Functions TERMOMETER DIGITAL for Warehouse

Digital Thermometer Functions

 

The thermometer is one instrument that serves to determine the temperature of the object (object / body).

Digital thermometers work principle
Digital thermometer, usually using a thermocouple as a sensor to read the change in resistance value. Simply put the thermocouple in the form of two wires of different metals that end, only the tip alone, together (welded). The point of this union called the hot junction. The principle works utilize the characteristics of the relationship between the voltage (volts) with temperature. Each type of metal, at a given temperature has a certain tension as well. At the same temperature, metal A has a different voltage to the metal B, there was a voltage difference (very small, mili volts) which can be detected. So from the input temperature of the environment after passing through the thermocouple is detected as a difference voltage (volts). Voltage difference is then converted back to its current value by comparison with the reference value and offset value in the comparator, its function is to translate each unit in units of amperes to volts and then used as the temperature scale that is displayed through the screen / monitor in the form of seven segments that show the temperature detected by thermocouple .

These thermocouples vary, depending on the type of metals used. Metal type will determine the range of temperatures that can be measured (thermocouple temperature (low temperature) are different from thermocouples to measure temperature of the furnace fuel (high temperature)), as well as sensitivity.

The detailed working principle of digital thermometers can be explained as follows:
Sensory form of PTC or NTC with high sensitivity level will change the value of prisoners if there is a temperature severity of such a distinguished about it.
Change the value of this resistance changes linearly with current, so the value of these flows can be converted into plain view display

Before the conversion, this flow value in comparison with the reference value and offset value in the comparator, its function is to translate each unit in units of volt amperes to-be converted to display.

Readings Measurement Digital Thermometers
Reading of thermometer measurement is done directly from the display with respect to line segments.

Digital Thermometer Calibration
Regular calibration using manual or automatic calibrator, temperature calibrator manual which bears to the sensor is a real heater temperature from 0 degrees to setting this offset. Automatic calibration consists of heating temperature and checker for the gain in circuit this comparators.

Drafting Materials Digital Thermometer
Digital thermometer has a most important constituent part. Composition, are as follows:
* Sensor PTC / NTC
* Comparator (OP-amps and the like)
* Analog to digital converter
* Decoder displays (eg TTL IC 7447)
* Display (7 segment, LCD, monitors)