CN110361077A - A kind of flow and air velocity transducer calibration device and Calibration Method - Google Patents
A kind of flow and air velocity transducer calibration device and Calibration Method Download PDFInfo
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- CN110361077A CN110361077A CN201910778511.9A CN201910778511A CN110361077A CN 110361077 A CN110361077 A CN 110361077A CN 201910778511 A CN201910778511 A CN 201910778511A CN 110361077 A CN110361077 A CN 110361077A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
- G01P21/025—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers for measuring speed of fluids; for measuring speed of bodies relative to fluids
Abstract
The present invention discloses a kind of flow and air velocity transducer calibration device and Calibration Method, including pipe fitting, the blower being mounted on pipe fitting and current stabilization strainer, power supply, frequency converter, Pitot tube, differential manometer, atmospheric pressure detection device, temperature-detecting device, air humidity detection device；It is opened up on pipe fitting side wall after the direction positioned at the Pitot tube jack of the air side of current stabilization strainer, sensor jack, with the hollow flow of air of pipe fitting is, blower is located at the front of current stabilization strainer, alternatively, blower is located at the rear of Pitot tube jack and sensor jack；Blower is connected to power supply and frequency converter；Two limbs of Pitot tube and two orifices of differential manometer.Method includes the following steps: to measure the parameters such as atmospheric pressure, temperature, air humidity, calculates atmospheric density, survey dynamic pressure, calculation of wind speed, flow, calibration sensor.The advantages of invention is: calibration is at low cost, and the calibration used time is short, avoids the situation of sensor reserve level anxiety.
Description
Technical field
The present invention relates to sensor calibration fields, and in particular to a kind of flow and air velocity transducer calibration device and calibration side
Method.
Background technique
Wind speed sensor for coal mine and pipeline flow sensor are important sensors used in Coalmine's Monitoring and Controlling System,
Underground is put into before use, calibration work must be carried out on ground, after calibration, it is desirable that sensor measurement errors will meet underground site
Measurement needs.Use environment various aspects are had certain limitation, calibration precision is much higher than by conventional calibration device category precision apparatus
The needs that scene uses, device is expensive, is mainly used for scientific research and instrument verification qualification unit.The sensor that scene uses,
When there is misalignment, factory's calibration again can only be returned, the whole process time is long, causes sensor reserve level nervous.
Summary of the invention
The technical problem to be solved by the present invention is in the prior art air velocity transducer and flow sensor calibration it is at high cost,
Used time longer problem.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of flow and air velocity transducer calibration
Device, including pipe fitting, the blower being mounted on pipe fitting and current stabilization strainer, power supply, frequency converter, Pitot tube, differential manometer, atmospheric pressure
Detection device, temperature-detecting device, air humidity detection device；
Pitot tube jack for installing Pitot tube is also provided on the pipe fitting side wall, for installing sensor to be measured
Sensor jack, and the Pitot tube jack, sensor jack are respectively positioned on the air side of current stabilization strainer, with the hollow flow of air of pipe fitting
Direction be after, the blower is located at the front of current stabilization strainer, alternatively, the blower is located at Pitot tube jack and sensor jack
Rear；
The blower is connected to power supply and frequency converter；
Two limbs of the Pitot tube and two orifices of differential manometer.
One of present invention flow and air velocity transducer calibration device in practical application, use atmospheric pressure detection first
Device, temperature-detecting device, air humidity detection device detect atmospheric pressure, temperature, air humidity in calibration environment respectively, so
After calculate atmospheric density, then the dynamic pressure under different frequency converter numerical value is measured with Pitot tube, when calculating different frequency converter numerical value
Wind speed and flow at calibration point, and using calculated value as standard value, flow and air velocity transducer calibration are then carried out, relative to
The prior art, when carrying out flow and air velocity transducer calibration using this device, without the calibration equipment of purchasing expensive, without flower
Take too many calibration expense, therefore cost is relatively low, simultaneously because without send to calibration producer carry out calibration, therefore the calibration used time compared with
It is short, avoid the situation of sensor reserve level anxiety.
