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LCD thermometer





In this page, I introduce the LCD thermometer which is sold by "Akizuki Denshi Tsusho".
At this thermometer, the IC thermo sensor (S8100) or the diode (1S1588) is used as the thermo sensor. When using the IC thermo sensor, the thermometry to +100C from -40C is possible. Also, when using the diode, the measurement to +150C from -20C is possible. Both sensors are contained in the kit.
This time, I used the diode as the thermo sensor to measure more than +100C.
ICL7136 of Intersil (Harris) is used for the thermometer and is measuring the change of the forward direction minute voltages of the diode by the temperature. The 3-1/2 digits liquid crystal display (SP521PR) is used for the display. The most significant digit can display only "1".
The consumption electric power of ICL7136 is very small and it is possible to operate about 3 months continuously with the 9-V cell.

The main parts are contained in the kit. The plastic case and the cell are contained. But, there is not a connection cable of the sensor.