Hermetic Switch introduces two new cylindrical or tubular proximity sensors: the PRX+3800 and PRX+3900. These magnetic sensors have strongly been reduced in size but still offer the advantages of switch sensing technology. They can be used in automation, control or detection in industrial, commercial, medical, corporate, government or military settings. The PRX+3800 is a Form B (Single Pole Single Throw Normally Closed) reed switch contained in a temperature resistant cylindrical housing which has a nominal size of 3.18 mm diameter and 19.05 mm length. The PRX+3900 is a Form C (Single Pole Double Throw) or change-over reed switch with similar housing and dimensions. These sensors have an operating distance of 6.35 mm and are rated at 2 watts. The maximum operating temperature is 105°C while the storage temperature range is -40°C to +105°C. The sensors are insensitive to electrostatic discharge.