Optimization, the pipe fitting both ends are horn mouth, and the assembling is in pipe fitting end.
Optimization, the Pitot tube jack, sensor jack are respectively positioned between blower and current stabilization strainer.Pitot tube is inserted
Hole, sensor jack are arranged between blower and current stabilization strainer, and when practical calibration, blower exhausting to outside pipe fitting, wind passes through current stabilization
Using Pitot tube jack, sensor jack after strainer, finally extracted out by blower, wind flow is more steady in this type of flow
It is fixed, it is not likely to produce sinuous flow, it is ensured that calibration is more accurate.
Optimization, the current stabilization strainer is gauze or wire netting.Gauze or iron wire web frame are simple, steady flow result compared with
It is good, and cost is relatively low, is easy to obtain.
Optimization, the power supply uses regulated power supply.Regulated power supply can provide stable power supply for blower, and then ensure
Blower operating is stablized, and guarantees that calibration is accurate.
Optimization, the differential manometer uses compensate-type micropressure meter.Compensate-type micropressure meter is connect with Pitot tube, can facilitate, is quasi-
True detects pipe fitting dynamic pressure, and then convenient for calculating pipe fitting apoplexy speed and flow, prepares for the calibration of sensor.
Optimization, the atmospheric pressure detection device uses aneroid pressure meter.Aneroid pressure meter structure is simple, convenient for behaviour
Make, and it is more accurate to detect process.
Optimization, the air humidity detection device uses hygrometer.Hygrometer can facilitate detection air humidity, operation
Simply, testing result is more accurate.
Invention additionally discloses a kind of using a kind of flow described in any of the above embodiments and the mark of air velocity transducer calibration device
Calibration method includes the following steps:
S1, it is detected in calibration environment respectively with atmospheric pressure detection device, temperature-detecting device, air humidity detection device
Atmospheric pressure P, temperature T, air humidity φ；
S2, calibration surrounding air density, formula are calculated are as follows:
This for formula 1., in which:
ρ-atmospheric density, kg/m3；P-atmospheric pressure, Pa；T-absolute temperature, K, T=273+t, t-environment celsius temperature
Degree, DEG C；- air humidity, %；PIt is full- full Heshui steam pressure (tabling look-up to obtain), Pa；
S3, Pitot tube is inserted into Pitot tube jack, starts blower, frequency converter is adjusted to different numerical value, controlled blower and turn
Speed, and obtain dynamic pressure H of the differential manometer in different frequency converter numerical valueIt is dynamic, HIt is dynamic=HEntirely-HIt is quiet, wherein HIt is dynamic- dynamic pressure, mmH2O；HEntirely- complete
Pressure, mmH2O；HIt is quiet- static pressure, mmH2O；
Wind speed when S4, calculating different frequency converter numerical value at calibration point, formula are as follows:
This for formula 2., in which:
V-wind speed, m/s；HIt is dynamic- dynamic pressure, Pa, when calculating, by HIt is dynamicUnit by mmH2O is converted into Pa, and conversion formula is
1mmH2O=9.8Pa；C-Pitot tube cofficients, NPL standard Pitot tube, C=0.998；ρ-calibration point atmospheric density, kg/m3；
Wind speed when record calculates resulting different frequency converter numerical value at calibration point, as standard wind speed；
Flow when S5, calculating different frequency converter numerical value at calibration point, formula are as follows:
Q=60KVS
This for formula 3., in which:
Q-flow, m3/min；K-Flow Field Distribution coefficient, K=0.95~1.00；V-wind speed, m/s；S-pipe fitting internal diameter
Sectional area, m2；
Flow when record calculates resulting different frequency converter numerical value at calibration point, as normal flow；
S6, air velocity transducer calibration: it will be inserted into sensor jack to calibration air velocity transducer, and air velocity transducer will be connect
Logical probe power, starts blower, observes the wind speed show value of air velocity transducer, and compared with the calculated result in step S4
It is right, it is as a result identical, calibration when next frequency converter numerical value is carried out, if result is different, sensor remote controller operation is used, makes wind
Fast sensor enters calibration state, in the calibration page, using the calculated result in step S4 as standard value, corrects air velocity transducer
Show value, after the completion of calibration, frequency converter is adjusted to different numerical value, and is repeated the above steps, completes wind speed when different wind speed
The calibration of sensor after the completion of calibration, exits the sensor calibration page, and closure sensor power supply takes out air velocity transducer；
S7, flow sensor calibration: it will be inserted into sensor jack to calibration flow sensor, and flow sensor will be connect
Logical probe power, starts blower, observes the flow indication value of flow sensor, and compared with the calculated result in step S5
It is right, it is as a result identical, calibration when next frequency converter numerical value is carried out, if result is different, sensor remote controller operation is used, makes to flow
Quantity sensor enters calibration state, in the calibration page, using the calculated result in step S5 as standard value, and modified flow rate sensor
Show value, after the completion of calibration, frequency converter is adjusted to different numerical value, and is repeated the above steps, complete different flow when flow
The calibration of sensor after the completion of calibration, exits the sensor calibration page, and closure sensor power supply takes out flow sensor, and closes
Close blower.
