CN211602875U - Chemical oxygen demand tester calibrating installation - Google Patents
Chemical oxygen demand tester calibrating installation Download PDFInfo
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- CN211602875U CN211602875U CN201921951033.9U CN201921951033U CN211602875U CN 211602875 U CN211602875 U CN 211602875U CN 201921951033 U CN201921951033 U CN 201921951033U CN 211602875 U CN211602875 U CN 211602875U
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Abstract
The utility model provides a chemical oxygen demand tester calibrating installation, including the casing, be located the optical bench mounting groove of casing lower extreme, the standard optical filter, the nested formula optical bench of installation light filter, the photochopper of cover on the casing, the light filter can replace chemical oxygen demand (CODcr) solution standard substance, the optical bench is used for the fixed optical filter, and the optical bench is fixed a position and is protected the light filter, the photochopper is used for hiding ambient light. The utility model provides a chemical oxygen demand determinator for light filter verification chemical oxygen demand determinator for device calibrating apparatus has swift safety, can repeat the characteristics of rapid stabilization measurement, uses the light filter to avoid the chemical oxygen demand to determine the pollution that the in-process brought the waste liquid, has reduced the examination cost, has shortened the verification time. The nested optical bench meets two requirements of verification and source tracing.
Description
Technical Field
The utility model relates to a spectrophotometry principle apparatus calibrating device, in particular to a chemical oxygen demand apparatus calibrating device.
Background
The chemical oxygen demand determinator is divided into two categories according to the technical principle, one category is the spectrophotometric principle, and the chemical oxygen demand is determined by a spectrophotometric method by using a specified amount of potassium dichromate to oxidize a water body under a certain condition, so that hexavalent chromium is quantitatively converted into trivalent chromium and utilizing an absorption peak of the trivalent chromium at 610nm or an absorption peak of the hexavalent chromium at 420 nm. The chemical oxygen demand measuring instrument is divided into a digestion furnace part and a measuring part. The other is the electrochemical principle. The utility model discloses to the examination instrument of first kind spectrophotometry principle design and manufacture.
The existing detection method depends on a chemical oxygen demand (CODcr) solution standard substance, the main components of the chemical oxygen demand (CODcr) solution standard substance are potassium hydrogen phthalate (GB06106) national second-level standard substance, high-purity acid and laboratory first-level water, and the three raw materials are prepared into a mixture by a weighing-capacity method at room temperature. There are a number of technical problems with such methods. 1. The chemical oxygen demand solution standard substance is a sulfuric acid solution of phthalic acid hydrogen, a prefabricated mixed reagent depending on equipment manufacturers is used, the prepared mixed reagent contains potassium dichromate, mercuric sulfate, silver sulfate and concentrated sulfuric acid, the prepared mixed reagent is toxic and highly corrosive chemical substances, a large amount of concentrated sulfuric acid is used in the process of preparing a special reagent, the reagent cannot be uniformly mixed with a water sample before digestion, the solution can be splashed when digestion is carried out, a protective device needs to be worn as required in the use process, and the used waste liquid and waste liquid need to be specially treated, otherwise, the environment pollution is caused. 2. The steps of preparing the prefabricated reagent on site are complicated, the prefabricated reagent needs to be strictly carried out according to the instrument operation instruction, otherwise, the deviation of the measured data is large, and the verification condition of the chemical oxygen demand determinator is misjudged. 3. In the chemical oxygen demand tester calibration process, the calibration time is long due to the fact that the solution is used for carrying out metering calibration after a series of pretreatment such as digestion, the chemical oxygen demand solution standard substance is packaged by an ampoule bottle and is inconvenient to carry, inconvenience is brought to field calibration, and the digested solution is inconvenient to reuse. 4. The method uses a chemical oxygen demand solution standard substance, is complex to operate, introduces a plurality of errors in the whole process, and has various interference components to influence the data accuracy. The prior art uses a cuvette or tube for color comparison, uses a plurality of different cuvettes or digestion tubes, and inevitably introduces errors in the photometric measurement process. 6. The 4 standard solutions with different concentrations are needed for testing one chemical oxygen demand tester, and the price of the current chemical oxygen demand standard solution is high. Different manufacturers of chemical oxygen demand testers have different prefabricated reagents, and the price of a single prefabricated reagent is very high, and the quality guarantee period is short, so that the problem of high detection cost is caused to a detected enterprise.
