Verification Regulation of Analogue Temperature Indicators and Controllers
Some standard content:
National Metrology Verification Regulation of the People's Republic of China JJG951—2000
Analog Temperature Indicating Controllers
Analngue Temperature Indicators and Controllers
Promulgated on 2000-05-08
Implementation on 2000-10-01
Promulgated by the State Administration of Quality and Technical Supervision
JJG951—2000
Analog Temperature Indicators and Canirollers
Verification Regulation
VerificationRcgulation of Analog Temperature Indicators and Canirollers L.IG 951-2000
This regulation was approved by the State Administration of Quality and Technical Supervision on May 8, 2000 and came into effect on October 1, 2000.
Responsible unit: Enterprise 1 Metrology Technical Committee Main drafting unit: Shanghai Metrology and Testing Technology Research Institute Hangzhou Quality Metrology Supervision Center
Participating drafting unit: Hangzhou Jingda Electronic Technology Co., Ltd. This regulation is entrusted to the Metrology Technical Committee of Hangzhou Jingda Electronic Technology Co., Ltd. The main drafters of this regulation are:
Zhu Jialiang
Lu Zhongbi
Xumura Hisashi
Art Drafting:
Xu Chenghui
JG951—2000
(Shanghai Metrology and Testing Technology Research Institute)
(Gonghai Metrology and Testing Technology Research Institute) (Hangzhou Quality Metrology and Testing Center)
【Hangzhou Quality Metrology and Testing Center)
【Hangzhou Jingda Electronic Technology Co., Ltd. Electronic Technology Company
【Hangzhou Jing Electronic Technology Company）
1Fan Si
2Technology·
2.1Nominal power value
2.2Set point error
That is, change value…
Switch single
When the same situation (p)
Nonlinear system teaching (r)
Li Shangqi·
Proportional market
Re-adjustment time (integral time)
Pre-adjustment time (differential time)
Interference coefficient
Disk performance requirements
JJG951—2000
Indication basic error (maximum allowable error)
4.2Return error (same difference)
Requirements for position control instruments||tt ||4.4 Requirements for time-proportional control instruments
Requirements for continuous and intermittent (two-position) proportional-integral-differential control instruments
5 General technical requirements
Appearance
5.2 Insulation resistance
5.3 Temperature
6 Control of measuring instruments
6.1 Verification conditions
6.2 Verification items
6.3 Verification methods
6.4 Processing of verification results
6.5 Verification cycle
J.1G:9512000
Appendix 4 Several points on the verification of time-proportional control instruments Appendix B Proportional section, Graphical method for re-adjustment time and pre-adjustment time verification C Analog overflow 1. Verification record of indicating and regulating instrument Attached with symbols of this procedure
Attached with examples of error analysis
1. Scope
JJG9512000
Verification procedure for analog temperature indicating and regulating instruments This procedure is applicable to the previous verification, continued verification and ongoing inspection of analog temperature indicating and regulating instruments equipped with thermoelectric or thermal resistance. It is applicable to the verification of analog indicating and regulating instruments that use direct voltage, voltage and resistance as analog electrical input signals and other physical variables. Analog temperature indicating and indicating instruments (hereinafter referred to as instruments) include instruments that do not linearize the input electrical signals, and also include instruments that use equal scale after linearization of the input electrical signals (such as optical indicating instruments and linear scale indicating instruments)! These instruments can be of the form of display, disk-mounted and portable type. 2. Terminology
The following terms apply to this procedure.
2.1 Nominal voltage value
Thermoelectric potential (or resistance) value corresponding to each temperature point in the thermocouple (or thermal resistor) graduation table. 2.2 Set point error
When the output variable is input according to the specified input, the difference between the measured input voltage value and the nominal voltage value corresponding to the set temperature, the setting table for linearizing the input signal, should be the difference between the measured actual input value and the set expected value. 2.3 Switching value
In the E stroke (or down stroke) of the position control instrument, the measured input (voltage) value when the output changes from one state to another,
2.4 Switching difference
[., the difference between the average switching value obtained when the down stroke is obtained.
2.5 Time ratio (p)
and time proportionality output, ... - the ratio of the duration of a cycle pulse to the duration and the interval time:, the lower limit theoretical value should be equal to 1 and 02.6 Nonlinear coefficient (r)
In quasi-time proportional action, the average proportional gain and time ratio. 0.5 The ratio of the difference in proportional gain to the average proportional gain.
