Tweedy™ Mixers Home › Customer Services › Upgrades › Tweedy™ Mixers Many innovations that improve performance and reduce cost of ownership on new machinery are available as upgrades for existing equipment. Solving issues such as insufficient capacity, poor reliability and outdated hygiene means original machine performance can be exceeded, and service life significantly extended. Upgrades available for Tweedy mixers include: Conversion to pressure vacuum This increases yield, improves bread quality, extends shelf life, and reduces ingredient costs. Control system replacement A new PLC control system uses recent developments in hardware and software to improve mixing consistency, and make operation and maintenance easier. Control system upgrades Mixers with the current generation of control system still benefit from upgrades. They improve operation, data capture, and reporting to enhance user-friendliness, increase efficiency and reduce downtime.