CN116466052A - Online detection structure and online detection method for purified water system sensor - Google Patents
Online detection structure and online detection method for purified water system sensor Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000008213 purified water Substances 0.000 title claims abstract description 52
- 230000001681 protective effect Effects 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 11
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 74
- 238000005259 measurement Methods 0.000 claims description 54
- 229910052697 platinum Inorganic materials 0.000 claims description 37
- 238000009827 uniform distribution Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 claims description 7
- 238000013016 damping Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 6
- 230000000737 periodic effect Effects 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 claims description 6
- 238000012795 verification Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 239000013256 coordination polymer Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000009529 body temperature measurement Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000012498 ultrapure water Substances 0.000 description 4
- 239000008215 water for injection Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011071 total organic carbon measurement Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1826—Organic contamination in water
- G01N33/1846—Total carbon analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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Abstract
The invention discloses an online detection structure and an online detection method for a purified water system sensor, wherein the sensor comprises a temperature measuring element, a temperature measuring extension rod and a junction box which are coaxially connected; the on-line detection structure is provided with an outer protective sleeve; the temperature measuring element and the temperature measuring extension rod are inserted into the outer protective sleeve; the temperature measurement extension rod is connected with the outer protection sleeve through the junction box; the outer protective sleeve is fixedly arranged on a pipeline of purified water system equipment through a sleeve fixing piece. By adopting the technical scheme, the integrated online metering detection is realized, the accuracy and reliability of the sensor quantity value of the purified water system are ensured, the accuracy of temperature parameters is ensured, and the product is ensured to reach the international and domestic water quality standard; the temperature sensing element of the sensor and the outer protective sleeve are convenient to connect and insert and mount, and the metering detection is convenient and quick; meanwhile, other media are prevented from entering in the detection process, so that the pollution to water quality is avoided, and the continuous and normal operation of the production process is ensured.
Description
Technical Field
The invention belongs to the technical field of metering and testing of biochemical, thermal and fluid detection instruments and equipment. More particularly, the present invention relates to an on-line detection structure applied to a purified water system sensor, and an on-line detection method thereof.
Background
Water purity standards are used for purified water, high purity water, water for injection, and purified steam in pharmaceutical manufacturing processes worldwide. Domestic and international regulatory authorities include: the chinese pharmacopoeia (CHP), the United States Pharmacopoeia (USP), the European Pharmacopoeia (EP), the Japanese Pharmacopoeia (JP), the Indian Pharmacopoeia (IP) have established water quality standards for purified water and other grades of water.
Various sensors are widely used in the production, transportation and distribution processes of purified water, high purity water, water for injection, and purified steam, and in liquid distribution systems. Whether the magnitude of the sensor is accurate or not has great influence on the stability of the technological process and the product quality of pharmaceutical enterprises. Among other things, temperature is a critical measurement parameter in conductivity, total Organic Carbon (TOC) measurements that characterize water quality. So whether the temperature sensor is accurate or not is related to the technological process and the product quality of pharmaceutical enterprises.
After a period of time, the sensors need to be measured and tested for calibration, namely, in a standard state, the sensors are measured and tested for preventing deviation of detection data after a period of time.
However, the existing metering detection technology has the following problems and defects:
at present, the measurement and detection of a temperature sensor in a purified water production system in China generally needs to be carried out according to JJF1183-2007 'calibration standard of a temperature transmitter' and JJF 229-2010 'industrial platinum and copper thermal resistors', the temperature sensor needs to be disassembled, and the temperature sensor can be installed and reduced after the detection is finished, so that the time and the labor are wasted, and the risk of pollution to a pipeline system is brought;
when the measurement, calibration and detection are carried out, a production line is usually stopped to implement the detection, the online detection cannot be realized, the normal production is seriously influenced, the production efficiency is reduced, and the quality of a product is also adversely affected;
because the temperature sensors in the production workshop are scattered and cannot be measured and detected at the same time, the detection time is far longer than the conventional stop time of enterprises, the rhythm and continuity of medicine production are seriously affected, and huge economic loss is caused;
many enterprises cannot periodically detect the online temperature sensor and other various sensors according to the standard and specification requirements, or reduce the detection frequency, increase the difficulty of quality management in the production process, and increase the risk of difficult control of the product quality.
Disclosure of Invention
The invention provides an online detection method applied to a purified water system sensor, and aims to realize integrated online metering detection of the sensor.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention relates to an online detection structure of a purified water system sensor, which comprises a temperature measuring element, a temperature measuring extension rod and a junction box which are coaxially connected; the online detection structure is provided with an outer protection sleeve; the temperature measuring element and the temperature measuring extension rod are inserted into the outer protective sleeve; the temperature measurement extension rod is connected with the outer protection sleeve through the junction box; the outer protection sleeve is fixedly arranged on a pipeline of purified water system equipment through a sleeve fixing piece.
