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JJF 1564-2016: Calibration Specification for Temperature and Humidity Standard Chambers
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Calibration Specification for Temperature and Humidity Standard Chambers
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JJF 1564-2016
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Basic data | Standard ID | JJF 1564-2016 (JJF1564-2016) | | Description (Translated English) | Calibration Specification for Temperature and Humidity Standard Chambers | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A54 | | Classification of International Standard | 17.220 | | Word Count Estimation | 23,284 | | Date of Issue | 2016-06-27 | | Date of Implementation | 2016-09-27 | | Quoted Standard | JJG 205-2005; JJG 993-2004; JJF 1001-2011 | | Regulation (derived from) | State Administration of Quality Supervision, No.66 of 2016 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | | Summary | This standard applies to the temperature range of 5 �� ~ 50 ��, humidity range of 10% RH ~ 90% RH metering calibration with temperature and humidity standard box calibration. | JJF 1564-2016: Calibration Specification for Temperature and Humidity Standard Chambers---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Calibration Specification for Temperature and Humidity Standard Chambers
National Metrological Technical Code of the People's Republic of China
Standard Specification for Calibration of Temperature and Humidity Standard
2016-06-27 released
2016-09-27 implementation
State Administration of Quality Supervision, Inspection and Quarantine issued
Standard Specification for Calibration of Temperature and Humidity Standard
Responsible unit. National Thermometer Technical Committee
The main drafting unit. Shanghai Institute of Metrology and Testing Technology
究 Research on Metrology and Testing Technology of Beijing Great Wall of China Aviation Industry Corporation
Institute
Participated in the drafting unit. Hebei Institute of Metrology
Qingdao Institute of Metrology and Technology
Huzhou CD Instrument Factory
This specification entrusts the National Thermometer Technical Committee to explain
The main drafters of this specification.
Zhang Wendong (Shanghai Institute of Metrology and Testing Technology)
Lv Guoyi (China Aviation Industry Corporation
Beijing Great Wall Metrology and Testing Technology Research Institute)
Participate in the drafters.
Shen Tao Tao (Shanghai Institute of Metrology and Testing Technology)
Cui Tianyun (Shanghai Institute of Metrology and Testing Technology)
Geng Rongqin (Hebei Institute of Metrology)
Guo Shenhui (Qingdao Metrology Technology Research Institute)
Chen Jian (Huzhou CD Instrument Factory)
table of Contents
Introduction (II)
1 Scope (1)
2 References (1)
3 Terms and definitions (1)
3.1 temperature and humidity standard box (1)
3.2 Effective work area (1)
3.3 Temperature uniformity (1)
3.4 Humidity uniformity (1)
3.5 Temperature fluctuation (1)
3.6 Humidity fluctuation (1)
3.7 Temperature change rate (1)
3.8 Humidity change rate (1)
4 Overview (2)
5 Metrological characteristics (2)
5.1 Temperature and humidity uniformity (2)
5.2 Temperature and humidity fluctuation (2)
5.3 Change in temperature and humidity (2)
6 Calibration conditions (2)
6.1 Environmental conditions (2)
6.2 Measurement standards and other equipment (2)
7 Calibration items and calibration methods (3)
7.1 Calibration items (3)
7.2 Calibration method (3)
7.3 Calibration results (8)
7.4 Recurrence time interval (8)
Appendix A Calibration Certificate Inside Page Reference Format (9)
Appendix B Temperature and humidity standard box temperature uniformity of the measurement results of the uncertainty assessment (10)
Appendix C Evaluation of Uncertainty in Measurement of Moisture Uniformity of Temperature and Humidity Tank (13)
Appendix D Temperature and humidity standard box temperature fluctuation and temperature change rate of the measurement results of the uncertainty assessment (16)
Introduction
This specification is based on JJF 1071-2010 "national measurement calibration rules to write rules", JJF 1001-2011 "pass
Metrological terms and definitions "and JJF 1059.1-2012" Measurement Uncertainty Assessment and Representation "
Fan prepared by.
This specification is the first release.
