CN86200819U - Capacitance rapid moisture apparatus - Google Patents
Capacitance rapid moisture apparatus Download PDFInfo
- Publication number
- CN86200819U CN86200819U CN 86200819 CN86200819U CN86200819U CN 86200819 U CN86200819 U CN 86200819U CN 86200819 CN86200819 CN 86200819 CN 86200819 U CN86200819 U CN 86200819U CN 86200819 U CN86200819 U CN 86200819U
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- sensor
- bridge
- moisture teller
- circuit
- moisture
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Abstract
The utility model relates to a capacitance rapid moisture apparatus, composed of a measuring circuit in which an LC bridge type oscillatory circuit is main body, a display circuit and a sensor composed of probes and an outer metal pipe. The outer metal pipe is covered with an insulating layer and has internal and external double shields. The utility model which can be used for the laboratory determination and the sampling detection in a production field has the advantages of light weight and small size. If the sensor is inserted into test specimens, the numerical value of moisture content can be read directly and the measurement precision is (+/-) 0.3%. The instrument can be used for the determination of the moisture content of the powdery, granular and insolubility solid, liquids, the two-phase system of liquor solid or liquor, etc., like raw materials for paper making, raw materials for textiles, raw materials for building, farm and sideline products, oils, etc.
Description
The utility model belongs to field of analytic instrument.
The utility model is a kind of analyzer for physical property of water content that can the fast measuring material.This instrument is applicable to the moisture of measuring various granules and flour and fluent meterial.
The condenser type moisture teller is made up of sensor, metering circuit and display circuit three parts.
Poor, the problems such as noise jamming is excessive, influence of temperature change measuring accuracy of existing condenser type moisture teller ubiquity sensor resolution.The condenser type moisture teller that has has adopted shielding measure, has reduced the influence of noise jamming, but causes that distributed capacitance increases, and transducer sensitivity is descended.
China Machine Press's in June, 1985 version " analyzer for physical property " book (according to scientific and technical literature publishing house " analytical instrument digest " digest numbers 853340) is pointed out when introducing the condenser type Moisture Meter: there are some shortcomings in capacitance type sensor.The distributed capacitance at existing capacitance type sensor edge and the distributed capacitance of stube cable not only can not be ignored the influence of measuring accuracy, and are difficult for overcoming.In addition, the probe of sensor is easy to wear.
The purpose of this utility model will provide a kind of resolution height, noise jamming is little, highly sensitive, distributed capacitance is little, probe is wear-resistant, volume is little, easy to use moisture teller exactly.
The purpose of this utility model is finished in the following way: the LC oscillator is at the secondary generation 80KHE50V alternating voltage of bridge circuit transformer, and this voltage is added in respectively on sensor and the balancing capacitance, and bridge circuit transformer center tap is connected with display gauge head.
The probe of sensor and metal outer pipe constitute capacitor, and measured matter is the medium between capacitor the two poles of the earth.On metal outer pipe, follow external shielding layer, reduce ambient noise, Electromagnetic Interference.Taked inner screening again on the lead that connects probe, internal shield is connected with bridge circuit transformer center tap, because output signal is very little, can be considered as and the ground equipotential, and this measure has reduced distributed capacitance greatly, has improved sensitivity.
On the outer wall of metal outer pipe, insulation course is arranged again, got rid of of the influence of the resistance of measured object contained humidity generation to circuit, make metering circuit keep good linear relationship, improved measuring accuracy.And the function that has the protection probe to be difficult for being worn.
Because the specific inductive capacity of water is very sensitive for temperature variation, the utility model is provided with the element of revising temperature effect, to adapt to the measurement under the different temperatures, guarantees measuring accuracy.
This instrument does not need during measurement the sampling weighing owing to adopted highly sensitive sensor, and is easy to operate.This instrument has good resolution characteristic and linear relationship, so measurable moisture wide ranges, precision height.
Display gauge head can be the digital wash head, so that direct-reading also can be used other gauge outfit.
This instrument also can be used for other binary systems except that being used for measuring the water percentage of solid, as systems such as liquid liquid, gas-liquid, gas-solids.