The connecting structure of the junction box and the sleeve fixing piece adopts a quick assembly and disassembly structure.
The quick assembly and disassembly structure adopts an elastic buckle structure or a long screw connecting structure sleeved with a spiral spring.
The outer protective sleeve is made of a corrosion-resistant and high-temperature-resistant metal material.
The inner end part of the temperature measuring element adopts an arc guiding structure.
A damping pad is arranged in a gap between the temperature measuring extension rod and the outer protective sleeve; the damping pad is arranged at the port of one end of the temperature measuring element, which faces to the insertion direction, and is provided with a pad guiding taper.
The junction of the sleeve fixing piece and the outer end part of the outer protective sleeve is provided with a temperature measuring element installation guiding taper.
When the online detection structure is expanded to detect pH, TOC and conductivity, the sensor adopts one or a combination of any more of a temperature measuring element, a pH sensor, a TOC sensor and a conductivity sensor.
When the online detection structure is used for detecting pH, TOC and conductivity, a plurality of small holes are arranged at positions corresponding to the sensors on the outer protection sleeve; or a through hole is arranged at the inner end part of the outer protective sleeve, so that the sensor penetrates out of the outer protective sleeve from the through hole.
The purified water system combines the ZigBee technology and the sensor technology, transmits information acquired by the sensor to the gateway in a wireless communication mode, and uploads data to the CP machine through a serial port, so that the functions of sensor data acquisition and monitoring are realized.
In order to achieve the same object as the technical scheme, the invention also provides an online detection method applied to the online detection structure of the purified water system sensor, which comprises the following metering detection processes:
(1) Opening the junction box, breaking the lead, and extracting the temperature measuring element and the temperature measuring extension rod of the sensor to separate the temperature measuring element and the temperature measuring extension rod from the outer protective sleeve in a normal production process; at this time, the outer protective sleeve is still assembled on the pipeline of the purified water system equipment, and is not contacted with the outside, so that pollution is not caused;
(2) Reconnecting the detached temperature measuring element with a wire through a junction box, and placing the wire in a constant temperature tank or a dry body furnace of electrical measurement equipment for independent measurement; heating to a set temperature, and the electrical measurement equipment can read the data of the temperature measuring element again;
(3) Comparing the detected data, and performing experimental verification: data difference between two states of the outer protective sleeve and the non-outer protective sleeve;
if the influence of the outer protective sleeve on the measurement data is small, the measurement uncertainty introduced in the state without the outer protective sleeve is calculated through experiments;
if the influence of the outer protective sleeve on the measured data is large, customizing the outer protective sleeve with the same specification for the same temperature sensor, inserting the temperature measuring element into the customized outer protective sleeve after the temperature measuring element is pulled out from a pipeline of the purified water system equipment, simulating the measuring state in the pipeline of the purified water system equipment, and performing metering detection;
(4) And after the measurement and detection are finished, reinserting the temperature measuring element and the temperature measuring extension rod into an outer protective sleeve on a pipeline of the purified water system equipment, connecting and fixing the connecting wires, and recovering the normal on-line detection.
If the sensor is positioned at a higher position of the purified water system equipment, the constant temperature equipment for detection is inconvenient to use, and for the three-wire heating resistor most commonly used in industry, the same material and the same length of extension wires are adopted to connect the temperature measuring element and the electrical measuring equipment, so that the influence caused by unequal arms of the circuit can be basically eliminated, and meanwhile, the inconvenience brought by lifting and carrying of the constant temperature equipment is avoided.