Standard Specification for Calibration of Temperature and Humidity Standard
1 Scope
This specification applies to the temperature range of 5 ℃ ~ 50 ℃, humidity range of 10% RH ~ 90% RH of the measurement calibration temperature
Calibration of humidity standard box.
2 reference file
This specification refers to the following documents.
Mechanical hygrometer of JJG205-2005
Electric ventilation and hygrometers JJG993-2004
Standard Terminology and Definitions for JJF 1001-2011
For dated references, only the dated edition applies to this specification; references that are not dated
, The latest version (including all modifications) applies to this specification.
3 terms and definitions
3.1 temperature and humidity standard box temperatureandhumiditystandardchamber
Used to test or calibrate the temperature and temperature and humidity of the special equipment, it can be based on temperature, humidity and other parameters set
Value in its effective work area to produce the required temperature and humidity environment.
3.2 Valid work area validworkingzone
The area used to calibrate or calibrate the temperature and humidity meter.
3.3 temperature uniformity
Temperature and humidity box to reach the specified stabilization time within 30min, the effective work area around the point and the center of the point
The maximum value of the absolute value of the temperature difference between any one moment.
3.4 humidity uniformity humidityuniformity
Temperature and humidity box to reach the specified stabilization time within 30min, the effective work area around the point and the center of the point
The maximum value of the absolute value of the humidity difference between any one moment.
3.5 temperature fluctuation temperaturefluctuation
After the temperature and humidity box reaches the specified settling time, the effective temperature in the effective working area is within 30min
(With "±" means, take the difference of 1/2).
3.6 Humidity fluctuation humidityfluctuation
After the temperature and humidity box reaches the specified stabilization time, the effective working area of the center point humidity within 30min
(With "±" means, take the difference of 1/2).
3.7 temperature change rate temperaturechangerate
After the temperature and humidity box reaches the specified settling time, the effective working area center temperature is within 30min every 1min
The maximum value of the very poor, expressed in ° C/min.
3.8 humidity change rate humiditychangerate
After the temperature and humidity box reaches the specified settling time, the effective working area center point humidity within 30min every 1min
The maximum value of the very poor, expressed in% RH/min.
4 Overview
The role of temperature and humidity standard box is based on the temperature and humidity settings to produce a constant and uniform temperature and humidity field, for verification,
Calibration of mechanical pointer temperature hygrometer, temperature and humidity recorder, electric ventilation and dry table, probe built-in temperature and temperature and humidity
Sensors, probe built-in temperature and temperature and humidity data acquisition instrument, thermal index instrument and other temperature and temperature and humidity measurement instruments.
Temperature and humidity box can use different working principle, the current mainly for the double temperature method, thermostat and humidity two types.
The principle of the double-temperature method is through the use of lower temperature water on the air spray, bubbling, etc. to produce the temperature
(I.e., a saturated process), and then the moisture is heated to a predetermined temperature (i.e., a heating process), thereby
Get the required temperature and relative humidity of the moisture. The air inside the box is generally closed loop, its saturation process and heating too
Cheng Zhou repeated, alternating.
The principle of temperature regulation and humidity regulation is through the temperature and humidity measurements within the box feedback control, the use of steam or spray
Humidification, refrigeration or desiccant dehumidification, etc. to achieve the box temperature and humidity control. The temperature and humidity measurements are mainly used wet and dry
Ball temperature hygrometer, polymer capacitance humidity sensor or precision dew point meter to achieve.
5 measurement characteristics
5.1 temperature and humidity uniformity
Temperature and humidity box temperature uniformity is generally not greater than 0.3 ℃, humidity uniformity is generally not greater than 1.0% RH.
5.2 temperature and humidity fluctuations
Temperature and humidity box temperature fluctuations generally do not exceed ± 0.2 ℃, humidity volatility is generally not more than ± 0.8% RH.
5.3 temperature and humidity rate of change
Temperature and humidity box temperature change rate is generally not greater than 0.2 ℃/min, humidity change rate is generally not greater than
0.8% RH/min.
Note. The above indicators are not used for qualifying, for reference only.
