KR20020078241A - Digital temperature control and recording meter - Google Patents

Abstract

PURPOSE: A digital thermal control/recording apparatus is provided to record continuously measured temperature data of a sensor by using a recording portion. CONSTITUTION: A sensor measuring portion(10) measure a low voltage thermoelectromotive force corresponding to a measured temperature. A thermoelectromotive force sense portion senses the low voltage thermoelectromotive force of the sensor measuring portion(10). An analog/digital conversion portion(30) amplifies the low voltage thermoelectromotive force to high voltage thermoelectromotive force and performs a pulse width modulation process for the high voltage thermoelectromotive force, and a serial port. A CPU(Central Processing Unit)(40) controls all operations of each element. An indication portion(50) is formed with a measured temperature indicator(51) and a temperature control indication portion(52). A recording portion(60) outputs continuously measured temperature data to a recording paper. A power supply portion is used for converting AC power to DC power and supplying the converted DC power to each element.

Description

DIGITAL TEMPERATURE CONTROL AND RECORDING METER}

The present invention relates to a digital temperature control / recorder, and more particularly, compares a target temperature set by a user with a measured temperature sensed by a sensor, and performs a control operation to reach a target temperature in a short time, and continuously measures the temperature. The present invention relates to a digital temperature control / recorder that can be viewed on site and remotely.

Conventional digital thermostats have been used exclusively for indication or control or recorders. Accordingly, there is a problem that a separate recorder must be additionally used in order to record the measurement temperature.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned general problems, and an object thereof is to provide a digital temperature control / recorder including a recorder for recording continuous data of the measured temperature detected by the sensor.

1 is a block diagram of a digital temperature control / recorder in accordance with the present invention.

2 is a circuit diagram of a digital temperature control / recorder according to the present invention.

<Description of main parts of drawing>

10: sensor measuring unit 20: thermoelectric power detecting unit

30: analog / digital converter 31: preamplifier

32: pulse width modulation signal section 33: serial port

40: central processing unit 50: indicator

51: measurement temperature indicator 52: temperature control indicator

60: recorder 70: power supply

Features of the digital temperature control / recorder according to the present invention for achieving the above technical problem,

The digital temperature controller includes a recorder which continuously outputs indication data of the measured temperature detected by the sensor measuring unit on a recording sheet.

In addition, the indication data of the measurement temperature output through the recording system and continuously output to the recording paper is output in a linear or text, wherein the transfer time of the recording paper output through the recording system can be set variable It features.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a digital temperature control / recorder according to the present invention, and FIG. 2 is a circuit diagram of a digital temperature control / recorder according to the present invention.

As shown, the digital temperature control / recording system according to the present invention is largely comprised of a sensor measuring unit 10, a thermoelectric power detecting unit 20, an analog / digital conversion unit 30, a central processing unit 40 and And an indicator 50, a recorder 60, and a power supply 70.

The sensor measuring unit 10 measures the thermoelectric power of the low voltage corresponding to the temperature measured by using the thermocouple as the temperature measuring unit, and the thermoelectric power detecting unit 20 measures the thermoelectric power of the low voltage measured from the sensor measuring unit 10. Detect.

The analog / digital converter 30 may include a preamplifier 31 for amplifying the low voltage thermoelectric power detected by the thermoelectric power detector 20 to a high voltage, and hot air amplified from the preamplifier 31. In order to convert the power analog signal into a digital signal, a pulse width modulated signal part 32 for converting it into a pulse width modulated signal and a serial port 33 are included.

The CPU 40 sets a target temperature to control a measurement temperature corresponding to the high-voltage thermoelectric power converted into a digital signal by the analog / digital converter 30 and inputs the target temperature. By comparing the target temperature, the on / off operation, proportional (P) operation, integral (I) operation, derivative (D) operation, proportional integration (PI) operation, proportional derivative (PD) operation, proportional integral derivative (PID) operation A control operation such as a fuzzy operation is performed. Also, a control signal is sent to the serial port 33 of the analog / digital converter 30 so as to be converted into a digital signal by the analog / digital converter 30 to correspond to the high voltage thermoelectric power input thereto. The temperature can be selected.

In addition, there are two alarm actions that perform two alarm output functions for abnormal operation of the instrument or as a sub contact point, and the two alarm actions are programmed to execute 20 (40 total) actions each. It is.

In addition, it obtains analog output value (4 ~ 20 [㎃], 1 ~ 5 [V]) proportional to the measured temperature indication value and transmits the signal to the third instrument to perform the analog output function which can be used as setting and indication. .

