CN219496365U - Purified water system sensor on-line measuring structure - Google Patents
Purified water system sensor on-line measuring structure Download PDFInfo
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- CN219496365U CN219496365U CN202320804021.3U CN202320804021U CN219496365U CN 219496365 U CN219496365 U CN 219496365U CN 202320804021 U CN202320804021 U CN 202320804021U CN 219496365 U CN219496365 U CN 219496365U
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Abstract
The utility model discloses 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 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 utility model belongs to the technical field of metering and testing of biochemical, thermal and fluid detection instruments and equipment. More particularly, the present utility model relates to an on-line detection structure applied to a purified water system sensor.
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 utility model provides an online detection method of 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 utility model is as follows:
the utility model 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.
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 utility model;
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 utility model;
fig. 4 is a schematic view of the structure of the sensor penetrating out of the outer protective sleeve according to the present utility model.
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 utility model, 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 utility model by those skilled in the art.
The structure of the utility model as shown in fig. 1 is an on-line detection method of 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 utility model adopts the following technical scheme:
as shown in fig. 1, the online detection structure of the purified water system sensor of the utility model 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 utility model 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 utility model 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 utility model 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 utility model also provides an online detection method of 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:
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 constant temperature tank, namely the measured value of a standard platinum resistance thermometer expressed by temperature, is in DEG 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 utility model has been described above with reference to the accompanying drawings, it will be apparent that the utility model 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 utility model are adopted, all within the scope of the utility model.
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 outer protective sleeve (5) is made of a corrosion-resistant and high-temperature-resistant metal material.
5. 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).
6. 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.
7. The purified water system sensor on-line measuring structure according to claim 1, wherein: 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).
8. 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.
9. The purified water system sensor on-line measuring structure according to claim 8, wherein: 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 (5); or a through hole is arranged at the inner end part of the outer protective sleeve (5) so that the sensor penetrates out of the outer protective sleeve (5) from the through hole.
10. 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.
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