6 calibration conditions
6.1 Environmental conditions
6.1.1 Temperature. 15 ℃ ~ 25 ℃, humidity. ≤ 75% RH.
6.1.2 The temperature fluctuation shall not exceed ± 3 ° C.
6.1.3 The environmental conditions shall also meet the other requirements for the normal use of the standard and other ancillary equipment.
6.2 Measurement standards and other equipment
6.2.1 multi-channel temperature and humidity measurement device
6.2.1.1 Device configuration
The number of temperature and humidity sensors in the device should meet the requirements of the cloth, each road should be used the same type of temperature specifications
Sensor and humidity sensor, the device should be equipped with automatic recording function, the minimum recording time interval should not be greater than 20s.
6.2.1.2 Technical indicators
The temperature and humidity of each device are shown in Table 1.
Table 1 multi-channel temperature and humidity measurement device
Item Measurement range Resolution Maximum allowable error Repeatability response time
Temperature 5 ℃ ~ 50 ℃ not less than 0.01 ℃ ± 0.20 ℃ ≤0.01 ℃ ≤ 15s
Humidity 10% RH ~ 90% RH (at 20 ℃) Not less than 0.1% RH ± 2.0% RH ≤0.05% RH ≤15s
Note.
1. Temperature and humidity measurement range for the general requirements, the use of the temperature and humidity can be covered by the actual calibration range shall prevail.
2. Technical indicators are the overall indicators that include sensors and acquisition equipment.
3. Repeatability is the standard deviation obtained by repeating the measurement 10 times.
4. Before use, each temperature should be calibrated on the same set of temperature standard devices, each humidity should be in the same
Set the humidity standard device for calibration. After the device is used, its stability should be reviewed, the review point is 20 ℃, 60% RH,
The results of the review should be such that the inconsistency of the temperature drift between the channels is not greater than 0.03 ° C, and the inconsistency of the humidity drift between the channels is not
Greater than 0.4% RH.
5. The measurement results of each channel should contain correction values.
7 Calibration items and calibration methods
7.1 Calibration items
a) temperature uniformity;
b) Humidity uniformity;
c) temperature fluctuation;
d) Humidity fluctuation;
e) temperature change rate;
f) Humidity change rate.
7.2 Calibration method
7.2.1 sensor layout
Before calibration, should be in accordance with the temperature and humidity box instructions or user requirements to determine the effective work area. Using multi-channel temperature and humidity
Measuring device to calibrate the temperature and humidity inside the device, the device temperature sensor and humidity sensor using the level of hierarchical distribution side
Type, the location of the cloth from the temperature and humidity box effective working area side of the distance of 8cm, the lower part of the location is located in the effective work
At the bottom of the area at the top of the horizontal 5cm, the upper part of the location of the work area is located in the top of the work area below the horizontal 20cm,
see picture 1.
Effective working area height h less than 50cm temperature and humidity box, cloth 5.00 [see Figure 1a)].
Effective working area height h between 50cm ~ 100cm between the temperature and humidity box, cloth 9.00 [see Figure 1b)].
Effective working area height h more than 100cm temperature and humidity box, cloth 13 points [see Figure 1c)].
a) h < 50cm distribution map
b) 50cm ≤ h ≤ 100cm distribution
c) h > 100cm
Figure 1 Schematic diagram of the sensor layout
For the studio there are input cold mirror dew point probe temperature and humidity box, should be appropriate to adjust the sensor location of the cloth,
So that the distance between the sensor and the dew point probe upstream of the dew point probe in the airflow in the box is not less than 5 cm,
The distance between the sensor and the dew point probe downstream of the dew point probe is not less than 20 cm.
For the effective working area there is air pressure blind area of the temperature and humidity box, you can add a point in the blind area.
7.2.2 Temperature calibration
7.2.2.1 Temperature calibration point
Temperature calibration point is generally 15 ℃, 20 ℃, 30 ℃, can also be selected according to user requirements other calibration points.
Calibration, the temperature in the order from low to high, the calibration point on the temperature deviation should be within ± 0.5 ℃ (in the
Heart temperature prevail). If you turn on the humidity function, the humidity setting is generally about 60% RH. Each calibration item
As in the no-load conditions.
