CN202230051U - Handheld formaldehyde detector - Google Patents

Handheld formaldehyde detector Download PDF

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Publication number
CN202230051U
CN202230051U CN2011203785231U CN201120378523U CN202230051U CN 202230051 U CN202230051 U CN 202230051U CN 2011203785231 U CN2011203785231 U CN 2011203785231U CN 201120378523 U CN201120378523 U CN 201120378523U CN 202230051 U CN202230051 U CN 202230051U
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CN
China
Prior art keywords
circuit
sensor
detector
control circuit
display screen
Prior art date
Application number
CN2011203785231U
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Chinese (zh)
Inventor
李峰
崔连涛
宋延明
Original Assignee
青岛职业技术学院
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Application filed by 青岛职业技术学院 filed Critical 青岛职业技术学院
Priority to CN2011203785231U priority Critical patent/CN202230051U/en
Application granted granted Critical
Publication of CN202230051U publication Critical patent/CN202230051U/en

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Abstract

The utility model relates to a handheld formaldehyde detector, which comprises a shell, wherein the shell is provided with an air inlet, a sensor, a display screen and a power switch, the shell is internally provided with a power supply and a control circuit, the sensor, the display screen, the power switch and the control circuit are electrically connected with the power supply, the control circuit comprises a microprocessor, an amplifying circuit, an I/V (Current/Voltage) switching circuit, an A/D (Analog/Digital) switching circuit and a ZigBee communication module, and the sensor is an electrochemical sensor and has the advantages of stable performance, good linearity, short polarization time, strong interference resisting capacity and long service life. The detected formaldehyde concentration value can be automatically displayed on a screen by the detector, so that the reading is accurate, and the response is sensitive; the detector is internally embedded with the ZigBee wireless communication module, so that the wireless network control and communication can be realized, and the detector can realize the real-time transmission and share with a local area network; and when the formaldehyde concentration value in the air exceeds a threshold value, the detector can give out an alarm by an inner-arranged alarming circuit arranged in the detector, so that operators are prompted to carry out corresponding safe operation.

Description

The hand-held methylene oxide detecting instrument

Technical field

The utility model relates to a kind of methylene oxide detecting instrument, belongs to electronic technology field.

Background technology

Formaldehyde is a kind of colourless gas with high volatile volatile and intense stimulus property smell, also is a kind of potential carcinogen, and health is had bigger harm, and bringing out like asthma, leukaemia etc. of numerous disease is all relevant with formaldehyde.The World Health Organization (WHO) and USEPA (EPA) all classify them as potential danger carcinogenic substance and important environmental contaminants.Along with various novel building materialss, the utilization of decorating and renovating material, cause the indoor environmental pollution problem serious day by day in recent years, content of formaldehyde is excessive in the especially various materials, directly is detrimental to health.Concentration of formaldehyde reaches 0.06-0.07mg/m in every cubic metres of air 3The time, slight asthma will take place in children; When formaldehyde in indoor air content is 0.1mg/m 3The time, peculiar smell and sense of discomfort are just arranged; Reach 0.5mg/m 3The time, can stimulate eyes to cause and shed tears.

At present, in the conventional formaldehyde on-the-spot test method, AAS is limit by operating conditionss such as the water-bath or the concentrated sulphuric acid, and chromatography is limit by instrument and equipment.The raising day by day of Along with people's living standard, people need a kind of simple, sensitive, hand-held methylene oxide detecting instrument fast and accurately.

The utility model content

The problem that the utility model will solve is to above deficiency, provide a kind of highly sensitive, measuring speed is fast, uses simple hand-held methylene oxide detecting instrument.

For overcoming the above problems; The utility model adopts following technical scheme: the hand-held methylene oxide detecting instrument; Comprise housing; It is characterized in that: housing is provided with air intake opening, sensor, display screen and power switch, is provided with power supply and control circuit in the housing, and sensor, display screen, power switch, control circuit are electrically connected with power supply.

Further improvement as technique scheme:

Said control circuit comprises microprocessor, amplifying circuit, I/V change-over circuit, A/D change-over circuit and the ZigBee communication module of electrical connection;

Amplifying circuit is connected with sensor, is used for current signal that sensor is surveyed is amplified;

The I/V change-over circuit is connected with amplifying circuit, is used for converting the current signal after amplifying into voltage signal;

The A/D change-over circuit is connected with the I/V change-over circuit, is used for converting analog voltage signal into digital voltage signal;

Microprocessor is connected with the A/D change-over circuit, and the reception digital voltage signal is also handled, and exports the gas concentration value information after handling to display screen and ZigBee communication module;

The ZigBee communication module is connected with microprocessor, is used for the gas concentration value information is carried out wireless transmission.

Said control circuit comprises warning circuit, and warning circuit is connected with microprocessor.

Be provided with fan in the said housing, fan is electrically connected with power switch, power supply.

Said power supply is a rechargeable battery, and rechargeable battery is through power switch wind-receiving fan and mu balanced circuit, and mu balanced circuit is that sensor, display screen and control circuit provide working power.

Said sensor is an electrochemical sensor.

