The YF-4EI from Luoyang Yida Automation Research Institute is a four-channel thermocouple measurement board based on a bare board design. It has the characteristics of low cost and high performance. Each measurement board can connect 4 channels of K or E type thermocouples, and can be expanded up to 16 modules through cascading. The measurement board uses a standard SPI interface to output temperature values after linearization, and has an open interface. In addition, it also has built-in automatic compensation for thermocouple cold end and thermocouple open circuit alarm.
The YF-4EIB is a bare‑board, four‑channel thermocouple measurement module (K, E types) that outputs linearized temperature values via a standard SPI interface. It can be cascaded to expand up to 16 modules.
The manual describes power connections, sensor wiring, SPI pin assignments, module address settings, sampling period options, and provides example PLC ladder‑logic code for reading temperature values. This manual is written in Chinese.
| Channel count | 4 |
|---|---|
| Supported thermocouple types | K, E |
| Power supply | +12 V (9 V‑26.4 V range) |
| Sampling period options | 1 s, 0.5 s, 0.1 s, 50 ms |
| Maximum cascade modules | 16 |
| Module address range | 0‑13 (0 and 15 reserved) |
The board provides four independent thermocouple channels.
You can choose 1 second, 0.5 second, 0.1 second or 50 ms sampling periods.
The address is set with the four‑position DIP switch SW1, allowing values 0‑13 (0 and 15 are reserved).
The analog power input accepts +12 V with an allowable range of 9 V to 26.4 V.