CN102520127A - Measurement calibration method of falling number tester - Google Patents
Measurement calibration method of falling number tester Download PDFInfo
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- CN102520127A CN102520127A CN2011104249289A CN201110424928A CN102520127A CN 102520127 A CN102520127 A CN 102520127A CN 2011104249289 A CN2011104249289 A CN 2011104249289A CN 201110424928 A CN201110424928 A CN 201110424928A CN 102520127 A CN102520127 A CN 102520127A
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Abstract
The invention discloses a measurement calibration method of a falling number tester. The measurement calibration method comprises the following steps of: putting the tester to be calibrated in an environment at the room temperature of 10-30 DEG C at first, wherein in the calibration process, the temperature change is not beyond 5 DEG C, the room-temperature humidity is controlled within a range of 20-85% RH, and no magnetic field or mechanical vibration is around the environment; and then carrying out the following steps of: 1, calibrating a timer of the falling number tester; 2, calibrating water bath temperature of the falling number tester; 3, calibrating the overall performance of the falling number tester; and 4, processing a measurement result, averaging test results in the first, second and third steps to obtain a test result of the falling number tester. The measurement calibration method disclosed by the invention is used for effectively calibrating the measurement precision of the falling number tester (wave pass 1900) used in the current laboratory, so that negative effects in subsequent production caused by measured incorrect measurement data when the measurement precision of the falling number tester is decreased can be avoided.
Description
Technical field
The present invention relates to number of falls pH-value determination pH appearance, especially relate to the measurement and calibration method of number of falls pH-value determination pH appearance.
Background technology
Number of falls pH-value determination pH appearance is to utilize flour suspending liquid after rapid gelatinization, to receive the effect of AMS and starch is decomposed to liquefy, and the speed of starch liquefacation is exactly the reflection of alpha-amylase activity, can instruct curing of bread according to drop value.But, after laboratory employed number of falls pH-value determination pH appearance (ripple logical 1900) measuring accuracy reduces at present, also do not have complete, practical calibration steps.
Summary of the invention
It is a kind of through combining with the instrument service condition that the object of the invention is to provide, and studies and be applicable to the measurement and calibration method of number of falls pH-value determination pH appearance to the meter characteristic of different parts.
For realizing above-mentioned purpose, the present invention can take following technical proposals:
The measurement and calibration method of number of falls pH-value determination pH appearance of the present invention; The said analyzer that at first will be calibrated places room temperature at 10-30 ℃ environment; Temperature variation is no more than 5 ℃ in the calibration process, and room temperature humidity is controlled in 20%～85%RH scope, does not have magnetic field or mechanical vibration on every side; Carry out according to following step then:
The calibration of the first step, number of falls pH-value determination pH appearance timer
Press the time switch of number of falls pH-value determination pH appearance simultaneously and use stopwatch with the calibration timing, respectively twice of timing 100s, 200s, 300s, 400s; The Chronograph precision is: scale division value is not more than 0.1s; Then according to the time error t of computes number of falls pH-value determination pH appearance timer
c:
In the formula, the time value that t1-said stopwatch is measured; The time value that t2-number of falls pH-value determination pH appearance shows;
The calibration of second step, number of falls pH-value determination pH appearance bath temperature
In the water-bath box of number of falls pH-value determination pH appearance, add the top of distilled water to water level controller, open number of falls pH-value determination pH appearance power switch subsequently and open chilled water; The water-bath device of number of falls pH-value determination pH appearance will heat automatically up to water and seethe with excitement; After the start arm lamp of treating number of falls pH-value determination pH appearance shows stable green glow,, whenever read a secondary data at a distance from 2 minutes with the temperature of thermometer measure water-bath; Continuous coverage 5 times is calculated as follows temperature error Tc then;
In the formula: the temperature value of T-thermometer measure;
The calibration of the 3rd step, number of falls pH-value determination pH appearance complete machine performance
One, the preparation of sample:
1, the preparation of grain sample:
From laboratory sample, obtain the representational sample of 300g, remove the impurity (sandstone, dust, cot or other cereal) in the sample, grind.Sample after before test, will pulverizing at room temperature cools off more than the 1h.Sample after the pulverizing should meet the granule size distribution requirement of following table.
The requirement of wholemeal distribution of particles
| Size of mesh/μ m | Screen underflow/% |
| 710（CQ10） | 100 |
| 500（CQ14） | 95-100 |
| 210-200(CQ30) | ≤80 |
2, flour and coarse dust sample:
The sieve screen flour of available 0.8mm is so that smash caking and remove impurity.Before mixing appearance flour sample is mixed.
