ℃ (± 50 ppm / ℃, maximum)
Input resistance: >1MΩ
Cold junction compensation sensor accuracy: ± 0.5 ℃
Bandwidth: -3 dB 10 Hz
AD Conversion rate: 10 Sps
Common Mode Rejection (CMR): 120 dB (1kΩ Source Imbalance @ 50/60
Hz)
Normal Mode Rejection (NMR): 60 dB (1kΩ Source Imbalance @ 50/60
Hz)
Input Protection: over-voltage protection, over-current protection
Communication: RS-485 protocol or RS-232 standard characters
protocols and MODBUS RTU communication protocol
Baud Rate (2400,4800,9600,19200,38400,57600,115200 bps) can be
selected via software
Address (0 to 255) can be selected via software
Communication Response Time: 100 ms maximum
Power Supply: +8 ~ 32VDC wide range power supply, internal
anti-reverse and over-voltage protection circuit
Power Loss: less than 1W
Operating Temperature: - 45 ~ +80 ℃
Humidity: 10 ~ 90% (no condensation)
Storage Temperature: - 45 ~ +80 ℃
Storage Humidity: 10 ~ 95% (no condensation)
Isolation Voltage: input / output: 3KVDC, 1 minute, leakage
current:1mA
Which output signal and power supply are common ground.
Shock Voltage: 3KVAC, 1.2/50us (peak)
Dimensions: 120 mm x 70 mm x 43mm
More details,please check
:http://www.wayjun.net/Datasheet/Signal/WJ27-EN.pdf
Footprint Function:
| PIN | Name | Description | PIN | Name | Description |
| 1 | IN5+ | Channel 5 thermocouple signal input + | 11 | IN0- | Channel 0 thermocouple signal input - |
| 2 | IN5- | Channel 5 thermocouple signal input - | 12 | IN0+ | Channel 0 thermocouple signal input + |
| 3 | IN6+ | Channel 6 thermocouple signal input + | 13 | IN1- | Channel 1 thermocouple signal input - |
| 4 | IN6- | Channel 6 thermocouple signal input - | 14 | IN1+ | Channel 1 thermocouple signal input + |
| 5 | IN7+ | Channel 7 thermocouple signal input + | 15 | IN2- | Channel 2 thermocouple signal input - |
| 6 | IN7- | Channel 7 thermocouple signal input - | 16 | IN2+ | Channel 2 thermocouple signal input + |
| 7 | DATA+ | RS-485 signal + | 17 | IN3- | Channel 3 thermocouple signal input - |
| 8 | DATA- | RS-485 signal - | 18 | IN3+ | Channel 3 thermocouple signal input + |
| 9 | PW+ | Power supply + | 19 | IN4- | Channel 4 thermocouple signal input - |
| 10 | GND | Power supply-, digital signal output ground | 20 | IN4+ | Channel 4 thermocouple signal input + |