In addition, when several temperature control / recorders are installed in the field, the communication function is performed to check the current temperature and state by setting, changing, and observing the temperature with the personal computer in the office, instead of setting it in the field.

The indicating unit 50 receives the measured temperature measured by the sensor measuring unit 10 through the central processing unit 40 and displays the measured temperature indicating unit 51 by the light emitting diode, and the central processing unit 40. State according to the control operation performed by the CPU 40 by comparing the target temperature set from the measurement temperature with the measured temperature displayed by the measurement temperature indicating unit 51 (alarm state, output state, communication state, sensor short-circuit state). And a temperature control indicator 52 for displaying an output amount (%), a target temperature, etc.) through the light emitting diode.

The recorder 60 displays a measurement temperature, a target temperature, and a status display according to a corresponding control operation performed by the central processing unit 40 on the display unit 50, and simultaneously displays an indication of the measured temperature through a recording sheet. Output continuously.

In addition, the format output through the recording system 60 may be linear recording or text recording, and the transport time of the recording paper may be set to be variable from 24 mm / h to 900 mm / h.

In addition, on the recording paper of the recorder 60, in addition to the continuously measured temperature measurement value, information such as alarm state, year, month, day, hour, minute, second, sensor input open state, thermocouple type, and temperature scale is 20 cm. It is recorded each time it proceeds.

The power supply unit 70 receives an AC voltage of 100 to 240 [V], converts it into a DC voltage, and supplies the same to each element including the central processing unit 40.

The operation of the digital temperature control / recording system according to the present invention configured as described above will be described.

The thermoelectric power of the low voltage corresponding to the temperature measured by using the thermocouple as the temperature measuring part is measured by the sensor measuring part 10 and sensed by the thermoelectric power detecting part 20. The low voltage thermoelectric power sensed by the thermoelectric power detector 20 is input to the analog / digital converter 30 and amplified to a high voltage by the preamplifier 31. The analog signal corresponding to the high voltage thermoelectric power amplified by the preamplifier 31 is converted into a pulse width modulation signal by the pulse width modulation signal unit 32 and converted into a digital signal. The digital signal converted from the analog / digital converter 30 is input to the CPU 40. The CPU 40 sets a target temperature to control the measured temperature corresponding to the thermoelectric power of the high voltage converted into the digital signal, and compares the measured temperature with the target temperature to turn on / off an operation and proportion ( P) Control, Integral (I), Derivative (D), Proportional Integral (PI), Proportional (PD), Proportional Integral (PID), and Fuzzy operations . In this case, the CPU 40 sends a control signal to the serial port 33 of the analog / digital converter 30 to convert the digital signal into the digital signal by the analog / digital converter 30. Select the measured temperature corresponding to the thermoelectric power of.

Subsequently, a state (alarm state, output state, communication state, sensor short circuit state, output amount (%)) according to the measured temperature input to the central processing unit 40 and the control operation performed by the central processing unit 40, Target temperature, etc.) are displayed on the measurement temperature indicating section 51 and the temperature control indicating section 52 of the indicating section 50 through the light emitting diodes, respectively. At the same time, the measured temperature indication value is continuously output in the form of linear or text through the recording paper of the recorder 60.

In the above described and illustrated with respect to the preferred embodiment of the present invention, the present invention is not limited to the above-described embodiment, the general knowledge in the field of the present invention without departing from the gist of the invention claimed in the claims Anyone with a variety of modifications can be made, as well as such modifications are within the scope of the claims.

As described above, according to the present invention, by incorporating a recorder for recording continuous measurement temperature data into a measurement temperature control system sensed by a sensor, stable temperature control can be performed quickly and quickly regardless of time and place. It works.

Claims (3)

Digital including a sensor measuring unit 10, a thermoelectric power detecting unit 20, an analog / digital conversion unit 30, a central processing unit 40, the indicating unit 50, the power supply unit 70 In the thermostat, It includes a recorder 60 that is displayed on the indicator 50 by the control of the central processing unit 40, the indication data of the measured temperature sensed by the sensor measuring unit 10 and continuously output to the recording paper Digital temperature control / recorder. The method of claim 1, Digital temperature control / recorder, characterized in that the indication data of the measured temperature output through the recorder (60) and continuously output to the recording paper is output in linear or text. The method according to claim 1 or 2, Digital temperature control / recorder, characterized in that the transfer time of the recording paper output through the recorder 60 can be set variable.