Optimization, before carrying out step S6 and S7, the result of calculating is tested respectively with the accurate sensor of measured value
Card, it is accurate that error then calculates within 5%, and error is more than 5% repetition step S1-S5, and re-starts verifying, until error
Within 5%.
Using a kind of above-mentioned flow and air velocity transducer Calibration Method, different frequency conversions theoretically can be accurately calculated
Wind speed and flow in the case of device numerical value, and in this, as standard value, then in different frequency converter numerical value, by sensor
Numerical value is adjusted to standard value, and the calibration to flow and air velocity transducer can be realized, and this method is set without the calibration of purchasing expensive
Standby, without the too many calibration expense of cost, therefore cost is relatively low, simultaneously because calibration is carried out without sending to calibration producer, because
This calibration used time is shorter, avoids the situation of sensor reserve level anxiety.
The beneficial effects of the present invention are:
1. one of present invention flow and air velocity transducer calibration device with atmospheric pressure in practical application, examined first
It surveys device, temperature-detecting device, air humidity detection device and detects atmospheric pressure, temperature, air humidity in calibration environment respectively,
Then atmospheric density is calculated, then the dynamic pressure under different frequency converter numerical value is measured with Pitot tube, calculates different frequency converter numerical value
When calibration point at wind speed and flow then carry out flow and air velocity transducer calibration, relatively and using calculated value as standard value
In the prior art, when carrying out flow and air velocity transducer calibration using this device, without the calibration equipment of purchasing expensive, without
Too many calibration expense is spent, therefore cost is relatively low, simultaneously because carrying out calibration, therefore calibration used time without sending to calibration producer
It is shorter, avoid the situation of sensor reserve level anxiety.
2. Pitot tube jack, sensor jack are arranged between blower and current stabilization strainer, when practical calibration, blower is to pipe
The outer exhausting of part, wind after current stabilization strainer by blower by, using Pitot tube jack, sensor jack, finally being extracted out, this flowing
Wind flow is relatively stable in mode, is not likely to produce sinuous flow, it is ensured that calibration is more accurate.
3. gauze or iron wire web frame are simple, steady flow result is preferable, and cost is relatively low, is easy to obtain.
4. regulated power supply can provide stable power supply for blower, and then ensure that blower operating is stablized, guarantee that calibration is accurate.
5. compensate-type micropressure meter is connect with Pitot tube, can conveniently, accurate detection goes out pipe fitting dynamic pressure, and then is convenient for computer tube
Wind speed and flow in part are prepared for the calibration of sensor.
6. aneroid pressure meter structure is simple, convenient for operation, and it is more accurate to detect process.
7. hygrometer can facilitate detection air humidity, easy to operate, testing result is more accurate.
