CN206178041U - Resistivity test device of vertically liquid - Google Patents
Resistivity test device of vertically liquid Download PDFInfo
- Publication number
- CN206178041U CN206178041U CN201620266700.XU CN201620266700U CN206178041U CN 206178041 U CN206178041 U CN 206178041U CN 201620266700 U CN201620266700 U CN 201620266700U CN 206178041 U CN206178041 U CN 206178041U
- Authority
- CN
- China
- Prior art keywords
- electrode
- liquid
- measurement
- container
- resistivity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 85
- 238000012360 testing method Methods 0.000 title claims description 30
- 238000005259 measurement Methods 0.000 claims abstract description 62
- 239000004020 conductor Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 6
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- 210000005239 tubule Anatomy 0.000 claims abstract description 6
- 229920001940 conductive polymer Polymers 0.000 claims abstract description 3
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims abstract description 3
- 238000005253 cladding Methods 0.000 claims abstract 3
- 239000007864 aqueous solution Substances 0.000 claims abstract 2
- 230000015572 biosynthetic process Effects 0.000 claims abstract 2
- 230000005611 electricity Effects 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 7
- 238000004382 potting Methods 0.000 claims description 4
- 239000002322 conducting polymer Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 2
- 230000001174 ascending effect Effects 0.000 claims 1
- 238000005538 encapsulation Methods 0.000 abstract description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 239000012774 insulation material Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 4
- 239000003708 ampul Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 238000011000 absolute method Methods 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 235000005074 zinc chloride Nutrition 0.000 description 2
- 239000011592 zinc chloride Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
Abstract
The utility model relates to a material detects and the instrument and meter industry, discloses the measuring device that vertically liquid resistance is rateed, electrode group that the encapsulation electrode formed including liquid container, biax positioning fixture, inert conductor and insulating encapsulating material formed, electrode group fixing device, electric current source and the voltameter, forming the electrode group with four electrodes that adopt insulating cladding inert conductors are fixed together, the straight tubule of length that utilizes one end to seal is as the container of liquid, through electric current source and the voltameter complete measurement circuit of formation that links to each other with the electrode group respectively. The utility model discloses a device can be used to the measurement of liquid metal, fused salt, the aqueous solution or conductive polymer's resistivity, through vertically electrode arrangement, reduces liquid container's section size and processes the degree of difficulty, has reduced equipment and material cost.
Description
Technical field
This patent is related to material tests and instrument and meter industry, and specifically, this patent is to carry out high temperature, corrosivity, Asia
The device and technical method of the resistivity properties test of the liquid existed under the harsh conditions such as stable state.
Background technology
Resistivity be characterize liquid metal, fused salt, sea water, metal glass, conducting polymer, the property of sewage, structure with
The important physical parameter of state.But, due to the existence condition of these liquid it is harsher, and with stronger corrosivity, with
There is stronger interaction in common electrode material, test device, cause to pollute sample, damage sample so that test result
It is undesirable.Conventional resistivity measurement method is contact type measurement, compared with non-cpntact measurement, with high precision, and good reliability,
The advantage such as equipment is simple.
Conventional resistivity test device is the liquid container of horizontal positioned, and according to Ohm's law, container needs larger
Size, could ensure the precision of measurement.On the one hand, the test container of high temperature fluent metal etc., by bars such as burner hearth, protective atmospheres
The restriction of part；On the other hand, the liquid container of horizontal positioned, even if under condition of negative pressure, still there is sample and be difficult to inject, gas
Bubble is difficult to empty, the technical barrier such as electrode is difficult to arrange.Vertically the measurement apparatus of arrangement have sectional dimension less and stably may be used
Control, stability are higher, and sample injection and electrode placement operations are convenient, are not likely to produce the advantages such as bubble, measuring accuracy height；But it is relative
Horizontally disposed test device, vertically the device of arrangement generally operate complex, demarcate flow process loaded down with trivial details.
This patent proposes a kind of straight tubule of length by the use of an end closure as container, conductive using the encapsulation of thin-walled quartz socket tube
Material as electrode, for the device of the resistivity high-acruracy survey of liquid, with the advantage such as simple structure, easy to operate, and
Continuous measurement can be realized and become temperature measurement.
