CN207280638U - A kind of mass method calorimeter automatic calibrator based on M-bus interfaces - Google Patents
A kind of mass method calorimeter automatic calibrator based on M-bus interfaces Download PDFInfo
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- CN207280638U CN207280638U CN201721267247.5U CN201721267247U CN207280638U CN 207280638 U CN207280638 U CN 207280638U CN 201721267247 U CN201721267247 U CN 201721267247U CN 207280638 U CN207280638 U CN 207280638U
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Abstract
It the utility model is related to a kind of mass method calorimeter automatic calibrator based on M bus interfaces, it supplies water by the first or second electromagnetic flowmeter detection flows, by standard, the backwater platinum resistance thermometer detection calculating standard temperature difference, so as to calculate standard hot value, read accumulation heat of the calorimeter in testing time section, and compared with standard hot value, calculate test error and judge whether calorimeter is qualified；Can also be by setting corresponding water flowing quality and flow velocity, record measurement water quality is carried out by volume tank of weighing to calculate normal flow, supplied water using standard, the backwater platinum resistance thermometer detection calculating standard temperature difference, standard hot value is calculated according to heat Calculation formula, and compared with the accumulation calorie value of the calorimeter of reading, calculation error, judges whether calorimeter is qualified；The utility model combines together standard law verification system and mass method verification system, calibration method can be switched according to different testing requirements and condition, using the changeable water flow circuits of reversing solenoid valve, so as to switch between method of standard table calibrating and mass method calibrating, calibrating efficiency is improved.
Description
Technical field
The utility model belongs to instrument calibration system research technical field, and in particular to a kind of matter based on M-bus interfaces
Amount method calorimeter automatic calibrator.
Background technology
Supply hot water continuous development of the reform, household metering have become the significant concern point of heating energy-saving, the mount of using heat meter
Amount charge replaces increasingly obtaining the favor of common people by area metering charge, and the value for ensureing calorimeter is accurately and reliably a point family
The important foundation of metering.And calorimeter automatic calibrator is exactly the standard set-up for testing calorimeter metering performance, for heat
Scale manufacturing enterprise provides reliable test result, and can carry out multiplicating calibrating to calorimeter, ensures the reliable of calorimeter
Use.
At present, the calibration method of calorimeter and calibration equipment China state of development compared with calorimeter product slowly,
Its scientific and the degree of automation all has much room for improvement.Main problem existing for heat meter calibrating apparatus is data acquisition, data meter
Science, the degree of automation be not low, system operatio is inconvenient for calculation processing, influences Measurement Verification Work efficiency.Meanwhile asked for above-mentioned
Topic, it is very necessary to develop a set of mass method calorimeter automatic calibrator based on M-bus communications protocol interfaces.
Meanwhile the background support platform of the device can provide counseling services for the public at any time, by integrate metering resource and
Measurement capability, physical resources ability is lifted according to industry requirement, there is provided networking supports, and is convenient for measuring user and selects appropriate amount
Value is traced to the source approach, and provides the magnitude tracing service such as calibrating, calibration and test of authority in time, is supported long-term important in China
National strategy, promotes socio-economic development.
The content of the invention
In order to overcome the shortcomings of present in above-mentioned technology, the utility model provides a kind of by mass method verification system and mark
Quasi- table method verification system, which combines together, and calibrating efficiency is high, verification result is reliable, calibrating is lower-cost is based on M-bus interfaces
Mass method calorimeter automatic calibrator.
