CN117368046A - Online densimeter verification standard device - Google Patents
Online densimeter verification standard device Download PDFInfo
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- 238000012795 verification Methods 0.000 title claims abstract description 33
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- 238000005259 measurement Methods 0.000 claims abstract description 94
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- 238000003860 storage Methods 0.000 claims description 17
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- 238000004891 communication Methods 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000000326 densiometry Methods 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000003556 assay Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000001739 density measurement Methods 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
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- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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Abstract
The invention discloses an on-line densimeter verification standard device, which comprises an incubator, a liquid supply unit, a detected unit, liquid, a desk densimeter and a measurement and control computer, wherein the incubator is connected with the liquid supply unit; the constant temperature box comprises a constant temperature box body and a box temperature controller for controlling the temperature in the constant temperature box body; the detected unit, the liquid supply unit and the liquid are placed in the incubator and controlled by the temperature of the detected unit, the desk densimeter and the measurement and control computer are located outside the incubator, the measurement and control computer sets a temperature set value ST of the incubator through a control line CT, and a flow value F1 of the circulating pump is set through a control line CF, so that the temperature of the liquid quickly tends to the temperature set value ST of the incubator and is stable, the measurement and control computer compares a measured density value D1 of the online densimeter with a standard density value SD value measured by the desk densimeter, and verification work of the online densimeter is completed. The invention simplifies the structure of the standard device, shortens the temperature stability process of the liquid and improves the efficiency of the verification process.
Description
Technical Field
The invention relates to an on-line densimeter verification standard device.
Background
The density measurement test relates to the fields of petroleum, chemical industry, metallurgy, building materials, light industry, coal, commercial inspection, medical treatment, trade, scientific research and the like, and has very wide application. For density measurement, it is often only possible to measure static liquid density with a densitometer as an etalon. The density of flowing liquid is required to be measured in real time in industrial production, and the online densimeter well solves the problem. But the online densitometer is used as a metering device, and needs to be regularly or irregularly verified so as to ensure the metering accuracy.
In an actual on-line densitometer calibration standard device, the temperature stability of the liquid in the on-line densitometer has higher requirements. The temperature stability of the liquid in the line densitometer during the assay is required to reach + -0.05 deg.c as specified by the national metrology calibration protocol jjjg 370-2019. The prior disclosures such as patent CN201810763269.3 and CN202022120570.8 adopt the implementation technology that an existing thermostatic bath (or called thermostatic water bath) and an existing thermostatic box device are spliced together through a pipeline, an online densitometer is arranged at the temperature inside by adopting an thermostatic box, one set of temperature control system is needed for controlling the temperature of the thermostatic box, one thermostatic bath is used for controlling the temperature of liquid outside the thermostatic box, the other set of temperature control system is needed for controlling the temperature of the thermostatic bath, and then a circulating pump (or called liquid sending pump) and a pipeline are used for inputting the liquid into the online densitometer in the thermostatic box. Therefore, when the online densimeter is detected, the constant temperature box and the constant temperature tank are controlled by two sets of temperature control systems, coordinated control is needed between the constant temperature box and the constant temperature tank, and a pipeline exposed in the air is interfered by the ambient temperature, so that the complexity of temperature stability control in the detecting process is increased, the temperature stability control period of the standard device is prolonged during detection, the detecting efficiency is reduced, the rotating speed of the circulating pump cannot be controlled, and the liquid circulation speed cannot be adjusted.
Disclosure of Invention
Aiming at the defects of the prior art method, the invention provides an on-line densimeter verification standard device, which mainly comprises a liquid supply unit, a verification unit and liquid, wherein the three parts are placed in a constant temperature box to work, and when the on-line densimeter is detected, the liquid temperature is controlled by the temperature XT in the constant temperature box; in order to enable the liquid temperature body to quickly approach to the detection temperature point JT and adjust the stability of the inlet and outlet temperatures of the online densimeter to reach +/-0.05 ℃, the circulating pump is designed to be an adjustable flow value F1 so as to adjust the heat exchange speed between the liquid and the temperature of the constant temperature box; the set value ST of the incubator is set to be equal to the verification temperature point JT through the incubator temperature controller, and a circulating pump in the liquid supply unit sets a flow value F1 according to a measurement and control computer, so that liquid circularly flows between the liquid supply unit and the detected unit, and the temperature of the liquid quickly tends to be stable at the verification temperature point JT.