For commercially available wholemeal or semolina, for preparation meets the specimen that granule size distributes and requires in the table, application experiment barreling grind away article, all samples after will grinding before the sample determination mixes fully.
Two, calibration operation step
1, at first open number of falls pH-value determination pH appearance power switch and open chilled water, the bright back of pilot lamp is to be measured;
2, take by weighing sample according to the relation of following table sample weighting amount and moisture and place in the testing tube;
3, in said testing tube, add distilled water 25ml; With clean rubber plug plug at the testing tube top; Firmly shaking testing tube makes for 50 times pulverized specimen and water form uniform suspension; Take away rubber plug then; Blow into the test tube edge to all residues, use the viscosity stirrer of a dry cleansing, blow into suspending liquid to any residue attached to test tube wall;
4, testing tube is placed the cartridge internal fixation of stirrer after, the water-bath box boiled water of immediately testing tube and said cartridge being put into number of falls pH-value determination pH appearance is tested;
5, after the test beginning, the display screen counter of number of falls pH-value determination pH appearance automatically resets and begins counting, begins after 5 seconds to stir with the speed of twice of per second; In the time of 60 seconds, starter stops at tip position, and stirrer discharges, and material begins to descend in gelation suspending liquid under himself action of gravity in the testing tube; In the time of 62 seconds, when stirrer drop to regulation apart from the time, electronic unit stops counting, test is accomplished;
6, after measurement finishes, demonstrate the drop value of parallel sample on the display of number of falls pH-value determination pH appearance, be calculated as follows the complete machine performance of number of falls pH-value determination pH appearance, adopt measuring repeatability (2 measurements) RSD
2Expression:
In the formula: the drop value of sample in t1 one testing tube 1, s;
The drop value of sample in t2 one testing tube 2, s;
The mean value of t-drop value, s;
The processing of the 4th step, measurement result
To the mensuration result in first, second and third step with the mensuration result of mean value as number of falls pH-value determination pH appearance.
The invention has the advantages that realization effectively calibrates the measuring accuracy of present laboratory employed number of falls pH-value determination pH appearance (ripple logical 1900); Avoiding when the measuring accuracy of number of falls pH-value determination pH appearance descends, measured inaccurate measurement data is given the adverse consequences that subsequent production caused.
Embodiment
The measurement and calibration method of number of falls pH-value determination pH appearance according to the invention; The said analyzer that at first will be calibrated places room temperature at 10-30 ℃ environment; Temperature variation is no more than 5 ℃ in the calibration process, and room temperature humidity is controlled in 20%～85%RH scope, does not have magnetic field or mechanical vibration on every side; Carry out according to following step then:
The calibration of the first step, number of falls pH-value determination pH appearance timer
Press the time switch of number of falls pH-value determination pH appearance simultaneously and use stopwatch with the calibration timing, respectively twice of timing 100s, 200s, 300s, 400s; The Chronograph precision is: scale division value is not more than 0.1s; Then according to the time error t of computes number of falls pH-value determination pH appearance timer
c:
In the formula, the time value that t1-said stopwatch is measured; The time value that t2-number of falls pH-value determination pH appearance shows;
The calibration of second step, number of falls pH-value determination pH appearance bath temperature
In the water-bath box of number of falls pH-value determination pH appearance, add the top of distilled water to water level controller, open number of falls pH-value determination pH appearance power switch subsequently and open chilled water; The water-bath device of number of falls pH-value determination pH appearance will heat automatically until water and seethe with excitement; After the start arm lamp of treating number of falls pH-value determination pH appearance shows stable green glow,, whenever read a secondary data at a distance from 2 minutes with the temperature of thermometer measure water-bath; Continuous coverage 5 times is calculated as follows temperature error Tc then;
In the formula: the temperature value of T-thermometer measure; The thermometer measure scope is 0-100 ℃, and minimum calibration is not more than 1 ℃;
The calibration of the 3rd step, number of falls pH-value determination pH appearance complete machine performance
One, the preparation of sample:
1, the preparation of grain sample:
From laboratory sample, obtain the representational sample of 300g, remove the impurity (sandstone, dust, cot or other cereal) in the sample, grind.Sample after before test, will pulverizing at room temperature cools off more than the 1h.Sample after the pulverizing should meet the granule size distribution requirement of following table.
The requirement of wholemeal distribution of particles
| Size of mesh/μ m | Screen underflow/% |
| 710（CQ10） | 100 |
| 500（CQ14） | 95-100 |
| 210-200(CQ30) | ≤80 |
2, flour and coarse dust sample:
The sieve screen flour of available 0.8mm is so that smash caking and remove impurity.Before mixing appearance flour sample is mixed.