Technical solution is used by the utility model：
A kind of mass method calorimeter automatic calibrator based on M-bus interfaces, it includes constant temperature water tank 1, volume of weighing
Tank 30, electronic scale 29, reversing solenoid valve 31, test pipeline 21, flow-rate adjustment control unit, standard constant temperature bath, thermometer group with
And industrial personal computer 33；
The water outlet of the constant temperature water tank 1 and the water inlet end for volume tank 30 of weighing respectively with reversing solenoid valve 31 connects, and claims
Weight volume tank 30 is placed on electronic scale 29 and the water outlet for volume tank 30 of weighing passes through tank drain solenoid valve 32 and constant temperature water tank 1
Backwater end connection, the water outlet of constant temperature water tank 1 connected by pipeline with the water inlet end of test pipeline 21, tests going out for pipeline 21
Water end (W.E.) is connected with the water inlet end of flow-rate adjustment control unit, the water outlet of flow-rate adjustment control unit and reversing solenoid valve 31 into
Water end (W.E.) connects；
The thermometer group includes standard water supply platinum resistance thermometer 13 and standard backwater platinum resistance thermometer 14 and pipe
Platinum resistance thermometer 22 after platinum resistance thermometer 17 and pipeline before road, standard water supply platinum resistance thermometer 13 and standard backwater platinum electricity
Resistance thermometer 14 is separately positioned in the supply flume 15 and return flume 16 of standard constant temperature bath, and passes through thermal resistance calibrating instrument 12 respectively
It is electrically connected with industrial personal computer 33；Platinum resistance thermometer 22 is separately positioned on test pipeline after platinum resistance thermometer 17 and pipeline before pipeline
21 water inlet end and water outlet；
Platinum electricity after platinum resistance thermometer 17, pipeline before the reversing solenoid valve 31, flow-rate adjustment control unit and pipeline
Resistance thermometer 22, tank drain solenoid valve 32 are electrically connected with industrial personal computer 33 respectively.
Further limit, the flow-rate adjustment control unit includes being connected in test 21 water outlet of pipeline and commutation electricity in parallel
Small flow adjustment pipe and big flow between magnet valve 31 adjust pipeline, and small flow adjustment pipe includes the first electricity being sequentially connected in series
Magnetic flowmeter 23, the first motor-operated control valve 25 and the first solenoid valve 27；Big flow, which adjusts pipeline, includes what is be sequentially connected in series
Second electromagnetic flowmeter 24, the second motor-operated control valve 26 and the second solenoid valve 28；First electromagnetic flowmeter 23 and second
The water intake end of electromagnetic flowmeter 24 is connected with 21 water outlet of test pipeline respectively, and the first solenoid valve 27 and the second electromagnetism are adjusted
Water intake end of the water outlet of valve 28 respectively with reversing solenoid valve 31 connects.
Further limit, radiator thermometer 2 and liquid level gauge 3 are provided with constant temperature water tank 1, in constant temperature water tank 1 and test
Water pump 5, check-valves 6 and vacuum tank 8 are disposed with connecting line between pipeline 21.
Further limit, be respectively arranged with intake pressure transmitter 10 in the water inlet end of test pipeline 21 and water outlet and go out
Hydraulic pressure power transmitter 11, intake pressure transmitter 10 and discharge pressure transmitter 11 are electrically connected with industrial personal computer 33 respectively.
Further limit, 18 He of water inlet control valve is respectively arranged with the water inlet port of test pipeline 21 and water outlet port
Outlet water control valve 19.
Further limit, the test pipeline 21 is to be made up of 2~10 calorimeters straight pipe unicom, calorimeter
M-bus lines communicated with industrial personal computer 33.
The mass method calorimeter automatic calibrator based on M-bus interfaces of the utility model, method of standard table calibrating is logical
Cross the first electromagnetic flowmeter or the second electromagnetic flowmeter detection flows, by standard water supply platinum resistance thermometer and standard backwater platinum
Resistance thermometer detects the calculating standard temperature difference, so as to calculate standard hot value, calorimeter can directly read the table by M-bus
Accumulation heat in testing time section, compared with accumulating calorie value with calorimeter by standard hot value, calculates survey automatically
Error is tried, determines whether out whether calorimeter is qualified；Mass method calibrating is the corresponding water flowing quality of setting and flow, passes through title
Weight volume tank carry out record measurement water quality to calculate normal flow, by standard water supply platinum resistance thermometer and standard backwater platinum
Resistance thermometer detects the calculating standard temperature difference, standard hot value is calculated according to heat Calculation formula, by being directly read with M-bus
The accumulation calorie value of calorimeter be compared, calculation error judges whether calorimeter qualified.
Compared with prior art, the utility model has the advantages that：
1) the utility model utilizes the changeable water flow circuits of reversing solenoid valve, so as in the calibrating of method of standard table heat and matter
Switch between the calibrating of amount method heat, calibration method can be switched according to different testing requirements and condition.The utility model is by standard
Table method verification system combines together with mass method verification system, in addition by M-bus buses, adds calorimeter parameters
The automatic collection of information collects detection and data Automatic analysis, improves calibrating efficiency.
2) the utility model can select corresponding detection method according to being actually needed, and improve work efficiency and verification result
Reliably, calibrating is convenient and efficient, and technical support is provided for heat metering reform and development.
3) the utility model is capable of providing the magnitude tracing services such as calibrating, calibration and the test of timely authority.
