Azbil HPF-T034/T-34E Pipe-Mounted Liquid level Fiber Units provide fail-safe detection of tank upper and lower liquid level limits. An array of optical axes eliminates the effects of air bubbles and water droplets. With the HPFT-034 PFA-jacketed optic cables protected chemical resistant resin can be run through machines and equipment safety. The HPF Fiber unit was design for pipes 3 to 19 mm in diameter depending on the unit. Position of the optical axes easily visible. Fail-safe detection for upper and lower limits. When used with an HPX-EG amplifier (sold separately) you can set sensitivity – easy setup done without the process liquid.