This instrument volume is very little, belongs to pocketly, both can be used for the laboratory and has done accurately to measure, and can carry again, does random test in suitability for industrialized production.
Accompanying drawing has been described an embodiment of the present utility model.
Fig. 1 is the quick moisture teller sensor of a condenser type sectional structure chart.Fig. 2 is the utility model circuit diagram.
Sensor is connected with the moisture teller circuit by one section three-core conductor, its front end is probe (1), the lead that connects probe (1) is successively cladding core insulation layer (7), internal shield (6) and inner insulating layer (5) for probe heart yearn (10) on the probe heart yearn (10) from inside to outside.In inner insulating layer (5) outside is metal outer pipe (4), and outer tube wall insulation course (3) is arranged on the outer wall of metal outer pipe (4) again, and the insulation course of present embodiment (3) adopts enamel.
Probe (1) is with sealing the encapsulation of (2) and outer metal tube (4) one ends.
External shielding layer (14) is connected with metal outer pipe (4), is cladding external insulation layer (13) on external shielding layer (14).
Probe (1) is according to the requirement of different measuring object, can make the hollow or solid of different geometries such as needle-like, bar-shaped, taper.
Two transistors (16) are formed pusb pull oscilator among Fig. 2, and with bridge circuit transformer (19) coupling, bridge circuit transformer (19) is formed the LC oscillator with electric capacity (20), output 80KHE50V alternating voltage, and electric capacity (23) is the building-out capacitor of sensor (15).The internal shield of sensor (6) is connected with bridge circuit transformer center tap (25) by internal shield exit (11).Two pole pieces of sensor (15) are connected with probe heart yearn (10) with external shield exit (12).
When the tested material water percentage changes, when causing sensor (15) electric capacitance change, export corresponding alternating voltage, through two diodes (27) rectification input liquid crystal display gauge outfit (28) by bridge circuit transformer (19).
Tap switch (18) is in order to revise the influence that temperature produces by adjusting resistance.
Potentiometer (17) and electric capacity (21) are formed the power supply correcting circuit, when supply voltage descends within the specific limits, make stable operating voltage in the permissible value scope by adjusting potentiometer (17).
Electric capacity (22) is linear compensation electric capacity.By adjusting the capacity of electric capacity (22), guarantee measuring accuracy.
Form adjustable resistance by switch (31) and resistance (32), this instrument can be adapted to measure the different material water percentage.
Bridge circuit transformer (19) and the secondary element that connects thereof are all shielded, and shielding termination bridge circuit transformer (19) secondary centre tap (25) is to reduce distributed capacitance.
Present embodiment adopts the 9V powered battery.
All elements all adopt miniaturized component, so volume is little, are easy to carry. Certainty of measurement is ± 0.3%.
The utility model can be used for the measurement of water-content coefficient of the binary systems such as powdery, the non-dissolubility solid of graininess, liquid and liquid solid, liquid liquid, measures such as the water content of paper making raw material, textile raw material, construction material, agricultural byproducts and oils etc.
Claims (7)
1, the quick moisture teller of a kind of condenser type, it is made up of a sensor (15), LC bridge-type oscillation measurement circuit (30) and display circuit (28), it is characterized in that a. sensor (15) is made of probe (1), metal outer pipe (4), internal shield (6), external shielding layer (14) and outer tube wall insulation course (3); B.LC bridge-type oscillation measurement circuit has linear compensation and revises the element of temperature effect.
2, moisture teller according to claim 1 is characterized in that on outer metal tube (4) outer wall of sensor (15) outer tube wall insulation course (3) being arranged again.
3, moisture teller according to claim 1 is characterized in that the double layer screen that sensor (15) has adopted internal shield (6) and external shielding layer (14) to form.
4, moisture teller according to claim 1, the probe that it is characterized in that sensor (15) can be the hollow or solids of different geometries such as needle-like, bar-shaped, taper.
5, moisture teller according to claim 1 is characterized in that in the LC bridge-type oscillation measurement circuit linear compensating element, electric capacity (22) being arranged.