In order to solve the technical problems, the invention adopts the following technical scheme: an on-line densimeter verification standard device comprises an incubator, a liquid supply unit, a detected unit, liquid, a table densimeter and a measurement and control computer; the constant temperature box comprises a constant temperature box body and a box temperature controller for controlling the temperature in the constant temperature box body, and the box temperature controller controls the temperature value XT in the constant temperature box body according to a set value ST; the method is characterized in that: the detected unit, the liquid supply unit and the liquid are placed in a constant temperature box for working, the temperature of the liquid is controlled by the temperature XT in the constant temperature box, the desk type densimeter and the measurement and control computer are positioned outside the constant temperature box, the desk type densimeter is connected to the measurement and control computer through an instrument control communication line YC, the measurement and control computer controls a set value ST of the box temperature controller through a control line CT of the box temperature controller and measures the temperature XT in the box, the liquid supply unit is provided with a circulating pump to send the liquid to the detected unit, the detected unit is used for measuring a measured density value of the liquid, an inlet temperature value of the liquid, an outlet temperature value of the liquid and a flow value of the liquid, and the desk type densimeter is used for measuring a standard density value of the liquid; the measurement and control computer can respectively set a set value ST of the box temperature controller and a flow value F1 of the circulating pump through control lines CT and CF to enable an inlet temperature value and an outlet temperature value of liquid flowing into a detected unit to tend to a target value and be stable, and the measured density value D1 of the online densimeter is compared with a standard density value SD value measured by the desk densimeter, so that verification work of the online densimeter is completed.
Further, the liquid supply unit comprises a liquid storage tank, a circulating pump, an output pipeline, an input pipeline and a pipeline pressure gauge; the liquid is stored in the liquid storage tank, the liquid in the liquid storage tank enters the inspected unit in the constant temperature box body through the output pipeline according to the flow value F1, and the liquid flowing out of the inspected unit flows back into the liquid storage tank through the input pipeline; the circulating pump enables the liquid to continuously circulate between the liquid supply unit and the detected unit, so that the temperature of the flowing liquid is driven to the set value ST of the box temperature controller; the control line CF of the circulating pump is led out of the incubator and connected with a measurement and control computer, so that the measurement and control computer can set the flow value F1 of the circulating pump; the pressure value P1 measured by the pipeline pressure gauge is arranged on the output pipeline and is transmitted to the measurement and control computer through a signal line SP 1. .
Further, the detected unit comprises an online densimeter to be detected, a detected unit pipeline, an inlet temperature sensor, an outlet temperature sensor and a flowmeter, wherein the online densimeter to be detected, the inlet temperature sensor, the outlet temperature sensor and the flowmeter are all arranged on the detected unit pipeline, liquid from a liquid supply unit in the constant temperature box body flows into the online densimeter through the detected pipeline, and liquid flowing out of the online densimeter flows back to the liquid supply unit through the detected pipeline; the on-line densimeter measures the measured density value D1 of the liquid and transmits the measured density value D1 to the measurement and control computer through a signal line SD 1; the flowmeter measures the flow value F1 of the liquid in the pipeline of the detected unit and transmits the flow value F1 to the measurement and control computer through the signal line SF 1; an inlet temperature sensor at the inlet of the detected unit measures an inlet temperature value YT1 and transmits the value to a measurement and control computer through a signal line ST 1; an outlet temperature sensor at the outlet of the detected unit measures an outlet temperature value YT2 and transmits the outlet temperature value YT2 to the measurement and control computer through a signal line ST 2.