Disclosure of Invention
To current chemical oxygen demand determinator verification method produce pollution waste liquid, complex operation, inconvenient carrying, standard substance can not reuse, the verification process in the degree of accuracy interference factor many, examine and determine shortcoming such as cost too high, the utility model provides a pollution-free, easy operation, conveniently carry, repeatedly usable's chemical oxygen demand determinator calibrating installation.
The utility model discloses a realize through following technical scheme:
the utility model provides a chemical oxygen demand apparatus calibrating installation, its characterized in that includes the casing, the optical bench mounting groove that the lower extreme of casing set up, nestification is in optical bench on the optical bench mounting groove installs the light filter that standard substance corresponds on the optical bench, and chemical oxygen demand apparatus calibrating installation is used for the stopper of square detection cell for the parallelogram regulation chi of adjusting the casing position, the cover is on the casing and is laid the photochemistry oxygen demand apparatus and detect the photochemistry oxygen demand apparatus photochemistry instrument and detect the photoch.
The shell is a tubular body with one side surface being a plane and the other side surfaces being cambered surfaces, and the color of the shell is black. The shell is designed into a test tube shape, so that the optical bench is placed in the middle of the detection pool, otherwise, the optical filter can shake or incline in the placing process of the instrument detection pool, and the incident light can not vertically penetrate through the optical filter, so that the measured data is deviated. A white vertical cross mark line is arranged in the middle of the side plane of the shell and used for aligning the incident direction of a light source of the chemical oxygen demand measuring instrument and ensuring that light vertically passes through the optical filter. The housing and optical bench are black to prevent stray light generated by the instrument from being reflected to the end of the instrument receiving the signal. One side of the shell is set to be a plane, and the position of the shell can be adjusted by utilizing the parallelogram adjusting ruler.
The optical bench is characterized in that the bottom end of the shell is provided with an optical bench mounting groove of a nested structure, the optical bench is mounted on the shell in a nested mode, and the nested structure facilitates the disassembly and assembly of the optical bench.
An elastic clamping piece is arranged between the optical bench and the optical filter and used for fixing the optical filter in the optical bench, and a third connecting hole is formed in the elastic clamping piece.
The optical bench is provided with a first connecting through hole and a second connecting through hole, the second connecting through hole and the third connecting through hole are connected through a connecting device such as a screw to play a role in fixing the optical filter, and the first connecting through hole is used for fixing the optical bench and the shell through the connecting device.
The stopper is installed at the spacing boss in square detection pond recess including the stopper that is used for injecing the calibrating installation position for the installation pipe of the fixed chemical oxygen demand tester calibrating installation casing of installation, the light through-hole that stopper installation socle end set up, installation pipe upper portion sets up the U-shaped space for 90 intervals, there is the chucking boss U-shaped space pipe inner wall top for the chucking casing. The limiter can play a stabilizing role in the square detection pool, so that the nested optical bench is kept to be positioned, stabilized and protected from light.
The light shield comprises a light shield tube and a light shield, and the light shield is a square detection cell light shield or a circular detection cell light shield. The size of the inner wall of the light shading cylinder is larger than or equal to that of the shell, the size of the light shading cover when the light shading cover is square is equal to or larger than that of the limiting stopper, and the size of the light shading cover when the light shading cover is round is equal to or larger than that of the shell. After the chemical oxygen demand determinator calibrating device is additionally provided with the light chopper, light in the environment cannot be introduced into the detection pool.