[patent：201010032433.7] a kind of Quick detection device for resistivity of molten metals and detection method are proposed, should
Melt is sucked quartziferous pair of test cylinder by system using the working method of negative pressure, and the system uses reliability, but current loop
It is complex, so as to affect certainty of measurement to a certain extent.[patent：201210244182.8] propose a kind of single conductance cell
High-precision seawater salinity gauge, facility compact, good stability, certainty of measurement are high, easy to operate, high degree of automation, and
A kind of conductive pool structure of cuboid is proposed, but the patent is not given to the concrete structure parameter of the conductance cell of key structure
Clear and definite patent requirements, and the invention is dfficult to apply to the resistivity measurement of the systems such as high-temperature metal, fused salt.[patent：
201010508948.X] the spiral liquid runner of a kind of concentric ring electrode and coaxial spiral line is invented, it is conductivity measurement
Area between larger electrode is provided, so as to improve the certainty of measurement of electrical conductivity；The device is particularly suitable for the liquid electric of low conductivity
The measurement of conductance, but be difficult to meet measurement requirement for high conductance, high viscosity, fused salt of poor fluidity etc..Patent [application number：
201110456218.4] a kind of Multipurpose induction conductivity measuring electrode is proposed, the electrode is by metal shell and regulation at it
On the composition such as insulation numerical value disk, electrode retaining collar, shading ring, the noncontact that resistivity is carried out by the way of electromagnetic induction surveyed
Amount, is a kind of non-contacting measurement apparatus.Patent [application number：201120405940.0] propose a kind of new absolute method conductance
Conductance cell locating support is used in rate measurement, and the measurement apparatus that the device is arranged horizontally, floor space is larger, it is difficult to meet higher temperatures
The measurement of the liquid resistivity under degree.Patent [application number：201310277221.9] propose a kind of solution and high-temperature fusant conductance
The absolute method of measurement and device of rate, the device measures the electrical conductivity of conducting liquid, knot using direct-current bridge and capillary effect
Structure is ingenious, but the surface tension of the liquid in capillary tube can have a certain impact to measurement result tool.Patent [application number：
201410617707.7] a kind of Combined resistance rate measuring system and the method with its measured resistivity are proposed, the device is main
For the resistivity measurement of mud, container, electrode size it is big, for sample prepares and the requirement of energy resource consumption is higher, it is difficult to
Meet the fused salt of higher-value and the resistivity measurement of metal.
Utility model content
The utility model discloses a kind of resistivity test device of vertical liquid, is held by the use of the straight tubule of length as liquid
Device is measured with the inert electrode of coated insulation material with the vertical high precision for realizing liquid resistivity.
For achieving the above object, the technical solution adopted in the utility model is：A kind of measurement of vertical liquid resistivity
Device, the measurement apparatus are characterized mainly in that：Four electrodes using insulating wrapped inert conductor are fixed together to be formed
Electrode group, by the use of an end closure the straight tubule of length as liquid container, by current source and voltameter respectively with electrode group phase
Company forms complete measuring loop；Device includes liquid container, twin shaft positioning fixture, inert conductor and insulative potting material composition
The electrode group of encapsulated electrode a, b, c, d composition, the current source that is connected with electrode a, d of electrode group fixing device and with electrode b, c
Connected voltameter.
Compared with prior art, advantage of the present utility model and good effect are：The electricity of liquid described in the utility model
Resistance rate measurement apparatus, have the electrode group of inert material using surface, it is to avoid the short circuit of traditional four electrode, simplify measurement dress
The structure put, using the straight tubule of length of the sectional uniform vertically placed, it is to avoid the residual of bubble, eliminating temperature change causes
Impact of the liquid surface lifting to measurement result, realize the high-acruracy survey of the resistivity of liquid.
Description of the drawings
The measurement apparatus structural representation of Fig. 1 vertical liquid resistivity.In figure, liquid container 1, twin shaft positioning fixture
2, encapsulated electrode 4 and electrode group fixing device 5 that inert conductor 3 and insulative potting material are constituted.
The electrode structure schematic diagram of Fig. 2 coated insulation materials.
The structure chart of the electrode group that Fig. 3 is made up of four encapsulated electrodes.
Fig. 4 liquid Pbs50Sb50Alloy resistivity measurement temperature relation at high temperature.
Specific embodiment
The technical scheme of this patent is described in further detail with reference to specific embodiment.