6, moisture teller according to claim 1 is characterized in that LC bridge-type oscillation measurement circuit has tap switch (18) and the resistance (29) of revising temperature effect.
7,, it is characterized in that the element shielding back that is connected with bridge circuit transformer (19) in the LC bridge-type oscillation measurement circuit is connected with bridge circuit transformer (19) center tap according to claim 5,6 described moisture tellers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86200819 CN86200819U (en) | 1986-02-22 | 1986-02-22 | Capacitance rapid moisture apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86200819 CN86200819U (en) | 1986-02-22 | 1986-02-22 | Capacitance rapid moisture apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86200819U true CN86200819U (en) | 1987-06-10 |
Family
ID=4804735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86200819 Expired - Lifetime CN86200819U (en) | 1986-02-22 | 1986-02-22 | Capacitance rapid moisture apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86200819U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7028568B2 (en) | 2002-12-18 | 2006-04-18 | Denso Corporation | Sensor having resin mold casing and method of manufacturing the same |
| CN100401046C (en) * | 2005-11-10 | 2008-07-09 | 上海港复兴船务公司 | Water content of lub oil analyzer for towboat rudder propeller |
| CN102012387A (en) * | 2010-09-28 | 2011-04-13 | 西安交通大学 | Lubricant oil trace moisture sensor probe and online monitoring method |
| CN102023201A (en) * | 2010-11-09 | 2011-04-20 | 西南交通大学 | Method for testing time constant of change of water content in insulation paper of oil immersed type power equipment |
| CN101173974B (en) * | 2006-06-30 | 2011-04-27 | 韩国电力公社 | Apparatus and method of water absorption test for generator stator winding insulator using cross capacitance |
| CN101182770B (en) * | 2007-12-27 | 2011-06-29 | 大庆油田有限责任公司 | Capacitance-type sensor used for horizontal well moisture percentage measurement |
| CN103104255A (en) * | 2013-01-22 | 2013-05-15 | 西安交通大学 | Device and method for measuring downhole liquid production profile flow and water holding capacity |
| CN108872329A (en) * | 2018-06-29 | 2018-11-23 | 南京碧盾环保科技股份有限公司 | Oil concentration measuring instrument in a kind of water |
-
1986
- 1986-02-22 CN CN 86200819 patent/CN86200819U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7028568B2 (en) | 2002-12-18 | 2006-04-18 | Denso Corporation | Sensor having resin mold casing and method of manufacturing the same |
| CN100401046C (en) * | 2005-11-10 | 2008-07-09 | 上海港复兴船务公司 | Water content of lub oil analyzer for towboat rudder propeller |
| CN101173974B (en) * | 2006-06-30 | 2011-04-27 | 韩国电力公社 | Apparatus and method of water absorption test for generator stator winding insulator using cross capacitance |
| CN101182770B (en) * | 2007-12-27 | 2011-06-29 | 大庆油田有限责任公司 | Capacitance-type sensor used for horizontal well moisture percentage measurement |
| CN102012387A (en) * | 2010-09-28 | 2011-04-13 | 西安交通大学 | Lubricant oil trace moisture sensor probe and online monitoring method |
| CN102012387B (en) * | 2010-09-28 | 2012-07-04 | 西安交通大学 | Lubricant oil trace moisture sensor probe and online monitoring method |
| CN102023201A (en) * | 2010-11-09 | 2011-04-20 | 西南交通大学 | Method for testing time constant of change of water content in insulation paper of oil immersed type power equipment |
| CN103104255A (en) * | 2013-01-22 | 2013-05-15 | 西安交通大学 | Device and method for measuring downhole liquid production profile flow and water holding capacity |
| CN103104255B (en) * | 2013-01-22 | 2015-08-05 | 西安交通大学 | The device and method of production profile flow and specific retention under a kind of measuring well |
| CN108872329A (en) * | 2018-06-29 | 2018-11-23 | 南京碧盾环保科技股份有限公司 | Oil concentration measuring instrument in a kind of water |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CX01 | Expiry of patent term |