21000-16-10-00-126-04-02 Bently Nevada Proximity Probe Housing Assembly For Sensor Maintenance Engineered strictly to API 670 standards, the aluminum Bently Nevada 21000-16-10-00-126-04-02 features an innovative externally accessible, explosion-proof design. This configuration directly eliminates the costly plant shutdowns typically required for sensor maintenance by allowing field technicians to safely adjust or replace the pre-installed 3300 XL probe entirely from outside