QBL series pneumatic target flow transmitter is a transmit unit of pneumatic instrument. it is used to continuously measure the flow of high viscosity media, and the medium with suspended particles. If it is used with display instrument or regulator, it will do auto recording and regulating for measured medium. The transmitter can be used in the explosion occasion. It can measure corrosive media. It can install on the channel directly without throttling device. It is simple, cheap and easy to maintain.