Direct use of thermocouple module can reduce the number of devices and reduce the cost, and can be improved according to the different performance of manufacturers or models.

The current signal of temperature change → current (voltage) module can be used by other devices except PLC, which can reduce the model of PLC module and facilitate exchange and spare parts.

Therefore, when there are few thermocouple points in the system or other devices need to be connected, the scheme of temperature change → current (voltage) module should be considered.

However, large-scale and fully functional systems consider using thermocouple modules directly.

In fact, it mainly depends on the need, followed by the cost. There is nothing good about it.