Instrument Tubing Bundles – Raychem RTB tubing bundles utilizing electric tracing are designed to maintain freeze protection, close temperature tolerances, or viscosity control. They provide an excellent means of maintaining very long, continuous lengths of impulse lines and piping at consistent temperatures end-to-end. These bundles are used when the maintain temperature ranges from 10°C (50°F) to 121°C (250°F). Utilizing Raychem self regulating heater technology, this system will lower its heat output as the process tube gets warmer. Optional line sensing controllers allow for close temperature control, if necessary.