8-way NTC thermistor temperature conversion to RS-485/232, data acquisition module WJ226

Product features:

● Eight channel NTC temperature acquisition, isolated conversion to RS-485/232 output

● Can be quickly customized and linearized according to the NTC scale table

● Supports various NTC sensors such as NTC5K/10K/20K/100K

●Using a 12 bit AD converter, the measurement accuracy is better than 0.1%

●Isolation withstand voltage between signal input/output 1000VDC

●Wide power supply range: 8~32VDC

●High reliability, easy programming, and easy application

●Standard DIN35 rail installation, convenient for centralized wiring

● Users can program module addresses, baud rates, etc

● Supports Modbus RTU communication protocol and automatic protocol recognition

●Industrial flame retardant shell, RS485 port surge protection

Typical applications:

●NTC temperature signal measurement

●RS-485 remote I/O, data acquisition

●Intelligent building control, security engineering and other application systems

●RS-232/485 bus industrial automation control system

●Industrial site signal isolation and long-distance transmission

● Equipment operation monitoring

●Measurement of sensor signals

● Acquisition and recording of industrial field data

●Development of medical and industrial control products

●Thermistor signal acquisition

Product Overview:

The WJ226 product realizes signal acquisition between sensors and hosts, used to detect NTC thermistor temperature signals. The WJ226 series products can be applied in

RS-232/485 bus industrial automation control system, NTC thermistor temperature signal measurement, industrial field signal isolation and long-distance transmission, etc.

The product includes power isolation, signal isolation, linearization, A/D conversion, and RS-485 serial communication. Each serial port can connect up to 255 WJ226 series devices

Module, communication method adopts ASCII code communication protocol or MODBUSRTU communication protocol, baud rate can be set by code, and can be compatible with control modules from other manufacturers

The blocks are hung on the same RS-485 bus for easy computer programming.

WJ226 General Parameters:

(Typical @+25 ℃, Vs is 24VDC)

Input type: NTC thermistor input

Accuracy: 0.1%

Temperature drift: ± 50ppm/℃ (± 100ppm/℃, maximum)

Bandwidth: -3dB 10Hz

Conversion rate: 5Sps (factory default value, users can modify the conversion rate by issuing commands). ）

You can set the AD conversion rate to 2.5SPS, 5SPS, 10SPS, and 20SPS by sending commands. Channel conversion rate=AD

Conversion rate/number of channels opened)

Note: Please recalibrate the module after modifying the conversion rate, otherwise the measured data may have deviations. You can also specify the transfer when placing an order

We recalibrate the conversion rate according to your requirements when the product leaves the factory.

Common mode rejection (CMR): 120dB (1k Ω) SourceImbalance@50 /60Hz）

Norm suppression (NMR): 60dB (1k Ω) SourceImbalance@50 /60Hz）

Input protection: overvoltage protection, overcurrent protection

Communication: RS-485 or RS-232 standard character protocol and MODBUSRTU communication protocol

Baud rates (2400, 4800, 9600, 19200, 38400, 57600, 115200bps) can be selected by software

The address (0-255) can be selected by software

Communication response time: 100ms maximum

Working power supply:+8~32VDC wide power supply range, with internal anti reverse and overvoltage protection circuits

Power consumption: less than 1W

Working temperature: -40~+85 ℃

Working humidity: 10~90% (no condensation)

Storage temperature: -40~+85 ℃

Storage humidity: 10~95% (no condensation)

Isolation withstand voltage: 1KVDC between input/output, 1 minute, leakage current 1mA

The RS-232/RS-485 output and power supply are grounded together.

Surge resistant voltage: 3KVAC, 1.2/50us (peak)

Dimensions: 120mm x 70mm x 43mm