The optical filter is an absorption type neutral density optical filter. The doped optical glass has the transmittance of more than 90 percent in the whole ultraviolet and visible light regions, has very stable physical properties and small temperature coefficient, and can meet the technical requirement that the uncertainty component is as small as possible. It has high hardness, no brittleness, no toxicity, no radiation, low cost and easy carrying. Therefore, an absorption-type neutral density filter was used as the optical filter for the assay. The calibration of the Chemical Oxygen Demand (COD) meter is realized by controlling the glass thickness to control the light throughput (namely, the transmittance).
The absorbance values A and transmittance T corresponding to the filters with different COD values are as follows:
when the COD value is 50mg/L, A is 0.1976, T is 63.44%,
when the COD value is 100mg/L, A is 0.3953, T is 40.25%,
when the COD value is 300mg/L, A is 0.1992, T is 63.19%,
when the COD value is 500mg/L, A is 0.3320, T is 46.56%,
when the COD value is 1000mg/L, a is 0.6640 and T is 21.82%.
The optical filter for detecting the Chemical Oxygen Demand (COD) measuring instrument is selected to adopt an optical filter for manufacturing two detection points of 50mg/L and 100mg/L at the position of 420nm in a low range and an optical filter for manufacturing three detection points of 300mg/L, 500mg/L and 1000mg/L at the position of 610nm in a high range. And reproducing and fixing the absorbance value on the optical filter, wherein the value can be traced to the national reference substance.
The absorbance value is converted into a transmission ratio value through calculation, an optical filter is manufactured through the transmission ratio value, chemical elements are doped in the substrate material, and the spectral absorbance, namely the transmittance, of the optical filter is controlled by controlling the thickness of the substrate. And screening by using a high-grade ultraviolet-visible spectrophotometer to screen out the optical filter which has a smaller indication error and is closest to the expected value.
The utility model discloses replace the chemical oxygen demand (CODcr) solution standard substance of current verification technique with the light filter to avoided chemical oxygen demand standard substance's among the current verification technique pollution, inconvenient carrying, examination time long, can not repetitiveness use, problem such as with high costs completely, the utility model provides a chemical oxygen demand determinator calibrating installation need not dispose standard substance owing to having applied the light filter, so the verification step is simple, and the verification time shortens by a wide margin, and has avoided the standard solution of configuration among the prior art, uses the limited technical defect of number of times, consequently examines and determine the cost and descend by a wide margin. The utility model discloses owing to need not dispose standard solution, so avoided the error that various factors brought in the configuration process.
The utility model discloses a chemical oxygen demand tester calibrating installation is provided with nested formula optical bench, not only plays the effect of positioning action and protection to the light filter for the light filter is placing and is carrying the in-process and be difficult for colliding with, the scratch, and the protection light filter is difficult for polluting in the use, thereby has guaranteed measured data's accuracy. And two requirements of verification and source tracing are met. The utility model discloses a chemical oxygen demand tester calibrating installation can examine and determine that the measuring cell is square chemical oxygen demand tester and measuring cell for circular shape chemical oxygen demand tester.
Drawings
FIG. 1: stereogram of chemical oxygen demand tester
FIG. 2: front view of chemical oxygen demand tester
FIG. 3: perspective view of a stopper
FIG. 4: front view of stopper
FIG. 5: parallelogram regulating rule
FIG. 6: front view of shutter
FIG. 7: front view of shutter
FIG. 8: FIG. 6 is a top view of the shutter
FIG. 9: FIG. 7 is a top view of the shutter
In the figure: the optical bench comprises a shell 1, a cross mark 1-1, an optical bench mounting groove 2, a nested optical bench 3, a first connecting through hole 3-1, a second connecting through hole 3-2, a third connecting through hole 3-3, a connecting device 3-4, an elastic clamping piece 3-5, an optical filter 4, a light chopper 5, a light shading cylinder 5-1, a light shading cover 5-2, a parallelogram adjusting ruler 6, a limiter 7-1, a limiting boss 7-2, a mounting pipe 7-3, a light through hole 7-4 and a clamping boss 7-5.