Further, the control flow of the set value ST of the box temperature controller and the flow value F1 of the circulating pump are regulated by the measurement and control computer: (1) The measurement and control computer sets a set value ST of an inner box temperature controller of the constant temperature box body equal to a verification temperature point JT, opens a manual exhaust valve, firstly makes the flow value F1 of the circulating pump be the minimum value, and closes the manual exhaust valve after the gas in the pipeline is exhausted; (2) When the inlet and outlet temperature values of the liquid are far smaller than the detection temperature point JT, the flow value F1 of the circulating pump is the maximum value, so that the inlet and outlet temperature values of the liquid quickly tend to the detection temperature point JT; (3) When the inlet and outlet temperature values of the liquid approach to the detection temperature point JT, the flow value F1 of the circulating pump is reduced, and the temperature value XT in the constant temperature box body is regulated, so that the temperature value of the liquid meets the stability requirement. (4) And the measurement and control computer records a measured density value D1 of the online liquid densimeter and a standard density value SD of the desk densimeter, and performs verification of the online densimeter.
Specifically, the measurement and control computer sets a box temperature controller to perform constant temperature control on a temperature value XT in a constant temperature box according to a set value ST=JT; the measurement and control computer measures the online densitometry inlet temperature value YT1 and the online densitometry outlet temperature value YT2 to carry out the following control algorithm on the flow value F1 of the circulating pump: the measurement and control computer firstly sets the flow maximum value of the circulating pump as a flow value F1=FM, when the inlet temperature value YT1 stably reaches a set value ST, the measurement and control computer sets the flow value F1 of the circulating pump as a value F1=0.1.FM, then the measurement and control computer measures the inlet temperature value YT1 and the outlet temperature value YT2 and calculates the difference value |YT1-YT2|, if the current flow value F1 of the circulating pump exists |YT1-YT2| > TD, the measurement and control computer sets the current flow value F1 of the circulating pump as F1=F1+0.1.FM until the inlet temperature value YT1 and the outlet temperature value YT2 read by the measurement and control computer reach the stable |YT1-YT2| < TD, and the measurement and control computer records the required measured density value D1 of the densimeter to be detected and the measured density value YT1 and the outlet temperature value YT2 data, and the measured density value corresponding to the liquid temperature value TA=0.5+1+1 and the measured density value D1.
Further, the table densimeter takes the liquid of the liquid supply unit as a test sample and is used for measuring a standard density value SD of the liquid at a set temperature value; the desk densimeter is provided with an instrument control communication line which is connected to a measurement and control computer, and the measurement and control computer performs data acquisition and control on the desk densimeter unit; the measurement and control computer respectively controls the temperature value XT and the flow value F1 in the constant temperature box body through a control line CT of the box temperature controller and a control line CF of the circulating pump, and the measurement and control computer acquires data of a signal line SD1, the signal line SF1, the signal line ST1 and the signal line ST2 and adjusts and sets the temperature value XT and the flow value F1 in the constant temperature box body according to the acquired data; recording the acquired data when the measurement and control computer confirms that the stability of the inlet temperature value YT1 and the outlet temperature value YT2 meets the specified requirement; the measurement and control computer controls a communication line YC through the instrument of the desk densimeter, the set temperature value of the desk densimeter is set as the average value of the temperature values YT1 and YT2, and the standard density value SD of the liquid is measured by the desk densimeter; and the measurement and control computer unit compares the measured density value D1 of the online densimeter with the standard density value SD, so that the accuracy verification of the measured density value D1 is realized.
The technical scheme provided by the invention is that the on-line densimeter verification standard device has at least the following advantages:
according to the invention, a thermostat device which is specially used for controlling the temperature of the liquid is not required to be arranged outside the thermostat, the temperature control system of the thermostat can be used for controlling the temperature of the verification liquid, the coordination control between the thermostat and the thermostat temperature control system is omitted, the interference of the environmental temperature on a pipeline exposed in the air is avoided, the structure of a standard device is simplified, the complexity of temperature stability control in the verification process is reduced, and the efficiency of the verification process is improved.
