Protection tube ensures 100% accurate sensor performance Double laser-welded stainless steel body is totally submersible to seal tight and protect against contamination for long life Fast-acting heater optimizes sensor operation (on3- and 4- wire sensors only) Coated threads for easy installation Bosch Premium Thimble Type Sensors utilize an electrical heating element inside the thimble-shaped end to bring the sensor up to operating temperature in less than a minute. The patented thimble ceramic element featuring the Bosch patented Platinum Power Grid and the patented Bosch Double Layer Protection System optimize sensing, peak performance, and maximum service life.