Detailed Description
The first embodiment is as follows:
a chemical oxygen demand tester calibrating device is characterized by comprising a shell 1, an optical bench mounting groove 2 arranged at the lower end of the shell, a nested optical bench 3 arranged in the optical bench mounting groove, an optical filter 4 arranged on the optical bench, an elastic clamping piece 3-5 sleeved on the shell and arranged at a detection pool port 5 of the chemical oxygen demand tester, and a third connecting through hole 3-3 arranged on the elastic clamping piece, wherein the elastic clamping piece is used for fixing the optical filter on the optical bench.
One side face of the shell 1 is a plane, the other side faces are of an arc-surface tubular structure, the color of the shell is black, a vertical cross mark line 1-1 is marked on the central position of the side plane of the shell, a first connecting through hole 3-1 and a second connecting through hole 3-2 are arranged on an optical bench, the second connecting through hole 3-2 and a third connecting through hole 3-3 fix the optical bench and an optical filter through a connecting device 3-4, the first connecting through hole 3-1 fixes the optical bench and the shell through a connecting device 3-4, and the connecting device 3-4 in the embodiment is a screw.
The optical filter is an absorption neutral density optical filter, and the doped optical glass is used as a main material of the optical filter.
The absorbance values A and transmittance T corresponding to the filters with different COD values are as follows:
when the COD value is 50mg/L, A is 0.1976, T is 63.44%,
when the COD value is 100mg/L, A is 0.3953, T is 40.25%,
when the COD value is 300mg/L, A is 0.1992, T is 63.19%,
when the COD value is 500mg/L, A is 0.3320, T is 46.56%,
when the COD value is 1000mg/L, a is 0.6640 and T is 21.82%.
The chemical oxygen demand measuring instrument with the square detection cell is tested.
The chemical oxygen demand determinator calibrating device for calibrating the detection cell to be a square chemical oxygen demand determinator is equipped with a stopper 7.
Preheating and zero setting: and opening the chemical oxygen demand measuring instrument, preheating for 30 minutes, and then zeroing the chemical oxygen demand measuring instrument to prepare for detecting the chemical oxygen demand measuring instrument.
Installing a calibration device of an optical filter and a chemical oxygen demand tester: a standard optical filter 4 with a COD value of 50mg/L and an elastic clamping piece 3-5 are used for fixing a second connecting through hole 3-2 and a third connecting through hole 3-3 on an optical bench through a connecting device 3-4, a nested optical bench 3 provided with the optical filter is nested on an optical bench mounting groove 2 of a chemical oxygen demand tester calibrating device, and the embedded optical bench 3 is fixed on a shell 1 through a first through hole 3-1 by using the connecting device 3-4.
The chemical oxygen demand determinator calibrating device is arranged in the detection pool: a chemical oxygen demand tester calibrating device is provided with a limiter 7, a shell 1 of the calibrating device is placed in a limiter mounting hole 7-3, and a limiter clamping boss 7-5 clamps the shell 1 of the calibrating device. After the limiter is installed on the shell, the limiting boss 7-2 is inserted into a groove of the square detection pool, the limiting block 7-1 plays a limiting role, and the position of the light through hole 7-4 of the limiter is aligned to a cross mark on the lateral plane of the shell, so that the optical filter can be perpendicular to incident light, and the stability of the calibrating device in the detection pool is ensured.
Installing a light chopper: after the installation position of the chemical oxygen demand tester calibrating device is adjusted, a square light shield is installed on the calibrating device shell 1, the light shield cylinder 5-1 is overlapped with the calibrating device shell 1, the light shield 5-2 shields the limiting stopper, and no ambient light exists in a chemical oxygen demand tester detection pool.
