Oct 07, 2011. /Lesprom Network/. BTG Instruments launches the new BT-55 series of brightness transmitters for monitoring and control of bleaching chemicals, optical brightening agents and dyes in mechanical and chemical pulps, recycled fiber and paper machine applications, as the company said in a press release received by Lesprom Network. The BT-55 series comprises three versions - BT-5500, BT-5510 and BT-5520 - hence meeting all installation requirements. The transmitters feature a unique low-maintenance probe and are standardly equipped with a UV light source for fluorescence measurement. They are intended for optimizing chemical addition, minimizing product variability and reducing operational costs. As part of BTG's easier, smaller, smarter, lighter product range the BT-55 series is designed to help papermakers rapidly improve their process and significantly save costs.