Description

This product is a combined acquisition module of 8-channel thermal resistance PT, CU, NI and 8-channel analog 20mA, 5V, 10V, 30V.

Option 1: 8-channel PT100 + 8-channel 0-20mA

Option 2: 8-channel PT100 + 8-channel 4-20mA

Option 3: 8-channel PT100 + 8-channel -20-30v

Please note other specifications,

For example: 8 channels (PT1000, CU50, Cu100, NI1000) + 8 channels (20mA, 4-20mA, 5V, 10V, 30V).

The current must be input from the IN terminal and output from the GND terminal, and the collected value is a positive number: in turn, the collected value is a negative number.

The difference between 0-20mA and 4-20mA:

• 0-20mA can measure 20mA current of positive and negative input, actually can measure -15mA to +20mA:

• 4-20mA can only measure 4-20mA current, and cannot measure negative value current (less than 4mA acquisition value is 0)

Main features

Temperature acquisition module based on RS485 interface and Modbus protocol.

Power supply, acquisition, communication three-terminal isolation, standard MODUUS RTU protocol. All input interfaces have overvoltage protection.

Support PT, Cu, NI temperature sensor two-wire, three-wire connection. The three-wire connection method (the resistance of the three leads is the same) can completely eliminate the error caused by the lead resistance.

The sensor head leads can be up to 150 meters without affecting the measurement data.

The temperature calculation is completed inside the module, and the temperature value can be directly read in degrees Celsius.

Measuring range: PT type sensor: temperature -180℃～+650℃, resolution 0.1℃;

CU100\50: -50℃～+150℃; NI1000: -60℃～+250℃

The accuracy can reach 0.25°C in the range of -20°C to +150°C. The accuracy of other temperature ranges is better than 0.5℃.

Power supply: DC 8-30V.

It adopts standard 35mm rail installation method.

Dimensions: 155L*110W*60H

Working temperature: -35℃～+50℃.

Application field: liquid and gas temperature measurement field.

2. Common product model pictures and interfaces

A: RS485 serial communication A

B: RS485 serial communication B

Power supply V+: DC power positive pole

Power GND: DC power negative Power GND and signal GND are completely isolated.

GND: Sensor common terminal and analog-common terminal. AIN(n): Analog + input terminal.

Three-wire connection:

RTD(n)+: sensor power supply terminal, about 0.5mA output.

RTD(n)-: Sensor measurement input.

GND: Sensor common terminal.

Two-wire connection:

RTD(n)+: sensor power supply terminal + measurement input terminal, about 0.5mA output.

RTD(n)-: need to be shorted to GND.

GND: The other end of the sensor.