Detecting a chemical demand determinator: after the calibrating device is adjusted, the chemical oxygen demand measuring instrument is calibrated, the optical filter with the simulated standard solution COD value of 50mg/L is placed into the detection pool for 3 times of calibration at a low range, and then the optical filter with the simulated standard solution COD value of 100mg/L is calibrated for 3 times. And (3) placing the optical filters with COD values of 300mg/L, 500mg/L and 1000mg/L of the simulated standard solution into the detection cell for 3 times of detection respectively at a high range grade, and collecting and storing the optical filters after the detection is finished so as to facilitate the next detection. The filter can be repeatedly used.
Example two:
the chemical oxygen demand measuring instrument as described in example one was examined with a chemical oxygen demand measuring instrument having a circular measuring cell and equipped with a parallelogram adjusting ruler 6.
Preheating and zero setting: and opening the chemical oxygen demand measuring instrument, preheating for 30 minutes, and then zeroing the chemical oxygen demand measuring instrument to prepare for detecting the chemical oxygen demand measuring instrument.
Installing a calibration device of an optical filter and a chemical oxygen demand tester: a standard optical filter 4 with a COD value of 50mg/L and an elastic clamping piece 3-5 are used for fixing a second connecting through hole 3-2 and a third connecting through hole 3-3 on an optical bench through a connecting device 3-4, a nested optical bench 3 provided with the optical filter is nested on an optical bench mounting groove 2 of a chemical oxygen demand tester calibrating device, and the embedded optical bench 3 is fixed on a shell 1 through a first through hole 3-1 by using the connecting device 3-4.
And placing the prepared chemical oxygen demand determinator testing device in a chemical oxygen demand determinator testing pool.
Adjusting a chemical oxygen demand determinator calibrating device to enable the optical filter to be perpendicular to incident light: the side plane of the shell faces the display screen direction of the chemical oxygen demand measuring instrument, one side of the parallelogram adjusting ruler 6 is close to the inner wall of the detection pool of the chemical oxygen demand measuring instrument, and the other opposite side of the parallelogram adjusting ruler 6 is close to the side plane of the shell 1 of the chemical oxygen demand measuring instrument calibration device, so that the optical filter is perpendicular to the optical path parallel marking.
Installing a light chopper: after the position of the chemical oxygen demand tester calibrating device is adjusted in the above steps, a circular light chopper is arranged on the outer shell 1 of the calibrating device, so that no ambient light exists in a chemical oxygen demand tester detection pool.
Detecting a chemical demand determinator: after the calibrating device is adjusted, the chemical oxygen demand measuring instrument is calibrated, the optical filter with the simulated standard solution COD value of 50mg/L is placed into the detection pool for 3 times of calibration at a low range, and then the optical filter with the simulated standard solution COD value of 100mg/L is calibrated for 3 times. And (3) placing the optical filters with COD values of 300mg/L, 500mg/L and 1000mg/L of the simulated standard solution into the detection cell for 3 times of detection respectively at a high range grade, and collecting and storing the optical filters after the detection is finished so as to facilitate the next detection/use. The filter can be repeatedly used.
Example three:
the chemical oxygen demand measuring instrument measuring apparatus as described in example one measures a chemical oxygen demand measuring instrument having a circular measuring cell in which an optical path incident arrow is marked.
The "preheating and zeroing" stage and the "calibration of the calibration apparatus for mounting filters and chemical oxygen demand analyzer" stage are as in the above examples and are not described in detail.
Adjusting a chemical oxygen demand determinator calibrating device to enable the optical filter to be perpendicular to incident light: and aligning the cross mark line on the lateral plane of the shell with an incident light arrow mark outside the detection cell, so that the optical filter is perpendicular to an incident light path.
Installing a light chopper: after the position of the chemical oxygen demand tester calibrating device is adjusted in the above steps, a circular light chopper is arranged on the outer shell 1 of the calibrating device, so that no ambient light exists in a chemical oxygen demand tester detection pool.
