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Combustible gas detection apparatus enabling alarm threshold to be adjustable

A gas detection and threshold technology, applied in alarms, instruments, material resistance, etc., can solve the problems of poor flexibility and versatility, and the alarm threshold cannot be adjusted, and achieve the effect of strong versatility, simple structure and good flexibility

Inactive Publication Date: 2015-10-14
CHENGDU ETC CERTIFICATION GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The alarm threshold of the gas monitoring device in the prior art cannot be adjusted, and the flexibility and versatility are poor

Method used

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  • Combustible gas detection apparatus enabling alarm threshold to be adjustable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, the combustible gas detection device with adjustable alarm threshold includes a combustible gas detection circuit, an alarm circuit, and a concentration display circuit.

[0022] The combustible gas detection circuit includes a gas sensor QM, a variable resistor BP1 and a variable resistor BP2. The gas sensor QM has four electrodes, namely: heating electrode H, heating electrode H1, output electrode A, output electrode B, one of which is The heating electrode H, the heating electrode H1, the heating electrode H and the output electrode A are connected to the power supply VCC, the heating electrode H1 is grounded through the variable resistor BP1; the output electrode B is grounded through the variable resistor BP2. A variable resistor generally has two fixed ends and a movable contact. In this embodiment, one fixed end of the variable resistor BP1 is connected to the heating electrode H1, and the other fixed end and the movable contact are gro...

Embodiment 2

[0026] On the basis of Example 1, the concentration display circuit in this example is further improved:

[0027] Each concentration judgment display circuit also includes a current limiting resistor, through which the anode of the light emitting diode is connected to the power supply VCC.

Embodiment 3

[0029] On the basis of Example 2, the concentration display circuit includes a second voltage divider circuit and four concentration judgment display circuits, and the second voltage divider circuit is composed of voltage divider resistors R1, R2, R3, R4, and R5 connected in series , the voltage dividing resistor R1 is connected to the output terminal of the power supply circuit, and the voltage dividing resistor R5 is grounded. The second voltage dividing circuit has four output terminals in total, and the four output terminals are: the common terminal of R1 and R2, and the common terminal of R3 and R2 , the common terminal of R3 and R4, the common terminal of R4 and R5, these four output terminals are respectively connected to the positive input terminals of the voltage comparators of the four concentration judgment display circuits.

[0030] Further, the structures of the four concentration judgment display circuits are as follows:

[0031] The first concentration judgment ...

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Abstract

A combustible gas detection apparatus enabling an alarm threshold to be adjustable comprises a combustible gas detection circuit, an alarm circuit and a concentration display circuit. The alarm circuit includes a comparator U1, a first voltage division circuit providing the upper limit threshold of combustible gas concentration, a triode Q1, a current-limiting resistor R8, and a buzzer. The concentration display circuit includes a second voltage division circuit and N concentration determining and display circuit. Each concentration determining and display circuit includes a voltage comparator and a light emitting diode. The cathodes of the voltage comparators are all connected to the output end of the combustible gas detection circuit, and the anodes of the voltage comparators are connected to respective output ends of the second voltage division circuit. The output ends of the second voltage division circuit are connected to the light emitting diodes. The apparatus is capable of detecting and displaying the concentration of combustible gas, and also giving the alarm if the concentration of combustible gas exceeds an alarm threshold. The apparatus is safe and reliable, and the safety of gas monitoring is improved. The alarm threshold of the combustible gas detection apparatus can be adjusted on the basis of use needs so that the apparatus is suitable for different monitoring needs. Therefore, the apparatus exhibits great universality and flexibility.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to a combustible gas detection device with an adjustable alarm threshold. Background technique [0002] Combustible gas leakage mixed with air can easily cause explosion and fire. The leakage of combustible gas brings great safety hazards. It not only causes property loss at the fire site, but also easily threatens people's lives. For knowledge-intensive and service enterprises, property losses caused by fires and explosions are more serious, which may lead to the loss of various materials and documents. Therefore, the monitoring of combustible gas leakage is very important. [0003] At present, the main devices for monitoring gas leakage are mainly gas sensors. Gas sensors are also called "gas sensors". There are many types of them, which can be used to detect combustible and toxic gases. type, solid electrolyte type, electrochemical type, contact combustion type, polymer t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B21/16G01N27/12
CPCG08B21/16G01N27/12
Inventor 黄其
Owner CHENGDU ETC CERTIFICATION GRP CO LTD