8. using a kind of above-mentioned flow and air velocity transducer Calibration Method, different changes theoretically can be accurately calculated
Wind speed and flow in the case of frequency device numerical value, and in this, as standard value, then in different frequency converter numerical value, it will sense
Device numerical value is adjusted to standard value, and the calibration to flow and air velocity transducer can be realized, and this method is not necessarily to the calibration of purchasing expensive
Equipment, without the too many calibration expense of cost, therefore cost is relatively low, simultaneously because calibration is carried out without sending to calibration producer,
Therefore the calibration used time is shorter, avoids the situation of sensor reserve level anxiety.
Detailed description of the invention
Fig. 1 is flow a kind of in the embodiment of the present invention and the schematic diagram of air velocity transducer calibration device；
Wherein,
Pipe fitting -1, Pitot tube jack -11, sensor jack -12；
Blower -2；
Current stabilization strainer -3；
Power supply -4；
Frequency converter -5.
Specific embodiment
The present invention is described in detail below in conjunction with attached drawing.
In the description of the present invention, it should be noted that the instructions such as term " on ", "lower", "left", "right", "horizontal"
Orientation or positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and simplification is retouched
It states, rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation,
Therefore it is not considered as limiting the invention.
Embodiment one:
As shown in Figure 1, a kind of flow and air velocity transducer calibration device, including pipe fitting 1, blower 2, current stabilization strainer 3, power supply
4, frequency converter 5 further include Pitot tube, differential manometer, atmospheric pressure detection device, temperature-detecting device, air humidity detection device
(not shown).
The pipe fitting 1 is round tube, and pipe fitting 1 uses internal diameter for the Standard fittings of 250mm in the present embodiment, and both ends are loudspeaker
Mouth, the blower 2 are mounted on 1 right part of pipe fitting, and current stabilization strainer 3 is mounted on inside 1 left end of pipe fitting, and current stabilization strainer 3 is vertical
In the axis of pipe fitting 1.
Pitot tube jack 11 for installing Pitot tube is also provided on 1 side wall of pipe fitting, for installing sensing to be measured
The sensor jack 12 of device, and the Pitot tube jack 11, sensor jack 12 are respectively positioned on the air side of current stabilization strainer 3, with pipe
After the direction of the hollow flow of air of part 1 is, the blower 2 is located at the front of current stabilization strainer 3, alternatively, the blower 2 is located at Pitot tube
The rear of jack 11 and sensor jack 12, in the present embodiment, the Pitot tube jack 11, sensor jack 12 are respectively positioned on blower
Between 2 and current stabilization strainer 3.
The current stabilization strainer 3 is gauze or wire netting, and the power supply 4 uses regulated power supply.
The blower 2 is connected to power supply 4 and frequency converter 5, two limbs of "+", "-" of the Pitot tube and differential manometer
Two "+", "-" orifices.
The differential manometer uses compensate-type micropressure meter, and the atmospheric pressure detection device uses aneroid pressure meter, the sky
Gas humidity detector uses hygrometer.