After the utility model adopts above technical scheme, compared with prior art, have the following advantages: adopt Ni-Cd nickel-cadmium, in light weight, improved the energy saving and the portability of product; Sensor adopts electrochemical sensor, the advantage that have stable performance, the linearity is good, the polarization time is short, antijamming capability is strong, the life-span is long; Detector can be presented at detected concentration of formaldehyde value on the screen automatically in real time, reading precisely, be quick on the draw; The embedded ZigBee wireless communication module of detector can be realized wireless network control and communication, can realize real-time Transmission and share with LAN; When air formaldehyde concentration surpassed threshold value, detector can utilize its built-in warning circuit to give the alarm, and alert is in time carried out corresponding safe operation.

Multi-functional hand-held formula methylene oxide detecting instrument can be applicable to new household; Content of formaldehyde in the room air is monitored in real time, is reported to the police and shows; The content of formaldehyde that also can be applicable to industry and enterprises such as petrochemical industry, coal, mine, subsurface investigation detects, and has higher using value and dissemination.

Below in conjunction with accompanying drawing and embodiment the utility model is elaborated.

Description of drawings

Accompanying drawing 1 is the structural representation of hand-held methylene oxide detecting instrument among the utility model embodiment;

Accompanying drawing 2 is circuit block diagrams of hand-held methylene oxide detecting instrument among the utility model embodiment;

Among the figure,

1-housing, 2-air intake opening, 3-sensor, 4-display screen, 5-power switch, the 6-socket that charges, 7-fan, 8-rechargeable battery.

Embodiment

Embodiment, like Fig. 1, shown in Figure 2, the hand-held methylene oxide detecting instrument; Comprise housing 1; Housing 1 is provided with air intake opening 2, sensor 3, display screen 4, power switch 5 and charging socket 6, is provided with power supply, fan 7 and control circuit in the housing 1, is provided with fan 7 in the housing 1; Make detected gas inside and outside detector, form a gas circulation; The balanced gas density of gas makes its measurement data more true and reliable, and sensor 3, display screen 4, power switch 5, fan 7 and control circuit are electrically connected with power supply;

Control circuit comprises microprocessor, amplifying circuit, I/V change-over circuit, A/D change-over circuit, warning circuit and the ZigBee communication module of electrical connection;

Amplifying circuit is connected with sensor 3, is used for sensor 3 current signal of surveying is amplified;

The I/V change-over circuit is connected with amplifying circuit, is used for converting the current signal after amplifying into voltage signal;

The A/D change-over circuit is connected with the I/V change-over circuit, is used for converting analog voltage signal into digital voltage signal;

Microprocessor, the reception digital voltage signal is also handled, and exports the gas concentration value information after handling to display screen and ZigBee communication module;

Warning circuit is connected with microprocessor, when gas concentration value surpasses threshold value, gives the alarm;

The ZigBee communication module is used for the gas concentration value information is carried out wireless transmission.

Power supply is a rechargeable battery 8, and rechargeable battery 8 is through power switch 5 wind-receiving fan 7 and mu balanced circuits, and mu balanced circuit is that sensor 3, display screen 4 and control circuit provide working power.Charge through 6 pairs of rechargeable batteries 8 of charging socket.

Microprocessor adopts the Mega8L single-chip microcomputer, and display screen 4 adopts the OMC12964-9 dot lcd to show, can realize data acquisition and demonstration more accurately; Power supply has been abandoned the power supply mode of the AC220V that existing product used on the market, power 5*2.5W; Adopt Ni-Cd nickel-cadmium; With the WV mode of DC 5V, power 0.5W, weight is relieved to 300-500g by common 1.5kg, has improved the energy saving and the portability of product; Sensor 3 adopts electrochemical sensor, and electrochemical sensor adopts CONTROLLED POTENTIAL electrolytic process principle, and its structure is in electrolytic cell, to settle three electrodes; Be working electrode, to electrode and contrast electrode, and impose certain polarizing voltage, separate with the external world with film; This film of tested gas permeation that gets into from air intake opening 2 arrives working electrode; Redox reaction takes place, and electrochemical sensor will have an output current this moment, and this electric current and tested gas concentration are proportional.

Embedded ZigBee wireless communication module makes the detection data realize real-time Transmission and to share that the habitual data line transmission mode of like product has had bigger improvement relatively, has possessed stronger expanded function and communication function with LAN.

When air formaldehyde concentration surpassed threshold value, detector can utilize its built-in warning circuit to give the alarm, and alert is in time carried out corresponding safe operation.

The sensing element that the hand-held methylene oxide detecting instrument adopts is present popular in the world electrochemical sensor, has plurality of advantages such as stable performance, the linearity is good, the polarization time is short, antijamming capability is strong, the life-span is long.

Near method of application: operate in strict accordance with prompting, select to detect per 10~15m the poisonous gas leakage point 2Should detect at least once, will consider factors such as room ventilation and house inner structure simultaneously.

Points for attention:

(1) power supply that uses of detector is four joint Ni-Cd nickel-cadmiums, time spent not for a long time, every at a distance from the first quarter moon charging once.

(2) the sensor probe is wanted periodic cleaning, otherwise dust impurity stops up air intake opening transducer sensitivity is descended.