The uncertainty of the indication error of the detection method is evaluated in the following way:
(1) The basic requirements are as follows:
(1.1), measuring environmental conditions: the temperature is 15.0-35.0 ℃, and the relative humidity is not more than 85 percent;
(1.2), measurement standard instrument: standard platinum resistance thermometer, matched electric measuring instrument, liquid constant temperature tank and water three-phase point bottle;
(1.3), the object to be measured: an integrated on-line temperature sensor;
(1.4), measurement method: the method comprises the steps that a comparison method is adopted, an integrated on-line temperature sensor to be detected and a standard platinum resistance thermometer are placed in the same temperature field, an indication value is obtained and an indication value of the standard platinum resistance thermometer is adopted, and an indication value error is calculated according to a formula;
(2) And (3) measuring a model:
Δt＝t i -t b
wherein:
Δt- -the error in the indication of the detected integrated on-line temperature sensor, DEG C;
t i -an indication of the detected integrated on-line temperature sensor, -c;
t b -the actual temperature value of the thermostatic bath, i.e. the measured value of a standard platinum resistance thermometer expressed in terms of temperature, °c;
(3) Variance and sensitivity coefficient:
variance:
wherein, the sensitivity coefficient:
(4) Evaluation of the standard uncertainty component:
(4.1), input quantity t of detected integrated online temperature sensor i The method comprises the steps of carrying out a first treatment on the surface of the Introduced standard uncertainty u (ti) ；
(4.1.1), uncertainty component u introduced by repeatability of the glass thermometer to be tested 1 ；
Under the condition of repeatability, continuously measuring the detected integrated online temperature sensor for 10 times at the temperature of 25.0 ℃ to obtain a temperature value of a measuring column;
according to the Bessel formula, calculating to obtain a standard deviation s (t) =0.067 ℃;
the average value of the two measurements is actually taken as the measurement result, so:
(4.1.2), and is integrally inspectedUncertainty component u introduced by difference of protective sleeves of chemical online temperature sensor 2 ；
The temperature difference of the protection sleeve of the detected JUMO manufacturer 902120/10 type temperature sensor is not more than 0.2 ℃ through experiments, and the temperature difference is subject to uniform distribution, and then:
(4.2) from the actual temperature value t of the thermostatic bath b Introduced standard uncertainty u (tb) ；
(4.2.1), uncertainty component u introduced by standard platinum resistance thermometer value traceability 3 ：
Uncertainty of second-class standard platinum resistance thermometer at 25 ℃ is 0.0048 ℃, k=2, then:
u 3 ＝0.0048/2＝0.0024℃
(4.2.2), uncertainty component u introduced by the periodic stability of a standard platinum resistance thermometer 4 ：
The periodic stability of the standard platinum resistance thermometer is not more than 10mK, and the standard platinum resistance thermometer is subjected to uniform distribution, and then:
(4.2.3), uncertainty component u introduced by the standard platinum resistance thermometer self-heating effect 5 ：
The standard platinum resistance thermometer is self-heated to a maximum of not more than 4mK in the verification process and is subjected to uniform distribution, and then:
(4.2.4), uncertainty component u introduced by the electrical measurement device 6 ：
The maximum relative error of the electrical measurement equipment is (+/-) (5 multiplied by 10) -5 ) The resistance of a standard platinum resistance thermometer at 37℃is about 27.97. OMEGA, the resistance is equal toThe rate of change of temperature is about 0.1 Ω/°c, and the standard uncertainty introduced by the measurement error of the electrical measurement device obeys a uniform distribution, then:
(4.2.5), uncertainty component u introduced by oven uniformity 7 ：
The maximum temperature difference of the working area of the constant temperature tank is 0.01 ℃, the half width of the interval is 0.005 ℃ and the working area is uniformly distributed
(4.2.6) uncertainty component u introduced by oven uniformity 8 ：
The fluctuation degree of the constant temperature tank is not more than +/-0.01 ℃/10min, the interval half width is 0.01 ℃, and the constant temperature tank is uniformly distributed, and then:
(5) Standard uncertainty:
synthesis standard uncertainty calculation:
the components are mutually independent, and standard uncertainty is synthesized by adopting a square root method:
(6) Extended uncertainty:
at 25.0 ℃, the uncertainty is expanded in measurement of the indication error of the detected integrated online temperature sensor:
U＝k×u c ＝2×0.08＝0.16℃，k＝2
according to the principle that the measurement uncertainty is better than the allowable error of the measured object by 1/3, when the allowable error requirement of the temperature sensor is not more than +/-0.5 ℃, the measurement detection method can be adopted.
By adopting the technical scheme, the integrated online metering detection is realized, the accuracy and reliability of the sensor quantity value of the purified water system are ensured, the accuracy of temperature parameters is ensured, and the purified water, high-purity water, water for injection and pure steam in the production process are ensured to reach the international and domestic water quality standard; the temperature sensing element of the sensor and the outer protective sleeve are convenient to connect and insert and mount, and the metering detection is convenient and quick; meanwhile, other media are prevented from entering in the detection process, so that the pollution to water quality is avoided, the continuous and normal operation of the production process is ensured, and the method has high social and economic benefits.
Drawings
The contents of the drawings and the marks in the drawings are briefly described as follows:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged scale schematic diagram of the structure at A in FIG. 1;
FIG. 3 is a schematic view of the structure of the guide taper of the temperature measuring element in the present invention;
fig. 4 is a schematic view of the structure of the sensor penetrating out of the outer protective sleeve according to the present invention.