For commercially available wholemeal or semolina, for preparation meets the specimen that granule size distributes and requires in the table, application experiment barreling grind away article, all samples after will grinding before the sample determination mixes fully.
Two, calibration operation step
1, at first open number of falls pH-value determination pH appearance power switch and open chilled water, the bright back of pilot lamp is to be measured;
2, take by weighing sample according to the relation of following table sample weighting amount and moisture and place in the testing tube;
3, in said testing tube, add distilled water 25ml; With clean rubber plug plug at the testing tube top; Firmly shaking testing tube makes for 50 times pulverized specimen and water form uniform suspension; Take away rubber plug then; Blow into the test tube edge to all residues, use the viscosity stirrer of a dry cleansing, blow into suspending liquid to any residue attached to test tube wall;
4, testing tube is placed the cartridge internal fixation of stirrer after, the water-bath box boiled water of immediately testing tube and said cartridge being put into number of falls pH-value determination pH appearance is tested;
5, after the test beginning, the display screen counter of number of falls pH-value determination pH appearance automatically resets and begins counting, begins after 5 seconds to stir with the speed of twice of per second; In the time of 60 seconds, starter stops at tip position, and stirrer discharges, and material begins to descend in gelation suspending liquid under himself action of gravity in the testing tube; In the time of 62 seconds, when stirrer drop to regulation apart from the time, electronic unit stops counting, test is accomplished;
6, after measurement finishes, demonstrate the drop value of parallel sample on the display of number of falls pH-value determination pH appearance, be calculated as follows the complete machine performance of number of falls pH-value determination pH appearance, adopt measuring repeatability (2 measurements) RSD
2Expression:
In the formula: the drop value of sample in t1 one testing tube 1, s;
The drop value of sample in t2 one testing tube 2, s;
The mean value of t-drop value, s;
The processing of the 4th step, measurement result
To the mensuration result in first, second and third step with the mensuration result of mean value as number of falls pH-value determination pH appearance.
The uncertainty evaluation of this method measurement result and expression should meet the requirement of JJF 1059-1999 " evaluation of uncertainty in measurement and expression ", comprise formula that source and classification thereof, the uncertainty of uncertainty is synthetic and representation etc.
The time interval suggestion of resuming classes of number of falls pH-value determination pH appearance is 1 year; But the length in the time interval is to be determined by factors such as the operating position (using importance, environmental baseline, the frequency of utilization at position) of instrument, user, the quality of instrument own owing to resume classes; Therefore, also can independently determine by the user according to actual operating position.
The repeatability of the method for the invention; Requirement is used identical device in same laboratory by same operator, is undertaken by the same test method; And test same measurand is separate at short notice, twice independent test result's absolute difference should not surpass 10%.
Claims (1)
1. the measurement and calibration method of a number of falls pH-value determination pH appearance; It is characterized in that: the said analyzer that at first will be calibrated places room temperature at 10-30 ℃ environment; Temperature variation is no more than 5 ℃ in the calibration process, and room temperature humidity is controlled in 20%～85%RH scope, does not have magnetic field or mechanical vibration on every side; Carry out according to following step then:
The calibration of the first step, number of falls pH-value determination pH appearance timer
Press the time switch of number of falls pH-value determination pH appearance simultaneously and use stopwatch with the calibration timing, respectively twice of timing 100s, 200s, 300s, 400s; The Chronograph precision is: scale division value is not more than 0.1s; Then according to the time error t of computes number of falls pH-value determination pH appearance timer
c:
In the formula, the time value that t1-said stopwatch is measured; The time value that t2-number of falls pH-value determination pH appearance shows;
The calibration of second step, number of falls pH-value determination pH appearance bath temperature
In the water-bath box of number of falls pH-value determination pH appearance, add the top of distilled water to water level controller, open number of falls pH-value determination pH appearance power switch subsequently and open chilled water; The water-bath device of number of falls pH-value determination pH appearance will heat automatically up to water and seethe with excitement; After the start arm lamp of treating number of falls pH-value determination pH appearance shows stable green glow,, whenever read a secondary data at a distance from 2 minutes with the temperature of thermometer measure water-bath; Continuous coverage 5 times is calculated as follows temperature error Tc then;