The foregoing description is a summary of the invention, and the following is a detailed description of the invention along with the accompanying drawings, in order to provide a more clear understanding of the invention.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention;
wherein, 1 is an incubator, which comprises an incubator body 1.1 and an incubator temperature controller 1.2;2 is a liquid supply unit, which comprises a liquid storage tank 2.1, a circulating pump 2.2, an output pipeline 2.3, an input pipeline 2.4 and a pipeline pressure gauge 2.5;3 is a detected unit, which comprises an online densimeter 3.1, an inlet pipeline 3.2, an outlet pipeline 3.3, an inlet temperature sensor 3.4, an outlet temperature sensor 3.5 and a flowmeter 3.6;4 is a liquid; 5 is a bench densitometer; 6, a measurement and control computer; 7 is a manual purge valve.
Detailed Description
The apparatus of the present invention will be described in further detail with reference to the accompanying drawings and the assay flow will be described with reference to the specifications of the national metrology assay protocol JJG 370-2019.
The invention relates to an on-line densitometer calibration standard device, which comprises the following components: the device comprises an incubator 1, a liquid supply unit 2, a detected unit 3, liquid 4, a desk densimeter 5 and a measurement and control computer 6. Wherein the liquid supply unit 2, the detected unit 3 and the liquid 4 are arranged in an incubator to work at one temperature, and the desk densimeter 5 and the measurement and control computer 6 are arranged outside the incubator; the liquid supply unit 2 is used for providing circulating liquid 4 with a detected unit in the constant temperature box 1, the desk densimeter 5 obtains the standard density of the liquid 4 at a set temperature, the measurement and control computer 6 is used for measuring and controlling the temperature, the pressure and the flow value of the liquid 4 in the constant temperature box, and the measured density value D1 of the online densimeter is compared with the standard density value SD measured by the desk densimeter, so that the verification work of the online densimeter is completed.
As shown in fig. 1, the three parts of the liquid supply unit 2, the unit to be inspected 3 and the liquid 4 are placed in an incubator to operate at one temperature, and the on-line densitometer 3.1 is inspected at an inspection temperature point JT of (10 to 60) deg.c by referring to the specifications of the national metrology inspection protocol JJG 370-2019.
The constant temperature box 1 is a closed box body and comprises a constant temperature box body 1.1 and a box temperature controller 1.2 for controlling the temperature XT in the constant temperature box body 1.1, wherein the temperature in the constant temperature box body 1.1 is controlled by the box temperature controller 1.2 according to a set value ST; the liquid supply unit 2, the detected unit 3 and the liquid 4 are all arranged in a temperature environment in the constant temperature box body 1.1 to work, a box temperature control line CT which can measure and control a set temperature value ST is led out of the constant temperature box 1 by the box temperature controller 1.2 and is connected with a measurement and control computer 6, and the measurement and control computer 6 can control the set value ST of the constant temperature box body 1.1 through the box temperature control line CT and measure the temperature value XT in the box, so that the temperatures of the liquid supply unit 2, the detected unit 3 and the liquid 4 in the constant temperature box body 1.1 tend to be consistent and stable.
