HR-WP40 series isolation module is a type of miniature card-mounted instrument. It can convert 4～20mADC or 1～5VDC signal to 4～20mADC or 1～5VDC signal and transfer to indicator, recorder, analog modulators, programmable single / multi-loop digital regulator, distributed control systems and industrial process control machines, etc to form a variety of automatic monitoring and control systems.  Therefore, this isolation module is an indispensable instrument to form non-explosion-proof control system.