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Range automatic switching circuit for fume concentration online monitoring system

A monitoring system and automatic switching technology, applied in the field of particle concentration research, can solve the problems of affecting measurement accuracy, single measurement range, and low resolution

Inactive Publication Date: 2010-02-24
中科天融(北京)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the wide range, the measurement accuracy is more accurate
Therefore, the measurement range is single and the resolution is low, which can no longer meet the needs of strict monitoring of particulate matter emitted by pollution sources.

Method used

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  • Range automatic switching circuit for fume concentration online monitoring system
  • Range automatic switching circuit for fume concentration online monitoring system

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Experimental program
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Effect test

Embodiment Construction

[0013] Depend on figure 1 It can be seen that an automatic range switching circuit of an online monitoring system for smoke and dust concentration is composed of a single-chip microcomputer PIC16F876A control signal (N1), a photoelectric coupler TLP521-1 (U1), a signal relay (TO-2), an analog amplifier chip LF256 (U2), and an analog The amplification chip AD622 (U3) is composed, and the single-chip microcomputer PIC16F876A collects the A / D output signal V 0 , through the software algorithm to determine whether to switch the range, if it is necessary to switch the range, give the control signal N1, change the on-off state of the signal relay (TO-2) through the photocoupler TLP521-1 (U1), and change the analog amplifier chip AD622 (U3 ) to an external amplifier resistor, and change the output of the analog amplifier chip LF256 (U2) by adjusting the sliding rheostat (W1), thereby adjusting the output voltage value of the circuit.

[0014] Its working process is as follows:

[0...

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Abstract

A range automatic switching circuit for a fume concentration online monitoring system comprises a singlechip PIC 16F876A for providing a control signal (N1), a photocoupler TLP521-1(U1), a signal relay(TO-2), an analog amplification chip LF256(U2), an analog amplification chip AD622(U3), characterized in that the singlechip collects A / D output signal, determines whether to switch range according to software algorithm, provides the control signal N1, changes switch on or off of the signal relay(TO-2) through the photocoupler TLP521-1(U1), changes an external amplification resistor of the analogamplification chip AD622(U3), and changes output of the analog amplification chip LF256(U2) through regulating a slide rheostat(W1), therefore the output voltage value of the circuit is regulated. The invention has the beneficial effect that the PIC singlechip can automatically determine whether the range is necessary to modify according to the input signal, can automatically switch the range without additional manual operation, and is applicable for the range automatic switching circuit of the fume concentration online monitoring system.

Description

technical field [0001] The invention belongs to the technical field of particle concentration research, in particular to an analog circuit design for automatic adjustment of range magnification for on-line monitoring of smoke concentration. When it is used in the online monitoring of smoke and dust in the environmental protection industry, it is necessary to adjust the magnification and automatically switch the range of the instrument. Background technique [0002] At present, most of the on-line monitoring smoke meters in the environmental protection industry can only set one range, and the corresponding preamplifier circuit has only one magnification factor. Although the measuring range of the instrument is relatively large, the resolution is low and the accuracy is not enough. For the site where the smoke concentration is low and relatively stable, small changes in the smoke concentration will not have an accurate measurement response in the measuring instrument, which wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06G05B19/042G05B19/048
Inventor 王昕竑郭炜冯倩李同彩
Owner 中科天融(北京)科技有限公司
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