Marked in the figure as:
1. the junction box, 2, lead-out wire sealing sleeve, 3, fastening bolt, 4, temperature measuring element, 5, outer protective sleeve, 6, sleeve fixing piece, 7, temperature measuring extension rod, 8, circular arc guide structure, 9, shock attenuation liner, 10, liner guide taper, 11, temperature measuring element installation guide taper, 12, visor, 13, protective sheath seal.
Detailed Description
The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate, and thorough understanding of the inventive concepts and aspects of the invention by those skilled in the art.
The structure of the invention as shown in fig. 1 is an on-line detection method applied to a purified water system sensor, wherein the sensor comprises a temperature measuring element 4, a temperature measuring extension rod 7 and a junction box 1 which are coaxially connected.
Since the temperature to be measured is located relatively inside the pipe or device, the temperature measuring element 4 is required to extend a long distance from outside to inside, and thus its total length is relatively large, which needs to be determined according to the specific size of the pipe or device.
In order to solve the problems existing in the prior art and overcome the defects thereof and realize the aim of the integrated on-line metering detection of the sensor, the invention adopts the following technical scheme:
as shown in fig. 1, the online detection structure of the purified water system sensor of the invention is provided with an outer protection sleeve 5; the temperature measuring element 4 and the temperature measuring extension rod 7 are inserted into the outer protective sleeve 5; the temperature measuring extension rod 7 is connected with the outer protective sleeve 5 through the junction box 1; the outer protective sleeve 5 is fixedly arranged on a pipeline of purified water system equipment through a sleeve fixing piece 6.
The junction box 1 is arranged in the sleeve fixing piece 6 and is fixedly arranged through the fastening bolt 3; a protective cover 12 is arranged at the opening of the sleeve fixing piece 6 for sealing;
the temperature measuring extension rod 7 is a longer hollow pipe fitting, the temperature measuring element 4 is connected with a signal wire, the signal wire passes through the hollow temperature measuring extension rod 7 and is connected to the junction box 1, and then the signal wire is connected with a testing instrument through the outgoing line sealing sleeve 2 arranged on the sleeve fixing piece 6.
When the measuring and detecting of the sensor are carried out, the thermal resistor insert core of the assembled temperature sensor is extracted and connected with the extension lead, so that the integrated online measurement is realized, the accuracy of temperature parameters is ensured, and purified water, high-purity water, water for injection and pure steam in the production process of pharmacy and the like are ensured to reach the water quality standard of domestic and international regulatory authorities.
Therefore, the invention improves and innovates the structure of the traditional assembly type temperature sensor, so that the temperature sensing element of the sensor and the outer protection tube are convenient to be connected and inserted; the push type wire binding post is used for replacing a screw binding post, so that the push type wire binding post is more suitable for the requirements of a novel metering detection method; by designing the telescopic sensor protection sleeve, other media in the production process are prevented from entering, the sensor is protected, and the online metering of the pH sensor, the TOC sensor and the conductivity sensor is realized.
The outer protective sleeve 5 can realize the disassembly and the installation of the sensor at any time; when the sensor is detected, cleaned, calibrated or replaced, the production process is not required to be interrupted, the production efficiency is improved, and the production continuity is ensured. The thermal resistor plug core of the temperature sensor is convenient to install, stable and shock-resistant, and convenient to connect and insert wires. Through online detection, the accurate and reliable sensor value of the purified water system is ensured, and the method has high social and economic benefits.
Taking assembled thermal resistor as an example, the thermal resistor consists of a temperature sensing element, an outer protection tube, a junction box and fixing devices for various purposes, and has two specifications of single-branch and double-branch elements, and the outer protection sleeve 5 has corrosion resistance and enough mechanical strength, so that the product can be safely used in various occasions.
In order to improve the detection efficiency, reduce the time of disassembly and assembly of the temperature measuring element and ensure the normal operation of production, the invention adopts the following measures:
the connecting structure of the junction box 1 and the sleeve fixing piece 6 adopts a quick assembly and disassembly structure.
The specific implementation adopts one of the following two schemes:
1. the quick assembly and disassembly structure adopts an elastic buckle structure;
2. the quick assembly and disassembly structure adopts a long screw rod connecting structure sleeved with a spiral spring.
In order to ensure the normal operation of the temperature measuring element 4 and prolong the service lives of the temperature measuring element 4 and the outer protective sleeve 5, the outer protective sleeve 5 is made of a corrosion-resistant and high-temperature-resistant metal material.
The inner end part of the temperature measuring element 4 adopts an arc guiding structure 8.
The end part of the temperature measuring element 4 adopts an arc guiding structure, and can play a good guiding role, and the other end part of the temperature measuring element adopts an arc guiding structure. Can avoid the collision damage easily occurring at the end part of the acute angle.