A kind of measurement apparatus of vertical liquid resistivity, referring to accompanying drawing 1, this patent includes：Liquid container 1, twin shaft is fixed
The electrode group of encapsulated electrode a, b, c, d composition of position fixture 2, inert conductor 3 and insulative potting material 4 composition, electrode group are fixed
Current source that device 5 is connected with electrode a, d and the voltameter being connected with electrode b, c, concrete operations are as follows.
The cleaning of electrode and measurement container is carried out using ethanol, and is dried using exsiccator etc., using slide gauge
Measure the internal diameter D of liquid container, vertical dimension H of vessel port to container bottom inwall.
Testing liquid is added in liquid container, and is slightly shaken to measuring container, by what is remained in testing liquid
Removal of bubbles, so as to reducing due to changes of section caused by bubble disturbance and preventing between aeration electrode and testing liquid
Contact.
Twin shaft positioning fixture 2 coordinates with the transverse plane of liquid container, and the test container for filling testing liquid is maintained at into perpendicular
Nogata to.
Assembling electrode group, and measures dimensional parameters, the external diameter Φ of coated insulation material, electrode b, c measurement end it is vertical between
Away from L.
The clear and definite electrode group of parameter is slowly inserted in testing liquid, and is slightly shaken to measuring container, be introduced into
Removal of bubbles in testing liquid, so as to reduce due to bubble disturbance caused by changes of section and prevent aeration electrode with
Contact between testing liquid, and horizontal range l of the measurement end of measuring electrode a and bottom center.
Constantly it is passed through in liquid receptacle in the cool-bag under shielding gas, and the temperature required for container is placed in about
30min, until the uniform temperature fields of liquid and reaching required temperature.
The terminals of electrode a, d in electrode group are connected respectively with current source, the terminals of electrode b, c respectively with voltage
Meter is connected, and constitutes complete path, obtains current value I.
During constant-current source connects electrode b, c, using inverter, the sense of current conversion of constant-current source is realized, from
And the contact potential between electrode and testing liquid is reduced, obtain high-precision magnitude of voltage U.
The calculating of resistivity：, conductivityσ=1/ ρ.
Embodiment 1：Liquid Pb is measured with following steps50Sb50Alloy resistivity measurement at high temperature.
The cleaning of electrode and measurement container is carried out using ethanol, and is dried using exsiccator etc., using slide gauge
Measure the internal diameter D=18.1mm of liquid container, vertical dimension H=348mm of vessel port to container bottom inwall.
By Pb50Sb50Alloy block adds liquid container, is passed through protective gas, until resistivity measurement terminates, by Pb50Sb50
Alloy block and liquid container are placed under hot conditionss makes it melt as liquid.
Slightly shaken to measuring container, by the removal of bubbles remained in testing liquid.
The transverse plane of positioning fixture 2 and liquid container is coordinated, the test container for filling testing liquid is maintained at into vertical
Direction.
Assembling electrode group, and dimensional parameters are measured, coated insulation material is the external diameter Φ=2.82mm of quartz ampoule, using tungsten
Silk is used as electrode conductor, vertical interval L=123.76mm of measuring electrode b, c measurement end.
The clear and definite electrode group of parameter is slowly inserted in liquid alloy to be measured, and is slightly shaken to measuring container, electricity
After pole position is stable, and horizontal range l=31.0mm of the measurement end of measuring electrode a and bottom center.
Constantly it is passed through in liquid receptacle in the cool-bag under shielding gas, and the temperature required for container is placed in about
30min, until the uniform temperature fields of liquid and reaching required temperature.
The terminals of electrode a, d in electrode group are connected respectively with current source, complete current path is constituted, electricity is obtained
Stream I=0.54732 amperes.
Voltameter connects electrode b, c, and 550 degrees Celsius obtain high-precision magnitude of voltage U=2.69E-04 volts.
The calculating of resistivity：, under different temperatures,
The result of resistance alloys rate is as shown in Figure 4.
Embodiment 2：Resistivity measurement of the melting zinc chloride under 450 degrees Celsius is measured with following steps.
The cleaning of electrode and measurement container is carried out using ethanol, and is dried using exsiccator etc., using slide gauge
Measure liquid container internal diameter D be 12.60mm, vertical dimension H=148.02mm of vessel port to container bottom inwall.
Zinc chloride powder block is added into liquid container, protective gas is passed through, until resistivity measurement terminates, by enough powder
End and liquid container are placed under hot conditionss makes it melt as liquid.