Embodiment two:
Invention additionally discloses a kind of a kind of calibrations using flow and air velocity transducer calibration device described in embodiment one
Method includes the following steps:
S1, it is detected in calibration environment respectively with atmospheric pressure detection device, temperature-detecting device, air humidity detection device
Atmospheric pressure P, temperature T, air humidity φ；
S2, calibration surrounding air density, formula are calculated are as follows:
This for formula 1., in which:
ρ-atmospheric density, kg/m3；P-atmospheric pressure, Pa；T-absolute temperature, K, T=273+t, t-environment celsius temperature
Degree, DEG C；- air humidity, %；PIt is full- full Heshui steam pressure (tabling look-up to obtain), Pa；
S3, Pitot tube is inserted into Pitot tube jack 11, starts blower 2, frequency converter 5 is adjusted to different numerical value, wind is controlled
2 revolving speed of machine, and obtain dynamic pressure H of the differential manometer in different 5 numerical value of frequency converterIt is dynamic, HIt is dynamic=HEntirely-HIt is quiet, wherein HIt is dynamic- dynamic pressure, mmH2O；
HEntirely- total pressure, mmH2O；HIt is quiet- static pressure, mmH2O；
Wind speed when S4, calculating different 5 numerical value of frequency converter at calibration point, formula are as follows:
This for formula 2., in which:
V-wind speed, m/s；HIt is dynamic- dynamic pressure, Pa, when calculating, by HIt is dynamicUnit by mmH2O is converted into Pa, and conversion formula is
1mmH2O=9.8Pa；C-Pitot tube cofficients, NPL standard Pitot tube, C=0.998；ρ-calibration point atmospheric density, kg/m3；
Wind speed when record calculates resulting different 5 numerical value of frequency converter at calibration point, as standard wind speed；
By experiment, the atmospheric density range of measurement point is 1.18-1.22kg/m3, therefore 2. formula can be optimized are as follows:This for formula 4., wherein HIt reads- compensate-type micropressure meter survey measurements, mmH2O；Since underground site measures
Required precision be not it is especially high, to meet underground demand, while in order to improve calibration efficiency, when practical application, is public using experience
4. formula is quickly calculated, and carry out calibration to sensor using this calculated result as standard value；
Flow when S5, calculating different 5 numerical value of frequency converter at calibration point, formula are as follows:
Q=60KVS
This for formula 3., in which:
Q-flow, m3/min；K-Flow Field Distribution coefficient, K=0.95~1.00；V-wind speed, m/s；1 internal diameter of S-pipe fitting
Sectional area, m2, the internal diameter sectional area of pipe fitting 1 described in the present embodiment is 0.049m2；
Flow when record calculates resulting different 5 numerical value of frequency converter at calibration point, as normal flow；
Next, with measured value, accurately new air velocity transducer and new pipeline flow sensor respectively carry out the result of calculating
Verifying, it is accurate that error then calculates within 5%, and error is more than 5% repetition step S1-S5, and re-starts verifying, until accidentally
Difference is within 5%.
Specifically, wind speed measurement calculated result is as shown in table 1:
1 wind speed measured value contrast table of table
As shown in Table 1, calibration device is measured air speed value and the show value error of new air velocity transducer 5% or so,
Only the 1st group of data exceed error range, in the underground survey not high to required precision, it is believed that and it meets industry technology requirement,
Next calibration can be carried out, in addition, if lower to error requirements, repeatedly step S1-S5, and verifying is re-started, until
Error is within 5%.
Flow detection calculated result is as shown in table 2:
2 pipeline flow measured value statistical form of table
Pass through 2 data comparison of table, it can be deduced that the pipeline flow value and new pipeline flow sensor that calibration device is measured
Show value error is 5% or so, and only the 1st group of data exceed error range, in the underground survey not high to required precision, it is believed that
It meets industry technology requirement, can carry out next calibration, in addition, if lower to error requirements, repeatedly step S1-S5,
And verifying is re-started, until error is within 5%.
Calculated result meets industry requirement, next can then carry out the calibration work of sensor:
S6, air velocity transducer calibration: it will be inserted into sensor jack 12 to calibration air velocity transducer, and by air velocity transducer
Connect probe power, start blower 2, observe the wind speed show value of air velocity transducer, and with the calculated result in step S4 into
Row compares, as a result identical, carries out calibration when next 5 numerical value of frequency converter, if result is different, uses sensor remote controller operation,
Air velocity transducer is set to enter calibration state, in the calibration page, using the calculated result in step S4 as standard value, amendment wind speed is passed
The show value of sensor after the completion of calibration, frequency converter 5 is adjusted to different numerical value, and is repeated the above steps, when completing different wind speed
The calibration of air velocity transducer after the completion of calibration, exits the sensor calibration page, and closure sensor power supply takes out air velocity transducer；
S7, flow sensor calibration: it will be inserted into sensor jack 12 to calibration flow sensor, and by flow sensor
Connect probe power, start blower 2, observe the flow indication value of flow sensor, and with the calculated result in step S5 into
Row compares, as a result identical, carries out calibration when next 5 numerical value of frequency converter, if result is different, uses sensor remote controller operation,
Flow sensor is set to enter calibration state, in the calibration page, using the calculated result in step S5 as standard value, modified flow rate is passed
After the completion of calibration, frequency converter 5 is adjusted to different numerical value, and is repeated the above steps for the show value of sensor, when completing different flow
The calibration of flow sensor after the completion of calibration, exits the sensor calibration page, and closure sensor power supply takes out flow sensor,
And close blower 2.