(3) user does not dismantle the inner components and parts of detector voluntarily, especially notes not making it produce strenuous vibration.

(4) forbid detector is placed on the inflammable gas gathering and has hazardous area.

Claims (6)

1. hand-held methylene oxide detecting instrument; Comprise housing (1); It is characterized in that: housing (1) is provided with air intake opening (2), sensor (3), display screen (4) and power switch (5); Housing is provided with power supply and control circuit in (1), and sensor (3), display screen (4), power switch (5), control circuit are electrically connected with power supply.
2. hand-held methylene oxide detecting instrument as claimed in claim 1 is characterized in that: said control circuit comprises microprocessor, amplifying circuit, I/V change-over circuit, A/D change-over circuit and the ZigBee communication module of electrical connection;
Amplifying circuit is connected with sensor (3), is used for sensor (3) current signal of surveying is amplified;
The I/V change-over circuit is connected with amplifying circuit, is used for converting the current signal after amplifying into voltage signal;
The A/D change-over circuit is connected with the I/V change-over circuit, is used for converting analog voltage signal into digital voltage signal;
Microprocessor is connected with the A/D change-over circuit, and the reception digital voltage signal is also handled, and exports the gas concentration value information after handling to display screen and ZigBee communication module;
The ZigBee communication module is connected with microprocessor, is used for the gas concentration value information is carried out wireless transmission.
3. hand-held methylene oxide detecting instrument as claimed in claim 2 is characterized in that: said control circuit comprises warning circuit, and warning circuit is connected with microprocessor.
4. hand-held methylene oxide detecting instrument as claimed in claim 3 is characterized in that: be provided with fan (7) in the said housing (1), fan (7) is electrically connected with power switch (5), power supply.
5. hand-held methylene oxide detecting instrument as claimed in claim 4; It is characterized in that: said power supply is rechargeable battery (8); Rechargeable battery (8) is through power switch (5) wind-receiving fan (7) and mu balanced circuit, and mu balanced circuit is that sensor (3), display screen (4) and control circuit provide working power.
6. like one of them described hand-held methylene oxide detecting instrument of claim 1-5, it is characterized in that: said sensor (3) is an electrochemical sensor.
CN2011203785231U 2011-09-28 2011-09-28 Handheld formaldehyde detector CN202230051U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011203785231U CN202230051U (en) 2011-09-28 2011-09-28 Handheld formaldehyde detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011203785231U CN202230051U (en) 2011-09-28 2011-09-28 Handheld formaldehyde detector

Publications (1)

Publication Number Publication Date
CN202230051U true CN202230051U (en) 2012-05-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011203785231U CN202230051U (en) 2011-09-28 2011-09-28 Handheld formaldehyde detector

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Country Link
CN (1) CN202230051U (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103336038A (en) * 2013-06-03 2013-10-02 陆和平 Portable formaldehyde detection instrument
CN103344680A (en) * 2013-06-18 2013-10-09 黄俊晶 Formaldehyde monitor
CN103364462A (en) * 2013-06-18 2013-10-23 毛雪斌 Portable formaldehyde detector
CN104678057A (en) * 2014-06-30 2015-06-03 深圳市睿海智电子科技有限公司 Air quality monitoring method, and corresponding equipment and system
CN105866340A (en) * 2016-05-05 2016-08-17 杨志恒 Environment detector for flower cultivation
CN106805305A (en) * 2015-11-30 2017-06-09 衡阳腾飞内衣有限公司 A kind of concentration of formaldehyde detects underwear
CN107525830A (en) * 2017-09-01 2017-12-29 深圳小气科技有限公司 Air quality detector
CN107677770A (en) * 2017-09-06 2018-02-09 安徽乐金环境科技有限公司 Hand-held formaldehyde test device
CN107860105A (en) * 2017-10-19 2018-03-30 广东美的制冷设备有限公司 Sensor module and there is its air conditioner

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103336038A (en) * 2013-06-03 2013-10-02 陆和平 Portable formaldehyde detection instrument
CN103344680A (en) * 2013-06-18 2013-10-09 黄俊晶 Formaldehyde monitor
CN103364462A (en) * 2013-06-18 2013-10-23 毛雪斌 Portable formaldehyde detector
CN104678057A (en) * 2014-06-30 2015-06-03 深圳市睿海智电子科技有限公司 Air quality monitoring method, and corresponding equipment and system
CN106805305A (en) * 2015-11-30 2017-06-09 衡阳腾飞内衣有限公司 A kind of concentration of formaldehyde detects underwear
CN105866340A (en) * 2016-05-05 2016-08-17 杨志恒 Environment detector for flower cultivation
CN107525830A (en) * 2017-09-01 2017-12-29 深圳小气科技有限公司 Air quality detector
CN107677770A (en) * 2017-09-06 2018-02-09 安徽乐金环境科技有限公司 Hand-held formaldehyde test device
CN107860105A (en) * 2017-10-19 2018-03-30 广东美的制冷设备有限公司 Sensor module and there is its air conditioner

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C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120523

Termination date: 20140928

EXPY Termination of patent right or utility model