Portacel (UK), specialists in the provision of gas and liquid dosing technology and associated monitoring and control systems, has launched a new Clyde gas doser and a new auto valve positioner, the AVP2, both having application in the disinfection of drinking water and in wastewater treatment. The new Clyde unit is a manual, vacuum-operated chlorine gas doser and has an operating range of 25 g/hr to 12 kg/hr. To improve the Clyde’s performance under varying temperature conditions the Upvc body of the previous model has been replaced with ABS. Fewer working parts yield improved serviceability. This improved Clyde doser has an interchangeable metre tube and control valve to allow simple upgrading should chlorine demand increase in the future. The auto valve positioner, version 2 (AVP2), is an integral part of Portacel’s Thames and Trent automatic doser. It uses a dedicated, microprocessor to position a control valve precisely in response to station flow signals and/or residual chlorine analysis. It comprises a simple, menu-driven programme, requiring no software knowledge, and has a four-line 20-character high-resolution display. The display parameters may also be viewed from a laptop.
