CN202167172U - Substance conductivity testing pen - Google Patents
Substance conductivity testing pen Download PDFInfo
- Publication number
- CN202167172U CN202167172U CN2011200869019U CN201120086901U CN202167172U CN 202167172 U CN202167172 U CN 202167172U CN 2011200869019 U CN2011200869019 U CN 2011200869019U CN 201120086901 U CN201120086901 U CN 201120086901U CN 202167172 U CN202167172 U CN 202167172U
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- substance
- light emitting
- emitting diodes
- conductive capability
- penholder
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Abstract
The utility model relates to a substance conductivity testing pen which is small, portable and simple and convenient in operation, saves medicine and energy, and guarantees that all the students in a classroom can feel conductivity capability of a substance. In a plastic penholder, a transistor amplification circuit board formed by four triodes is connected with a battery case, two titanium electrodes at the tip of the pen are serially connected with a debugging resistor via a to-be-measured substance to form an upper bias resistor of the two-level transistor amplification circuit, and four light emitting diodes on the penholder serve as four triode collector loads. The substance conductivity testing pen is mainly used in middle school chemical teaching for experiments of conductivity of substances and conductive capability comparison of electrolyte solutions. In experiments, if none of the four light emitting diodes glows, then the substance is not conductive; if one of the four light emitting diodes glows, then conductive capability of the substance is very weak; if two of the four light emitting diodes glow, then conductive capability of the substance is relatively weak; if three of the four light emitting diodes glow, then conductive capability of the substance is relatively strong; and if all the four light emitting diodes glow, then conductive capability of the substance is very strong.
Description
Technical field
The utility model relates to a kind of instrument of walk through test substance conductance sexuality, especially is convenient in the high school chemistry teaching electric conductivity of the material that makes an experiment and the relatively conductive capability experiment of electrolyte solution.
Background technology
At present, just, in the Chemistry Teaching of Senior High School, the method that is used to test liquid substance conductance property mainly contains two kinds, and a kind of method is to use 220 volts alternating currents to make power supply, carbon-point and makes the device that electrode, bulb are made demonstration, small beaker splendid attire testing liquid.During use, fill the insertion of two carbon electrodes in the small beaker of testing liquid, CC, energized, whether luminous and luminous power differentiates whether liquid conducts electricity and the power of electric conductivity ability according to bulb then.Make and have following problem in this way: the first, potential safety hazard is arranged, possibly cause electric shock accidents; The second, the equipment volume is big, carries inconvenience, and operation is trouble also; The 3rd, the testing liquid consumption is big, causes medicine waste and environmental pollution; The 4th, show that with the luminous bright degree of bulb substance conductance property is strong and weak, display effect is poor.Another kind method is to replace 220 volts of alternating currents with dry cell or low-voltage DC to make power supply, and this method has only solved safety problem, because polarization of electrode is serious, can not compare the electric conductivity ability of fluent meterial well simultaneously.
Summary of the invention
Test the deficiency of the big and display effect difference of the potential safety hazard, troublesome poeration, the drug dosage that exist in the method for liquid substance conductance property in order to overcome existing high school chemistry teaching; The utility model provides a kind of substance conductance property testing pen; This test pen is made power supply with button cell, and is safe in utilization; Volume is little, and is easy to carry, easy and simple to handle; Testing liquid only needs several, practices thrift medicine and has also reduced pollution; Use many high bright light emitting diodes to show, energy-conservation, highly sensitive, brightness is big, visual range is wide, substance conductance property is strong and weak show clearly demarcated; Adopt special electronic circuit, reduced the influence of electrode polarization test.
The utility model solves the technical scheme that its technical matters adopted: in plastic penholder, electronic circuit board is installed is connected with battery case, the nib place loads onto two titanium electrodes and is connected with circuit board, and four light emitting diodes in penholder middle part are connected with circuit board.Independently a transistor amplifier circuit and the three grades of transistor amplifier circuits of direct coupled type through emitter output are arranged on the electronic circuit board; Four transistorized collector loads are the light emitting diode that is installed on the penholder; A titanium electrode at nib place is received on first and second transistorized base stage through a debugging resistance respectively and is connected as these two transistorized upper offset resistance with test substance.When two electrodes at nib place contact with measured matter; In the circuit first and second triode are equivalent to insert upper offset resistance provides bias current to triode, and whether conducting is luminous for the light emitting diode that the size of this electric current has determined to link to each other with collector.When the substance conductance ability was very weak, the light emitting diode conducting of having only first transistor collector to insert was luminous; When the substance conductance ability was more weak, also conducting was luminous for the light emitting diode of second transistor collector access; When the conductive capability of material was strong, the pressure drop that obtains on the emitter resistance of second triode causes light emitting diode that the 3rd transistor collector insert, and also conducting was luminous; When the substance conductance ability was stronger, in like manner, also conducting was luminous for the light emitting diode of the 4th transistor collector access.According to the luminous situation of four light emitting diodes on the penholder just can differentiate roughly material conductive capability (non-conductive, conductive capability very a little less than, conductive capability a little less than, conductive capability is stronger, conductive capability is very strong).