In the formula: the temperature value of T-thermometer measure;
The calibration of the 3rd step, number of falls pH-value determination pH appearance complete machine performance
One, the preparation of sample:
1, the preparation of grain sample:
From laboratory sample, obtain the representational sample of 300g, remove sandstone, dust, cot or other cereal impurity in the sample, grind; Sample after before test, will pulverizing at room temperature cools off more than the 1h; Sample after the pulverizing should meet the granule size distribution requirement of following table;
The requirement of wholemeal distribution of particles
2, flour and coarse dust sample:
With the sieve screen flour of 0.8mm, smash caking and remove impurity; Before mixing appearance flour sample is mixed;
For commercially available wholemeal or semolina, for preparation meets the specimen that granule size distributes and requires in the table, with experiment barreling grind away article, all samples after will grinding before the sample determination mixes fully;
Two, calibration operation step
1, at first open number of falls pH-value determination pH appearance power switch and open chilled water, the bright back of pilot lamp is to be measured;
2, take by weighing sample according to the relation of following table sample weighting amount and moisture and place in the testing tube;
3, in said testing tube, add distilled water 25ml; With clean rubber plug plug at the testing tube top; Firmly shaking testing tube makes for 50 times pulverized specimen and water form uniform suspension; Take away rubber plug then; Blow into the test tube edge to all residues, use the viscosity stirrer of a dry cleansing, blow into suspending liquid to any residue attached to test tube wall;
4, testing tube is placed the cartridge internal fixation of stirrer after, testing tube and said cartridge are put into the water-bath box boiled water of number of falls pH-value determination pH appearance and are tested;
5, after the test beginning, the display screen counter of number of falls pH-value determination pH appearance automatically resets and begins counting, begins after 5 seconds to stir with the speed of twice of per second; In the time of 60 seconds, starter stops at tip position, and stirrer discharges, and material begins to descend in gelation suspending liquid under himself action of gravity in the testing tube; In the time of 62 seconds, when stirrer drop to regulation apart from the time, electronic unit stops counting, test is accomplished;
6, after measurement finishes, demonstrate the drop value of parallel sample on the display of number of falls pH-value determination pH appearance, be calculated as follows the complete machine performance of number of falls pH-value determination pH appearance, adopt measuring repeatability (2 measurements) RSD
2Expression:
In the formula: the drop value of sample in t1 one testing tube 1, s;
The drop value of sample in t2 one testing tube 2, s;
The mean value of t-drop value, s;
The processing of the 4th step, measurement result
To the mensuration result in first, second and third step with the mensuration result of mean value as number of falls pH-value determination pH appearance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104249289A CN102520127A (en) | 2011-12-19 | 2011-12-19 | Measurement calibration method of falling number tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104249289A CN102520127A (en) | 2011-12-19 | 2011-12-19 | Measurement calibration method of falling number tester |
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| CN102520127A true CN102520127A (en) | 2012-06-27 |
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| CN2011104249289A Pending CN102520127A (en) | 2011-12-19 | 2011-12-19 | Measurement calibration method of falling number tester |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841505A (en) * | 2017-01-24 | 2017-06-13 | 郑州良源分析仪器有限公司 | Full-automatic sedimentation Meter and solvable assessment of indices method |
| CN108362559A (en) * | 2018-01-06 | 2018-08-03 | 河南德瀚新材料科技有限公司 | Dough tensile instrument measurement calibration method |
| CN108362823A (en) * | 2018-01-06 | 2018-08-03 | 河南德瀚新材料科技有限公司 | Farinograph measurement calibration method |
| CN111678830A (en) * | 2020-06-17 | 2020-09-18 | 中检(河南)计量检测有限公司 | Calibration method of dough stretching instrument |
-
2011
- 2011-12-19 CN CN2011104249289A patent/CN102520127A/en active Pending
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| 段慧明: "《液体流量标准装置和标准表法流量标准装置》", 31 July 2004, 中国计量出版社 * |
| 水力发电厂技术标准: "《水力发电厂技术标准汇编 第9卷 电能质量与计量标准》", 31 July 2002, 中国电力出版社 * |
| 王肇慈: "《粮油食品品质分析》", 30 April 2000, 中国轻工业出版社 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841505A (en) * | 2017-01-24 | 2017-06-13 | 郑州良源分析仪器有限公司 | Full-automatic sedimentation Meter and solvable assessment of indices method |
| CN106841505B (en) * | 2017-01-24 | 2019-03-15 | 郑州良源分析仪器有限公司 | Full-automatic sedimentation Meter and solvable assessment of indices method |
| CN108362559A (en) * | 2018-01-06 | 2018-08-03 | 河南德瀚新材料科技有限公司 | Dough tensile instrument measurement calibration method |
| CN108362823A (en) * | 2018-01-06 | 2018-08-03 | 河南德瀚新材料科技有限公司 | Farinograph measurement calibration method |
| CN111678830A (en) * | 2020-06-17 | 2020-09-18 | 中检(河南)计量检测有限公司 | Calibration method of dough stretching instrument |
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Application publication date: 20120627 |