Detecting a chemical demand determinator: after the calibrating device is adjusted, the chemical oxygen demand measuring instrument is calibrated, the optical filter with the simulated standard solution COD value of 50mg/L is placed into the detection pool for 3 times of calibration at a low range, and then the optical filter with the simulated standard solution COD value of 100mg/L is calibrated for 3 times.
And (3) placing the optical filters with the COD values of 300mg/L, 500mg/L and 1000mg/L of the simulated standard solution into the detection cell for 3 times of detection respectively according to the method in a high-range grade, and collecting and storing the optical filters after the detection is finished so as to be used in the next detection. The filter can be repeatedly used.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (7)
1. The chemical oxygen demand tester calibrating device is characterized by comprising a shell (1), an optical bench mounting groove (2) arranged at the lower end of the shell, a nested optical bench (3) nested in the optical bench mounting groove (2), an optical filter (4) mounted on the optical bench, elastic clamping pieces (3-5) mounted between the optical bench (3) and the optical filter (4), and a light chopper (5) sleeved on the shell (1) and mounted at a detection pool port of the chemical oxygen demand tester.
2. The chemical oxygen demand analyzer calibrating apparatus as defined in claim 1, wherein the housing (1) is a tubular body having a flat side and an arc side, and the color of the housing is black.
3. The chemical oxygen demand analyzer calibrating apparatus as defined in claim 1, wherein the optical bench is provided with a first connecting through hole (3-1) and a second connecting through hole (3-2), and the elastic clip (3-5) is provided with a third connecting through hole (3-3) for connecting the connecting means (3-4) for the first through hole, the second through hole, and the third through hole.
4. The chemical oxygen demand analyzer calibrating apparatus according to claim 1, wherein the optical filter (4) is an absorption type neutral density filter, the optical filter is a doped optical glass, the transmittance is adjusted by controlling the thickness of the glass, the absorbance values a and T corresponding to the optical filters with different chemical oxygen demand COD values are as follows:
when the COD value is 50mg/L, A is 0.1976, T is 63.44%,
when the COD value is 100mg/L, A is 0.3953, T is 40.25%,
when the COD value is 300mg/L, A is 0.1992, T is 63.19%,
when the COD value is 500mg/L, A is 0.3320, T is 46.56%,
when the COD value is 1000mg/L, a is 0.6640 and T is 21.82%.
5. The chemical oxygen demand meter calibrating apparatus as set forth in claim 1, wherein the chemical oxygen demand meter calibrating apparatus is equipped with a parallelogram adjusting ruler (6).
6. The chemical oxygen demand tester calibrating apparatus according to claim 1, wherein the chemical oxygen demand tester calibrating apparatus is provided with a stopper (7), the stopper (7) comprises a stopper (7-1), a stopper boss (7-2), a mounting tube (7-3), a light through hole (7-4) arranged at the bottom end of the mounting tube, the upper part of the mounting tube (7-3) is provided with U-shaped gaps at intervals of 90 degrees, and the top end of the inner wall of the U-shaped gap tube is provided with a clamping boss (7-5) for clamping the housing.
7. The chemical oxygen demand meter calibrating apparatus according to claim 1 or 6, wherein the light shield (5) comprises a light shield cylinder (5-1) and a light shield (5-2), the size of the inner wall of the light shield cylinder (5-1) is larger than or equal to the size of the housing, the size of the light shield cylinder (5-2) when it is square is equal to or larger than the size of the stopper, and the size of the light shield cylinder (5-2) when it is circular is equal to or larger than the size of the housing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921951033.9U CN211602875U (en) | 2019-11-13 | 2019-11-13 | Chemical oxygen demand tester calibrating installation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921951033.9U CN211602875U (en) | 2019-11-13 | 2019-11-13 | Chemical oxygen demand tester calibrating installation |
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| CN211602875U true CN211602875U (en) | 2020-09-29 |
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| CN201921951033.9U Active CN211602875U (en) | 2019-11-13 | 2019-11-13 | Chemical oxygen demand tester calibrating installation |
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