Protocontrol Instruments [India] Pvt Ltd offers Level Control Capacitive Proximity Switch. Protocontrol Instruments [India] Pvt Ltd is an ISO 9001:2000 certified organization. Protocontrol Instruments [India] Pvt Ltd also manufactures Digital Process Control Instruments, Temperature & Humidity Measurement, and Signal Conditioning Products etc. The Level Control Capacitive Proximity Switch detects both metallic as well as non-metallic objects. The larger the dielectric constant of the object, the larger is the sensing range of the switch. The Level Control Capacitive Proximity Switch is used in - level control, presence control, level control of bulk solids and powders, final inspection of packaging procedures.