Brief description of the drawings
Fig. 1 is the structure diagram of the utility model.
Embodiment
The utility model is further described in conjunction with embodiment and attached drawing, the utility model is not limited only to following
Implementation situation.
As shown in Figure 1, the mass method calorimeter automatic calibrator based on M-bus interfaces of the present embodiment is by thermostatted water
Case 1, radiator thermometer 2, liquid level gauge 3, first manual control valve 4, water pump 5, check-valves 6, the second hand control valve 7, vacuum tank
8th, the 3rd manual ball valve 9, intake pressure transmitter 10, discharge pressure transmitter 11, thermal resistance calibrating instrument 12, standard water supply platinum electricity
Platinum resistance thermometer 17, water inlet before resistance thermometer 13, standard backwater platinum resistance thermometer 14, supply flume 15, return flume 16, pipeline
Platinum resistance thermometer 22, the first electromagnetic flowmeter after control valve 18, outlet water control valve 19, meter-clamping apparatus 20, test pipeline 21, pipeline
23rd, the second electromagnetic flowmeter 24, the first motor-operated control valve 25, the second motor-operated control valve 26, first the 27, second electricity of solenoid valve
Magnetically condition valve 28, electronic scale 29, volume tank of weighing 30, reversing solenoid valve 31, tank drain solenoid valve 32 and industrial personal computer 33 connect
Form.
Specifically：Radiator thermometer 2 and liquid level gauge 3,2 He of radiator thermometer are installed on the constant temperature water tank 1 of the present embodiment
Liquid level gauge 3 is electrically connected by conducting wire with industrial personal computer 33, gathers the temperature and liquid level of constant temperature water tank 1 in real time, and is fed back
Industrial personal computer 33 is sent to, heater insulation or heating and inflow are controlled by industrial personal computer 33, so as to control constant temperature water tank 1
Temperature and liquid level, and overvoltage, overtemperature, water shortage etc. are monitored in real time and alarm, the water outlet of the constant temperature water tank 1 pass through
First manual control valve 4 on pipeline is connected with the water inlet of water pump 5, and non-return is provided with the outlet pipeline of water pump 5
6 and second hand control valve 7 of valve, the water outlet of the second hand control valve 7 are connected by vacuum tank 8 with the 3rd hand control valve 9,
The water outlet of 3rd hand control valve 9 passes through water inlet control valve 18, mechanical meter-clamping apparatus 20 and the test pipeline for being provided with calorimeter
21 connections, test pipeline 21 connect three-way connection by outlet water control valve 19, and it is single to connect flow-rate adjustment control by three-way connection
Member, the flow-rate adjustment control unit is by the small stream including being connected in parallel between test 21 water outlet of pipeline and reversing solenoid valve 31
Amount adjusts pipeline and big flow adjusts pipeline, and small flow adjustment pipe includes the first electromagnetic flowmeter 23, first being sequentially connected in series
25 and first solenoid valve 27 of motor-operated control valve；Big flow adjusts the second electromagnetic flowmeter that pipeline includes being sequentially connected in series
24th, the second motor-operated control valve 26 and the second solenoid valve 28；The outlet water control valve 19 for testing pipeline 21 is connected by three
Water inlet end of the head respectively with the first electromagnetic flowmeter 23 and the second electromagnetic flowmeter 24 connects, the first electromagnetic flowmeter 23 and second
Electromagnetic flowmeter 24 is installed in parallel, and is connected respectively with industrial personal computer 33, in order to ensure that flow detection result is accurate, the present embodiment
The first electromagnetic flowmeter 23 use DN6 electromagnetic flowmeters, the second electromagnetic flowmeter 24 use DN25 electromagnetic flowmeters, first
The output terminal of electromagnetic flowmeter 23 is provided with the first motor-operated control valve 25, and the output terminal of the first motor-operated control valve 25 is provided with first
Solenoid valve 27, the output terminal of the second electromagnetic flowmeter 24 are provided with the second motor-operated control valve 26, the second motor-operated control valve 26
Output terminal the second solenoid valve 28, i.e. the first electromagnetic flowmeter 23 and the first motor-operated control valve 25, the first electromagnetism are installed
27 serial communication of regulating valve forms small flow adjustment pipe；Second electromagnetic flowmeter 24 and second the 26, second electricity of motor-operated control valve
28 serial communication of magnetically condition valve forms big flow and adjusts pipeline.When flow is smaller, the first motor-operated control valve 25 is opened, closes the
Two motor-operated control valves 26, by the first solenoid valve 27 according to setting flow-rate adjustment aperture, with the first electromagnetic flowmeter 23 into
Row detection, and send traffic pulse to industrial personal computer 33；When flow is larger, switch piping flow, it is electronic to open second