Because the temperature measuring element 4 and the temperature measuring extension rod 7 thereof leave a certain gap with the outer protective sleeve 5, in order to ensure the stability of the temperature measuring element 4 and the temperature measuring extension rod 7 thereof, the following measures are adopted:
as shown in fig. 2:
a damping pad 9 is arranged in a gap between the temperature measuring extension rod 7 and the outer protective sleeve 5; the damping pad 9 faces to a port at one end of the insertion direction of the temperature measuring element 4, and a pad guiding taper 10 is arranged.
The shock absorption pad 9 is made of flexible materials with certain toughness, and also has certain high temperature resistance. Such as polytetrafluoroethylene, etc.
As is found in fig. 3:
the junction of the sleeve fixing piece 6 and the outer end part of the outer protective sleeve 5 is provided with a temperature measuring element installation guiding taper 11.
The guide taper 11 is arranged on the temperature measuring element, so that the temperature measuring element 4 and the temperature measuring extension rod 7 can be smoothly inserted into the outer protective sleeve 5.
When the online detection structure is expanded to detect pH, TOC and conductivity, the sensor adopts one or a combination of any more of a temperature measuring element 4, a pH sensor, a TOC sensor and a conductivity sensor.
When the online detection structure is used for detecting pH, TOC and conductivity, a plurality of small holes are arranged at the positions corresponding to the sensors on the outer protection sleeve 5;
alternatively, as shown in fig. 4, a through hole is provided at the inner end of the outer protection sleeve 5 such that the sensor passes out of the outer protection sleeve 5 through the through hole.
The above measures are used because, when the in-line detection structure is used for detecting pH, TOC, conductivity, the sensor needs to be in contact with the corresponding liquid or gas, but cannot leak it.
At this time, the protective sleeve seal 13 is arranged at the through hole, and a rubber sealing material is adopted to ensure the sealing effect.
In order to improve the monitoring effect and efficiency, the invention also adopts the following measures:
the purified water system combines the ZigBee technology and the sensor technology, transmits information acquired by the sensor to the gateway in a wireless communication mode, and uploads data to the CP machine through a serial port, so that the functions of sensor data acquisition and monitoring are realized. The method is applied to the data acquisition and monitoring of the sensor in the purified water workshop.
The method realizes the network transmission of data, remote control and centralized control of the production process, and improves the level of enterprise management.
In order to achieve the same object as the technical scheme, the invention also provides an online detection method applied to the online detection structure of the purified water system sensor, which comprises the following metering detection processes:
1) Opening the junction box 1, disconnecting the lead, and extracting the temperature measuring element 4 (thermal resistor insert) and the temperature measuring extension rod 7 of the sensor to separate the temperature measuring element and the temperature measuring extension rod from the outer protection sleeve 5 in a normal production process; at this time, the outer protective sleeve 5 is still assembled on the pipeline of the purified water system equipment, and is not contacted with the outside, so that pollution is not caused;
2) Reconnecting the detached temperature measuring element 4 with a wire through the junction box 1, and placing the wire in a constant temperature tank or a dry body furnace of electrical measurement equipment for independent measurement; heating to a set temperature, and the electrical measurement equipment can read the data of the temperature measuring element 4 again;
3) Comparing the detected data, and performing experimental verification: the data difference between the two states with and without the outer protective sleeve 5;
if the influence of the outer protective sleeve 5 on the measurement data is small, the measurement uncertainty introduced in the state without the outer protective sleeve 5 is calculated through experiments;
if the influence of the outer protective sleeve 5 on the measured data is large, customizing the outer protective sleeve 5 with the same specification for the same temperature sensor, inserting the temperature measuring element 4 into the customized outer protective sleeve 5 after the temperature measuring element is pulled out from a pipeline of the purified water system equipment, simulating the measuring state in the pipeline of the purified water system equipment, and performing metering detection;
4) And after the measurement and detection are finished, reinserting the temperature measuring element 4 and the temperature measuring extension rod 7 into the outer protective sleeve 5 on the pipeline of the purified water system equipment, connecting and fixing the reconnection lead, and recovering the normal online detection.
If the sensor is located at a higher position (such as a tank top and the like) of the purified water system equipment, the constant temperature equipment for detection is inconvenient to use, and for the three-wire heating resistor most commonly used in industry, the same material and the same length of extension wire are adopted to connect the temperature measuring element 4 with the electrical measurement equipment, so that the influence caused by unequal arms of the circuit can be basically eliminated, and meanwhile, the inconvenience brought by lifting and carrying of the constant temperature equipment is avoided.
