Description: The PET chips should be dried and free from moisture before the extrusion process to improve quality and appearance of finished products. Careful control of this drying process is an essential pre-requisite for product quality. The recognised practice is to expose the chips to an air of dewpoint below -40°C for a fixed period. Problems in drying process including air filters blocking, return air cooling, heater failure and ingress of air are the more common troubles faced. For finding out these troubles, online and spot-checking of dewpoint should be measured continuously. Vaisala - Finland, well-known makers of humidity and dewpoint monitors helps in the above process. Their model DM 70 is useful for spot-checking since it is a hand-held dewpoint meter. Vaisala DMT 242 model is an ideal choice for online continuous measuring of dewpoint. It is designed with IP 65 housing to protect from dust, dirt and splashed water. This model provides wide measurement range -60°C to +60°C with an accuracy of ±2°C. It gives fast response time and withstands condensation.
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