The liquid supply unit 2 works in a constant temperature box body 1.1 in the constant temperature box 1, the liquid supply unit 2 comprises a liquid storage tank 2.1, a circulating pump 2.2, an output pipeline 2.3, an input pipeline 2.4 and a pipeline pressure gauge 2.5, liquid 4 is stored in the liquid storage tank 2.1, the liquid storage tank 2.1 is connected with the input end of the detected unit 3 through the circulating pump 2.2, and the output end of the detected unit 3 is connected with the liquid storage tank through the input pipeline 2.4; the liquid 4 is stored in the liquid storage tank 2.1, the circulating pump 2.2 works according to the flow value F1 set by the control line CF, the circulating pump 2.2 enables the liquid 4 in the liquid storage tank 2.1 to enter the inspected unit 3 in the constant temperature box body 1.1 after passing through the output pipeline 2.3 according to the set flow value F1, and the liquid 4 flowing out of the inspected unit 3 flows back into the liquid storage tank 2.1 through the input pipeline 2.4; the circulating pump 2.2 continuously circulates the liquid 4 between the liquid supply unit and the detected unit, so that the temperature of the flowing liquid 4 tends to the set value ST of the box temperature controller; the control line CF of the circulating pump 2.2 is led out of the incubator 1 for the measurement and control computer 6 to set the flow value F1 of the circulating pump 2.2; the pipeline pressure meter 2.5 arranged on the output pipeline 2.3 measures the pressure value P1, and the signal line SP1 of the pipeline pressure meter 2.5 with the output pressure value P1 is led out of the incubator 1 for data acquisition by the measurement and control computer 6.
The detected unit 3 also works in the constant temperature box 1.1 in the constant temperature box 1, the detected unit 3 comprises an online densimeter 3.1, an inlet pipeline 3.2, an outlet pipeline 3.3, an inlet temperature sensor 3.4 of the inlet pipeline 3.2, an outlet temperature sensor 3.5 of the outlet pipeline 3.3 and a flowmeter 3.6, one end of the inlet pipeline 3.2 and one end of the outlet pipeline 3.3 are respectively connected with an output pipeline 2.3 and an input pipeline 2.4 of the liquid supply unit 2, the other end of the inlet pipeline 3.2 and the other end of the outlet pipeline 3.3 are respectively connected to an inlet and an outlet of the online densimeter 3.1, liquid 4 in the liquid supply unit 2 flows back to the liquid supply unit 2 through the outlet pipeline 3.3 after entering the online densimeter 3.1 through the inlet pipeline 3.2, a density measured value D1 of the online densimeter 3.1 is transmitted to the measurement and control computer 6 through a signal line SD1, an inlet temperature value measured by the inlet temperature sensor 3.4 and an outlet temperature measured value measured by the inlet temperature sensor 3.5 are respectively connected to the flowmeter 6 through the signal line ST2 and the flowmeter 1 and the flowmeter 6; the control lines CT and CF are respectively arranged on the box temperature controller 1.2 in the incubator 1 and the circulating pump 2.2 in the liquid supply unit 2 and are connected with the measurement and control computer 6, and the measurement and control computer 6 can respectively set a set value ST of the temperature control of the box temperature controller 1.2 and a flow value F1 of the circulating pump 2.2 through the control lines CT and CF; the box temperature controller 1.2 controls the temperature value XT in the constant temperature box 1.1 to a set value ST according to the set value ST, the circulating pump 2.2 enables the liquid 4 to circularly flow between the liquid supply unit 2 and the detected unit 3 according to the set flow value F1, and the measurement and control computer 6 adjusts and sets the box temperature set value ST and the flow value F1 of the circulating pump according to data.
The liquid 4 also works in the incubator 1.1, the liquid 4 circularly flows between the liquid supply unit 2 and the detected unit 3 in the incubator 1.1, specifically, the liquid 4 enters the detected unit 3 from the output pipeline 2.3 by the circulating pump 2.2, the liquid 4 flowing out of the detected unit 3 flows back into the liquid storage tank 2.1 of the liquid supply unit 2 through the input pipeline 2.4 of the liquid supply unit 2, and the circulating pump 2.2 enables the liquid 4 to circularly flow continuously and enables the temperature of the liquid 4 to be close to the temperature value XT in the incubator.