In addition, in practical calibration, calibration twice can be carried out to guarantee that calibration is accurate, to ensure that calibration is accurate, reliable.
Working principle:
Calibration environment is detected respectively with atmospheric pressure detection device, temperature-detecting device, air humidity detection device first
Then middle atmospheric pressure, temperature, air humidity calculate atmospheric density, then measured under different 5 numerical value of frequency converter with Pitot tube
Dynamic pressure, wind speed and flow when calculating different 5 numerical value of frequency converter at calibration point, and using calculated value as standard value, with laggard
Row flow and air velocity transducer calibration, compared with the existing technology, when carrying out flow and air velocity transducer calibration using this device, nothing
The calibration equipment for needing purchasing expensive, without the too many calibration expense of cost, therefore cost is relatively low, simultaneously because without sending to mark
School producer carries out calibration, therefore the calibration used time is shorter, avoids the situation of sensor reserve level anxiety.
By the flow and air velocity transducer calibration device and Calibration Method of development, it is more to realize colliery scene independence calibration
The demand of type wind speed and pipeline flow sensor saves time required by former calibration and fund.Before this, pipeline stream
Quantity sensor returns the emblem mark school period and is generally 30 days, calibration expense, by taking luminous power produces circulation auto-excitation type automatic gauge as an example, 3000
Member/set.After calibration device investment, pipeline flow sensor is cleaned by overhauling employee, is overhauled, calibration, storage once gug
Equal work, 6 hours can be completed, and not generate calibration expense, and the sensor measurement errors after calibration meet national phase
Pass standard.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of flow and air velocity transducer calibration device, it is characterised in that: including pipe fitting (1), the wind being mounted on pipe fitting (1)
Machine (2) and current stabilization strainer (3), power supply (4), frequency converter (5), Pitot tube, differential manometer, atmospheric pressure detection device, temperature detection
Device, air humidity detection device；
Pitot tube jack (11) for installing Pitot tube is also provided on pipe fitting (1) side wall, for installing sensing to be measured
The sensor jack (12) of device, and the Pitot tube jack (11), sensor jack (12) are respectively positioned on the outlet air of current stabilization strainer (3)
Side, after the direction with pipe fitting (1) hollow flow of air is, the blower (2) is located at the front of current stabilization strainer (3), alternatively, the wind
Machine (2) is located at the rear of Pitot tube jack (11) and sensor jack (12)；
The blower (2) is connected to power supply (4) and frequency converter (5)；
Two limbs of the Pitot tube and two orifices of differential manometer.
2. a kind of flow according to claim 1 and air velocity transducer calibration device, it is characterised in that: the pipe fitting (1)
Both ends are horn mouth, and the blower (2) is mounted on pipe fitting (1) end.
3. a kind of flow according to claim 1 or 2 and air velocity transducer calibration device, it is characterised in that: the Pitot
Pipe jack (11), sensor jack (12) are respectively positioned between blower (2) and current stabilization strainer (3).
4. a kind of flow according to claim 1 and air velocity transducer calibration device, it is characterised in that: the current stabilization strainer
It (3) is gauze or wire netting.
5. a kind of flow according to claim 1 and air velocity transducer calibration device, it is characterised in that: the power supply (4)
Using regulated power supply.
6. a kind of flow according to claim 1 and air velocity transducer calibration device, it is characterised in that: the differential manometer is adopted
Use compensate-type micropressure meter.
7. a kind of flow according to claim 1 and air velocity transducer calibration device, it is characterised in that: the atmospheric pressure
Detection device uses aneroid pressure meter.
8. a kind of flow according to claim 1 and air velocity transducer calibration device, it is characterised in that: the air humidity
Detection device uses hygrometer.