2.7≤cycle
In time proportional action, when the duration of a cycle pulse is equal to the interval time, the sum of the measured duration and interval time is
2.8 Proportional band
Also known as proportional range Due to proportional control, the input change required for the output to produce a full range change (expressed as a fraction below)
2. Re-adjustment time (extreme time)
.IJC 951—2000
For instruments with proportional-integral action, when the input variable is given as a step change, the re-measurement time is the time required for the output variable to reach twice the change value obtained immediately after the step is applied. 2.10 Pre-adjustment time (differential time)
For instruments with proportional-differential action, when the input variable is given as a ramp-like (constant speed) change, the adjustment time is the time required for the output variable to reach twice the change value obtained immediately after the ramp is applied: 2.11 Static
For instruments with proportional-integral-differential action: When the output is in a steady state, the input The difference between the mean value and the nominal value corresponding to the set temperature: For instruments that require linearization of input electrical signals, it should be the difference between the actual input value measured in steady state and the set expected value,
2.12 About interference coefficient
For instruments with multiple control functions, the coefficients of each characteristic that affect each other 3 Overview
The meter is equipped with thermocouples and thermal resistors to measure temperature, supplemented by corresponding actuators to form a control system. When it accepts standardized analog DC signals or other sensors that produce resistance changes, it can measure and control other objects.
The original diagram of this table is shown in Figure 1:
Micro circuit
set delay mechanism
level amplification and
comparison mechanism
The digital mechanism
control mode
Figure 1 shows the signal receiving source diagram
where the reading mechanism is used to indicate the measured temperature. There are two ways: full range indication and differential indication, and it can be realized by pointer, color and light, etc.:
The signal output of the control mode can be divided into two types: intermittent (relay melting point and other switch signals) continuous, such as: (0~10) ⅢA and (4-20) mA and other DC power supply 1. According to the specification of the adjustment book, usually single-digit, time proportional differential (PIE), etc.,
4 Measurement performance requirements
4.1 Indication basic error (maximum allowable error) The indication error of the instrument, including the full single-range indication and the deviation indication, shall not exceed ten of the (electrical) basic range. %2
JJG 951—2000
where α is the accuracy level. It can be selected as 0.5, 1.0, 1.5, 2.0, 2.5, 4.0). Applicable: For the input electrical signal, the relative error is only shown, and the reference error is the electrical quantity. 4.2 Return error (same error)
The return error of the instrument shall not exceed 1/2 of the absolute value of the error of the indicating base card. 4.3 Requirements for position control meters
4.3.1 Set point error
The set point error of the meter shall not exceed ±"% of the (electrical) range (0.5, 1.0, 1.5, 2.0, 2.5 can be selected).
4.3.2 Initial switching error
a) The switching error is generally not greater than the (electrical) range. For instruments with a range greater than 100", it should not exceed 0.5α% of the (electrical) range.
b) For meters with adjustable switching adjustment, the switching error shall meet the requirements of the switching error adjustment range. For instruments with switching error calibration values, unless otherwise specified by the manufacturer, the deviation between the actual switching value and the switching error setting value is generally no more than ±25% of the switching error setting value.
4.4.4.1 Set point error
The set point error of the meter should not exceed (electrical) to the main ticket. (2 can be selected as 0,5, 1.0, 1.52.0, 2.5).
4.4.2 Proportional band
) The proportional band is a fixed value meter, the rated value is 4%, 21%, the actual proportional band is within the range of (1±!.25) 1 (for the rated proportional band): less than 10 (including 1%) The actual proportional band should be within the range of (1 to 0.5),
b) The batch band is a fixed range value meter, and the actual proportional band should be within this range. e) For instruments with an adjustable proportional band, the upper and lower limits of the actual proportional band should be able to cover the adjustable range. ) For instruments with a proportional band setting value, the difference between the actual proportional value and the proportional band setting value shall not exceed ±25% of the set value; for a proportional band less than 10%, the difference shall not exceed ±50% of the set value. 4.4.3 Zero cycle
) For instruments with a fixed zero cycle, the actual zero cycle of the rated value is 2.5*, 5, 10%: 205, 30s, 40s, 50, 609 seconds less than 10 (including 10) should be within the range of 110.5) [T is the same period of time]: the actual zero cycle greater than 20s (including 20s) should be within the range of (110.25)T. b) For slow instruments with a zero cycle within a specified range, the actual zero cycle should be within the specified range. c! For instruments with zero cycle adjustable range, the actual adjustment period and the lower limit should be able to cover the adjustable range. d) For instruments with zero cycle setting scale value, the deviation between the actual seasonal period and the adjustment period setting should generally not exceed ±25% of the set value: for annual cycles less than 10:, it should not exceed 250% of the set value. 4.4.4 Automatic readjustment
For instruments with automatic readjustment function, the calibration of the automatic readjustment range shall be carried out without calibration of the set point error: when the deviation is zero: the output time ratio value should be able to change between ±1 and ±2 when the automatic readjustment signal is changed. JJC 9512000
For instruments with automatic readjustment function, the calibration of the proportional band and zero cycle should be carried out near ±0.5. 4.5 Continuous and intermittent (two-position! Proportional integral differential control table requirements 4.5.1 Static error
The static error of the table should not exceed (14% of the electrical range. (You can choose 0.5, 1.0, 1.5, 2.02.5).