The desk densimeter 5 works outside the incubator 1, the desk densimeter 5 takes the liquid 4 as a sample, the standard density value SD under the condition that the average value TA=0.5 (YT1+YT2) of the temperature of the liquid 4 is measured, the desk densimeter 5 is provided with an instrument control communication line YC which is connected to the measurement and control computer 6, and the measurement and control computer 6 can collect and control data of the desk densimeter 5.
The measurement and control computer 6 works outside the incubator 1, the measurement and control computer 6 respectively sets a set value ST of the incubator temperature controller 1.2 and a flow value F1 of the circulating pump 2.2 in the incubator 1 through a control line CT and a control line CF, the measurement and control computer 6 performs data acquisition on the signal line SP1, the signal line SF1, the signal line ST1, the signal line SD1 and the signal line ST2, and performs new adjustment and setting on the set value ST of the incubator temperature and the flow value F1 of the circulating pump according to the acquired data; recording the acquired data when the measurement and control computer 6 confirms that the stability of the inlet temperature value YT1 and the outlet temperature value YT2 meets the specified requirement; the measurement and control computer 6 controls the communication line YC through the instrument of the desk densimeter 5, the temperature value of the desk densimeter 5 is set to be TA=0.5 (YT1+YT2), and the standard density value SD of the liquid is measured by the desk densimeter 5; the measurement and control computer 6 compares the measured density value D1 of the online liquid densimeter 3.1 with the standard density value SD, and the accuracy verification of the measured density value D1 is realized.
With reference to the specification of the national metrology verification protocol JJG370-2019, when the online densitometer 3.1 is ensured to work normally and the pipe wall is clean and has no foreign matters, the online densitometer is verified according to a verification temperature point JT of (10-60) DEG C.
The verification method comprises the following steps:
(1) The measurement and control computer 6 sets the set value ST of the box temperature controller 1.2 equal to the verification temperature point JT, opens the manual exhaust valve 7, firstly sets the flow value of the circulating pump 2.2 to be the minimum value, namely F1=0.1.FM, and closes the manual exhaust valve 7 after the gas in the pipeline is exhausted; (2) Firstly, the flow value F1 of the circulating pump 2.2 is made to be the maximum value, namely F1=FM, so that the temperature of the liquid 4 quickly tends to the set value ST; (3) When the inlet temperature value YT1 stably reaches the set value ST, the measurement and control computer 6 sets the flow value F1 of the circulation pump 2.2 to f1=0.1.fm value, and then the measurement and control computer 6 measures the inlet temperature value YT1 and the outlet temperature value YT2 and calculates whether the difference value |yt1-yt2| between them satisfies the allowable temperature difference value TD thereof, and if |yt1-yt2| > TD is present at the flow value F1 of the current circulation pump 2.2, the measurement and control computer 6 sets the current flow value F1 of the circulation pump to f1=f1+0.1.fm until the inlet temperature value yt1 and the outlet temperature value yt2 read by the measurement and control computer 6 reach the stable |yt1-yt2| < TD. (4) The measurement and control computer 6 records the measured density value D1, the inlet temperature value YT1 and the outlet temperature value YT2 of the required online densimeter, and obtains the corresponding liquid 4 temperature average value TA=0.5. (YT1+YT2) data and the measured density value D1 data. (5) The measurement and control computer 6 controls the communication line YC through the instrument of the desk densimeter 5, the measurement temperature set value of the desk densimeter 5 is set as the average value TA of the temperature values YT1 and YT2, and the standard density value SD of the liquid 4 is measured by the desk densimeter 5; the measurement and control computer 6 compares the measured density value D1 of the online liquid densimeter 3.1 with the standard density value SD, and the verification of the data of the measured density value D1 of the liquid 4 of the online densimeter 3.3 at the temperature TA is realized.
When the temperature JT of the detection is 20 ℃, the temperature TA of the liquid 4 in the incubator 1 needs to reach 20+/-0.02 ℃, and the step (5) can be performed to finish the accuracy detection of the measured density value D1.