The method is used for carrying out integrated on-line detection on the temperature sensor, and the uncertainty of the indication error is evaluated as follows:
(1) The basic requirements are as follows:
(1.1), measuring environmental conditions: the temperature is 15.0-35.0 ℃, and the relative humidity is not more than 85 percent;
(1.2), measurement standard instrument: standard platinum resistance thermometer, matched electric measuring instrument, liquid constant temperature tank and water three-phase point bottle;
(1.3), the object to be measured: an integrated on-line temperature sensor;
(1.4), measurement method: the method comprises the steps that a comparison method is adopted, an integrated on-line temperature sensor to be detected and a standard platinum resistance thermometer are placed in the same temperature field, an indication value is obtained and an indication value of the standard platinum resistance thermometer is adopted, and an indication value error is calculated according to a formula;
(2) And (3) measuring a model:
△t＝t i －t b
wherein:
deltat-the error of the indication value of the detected integrated on-line temperature sensor, DEG C;
t i -an indication of the detected integrated on-line temperature sensor, -c;
t b -the actual temperature value of the thermostatic bath, i.e. the measured value of a standard platinum resistance thermometer expressed in terms of temperature, °c;
(3) Variance and sensitivity coefficient:
variance:
wherein, the sensitivity coefficient:
(4) Evaluation of the standard uncertainty component:
(4.1), input quantity t of detected integrated online temperature sensor i The method comprises the steps of carrying out a first treatment on the surface of the Introduced standard uncertainty u (ti) ；
(4.1.1), uncertainty component u introduced by repeatability of the glass thermometer to be tested 1 ；
Under the condition of repeatability, the detected integrated online temperature sensor is continuously measured for 10 times at the temperature of 25.0 ℃ to obtain the temperature value (DEG C) of a measuring column:
| measurement array | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Actual measurement value | 25.1 | 25.2 | 25.2 | 25.1 | 25.1 | 25.0 | 25.1 | 25.0 | 25.1 | 25.1 |
According to the Bessel formula, calculating to obtain a standard deviation s (t) =0.067 ℃;
the average value of the two measurements is actually taken as the measurement result, so:
(4.1.2), uncertainty component u introduced by difference of detected integrated on-line temperature sensor protective sleeve 2 ；
The temperature difference of the protection sleeve of the detected JUMO manufacturer 902120/10 type temperature sensor is not more than 0.2 ℃ through experiments, and the temperature difference is subject to uniform distribution, and then:
(4.2) from the actual temperature value t of the thermostatic bath b Introduced standard uncertainty u (tb) ；
(4.2.1), uncertainty component u introduced by standard platinum resistance thermometer value traceability 3 ：
Uncertainty of the second-class standard platinum resistance thermometer at 25 ℃ is 0.0048 ℃ (k=2), then:
u 3 ＝0.0048/2＝0.0024℃
(4.2.2), uncertainty component u introduced by the periodic stability of a standard platinum resistance thermometer 4 ：
The periodic stability of the standard platinum resistance thermometer is not more than 10mK, and the standard platinum resistance thermometer is subjected to uniform distribution, and then:
(4.2.3), uncertainty component u introduced by the standard platinum resistance thermometer self-heating effect 5 ：
The standard platinum resistance thermometer is self-heated to a maximum of not more than 4mK in the verification process and is subjected to uniform distribution, and then:
(4.2.4), uncertainty component u introduced by the electrical measurement device 6 ：
The maximum relative error of the electrical measurement equipment is (+/-) (5 multiplied by 10) -5 ) The standard platinum resistance thermometer has a resistance value of about 27.97 omega at 25 ℃, the rate of change of the resistance and the temperature is about 0.1 omega/°c, and standard uncertainty introduced by measurement errors of electrical measurement equipment is subject to uniform distribution, so that:
(4.2.5), uncertainty component u introduced by oven uniformity 7 ：
The maximum temperature difference of the working area of the constant temperature tank is 0.01 ℃, the interval half width is 0.005 ℃, and the working area is uniformly distributed, so that:
(4.2.6) uncertainty component u introduced by oven uniformity 8 ：
The fluctuation degree of the constant temperature tank is not more than +/-0.01 ℃/10min, the interval half width is 0.01 ℃, and the constant temperature tank is uniformly distributed, and then:
(5) Standard uncertainty:
(5.1) main standard uncertainty summary table:
(5.2), calculation of uncertainty of synthesis standard:
the components are mutually independent, and standard uncertainty is synthesized by adopting a square root method:
(6) Extended uncertainty:
at 25.0 ℃, the uncertainty is expanded in measurement of the indication error of the detected integrated online temperature sensor:
U＝k×u c ＝2×0.08＝0.16℃，k＝2
according to the principle that the measurement uncertainty is better than the allowable error of the measured object by 1/3, when the allowable error of the temperature sensor is not more than +/-0.5 ℃, the metering detection method can be adopted.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the above embodiments, but is capable of being modified or applied directly to other applications without modification, as long as various insubstantial modifications of the method concept and technical solution of the invention are adopted, all within the scope of the invention.