7.2.2.2 Temperature calibration procedure
After the temperature and humidity box reaches the specified settling time, the temperature of each cloth point is recorded, and the recording time interval of the center point is
20s, the other points of the record time interval of 2min. The center point records 91 sets of data, the other points record the number of 16 groups
according to. 20s interval data is denoted by T'i0 (i = 1, 2,, 91), 2min interval data is denoted by Tnj (n = 1, 2,
, 16; j = 0,1, m-1), where m is the number of points, i and n represent the time sequence number (i
Interval of 20s, n time interval of 2min), j on behalf of the location of the location number. If at the specified settling time
Before the box can determine the temperature and humidity has been balanced, can also be recorded in advance.
Temperature stability time to the instructions prevail, the instructions are not given, the general principle of the following principles. the temperature
Change the amount of not more than 10 ℃, from the temperature and humidity settings to start recording data waiting for a stable time of 90min; temperature
Degree of change does not exceed 5 ℃, the settling time is 60min. The stabilization time of each calibration point is shown in Table 2.
Table 2 stabilization time
Calibration point 15 ° C 20 ° C, 40% RH 20 ° C, 60% RH 20 ° C, 80% RH 30 ° C
Stable time 90min 60min 60min 60min 90min
7.2.2.3 Temperature data processing
a) temperature uniformity
The absolute value of the absolute value of the difference between the center point position and the temperature of the other dot positions is given by the formula
(1) Calculation.
ΔTn = max Tn0 - Tnj () j = 1,2, m - 1 (1)
Where.
ΔTn --- the absolute value of the difference between the center point position and the temperature of the other position points at the nth time,
Tn0 --- the temperature at the center point of the nth time, ℃;
Tnj --- the first n, the j point of the location of the temperature, ℃;
m - the number of points.
The temperature uniformity ΔTu at this temperature point can be calculated using the formula (2)
ΔTu = max (ΔTn) n = 1, 2, 16 () (2)
Where. ΔTu --- temperature uniformity at this temperature point, ° C.
The maximum value of the temperature uniformity ΔTu of each temperature calibration point is the temperature uniformity of the temperature and humidity box.
b) temperature fluctuation
Calculate the temperature fluctuation using the center point temperature measurement, the temperature fluctuation ΔTf of the temperature calibration point is available
Formula (3) Calculation.
ΔTf = ±
2 maxTn0
() - minTn0 () [] n = 1,2, 16 () (3)
Where.
ΔTf --- temperature fluctuation at this temperature point, ℃;
Tn0 --- the temperature at the center point of the nth time, ° C.
The maximum value of the temperature fluctuation ΔTf at each temperature calibration point is the temperature fluctuation of the temperature and humidity box.
c) temperature change rate
Calculate the temperature change rate using the center point temperature measurement result T'i0 (i = 1,2,, 91), first calculate within 30min
Every 1min within the temperature is very poor, and then seek the maximum value.
The temperature difference in the first kmin can be calculated by the formula (4), that is, the calculation of the first kmin interval 20s 4 times
The difference between the maximum and the minimum of the result.
Δtvk = max (T'i0) -min (T'i0) (i = 3k-2,3k-1,3k, 3k1) (4)
Where.
ΔTvk --- the temperature within kmin is extremely poor, ℃;
T'i0 --- the temperature of the center point of the i-th moment, ℃.
The temperature change rate ΔTv of the temperature calibration point can be calculated by the formula (5)
ΔTv = max (Tvk) (k = 1, 2, 30) (5)
Where. ΔTv --- temperature change rate at this temperature point, ℃.
The maximum value of the temperature change rate ΔTv at each temperature calibration point is the temperature change rate of the temperature and humidity chamber.
7.2.3 Humidity calibration
7.2.3.1 Humidity calibration point
The humidity is calibrated at 20 ° C with a calibration point of 40% RH, 60% RH, 80% RH,
Requires selection of other calibration points. Calibration, the humidity from low to high humidity, the calibration point on the humidity deviation does not exceed
± 2.0% RH (based on the center of the humidity), humidity calibration and temperature calibration can be carried out at the same time.