4.5,2 Output and its auxiliary step response
a] PD continuously controlled instrument, when the load is 1k [output (0~10mA instrument] or 500 [output (4~20)m instrument], its output current They are (0--10) mA and (4-20) mA respectively:! The error of the limit value does not exceed -1% to 13% of the output base range, and the error of the lower limit does not exceed 3% to +1% of the output base range.
hP[D intermittent instrument, the time ratio of the output end on and off [or high and low level]. The range is 0-1
In the open-loop feedback condition, the output step response of the instrument should have normal output characteristics. The output characteristics of the two lines are shown in Figure 2 (the intermediate The current of the continuous output is the standard, while the time ratio of the intermittent output is the standard.
Output characteristic curve
4.5.3 Proportional band
Longitudinal characteristic curve
a) For instruments with fixed proportional band, the actual proportional band should be within the range of (1+0.25)1: For instruments with proportional band less than 1%, the actual proportional band should be within the range of (1+0.5)P, or within the range specified by the manufacturer. For instruments with intermittent 11D control, the difference can be expanded compared with instruments with continuous [1) control:) Proportional band For instruments with adjustable proportional band, the upper and lower limits of the actual proportional band should be able to cover the adjustable range. ) Instruments with set scale value of proportional band: The deviation between the actual proportional band and the set value of proportional band is generally no more than ±50% (standard value is 5~1D). Normally, instruments with intermittent PID control generally do not exceed ±80% of the set value.
4.5.4 Readjustment time (integral time) 1
a) For instruments with set scale value of proportional band, the actual readjustment time should be within the range of (1-0.5)T, within the range specified by the manufacturer.
h) For instruments with adjustable scale value of proportional band, the upper and lower limits of the actual readjustment time should be able to cover the adjustable range. ) is an instrument with a scale value for setting the readjustment time. The deviation between the actual readjustment time and the set value of the readjustment time shall not exceed ±0% of the set value (when T is 2 min), unless otherwise specified in 4
JJG 951--2000
The manufacturer shall specify otherwise. The instrument with intermittent PID control shall generally not exceed ±80% of the set value.
4.5.5 Preset time (differential time) T
a) For instruments with fixed preset time, the actual preset time shall be within the range of (1+0.5) or the range specified by the manufacturer.
b) For instruments with adjustable preset time, the actual preset time shall be within the range of (1+0.5) or the range specified by the manufacturer.
The lower limit of the actual preset time shall be able to cover the adjustable range. ) For instruments with preset time and no calibration value, the deviation between the actual preset time and the preset time value shall not exceed ±5% of the set value unless otherwise specified by the manufacturer (when the instrument is calibrated). d) For instruments with intermittent P[T) control, the preset time shall not be calibrated. 4.6 Stability
After the instrument has been operated for 24 hours, its basic error, set point error and static error shall still meet the requirements of 4.1, 4.3.14.4.1 and 4.5.1.