Claims (10)
1. An online detection structure of a purified water system sensor comprises a temperature measuring element (4), a temperature measuring extension rod (7) and a junction box (1) which are coaxially connected; the method is characterized in that: the online detection structure is provided with an outer protection sleeve (5); the temperature measuring element (4) and the temperature measuring extension rod (7) are inserted into the outer protective sleeve (5); the temperature measuring extension rod (7) is connected with the outer protection sleeve (5) through the junction box (1); the outer protection sleeve (5) is fixedly arranged on a pipeline of purified water system equipment through a sleeve fixing piece (6).
2. The purified water system sensor on-line measuring structure according to claim 1, wherein: the connecting structure of the junction box (1) and the sleeve fixing piece (6) adopts a quick assembly and disassembly structure.
3. The on-line detecting structure of purified water system sensor according to claim 2, wherein: the quick assembly and disassembly structure adopts an elastic buckle structure or a long screw connecting structure sleeved with a spiral spring.
4. The purified water system sensor on-line measuring structure according to claim 1, wherein: the inner end part of the temperature measuring element (4) adopts an arc guiding structure (8).
5. The purified water system sensor on-line measuring structure according to claim 1, wherein: a damping liner (9) is arranged in a gap between the temperature measuring extension rod (7) and the outer protective sleeve (5); the damping pad (9) faces to a port at one end of the insertion direction of the temperature measuring element (4), and a pad guiding taper (10) is arranged.
6. The purified water system sensor on-line measuring structure according to claim 1, wherein: when the online detection structure is expanded to detect pH, TOC and conductivity, the sensor adopts one or a combination of any more of a temperature measuring element (4), a pH sensor, a TOC sensor and a conductivity sensor.
7. The purified water system sensor on-line measuring structure according to claim 1, wherein: the purified water system combines the ZigBee technology and the sensor technology, transmits information acquired by the sensor to the gateway in a wireless communication mode, and uploads data to the CP machine through a serial port, so that the functions of sensor data acquisition and monitoring are realized.
8. An on-line detection method applied to the on-line detection structure of the purified water system sensor according to any one of claims 1 to 7, characterized in that: the metering detection process of the online detection method is as follows:
1) Opening the junction box (1) in a normal production process, disconnecting the lead, and extracting the temperature measuring element (4) and the temperature measuring extension rod (7) of the sensor to separate the temperature measuring element and the temperature measuring extension rod from the outer protective sleeve (5); at the moment, the outer protective sleeve (5) is still assembled on a pipeline of purified water system equipment, and is not contacted with the outside, so that pollution is not caused;
2) Reconnecting the detached temperature measuring element (4) with a lead through a junction box (1), and placing the lead in a constant temperature tank or a dry body furnace of electrical measurement equipment for independent measurement; heating to a set temperature, and the electrical measurement equipment can read the data of the temperature measuring element (4) at the moment again;
3) Comparing the detected data, and performing experimental verification: the data difference between the two states of the outer protective sleeve (5) and the non-outer protective sleeve (5);
if the influence of the outer protective sleeve (5) on the measured data is small, the measurement uncertainty introduced in the state without the outer protective sleeve (5) is calculated through experiments;
if the influence of the outer protective sleeve (5) on the measured data is large, customizing the outer protective sleeve (5) with the same specification for the same temperature sensor, inserting the temperature measuring element (4) into the customized outer protective sleeve (5) after the temperature measuring element is pulled out from a pipeline of the purified water system equipment, simulating the measuring state in the pipeline of the purified water system equipment, and performing metering detection;
4) And after the measurement and detection are finished, reinserting the temperature measuring element (4) and the temperature measuring extension rod (7) into the outer protection sleeve (5) on the pipeline of the purified water system equipment, connecting and fixing the reconnection lead, and recovering the normal online detection.
9. The on-line detection method for on-line detection structure of purified water system sensor according to claim 8, wherein: if the sensor is positioned at a higher position of the purified water system equipment, the constant temperature equipment for detection is inconvenient to use, and for the three-wire heating resistor most commonly used in industry, the same material and the same length of extension wires are adopted to connect the temperature measuring element (4) and the electrical measurement equipment, so that the influence caused by different arms of the circuit can be basically eliminated, and meanwhile, the inconvenience brought by lifting and carrying of the constant temperature equipment is avoided.
