In modern cement plants, cement production is a continuous dry process, where the rotary kiln plays a key role. In the first step raw materials such as limestone, clay, sand, and iron ore are crushed in a cone mill and dried. This raw meal, or slurry, is then fed to a rotary kiln - an enormous rotating pipe - and heated at a temperature of 1.400–1.450°C to become clinker; in the cooling equipment the new compound is quickly cooled down to a temperature under 200°C. In the second step Gipsum or anhydrite are added to these grey-brown grains and ground in a ball mill to obtain cement as final product.
Inductive analogue sensors from Proxitron are mainly used at the drive of the rotary kiln or of the cone mill to check the rollers wear condition; to do this they continuously measure a defined distance: if this distance is not reached, rollers replacement or service is required. Inductive measuring sensors from Proxitron can be programmed via software to deliver an analogue output corresponding to a freely adjustable measuring range.
Similarly they can be used to control the drive of drum dryers, for example in several industrial production processes where bulk materials are involved, or in the chipboard industry at the dehydrating machine.
Apart from their robust construction, inductive analogue sensors from Proxitron are undisputed frontrunners in measurement topics. According to sensor size, measurement range can go from 0 up to 200 mm max, and ambient temperature up to 100°C. Parameters can be set via RS485 interface and software, or directly at the device.