7.2.3.2 Humidity Calibration Procedure
After the temperature and humidity box reaches the specified settling time, the humidity of each cloth point is recorded, and the recording time interval of the center point is
20s, the other points of the record time interval of 2min. The center point records 91 sets of data, the other points record the number of 16 groups
according to. The 20s interval data is represented by H'i0 (i = 1, 2,, 91), and 2min interval data are calculated using Hnj (n = 1, 2,
j = 0,1, m -1), where m is the number of points, i and n represent the time sequence number
(i time interval of 20s, n time interval of 2min), j said the location of the distribution number. If in the prescribed stability
Before the time to determine the temperature and humidity within the box has been balanced, can also be recorded in advance.
Humidity stability time to the instructions shall prevail, the instructions are not given, it is generally the following principles. in the box
When the internal temperature is constant, the humidity change amount does not exceed 20% RH, waiting from the set to the start recording data
The settling time is 60 min. The stabilization time of each calibration point is shown in Table 2.
7.2.3.3 Humidity data processing
a) Humidity uniformity
The absolute value of the absolute value of the difference between the humidity of the cloth position and the humidity at the center point at the nth hour is the maximum value
Equation (6) Calculation.
Δnn = max (| Hn0 - Hnj |) (j = 1,2, m - 1) (6)
Where.
ΔHn --- the absolute value of the difference between the center point position at the n-th time and the humidity of the other positions
Value,% RH;
Hn0 - the humidity value at the center point of the nth hour,% RH;
Hnj --- the nth time, the j point of the location of the humidity value,% RH;
m - the number of points.
The humidity uniformity ΔHu on the humidity calibration point is calculated using equation (7).
ΔHu = maxΔHn () n = 1,2, 16 () (7)
Where. ΔHu - humidity uniformity at this humidity point,% RH.
The maximum value of the humidity uniformity ΔHu of each humidity calibration point is the humidity uniformity of the temperature and humidity box.
b) Humidity fluctuation
The humidity fluctuation is calculated by the center point humidity measurement, and the humidity fluctuation ΔHf of the humidity calibration point is
Formula (8) Calculation.
ΔHf = ±
2 maxHn0
() - minHn0 () [] n = 1,2, 16 () (8)
Where.
ΔHf --- humidity fluctuation at this temperature point,% RH;
Hn0 --- the humidity at the center point of the nth hour,% RH.
The maximum value of the humidity fluctuation ΔHf of each humidity calibration point is the humidity fluctuation of the temperature and humidity box.
c) Humidity change rate
The humidity change rate is calculated by using the center point humidity measurement result H'i0 (i = 1, 2,, 91)
Within the humidity within every 1min very poor, and then seek the maximum value.
The temperature difference in the kmin can be calculated by the formula (9), that is, the calculation of the first kmin interval of 20s 4 times
The difference between the maximum and the minimum of the result.
ΔHvk = max (H'i0) -min (H'i0) (i = 3k-2,3k-1,3k, 3k1) (9)
Where.
ΔHvk --- the humidity in the first kmin is extremely poor,% RH;
H'i0 --- the humidity at the center point of the i-th moment,% RH.
The humidity change rate ΔHv of the humidity calibration point can be calculated by the formula (10)
ΔHv = max (ΔHvk) (k = 1, 2, 30) (10)
Where. ΔHv --- the temperature change rate at this humidity point,% RH.
The maximum value of the humidity change rate ΔHv at each humidity calibration point is the humidity change rate of the temperature and humidity chamber.
7.3 Calibration results are expressed
The calibrated temperature and humidity standard box should be issued with a calibration certificate, the certificate should include at least the following information.
a) Title. calibration certificate;
b) laboratory name and address;
c) the location of the calibration (as opposed to the laboratory);
d) the identity of the certificate (such as number), the identity of each page and the total number of pages;
e) the name and address of the customer;
f) Name of temperature and humidity box, manufacturer, model specification, number;
g) the date of calibration;
h) the identification of the technical specifications on which the calibration is based, including the name and code;
i) the traceability and validity of the meas...
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