PTC Thermistors POSISTOR® Application Manual 2008 by Murata Manufacturing Co.,Ltd.

More catalogs by Murata Manufacturing Co.,Ltd. | PTC Thermistors POSISTOR® Application Manual 2008 | 15 pages | 2013-07-26

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Page 10 of PTC Thermistors POSISTOR® Application Manual 2008

!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 08.9.25 4 practical applications of posistor® 1 heating automatic temperature adjustment heater 1 for general heater posistor can be used as a constant temperature heater that is self-regulating it does not need a thermostat to control temperature and inherently protects against abnormal temperature rise and failure constant temperature can be maintained by the varying applied voltage !general heaters !applications electric rice cooker electric pot hot plate inhaler humidifying device general heater antifreeze fax machine copy machine portable compact iron aromatic instrument and so on 10 t=5mm 5 t=2mm t=3mm power consumption w 3 2 e=120vr.m.s ta=25°c radiative plate aluminum plate same power marked as is obtained without radiative plate when water 20-30 cc is supplied and boiled on the pth 100 200 300 500 1000 2000 surface area of radiative plate cm2 4 ptwta ptwsb 1 !low thermal resistance type heaters capable of larger power output fig 9 characteristics of power consumprion ptwlb 2 for air heating posistor pills pellets are mounted in an aluminum radiator that is suitable for air heating the power and the temperature can be easily adjusted by varying the speed of the fan that blows air over the radiator also its power characteristics will change with changes in ambient temperature as shown fig 10 when the ambient temperature decreases the power increases when the ambient temperature increases the power is reduced !applications bath dryer clothes dryer futon dryer dish dryer hot-air heater auxiliary heater and so on ptwhc3af351y260d00 800 heat value w ambient temperature 25 15 5 -5 600 applied voltage ac220vrms 0 0 0.25 2 4 6 wind velocity m/sec 0.5 0.75 1.0 1.25 airflow m3/sec 8 1.5 10 1.75 700 500 ptwhc fig 10 heating power characteristics of air heater 3 for constant temperature control if a posistor is connected to another heater in series the posistor can be used to detect the change of the other heater s temperature and the change of the ambient temperature fig 11 !applications keep-warm plate humidifier and so on posistor heater heat connection power source ptwta ptwsb fig 11 heater control