9. a kind of calibration side using such as a kind of described in any item flows of claim 1-8 and air velocity transducer calibration device
Method, characterized by the following steps:
S1, atmosphere in calibration environment is detected respectively with atmospheric pressure detection device, temperature-detecting device, air humidity detection device
Pressure P, temperature T, air humidity φ；
S2, calibration surrounding air density, formula are calculated are as follows:
This for formula 1., in which:
ρ-atmospheric density, kg/m3；P-atmospheric pressure, Pa；T-absolute temperature, K, T=273+t, t-environment celsius temperature, DEG C；- air humidity, %；PIt is full- full Heshui steam pressure (tabling look-up to obtain), Pa；
S3, Pitot tube is inserted into Pitot tube jack (11), started blower (2), frequency converter (5) is adjusted to different numerical value, control
Blower (2) revolving speed, and obtain dynamic pressure H of the differential manometer in different frequency converters (5) numerical valueIt is dynamic, HIt is dynamic=HEntirely-HIt is quiet, wherein HIt is dynamic- dynamic pressure,
mmH2O；HEntirely- total pressure, mmH2O；HIt is quiet- static pressure, mmH2O；
Wind speed when S4, calculating different frequency converter (5) numerical value at calibration point, formula are as follows:
This for formula 2., in which:
V-wind speed, m/s；HIt is dynamic- dynamic pressure, Pa, when calculating, by HIt is dynamicUnit by mmH2O is converted into Pa, conversion formula 1mmH2O
=9.8Pa；C-Pitot tube cofficients, NPL standard Pitot tube, C=0.998；ρ-calibration point atmospheric density, kg/m3；
Wind speed when record calculates resulting different frequency converter (5) numerical value at calibration point, as standard wind speed；
Flow when S5, calculating different frequency converter (5) numerical value at calibration point, formula are as follows:
Q=60KVS
This for formula 3., in which:
Q-flow, m3/min；K-Flow Field Distribution coefficient, K=0.95~1.00；V-wind speed, m/s；S-pipe fitting (1) internal diameter is cut
Area, m2；
Flow when record calculates resulting different frequency converter (5) numerical value at calibration point, as normal flow；
S6, air velocity transducer calibration: it will be inserted into sensor jack (12) to calibration air velocity transducer, and air velocity transducer will be connect
Logical probe power starts blower (2), observes the wind speed show value of air velocity transducer, and with the calculated result in step S4 into
Row compares, as a result identical, carries out calibration when next frequency converter (5) numerical value, if result is different, is grasped with sensor remote controler
Make, air velocity transducer is made to enter calibration state, in the calibration page, using the calculated result in step S4 as standard value, corrects wind
After the completion of calibration, frequency converter (5) is adjusted to different numerical value, and is repeated the above steps for the show value of fast sensor, is completed different
The calibration of air velocity transducer when wind speed after the completion of calibration, exits the sensor calibration page, and closure sensor power supply takes out wind speed
Sensor；
S7, flow sensor calibration: it will be inserted into sensor jack (12) to calibration flow sensor, and flow sensor will be connect
Logical probe power starts blower (2), observes the flow indication value of flow sensor, and with the calculated result in step S5 into
Row compares, as a result identical, carries out calibration when next frequency converter (5) numerical value, if result is different, is grasped with sensor remote controler
Make, flow sensor is made to enter calibration state, in the calibration page, using the calculated result in step S5 as standard value, amendment stream
After the completion of calibration, frequency converter (5) is adjusted to different numerical value, and is repeated the above steps for the show value of quantity sensor, is completed different
The calibration of flow sensor when flow after the completion of calibration, exits the sensor calibration page, and closure sensor power supply takes out flow
Sensor, and close blower (2).
10. a kind of flow according to claim 9 and air velocity transducer calibration device, it is characterised in that: carrying out step
Before S6 and S7, the result of calculating is verified respectively with the accurate sensor of measured value, error then calculates standard within 5%
Really, error is more than 5% repetition step S1-S5, and re-starts verifying, until error is within 5%.
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