Slightly shaken to measuring container, the bubble remained in testing liquid, vapor are discharged.
The transverse plane of positioning fixture 2 and liquid container is coordinated, the test container for filling testing liquid is maintained at into vertical
Direction.
Electrode group dimensional parameters are measured, coated insulation material is the external diameter Φ=28.0mm of quartz ampoule, using tungsten filament as electricity
Pole conductor, vertical interval L=36.61mm of measuring electrode b, c measurement end.
The clear and definite electrode group of parameter is slowly inserted in liquid alloy to be measured, and is slightly shaken to measuring container, electricity
After pole position is stable, and horizontal range l=21.0mm of the measurement end of measuring electrode a and bottom center.
Constantly it is passed through in liquid receptacle in the cool-bag under shielding gas, and the temperature required for container is placed in about
20min, until the uniform temperature fields of liquid and reaching required temperature.
The terminals of electrode a, d in electrode group are connected respectively with current source, complete current path is constituted, electricity is obtained
Stream I=9.75E-05 peaces.
Voltameter connects electrode b, c, and it is 6.36E-02 volts to obtain high-precision magnitude of voltage U.
The calculating of resistivity：, it is 238.06 Ω
Cm, conductivityσ=1/ ρ, are 4.2 E-03 (Ω cm)-1。
Embodiment 3：Resistivity of the NaCl saturated solutions at 25 DEG C is measured with following steps.
The cleaning of electrode and measurement container is carried out using ethanol, and is dried using exsiccator etc., using slide gauge
Measure the internal diameter D=18.12mm of liquid container, vertical dimension H=348.0mm of vessel port to container bottom inwall.
Saturation NaCl solution is added into liquid container.
Slightly shaken to measuring container, the bubble remained in testing liquid, vapor are discharged.
The transverse plane of positioning fixture 2 and liquid container is coordinated, the test container for filling testing liquid is maintained at into vertical
Direction.
Electrode group dimensional parameters are measured, coated insulation material is the external diameter Φ=2.80mm of quartz ampoule, using tungsten filament as electricity
Pole conductor, vertical interval L=97.2mm of measuring electrode b, c measurement end.
The clear and definite electrode group of parameter is slowly inserted in liquid alloy to be measured, and is slightly shaken to measuring container, electricity
After pole position is stable, and horizontal range l=3.08mm of the measurement end of measuring electrode a and bottom center.
Liquid container is placed in 1 hour in 25 degrees Celsius of water-bath, the uniform temperature fields of liquid are made.
The terminals of electrode a, d in electrode group are connected respectively with current source, complete current path is constituted, electricity is obtained
Stream I=0.325 milliamperes.
Voltameter connects electrode b, c, obtains high-precision magnitude of voltage U=4.357E-03.
The calculating of resistivity：, it is 4.026 Ω cm,
Conductivityσ=1/ ρ, is 0.2484 (Ω cm)-1。
Above example is only several in the several preferred implementation of this patent, it is noted that this patent is not limited to
Above-described embodiment；For the person of ordinary skill of the art, still can be to the technical scheme described in previous embodiment
Modify, or equivalent is carried out to which part technical characteristic；And these modifications or replacement, do not make relevant art side
The essence of case departs from the spirit and scope of this patent technical scheme required for protection.
Claims (6)
1. a kind of measurement apparatus of vertical liquid resistivity, the measurement apparatus are characterized mainly in that：By four using insulation
Cladding inert conductor electrode be fixed together to form electrode group, by the use of an end closure the straight tubule of length as liquid container,
Complete measuring loop is connected to form respectively with electrode group by current source and voltameter；Device includes liquid container (1), twin shaft
Electrode group, the electricity of encapsulated electrode a, b, c, d composition of positioning fixture (2), inert conductor (3) and insulative potting material (4) composition
Current source that pole group fixing device (5) is connected with electrode a, d and the voltameter being connected with electrode b, c.
2. a kind of measurement apparatus of vertical liquid resistivity according to claim 1, it is characterised in that：By insulant
（21）Cladding inert conductor（22）The elongated rod shape electrode of formation, sectional areaδFor 0.01mm2To 5.0mm2, insulant clad
Thickness be 0.01 ~ 2.5mm, the exposed length of measurement termination electrode contacted with liquidmFor 0.1 ~ 1.0mm, with ammeter, voltmeter phase
The exposed length of lead end for connecingnFor 1.0 ~ 50mm.