5 General technical requirements
5.1 Appearance
5.1.1 The front of the meter shall be marked with the manufacturer's name or trademark, product name and unit symbol: 5.1.2 The nameplate on the meter shall indicate: model specification, accuracy grade, temperature measurement unit graduation number, factory number, manufacturing year and month and manufacturing equipment license mark (i.e. (M mark) and number. The information on the nameplate shall not be easily lost: 5.3 The scale and terminal of the meter. The text, numbers and symbols on the nameplate shall be accurate, clear and distinct, and shall not be dirty or missing:
5.1.4: The indicating pointer shall not be tilted, and shall be flat during operation without stuck needles, hysteresis and other phenomena: The brightness of the light column shall be uniform and there shall be no segmentation phenomenon; the knobs, buttons and digital dials of the setting mechanism shall be flexible to operate; 5.1.5: The meter that inputs artificial thermoelectric signaling and has a control function, It should have the function of disconnection protection. 3.2 Insulation resistance
Under the condition of ambient temperature of 15℃～35℃ and relative humidity of 45%～75%, the insulation resistance of the power supply, input, output and grounding terminals (or shell) of the instrument in the opposite direction (except that the input terminal and the output terminal are not isolated) shall not be less than 20M2:
5.3 Insulation pressure
Under the condition of ambient temperature of 15℃～35℃ and relative humidity of 45%-75%, the power supply, input, output and grounding terminals (or shell) of the instrument in the opposite direction (except that the input terminal and the output terminal are not isolated) shall be applied with the test voltage specified in Table 1, and the voltage shall be maintained for 1min without any breakdown or arcing. Table 1
Only nominal voltage of terminal 'V
130<25D
Test area
Counter instrument county Control
JJC951-2000
Measuring instrument control includes periodic calibration, post-calibration and in-production pressure inspection: 6 1.1 Calibration conditions
6.1.1 Calibration equipment
Standard instruments and matching equipment required for calibration are shown in Table 2. The selected standard instruments, including the calibration equipment, shall not exceed the probability of change of the estimated value. 15 meters 2 of the most human-friendly meter error detection
Proposed band section names
Er standard flow generation
Star must be true flow low medium installation
Differential meter
Ring DC
Said generator
Internal source fading generator
Lu flow ugly box
Compensation cable guide door
Paper device (freezing point)
Three meters connected Connecting wire
Dunke Shangqi multi-comparator
Test analyzer
White dynamic position meter
(Changyi:
According to the technique, the person should come
1/5 of the excess position difference
2. The wax output resistance of the standard pressure-stopping generator
anti-standard is less than 5α
1. Can output continuously (U80)
2. Road The concave protection small "52
small ten is filled with 15
of the meter. The wire should have a 20 seven-line repair limit value
. The three-line connection conductor pressure can exceed
only 1/11 of the table tolerance
P value measurement range: 0.005-0.995
difference: ±
small group small day ten U.1 s
measurement range: (U.10mV
time heat out of the meter and
, the electric inquiry type
position fixed point has a reference
normal benefit total mouth or compensation
night loss time, the industry
protocol meter calibration institute standard
sub-development uncertainty product
includes compensation number correction
and the above types are included
2. DC low potential rate;
position design is not used as a source
distribute heat and electricity
strict type quarantine calibration
open the ocean
dynamic compensation instrument calibration use
reverse connection
Bright observation timing
to transmit the position to the level of the car
(0 -5) 0 Select
Set time ratio conversion
Smith systembzxz.net
The meter's positive point recognition,
level European response, specification related month
Not pregnant can be combined.3
DC (0-70mV
Difficult to determine the level: 0.5 level
Paper feed rate: less than 20mm/min
Hebei structure center flow recording
Record level blowing river load
Level knowledge to be measured most standard repurchase
White Institute ammeter
Only the name of the equipment
Insulation in
Discussion voltage test
AC stable source
Environmental conditions
JJG 951—2000
Capsule 2 (wire)
Technical requirements
Output voltage: 500V, 10Hz
Output voltage: AC (0~1S00)V
Frequency: (45-55)Hz
Output power: not less than 0.25kw
Output voltage: AC 225V
Output power: not less than 0.5kw
Heart pressure stability: 1%
Ambient temperature: (20+5):
Relative humidity: 45%--75%:
Verification resistance
Verification plate
Instrument power supply||tt ||Power supply of the meter: Voltage change does not exceed ±1% of the rated value: Frequency change does not exceed ±1% of the rated value: In addition to the geomagnetic field, the external magnetic field that the shadowless meter is calibrated with: 6.2 Calibration items
The calibration items for each control management stage are shown in Table 3. Table 3
Calibration items Date
Basic error
Standard error
Position control meter
Set point error
Switching difference
Time proportion control meter
Set point
Proportional band
Continuous and intermittent PID control meter
First calibration
Subsequent calibration
In-use inspection
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