Control valve 26, closes the first motor-operated control valve 25, by the second solenoid valve 28 according to setting flow-rate adjustment aperture, with second
24 detection flows of electromagnetic flowmeter and to 33 transmitted traffic pulse signal of industrial personal computer, you can switched in due course according to different flow size
Flow-rate adjustment control piper.First solenoid valve, 27 and second solenoid valve 28 is changed by another three-way connection with pipeline
Connected to solenoid valve 31, one end of reversing solenoid valve 31 connects volume tank 30 of weighing, and the other end is directly connected to constant temperature water tank 1, claims
Weight volume tank 30 is placed on electronic scale 29 and obtains its weighing information by electronic scale 29, and electronic scale 29 passes through conducting wire and industry control
Machine 33 connects, and realizes serial communication, and the weighing information for volume tank 30 of weighing is fed back to industrial personal computer 33.Volume tank of weighing 30 goes out
Water end (W.E.) is connected by tank drain solenoid valve 32 with the backwater end of constant temperature water tank 1, when detection mode selection criteria table method, commutation electricity
31 automatic switching-over pipeline of magnet valve is detected by electromagnetic flowmeter to constant temperature water tank 1, when detection mode selects mass method,
Reversing solenoid valve 31 switches to volume tank 30 of weighing, and is detected by setting water flowing quality using volume tank 30 of weighing.It is i.e. permanent
Reservoir 1, test pipeline 21, flow-rate adjustment control unit connect to form a circuit；And volume tank 30 of weighing, constant temperature water tank 1,
Test pipeline 21, flow-rate adjustment control unit connect to form another circuit.
Need to further illustrate, in order to meet the requirement of different hydraulic pressure and timely monitor, in above-mentioned test pipeline 21
Water inlet end is also equipped with platinum resistance thermometer 17 and water inlet control valve 18 before intake pressure transmitter 10, pipeline, corresponds to
The water outlet of test pipeline 21 is provided with outlet water control valve 19, and is provided with the water outlet of outlet water control valve 19 platinum after pipeline
Resistance thermometer 22 and discharge pressure transmitter 11, outlet water control valve 19 pass through reversing solenoid valve in pipeline 31 and constant temperature water tank 1
Or volume tank 30 of weighing connects, constant temperature water loop is formed.
Need to further illustrate, the present embodiment is to fix each test calorimeter clamping fastening series connection shape using meter-clamping apparatus 20
Into test pipeline 21, which selects mechanical meter-clamping apparatus 20, and the test pipeline 21 of the present embodiment is led to by 10 calorimeters
Cross straight pipe and U-tube section connects to form U-tube road, the M-bus line connecting communication translation interfaces of calorimeter, will to industrial personal computer 33
Actual measurement heat signal is transmitted to industrial personal computer 33.
The calorimeter number of pipeline 21 is tested in above-described embodiment can also adjust in the range of 2~10, and calorimeter can select
With the calorimeter of the different models such as small-bore DN15, DN20, DN25, replaced according to actual calibrating demand.
Platinum resistance thermometer 22 uses conducting wire and industrial personal computer respectively after platinum resistance thermometer 17, pipeline before the pipeline of the present embodiment
33 connections, in real time to the actual inflow temperature and leaving water temperature of 33 feedback test pipeline 21 of industrial personal computer.
Platinum resistance thermometer 22 and standard water supply platinum resistance thermometer 13 after platinum resistance thermometer 17, pipeline before the pipeline,
Standard backwater platinum resistance thermometer 14 collectively constitutes the thermometer group of the present embodiment, its 13 He of Plays water supply platinum resistance thermometer
Standard backwater platinum resistance thermometer 14, which is arranged at outside pipe-line system, to be independently arranged and can be on the standard constant temperature bath of automatic temperature-control, can be with
Thermal resistance calibrating instrument 12 connects, and the normal temperature for obtaining water supply and backwater is poor.Specially：The thermal resistance calibrating instrument 12 of the present embodiment
Standard port is connected with standard water supply platinum resistance thermometer 13, standard backwater platinum resistance thermometer 14 respectively, standard water supply platinum electricity
Resistance thermometer 13 is placed in the supply flume 15 on standard constant temperature bath, and standard backwater platinum resistance thermometer 14 is placed on standard constant temperature bath
Return flume 16 in, the temperature difference between supply water temperature and return water temperature is poor as normal temperature.Thermal resistance calibrating instrument 12 with
Industrial personal computer 33 is connected by data cable, realizes serial communication.
