Friday, 19 December 2014
PROGRAMMABLE TEMPERATURE MONITOR AND CONTROLLER FOR INDUSTRIAL BOILERS & OVENS
PROGRAMMABLE TEMPERATURE MONITOR AND
CONTROLLER FOR INDUSTRIAL BOILERS & OVENS
ABSTARACT:
This project is a
standalone digital temperature meter that also controls the temperature of the
heating element of a device according to its requirement. Use of embedded
technology makes this closed loop feedback control system efficient and
reliable. Micro controller (AT89S52) allows dynamic and faster control. Push
button switches and liquid crystal display (LCD) make the system user-friendly.
The sensed and set temperature values are simultaneously displayed on the LCD
panel. The circuit is programmed for on/ off control. It is very compact using
few components and can be implemented for several applications including
air-conditioners, water-heaters, snow-melters, ovens, heat-exchangers, mixers,
furnaces, incubators, thermal baths and veterinary operating tables. AT89S52
micro controller is the heart of the circuit as it controls all the
functions.
The temperature sensor LM35 senses the temperature and converts it
into an be provided by the micro controller. S electrical signal, which is applied to the micro controller through
ADC. The analog signal is converted into digital format by the
analog-to-digital converter (ADC). The sensed and set values of the temperature are displayed
on the 16x2-line LCD. The micro controller drives a transistor to control the
heating element with the help of an electromagnetic relay. The set temperature
value can be varied from 1C to 255C using an external PCB mount push on switch
A double pole double throw (DPDT) relay is connected to the micro controller
through a driver transistor. The relay requires 5 volts at a current of around
50 mA, which can not This project uses regulated 5V, 500mA power supply. 7805
three terminal voltage process industries for maintenance and controlling of
Boilers temperature
the ac out put of
secondary of 230/12V step down transformer. This project is useful
ADVANTAGES:
Ø Simple
to construct
Ø More
economic
APPLICATIONS:
Ø industries
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