When the temperature JT is detected to be the lowest point, the middle point and the highest point within the range of (10-60) DEG C, the temperature TA of the liquid 4 in the incubator 1 needs to be stabilized at the set value + -0.05 ℃, and the step (5) can be carried out to finish the accuracy detection of the measured density value D1.
The above is a specific embodiment of the invention, the detected unit, the liquid supply unit and the liquid are integrated in the incubator 1, so that the three parts work under one temperature environment of the incubator to achieve consistent temperature stability control, the structure of the standard device is simplified, the temperature stability control capability of the on-line densimeter and the liquid is improved during verification, and the efficiency of the verification process is improved.
Claims (6)
1. An on-line densimeter verification standard device comprises an incubator, a liquid supply unit, a detected unit, liquid, a table densimeter and a measurement and control computer; the constant temperature box comprises a constant temperature box body and a box temperature controller for controlling the temperature in the constant temperature box body, and the box temperature controller controls the temperature value XT in the constant temperature box body according to a set value ST; the method is characterized in that: the detected unit, the liquid supply unit and the liquid are placed in a constant temperature box for working, the temperature of the liquid is controlled by the temperature XT in the constant temperature box, the desk type densimeter and the measurement and control computer are positioned outside the constant temperature box, the desk type densimeter is connected to the measurement and control computer through an instrument control communication line YC, the measurement and control computer controls a set value ST of the box temperature controller through a control line CT of the box temperature controller and measures the temperature XT in the box, the liquid supply unit is provided with a circulating pump to send the liquid to the detected unit, the detected unit is used for measuring a measured density value of the liquid, an inlet temperature value of the liquid, an outlet temperature value of the liquid and a flow value of the liquid, and the desk type densimeter is used for measuring a standard density value of the liquid; the measurement and control computer can respectively set a set value ST of the box temperature controller and a flow value F1 of the circulating pump through control lines CT and CF to enable an inlet temperature value and an outlet temperature value of liquid flowing into a detected unit to tend to a target value and be stable, and the measured density value D1 of the online densimeter is compared with a standard density value SD value measured by the desk densimeter, so that verification work of the online densimeter is completed.
2. The on-line densitometer calibration standard device of claim 1, wherein the liquid supply unit comprises a liquid storage tank, a circulating pump, an output pipeline, an input pipeline and a pipeline pressure gauge; the liquid is stored in the liquid storage tank, the liquid in the liquid storage tank enters the inspected unit in the constant temperature box body through the output pipeline according to the flow value F1, and the liquid flowing out of the inspected unit flows back into the liquid storage tank through the input pipeline; the circulating pump enables the liquid to continuously circulate between the liquid supply unit and the detected unit, so that the temperature of the flowing liquid is driven to the set value ST of the box temperature controller; the control line CF of the circulating pump is led out of the incubator and connected with a measurement and control computer, so that the measurement and control computer can set the flow value F1 of the circulating pump; the pressure value P1 measured by the pipeline pressure gauge is arranged on the output pipeline and is transmitted to the measurement and control computer through a signal line SP 1.
3. The on-line densitometer calibration standard device of claim 2, wherein the inspected unit comprises an on-line densitometer to be inspected, an inspected unit pipeline, an inlet temperature sensor, an outlet temperature sensor and a flowmeter, the on-line densitometer to be inspected, the inlet temperature sensor, the outlet temperature sensor and the flowmeter are all arranged on the inspected unit pipeline, the liquid from the liquid supply unit in the constant temperature box flows into the on-line densitometer through the inspected pipeline, and the liquid flowing out of the on-line densitometer flows back into the liquid supply unit through the inspected pipeline; the on-line densimeter measures the measured density value D1 of the liquid and transmits the measured density value D1 to the measurement and control computer through a signal line SD 1; the flowmeter measures the flow value F1 of the liquid in the pipeline of the detected unit and transmits the flow value F1 to the measurement and control computer through the signal line SF 1; an inlet temperature sensor at the inlet of the detected unit measures an inlet temperature value YT1 and transmits the value to a measurement and control computer through a signal line ST 1; an outlet temperature sensor at the outlet of the detected unit measures an outlet temperature value YT2 and transmits the outlet temperature value YT2 to the measurement and control computer through a signal line ST 2.