Calorimeter is examined and determine with the mass method calorimeter automatic calibrator based on M-bus interfaces of the present embodiment
When, tested calorimeter is placed on calibrating operation console before calibrating, and by meter-clamping apparatus 20 clamp clamping, standard is supplied
Water platinum resistance thermometer 13, standard backwater platinum resistance thermometer 14 are inserted into corresponding supply flume 15 and return flume 16, are set
Temperature (ultrasonic calorimeter is used in the calibrating of supply flume 15 and return flume 16 in advance：Supply water 50 DEG C, 30 DEG C of backwater；Mechanical heat meter：
Supply water 70 DEG C, 50 DEG C of backwater), the M-bus line connecting communication translation interfaces of all tested calorimeters in pipeline 21 are tested to work
On control machine 33, hot water in constant temperature water tank 1 is transferred to design temperature, hot water is sent into test pipeline 21 by water pump 5, and instrument shows pipeline
The signals such as temperature, pressure, high water tank and gravimetric tank quality.
When selection criteria table method is examined and determine, after reaching setting flow, reversing solenoid valve 31 automatically switches to 1 backwater of constant temperature water tank
End, computer-automatic collection standard water supply platinum resistance thermometer 13 and standard backwater platinum resistance thermometer 14, calculate standard temperature
Difference, while the initial heat indicating value of calorimeter is detected by M-bus serial communication interface start recordings, utilize pulse signal acquisition
And the flow indicating value of the first electromagnetic flowmeter 23 or the second electromagnetic flowmeter 24 is calculated, treat that the set time is covered in water flowing detection
Afterwards, automatic collection is detected the termination indicating value of calorimeter, while calculates standard hot value and tested calorimeter accumulation calorie value.Adopt
After the completion of collection, stop detection, system calculates the error of tested calorimeter automatically, by checking its error whether in required mistake
Judge whether calorimeter is qualified in the range of difference limit, complete calibrating.
When selecting mass method calibrating, corresponding water flowing quality is set according to calorimeter bore and pipeline tests flow, is led to
Water detects, and firm beginning system can carry out the exhaust process of a period of time, and reversing solenoid valve 31 automatically switches to volume tank 30 of weighing,
During 32 valve of tank drain solenoid valve in opened condition, form whole test loop；Exhaust terminates, and treats that tank drain solenoid valve 32 is complete
Contract fully, electronic scale 29 show static, while volume tank 30 of weighing has a certain amount of water, at this time system by communication interface from
The dynamic quality for gathering volume tank 30 of weighing, passes through the initial heat of M-bus automatic collection calorimeters.Open the first motor-operated control valve
25 or second motor-operated control valve 26, water flowing test, system carried out according to the water flowing quality of setting after the test of corresponding time from
It is dynamic to stop water flowing, corresponding motor-operated control valve is closed, automatic collection is weighed the matter of volume tank 30 when electronic scale 29 is totally stationary
The termination heat of amount and calorimeter.System calculates the error of tested calorimeter automatically, by checking whether its error is being wanted
Judge whether calorimeter is qualified in the range of the limits of error asked, meanwhile, at the end of whole detection test, tank drain solenoid valve 32
Valve automatically opens up, and the water of volume tank of weighing 30 flows back to constant temperature water tank 1 by 32 valve of tank drain solenoid valve, and whole detection process is complete
Into.