10. The on-line detection method for on-line detection structure of purified water system sensor according to claim 8, wherein: the uncertainty of the indication error of the detection method is evaluated in the following way:
1) The basic requirements are as follows:
1.1 Measuring environmental conditions): the temperature is 15.0-35.0 ℃, and the relative humidity is not more than 85 percent;
1.2 A measurement standard instrument): standard platinum resistance thermometer, matched electric measuring instrument, liquid constant temperature tank and water three-phase point bottle;
1.3 A measured object): an integrated on-line temperature sensor;
1.4 A) measuring method: the method comprises the steps that a comparison method is adopted, an integrated on-line temperature sensor to be detected and a standard platinum resistance thermometer are placed in the same temperature field, an indication value is obtained and an indication value of the standard platinum resistance thermometer is adopted, and an indication value error is calculated according to a formula;
2) And (3) measuring a model:
△t＝t i －t b
wherein:
deltat-the error of the indication value of the detected integrated on-line temperature sensor, DEG C;
t i -an indication of the detected integrated on-line temperature sensor, -c;
t b -the actual temperature value of the thermostatic bath, i.e. the measured value of a standard platinum resistance thermometer expressed in terms of temperature, °c;
3) Variance and sensitivity coefficient:
variance:
wherein, the sensitivity coefficient:
4) Evaluation of the standard uncertainty component:
4.1 Input quantity t of detected integrated online temperature sensor) i The method comprises the steps of carrying out a first treatment on the surface of the Introduced standard uncertainty u (ti) ；
4.1.1 An uncertainty component u introduced by repeatability of the detected glass thermometer 1 ；
Under the condition of repeatability, continuously measuring the detected integrated online temperature sensor for 10 times at the temperature of 25.0 ℃ to obtain a temperature value of a measuring column;
calculating to obtain standard deviation s (t) according to a Bessel formula;
the average value of the two measurements is actually taken as the measurement result, so:
4.1.2 Uncertainty component u introduced by difference of detected integrated online temperature sensor protective jackets 2 ；
The temperature difference of the detected 902120/10 type temperature sensor protective sleeve is not more than 0.2 ℃ through experiments, and the temperature difference is subjected to uniform distribution, and then:
4.2 From the actual temperature value t of the thermostatic bath) b Introduced standard uncertainty u (tb) ；
4.2.1 A) uncertainty component u introduced by standard platinum resistance thermometer value tracing 3 ：
Uncertainty of second-class standard platinum resistance thermometer at 25 ℃ is 0.0048 ℃, k=2, then:
u 3 ＝0.0048/2＝0.0024℃
4.2.2 Uncertainty component u introduced by the periodic stability of standard platinum resistance thermometer 4 ：
The periodic stability of the standard platinum resistance thermometer is not more than 10mK, and the standard platinum resistance thermometer is subjected to uniform distribution, and then:
4.2.3 Uncertainty component u introduced by standard platinum resistance thermometer self-heating effect) 5 ：
The standard platinum resistance thermometer is self-heated to a maximum of not more than 4mK in the verification process and is subjected to uniform distribution, and then:
4.2.4 Uncertainty component u) introduced by an electrical measurement device 6 ：
The maximum relative error of the electrical measurement equipment is (+/-) (5 multiplied by 10) -5 ) The resistance value of the standard platinum resistance thermometer at 25 ℃ is 27.97 omega, the change rate of the resistance and the temperature is 0.1 omega/DEG C, and the standard uncertainty introduced by the measurement error of the electrical measurement equipment is subject to uniform distribution, so that:
4.2.5 Uncertainty component u introduced by oven uniformity) 7 ：
The maximum temperature difference of the working area of the constant temperature tank is 0.01 ℃, the half width of the interval is 0.005 ℃ and the working area is uniformly distributed
4.2.6 Uncertainty component u introduced by oven uniformity) 8 ：
The fluctuation degree of the constant temperature tank is not more than +/-0.01 ℃/10min, the interval half width is 0.01 ℃, and the constant temperature tank is uniformly distributed, and then:
5) Standard uncertainty:
synthesis standard uncertainty calculation:
the components are mutually independent, and standard uncertainty is synthesized by adopting a square root method:
6) Extended uncertainty:
at 25.0 ℃, the uncertainty is expanded in measurement of the indication error of the detected integrated online temperature sensor:
U＝k×u c ＝2×0.08＝0.16℃，k＝2
according to the principle that the measurement uncertainty is better than the allowable error of the measured object by 1/3, when the allowable error requirement of the temperature sensor is not more than +/-0.5 ℃, the measurement detection method can be adopted.
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