4. The on-line densitometer calibration standard device of claim 3, wherein the control flow of the set value ST of the measurement and control computer adjusting the box temperature controller and the flow value F1 of the circulating pump is as follows: (1) The measurement and control computer sets a set value ST of an inner box temperature controller of the constant temperature box body equal to a verification temperature point JT, opens a manual exhaust valve, firstly makes the flow value F1 of the circulating pump be the minimum value, and closes the manual exhaust valve after the gas in the pipeline is exhausted; (2) When the inlet and outlet temperature values of the liquid are far smaller than the detection temperature point JT, the flow value F1 of the circulating pump is the maximum value, so that the inlet and outlet temperature values of the liquid quickly tend to the detection temperature point JT; (3) When the inlet and outlet temperature values of the liquid approach to the detection temperature point JT, the flow value F1 of the circulating pump is reduced, and the temperature value XT in the constant temperature box body is regulated, so that the temperature value of the liquid meets the stability requirement. (4) And the measurement and control computer records a measured density value D1 of the online liquid densimeter and a standard density value SD of the desk densimeter, and performs verification of the online densimeter.
5. The on-line densitometer calibration standard device of claim 4, wherein the measurement and control computer sets the box temperature controller to perform constant temperature control on the temperature value XT in the constant temperature box according to the set value ST=JT; the measurement and control computer measures the online densitometry inlet temperature value YT1 and the online densitometry outlet temperature value YT2 to carry out the following control algorithm on the flow value F1 of the circulating pump: the measurement and control computer firstly sets the flow maximum value of the circulating pump as a flow value F1=FM, when the inlet temperature value YT1 stably reaches a set value ST, the measurement and control computer sets the flow value F1 of the circulating pump as a value F1=0.1.FM, then the measurement and control computer measures the inlet temperature value YT1 and the outlet temperature value YT2 and calculates the difference value |YT1-YT2|, if the current flow value F1 of the circulating pump exists |YT1-YT2| > TD, the measurement and control computer sets the current flow value F1 of the circulating pump as F1=F1+0.1.FM until the inlet temperature value YT1 and the outlet temperature value YT2 read by the measurement and control computer reach the stable |YT1-YT2| < TD, and the measurement and control computer records the required measured density value D1 of the densimeter to be detected and the measured density value YT1 and the outlet temperature value YT2 data, and the measured density value corresponding to the liquid temperature value TA=0.5+1+1 and the measured density value D1.
6. The method according to claim 1, wherein the bench densitometer takes the liquid of the liquid supply unit as a test sample for measuring the standard density value SD of the liquid at a set temperature value; the desk densimeter is provided with an instrument control communication line which is connected to a measurement and control computer, and the measurement and control computer performs data acquisition and control on the desk densimeter unit; the measurement and control computer respectively controls the temperature value XT and the flow value F1 in the constant temperature box body through a control line CT of the box temperature controller and a control line CF of the circulating pump, and the measurement and control computer acquires data of a signal line SD1, the signal line SF1, the signal line ST1 and the signal line ST2 and adjusts and sets the temperature value XT and the flow value F1 in the constant temperature box body according to the acquired data; recording the acquired data when the measurement and control computer confirms that the stability of the inlet temperature value YT1 and the outlet temperature value YT2 meets the specified requirement; the measurement and control computer controls a communication line YC through the instrument of the desk densimeter, the set temperature value of the desk densimeter is set as the average value of the temperature values YT1 and YT2, and the standard density value SD of the liquid is measured by the desk densimeter; and the measurement and control computer unit compares the measured density value D1 of the online densimeter with the standard density value SD, so that the accuracy verification of the measured density value D1 is realized.
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