The beneficial effect of the utility model is; Experimental apparatus as high school chemistry teaching; Electric conductivity that is used for substances and the relatively conductive capability experiment of electrolyte solution, instrument is easy to carry, safe in utilization, easy and simple to handle, practice thrift medicine, energy savings, highly sensitive, visual range wide, substance conductance property strong and weak show clearly demarcated.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Fig. 1 is the circuit theory diagrams of the utility model.
Fig. 2 is the audio-visual picture of substance conductance property testing pen.
Fig. 3 is the longitudinal profile structural map of a substance conductance property testing embodiment.
1. penholders among the figure, 2. nib, 3. a tail-hood, 4. titanium electrode, 5. electronic circuit board, 6. battery case, 7. battery, 8. lead, 9. spring, 10. light emitting diode.
Embodiment
In Fig. 1, light emitting diode (10) is installed in penholder (1) and upward is connected with electronic circuit board (5), and the remaining circuit element is installed on the electronic circuit board (5).
In Fig. 3, electronic circuit board (5) one ends are connected with battery case (6), and the other end is connected with titanium electrode (4) through lead (8); Titanium electrode (4) is fixed on the nib (2), and nib (2) adopts to insert with penholder (1) and is connected; Battery (7) is contained in the battery case (8), and is in addition fastening with the spring (9) on a tail-hood (3).
Claims (2)
1. substance conductance property testing pen; Be connected through measured matter by power supply, display lamp, test electrode; It is characterized in that: independently a transistor amplifier circuit and the three grades of transistor amplifier circuits of direct coupled type through emitter output are installed in plastic penholder; Make four transistorized collector loads respectively with four light emitting diodes, be together in series test substance and debugging resistance as transistorized upper offset resistance.
2. substance conductance property testing pen according to claim 1 is characterized in that: four pieces of button cells are contained in the built-in battery case of plastic penholder, and battery case is connected with electronic circuit board; Independently a transistor amplifier circuit and the three grades of transistor amplifier circuits of direct coupled type through emitter output are arranged on the electronic circuit board; Four transistorized collector loads are the light emitting diode that is installed on the penholder; A titanium electrode at nib place is received on first and second transistorized base stage through a debugging resistance respectively and is connected as these two transistorized upper offset resistance with test substance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200869019U CN202167172U (en) | 2011-03-21 | 2011-03-21 | Substance conductivity testing pen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200869019U CN202167172U (en) | 2011-03-21 | 2011-03-21 | Substance conductivity testing pen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202167172U true CN202167172U (en) | 2012-03-14 |
Family
ID=45802984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200869019U Expired - Fee Related CN202167172U (en) | 2011-03-21 | 2011-03-21 | Substance conductivity testing pen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202167172U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106652685A (en) * | 2015-11-03 | 2017-05-10 | 重庆尊来科技有限责任公司 | Stepped type conductivity teaching demonstration device for operational amplifier controlling |
| CN106683545A (en) * | 2015-11-10 | 2017-05-17 | 重庆尊来科技有限责任公司 | Display teaching demonstration instrument capable of testing positive and negative electricity |
| CN106683546A (en) * | 2015-11-10 | 2017-05-17 | 重庆尊来科技有限责任公司 | Positive and negative thirst for knowledge teaching demonstration instrument |
| CN106683544A (en) * | 2015-11-06 | 2017-05-17 | 重庆尊来科技有限责任公司 | Discrete conductivity macroscopic display teaching demonstration instrument |
-
2011
- 2011-03-21 CN CN2011200869019U patent/CN202167172U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106652685A (en) * | 2015-11-03 | 2017-05-10 | 重庆尊来科技有限责任公司 | Stepped type conductivity teaching demonstration device for operational amplifier controlling |
| CN106683544A (en) * | 2015-11-06 | 2017-05-17 | 重庆尊来科技有限责任公司 | Discrete conductivity macroscopic display teaching demonstration instrument |
| CN106683545A (en) * | 2015-11-10 | 2017-05-17 | 重庆尊来科技有限责任公司 | Display teaching demonstration instrument capable of testing positive and negative electricity |
| CN106683546A (en) * | 2015-11-10 | 2017-05-17 | 重庆尊来科技有限责任公司 | Positive and negative thirst for knowledge teaching demonstration instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120314 Termination date: 20130321 |