3. measurement apparatus of a kind of vertical liquid resistivity according to claim 1, it is characterised in that：Electrode is near liquid
One end of body container bottom be measurement end, four electricity ascending to the distance of liquid container sealing end according to electrode measurement end
Pole represents that successively the dimensional parameters of electrode group are the distance of b, c measurement end with a, b, c, dLFor 20 ~ 150mm；A, b measurement end
Spacingl abFor 3.0 ~ 20.0mm, the spacing of c, d measurement endl cdDimensional parameters and relative position for 3.0 ~ 20.0mm electrode groups exist
Keep constant in the measurement process of resistivity, all spacing are the distance along electrode axial direction.
4. a kind of measurement apparatus of vertical liquid resistivity according to claim 1, are primarily characterized in that：Measure back
After road is formed, testing liquid needs the measurement end of submergence electrode a, b, c, d.
5. a kind of measurement apparatus of vertical liquid resistivity according to claim 1, are primarily characterized in that：As liquid
The sealing end outer surface of the long straight tube of body container is plane, and inner surface smoothly transits；The size characteristic of container is the survey of electrode b, c
Long straight tube has identical section between amount end, its internal diameterDFor 8 ~ 50mm.
6. a kind of measurement apparatus of vertical liquid resistivity according to claim 1, are primarily characterized in that：Can be used for
The measurement of the resistivity of liquid metal, fused salt, aqueous solution or conducting polymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620266700.XU CN206178041U (en) | 2016-04-04 | 2016-04-04 | Resistivity test device of vertically liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620266700.XU CN206178041U (en) | 2016-04-04 | 2016-04-04 | Resistivity test device of vertically liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206178041U true CN206178041U (en) | 2017-05-17 |
Family
ID=58673010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620266700.XU Expired - Fee Related CN206178041U (en) | 2016-04-04 | 2016-04-04 | Resistivity test device of vertically liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206178041U (en) |
-
2016
- 2016-04-04 CN CN201620266700.XU patent/CN206178041U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Schiefelbein et al. | A high-accuracy, calibration-free technique for measuring the electrical conductivity of liquids | |
| Edwards et al. | Electrical conductivity of molten cryolite and potassium, sodium, and lithium chlorides | |
| CN107290591A (en) | A kind of resistivity test device of vertical liquid | |
| CN109856191A (en) | A method of detection sleeve grouting quality | |
| CN202710503U (en) | Four-electrode electrical conductivity sensor | |
| CN206178041U (en) | Resistivity test device of vertically liquid | |
| CN104034256B (en) | Concentric coplanar quartering ring-fourth class cyclotomy nesting pole plate inclination angle measurement method and device | |
| CN105588868A (en) | Oxygen probe | |
| CN106680588A (en) | Pressure intensity-controllable solid power electric conductivity test device | |
| CN106932444B (en) | A kind of batching interface test experience device and experimental method based on conductivity | |
| CN203299283U (en) | An apparatus for measuring the conductivity of high-temperature fused salt | |
| CN105157787A (en) | Method for measuring liquid level of yellow phosphorus in storage tank and device | |
| CN203705013U (en) | Double-capacitor sensor | |
| CN104019797B (en) | The nested pole plate of paired quartering ring-circle is staggeredly placed formula inclination angle measurement method and device in opposite directions | |
| CN104407227A (en) | Power grid pole mud resistivity measurement system | |
| CN104019798B (en) | The nested pole plate inclination angle measurement method of concentric coplanar trisection ring-circle and device | |
| CN211318600U (en) | Device for researching influence of solid electrode oxide film on liquid-solid contact resistance | |
| CN102116802B (en) | Device and method for rapidly detecting electric resistivity of molten metal | |
| CN201965112U (en) | High-precision seawater salinity measuring device | |
| CN206523561U (en) | A kind of plain type resistivity detecting device | |
| CN204347142U (en) | A kind of electrical network pole mud resistivity measuring system | |
| CN104502708A (en) | Electrical network electrode resistivity measurer | |
| CN215985836U (en) | Device for measuring high-temperature resistivity of molten glass | |
| CN203337218U (en) | Liquid-level measuring meter for totally-closed pressure environment | |
| CN110261459A (en) | A kind of device for controlling extremely low oxygen content in atmosphere and measuring its partial pressure of oxygen |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170517 |