The BT series intelligent instrument instruction manual of Bert Industrial Control is a product with rich functions and easy-to-use operation. It adopts industrial-grade single-chip microprocessor, four-and-a-half A/D conversion and digital correction and filtering technology to ensure measurement accuracy. The product has multiple linear and nonlinear input specifications, which can be selected online. It has an advanced modular structure, and is easy to configure, maintain, replace and expand functions. The product also has perfect self-tuning and self-adaptive functions to reduce the debugging workload. The product supports external output and can be used to construct cascade and ratio control systems. It supports RS232 and RS485 communications, and can directly drive the micro printer to print data at a fixed time. The product has two-level menu configuration and four-level operating permissions to ensure system security.