Claims (6)
- A kind of 1. mass method calorimeter automatic calibrator based on M-bus interfaces, it is characterised in that：Including constant temperature water tank (1), Volume tank of weighing (30), electronic scale (29), reversing solenoid valve (31), test pipeline (21), flow-rate adjustment control unit, standard are permanent Warm groove, thermometer group and industrial personal computer (33)；Water outlet of the water inlet end of the constant temperature water tank (1) and volume tank of weighing (30) respectively with reversing solenoid valve (31) connects, Volume tank of weighing (30) is placed on electronic scale (29) and the water outlet of volume tank of weighing (30) passes through tank drain solenoid valve (32) Connected with the backwater end of constant temperature water tank (1), the water outlet of constant temperature water tank (1) is connected by the water inlet end of pipeline and test pipeline (21) Logical, the water outlet of test pipeline (21) is connected with the water inlet end of flow-rate adjustment control unit, the water outlet of flow-rate adjustment control unit End is connected with the water inlet end of reversing solenoid valve (31)；The thermometer group includes standard water supply platinum resistance thermometer (13) and standard backwater platinum resistance thermometer (14) and pipe Platinum resistance thermometer (22) after platinum resistance thermometer (17) and pipeline before road, standard water supply platinum resistance thermometer (13) and standard are returned Water platinum resistance thermometer (14) is separately positioned in the supply flume (15) and return flume (16) of standard constant temperature bath, and passes through heat respectively Resistance calibrating instrument (12) is electrically connected with industrial personal computer (33)；Platinum resistance thermometer after platinum resistance thermometer (17) and pipeline before pipeline (22) water inlet end and the water outlet of test pipeline (21) are separately positioned on；Platinum electricity after platinum resistance thermometer (17), pipeline before the reversing solenoid valve (31), flow-rate adjustment control unit and pipeline Resistance thermometer (22), tank drain solenoid valve (32) are electrically connected with industrial personal computer (33) respectively.
- 2. the mass method calorimeter automatic calibrator according to claim 1 based on M-bus interfaces, it is characterised in that： The flow-rate adjustment control unit includes being connected in parallel small between test pipeline (21) water outlet and reversing solenoid valve (31) Flow adjustment pipe and big flow adjust pipeline, the first electromagnetic flowmeter (23) that small flow adjustment pipe includes being sequentially connected in series, First motor-operated control valve (25) and the first solenoid valve (27)；Big flow adjusts the second electromagnetism that pipeline includes being sequentially connected in series Flowmeter (24), the second motor-operated control valve (26) and the second solenoid valve (28)；First electromagnetic flowmeter (23) and second The water intake end of electromagnetic flowmeter (24) is connected with test pipeline (21) water outlet respectively, the first solenoid valve (27) and the second electricity Water intake end of the water outlet of magnetically condition valve (28) respectively with reversing solenoid valve (31) connects.
- 3. the mass method calorimeter automatic calibrator according to claim 2 based on M-bus interfaces, it is characterised in that： Radiator thermometer (2) and liquid level gauge (3) are provided with constant temperature water tank (1), between constant temperature water tank (1) and test pipeline (21) Connecting line on be disposed with water pump (5), check-valves (6) and vacuum tank (8).
- 4. according to mass method calorimeter automatic calibrator of the claims 1 to 3 any one of them based on M-bus interfaces, its It is characterized in that：Intake pressure transmitter (10) and discharge pressure are respectively arranged with the water inlet end of test pipeline (21) and water outlet Transmitter (11), intake pressure transmitter (10) and discharge pressure transmitter (11) are electrically connected with industrial personal computer (33) respectively.
- 5. the mass method calorimeter automatic calibrator according to claim 4 based on M-bus interfaces, it is characterised in that： Water inlet control valve (18) and outlet water control valve (19) are respectively arranged with the water inlet port of test pipeline (21) and water outlet port.
- 6. the mass method calorimeter automatic calibrator according to claim 1 based on M-bus interfaces, it is characterised in that： The test pipeline (21) is to be made up of 2~10 calorimeters straight pipe unicom, the M-bus lines and industrial personal computer of calorimeter (33) communicate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721267247.5U CN207280638U (en) | 2017-09-28 | 2017-09-28 | A kind of mass method calorimeter automatic calibrator based on M-bus interfaces |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721267247.5U CN207280638U (en) | 2017-09-28 | 2017-09-28 | A kind of mass method calorimeter automatic calibrator based on M-bus interfaces |
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| CN207280638U true CN207280638U (en) | 2018-04-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108917891A (en) * | 2018-09-27 | 2018-11-30 | 山东省计量科学研究院 | A kind of high-temp liquid flow standard device |
-
2017
- 2017-09-28 CN CN201721267247.5U patent/CN207280638U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108917891A (en) * | 2018-09-27 | 2018-11-30 | 山东省计量科学研究院 | A kind of high-temp liquid flow standard device |
| CN108917891B (en) * | 2018-09-27 | 2024-02-09 | 山东省计量科学研究院 | High-temperature liquid flow standard device |
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