GB/T 11828.1-2002 Water level measuring instruments Part 1: Float type water level gauge
Some standard content:
ICS07.060
National Standard of the People's Republic of China
GB/T11828. 1—2002
Replaces GB/T 11828—t989, GB/E 11830—1989 Water Level Measuring Instruments
Part 1: Float-type water level gauges
Instruments for stage measurement-Part 1:Float-type stage gauge2002-09-09 Issued
People's Republic of China
General Administration of Quality Supervision, Inspection and Quarantine
2003-03-01 Implementation
GB/T11828.1—2002
GB/T11828 Water level gauge" is divided into 3 parts, Part 1: Float type water level gauge*
- Part 2: Pressure type water level gauge:
- Part 3: Groundwater level gauge;||t t||Part 4: Ultrasonic water level gauge;
Part 5: Electronic coded water gauge:
Part 6: Telemetered water level gauge;
Part 7: Ice level probe
This part is Part 1 of GB/T 11828, replacing the contents of GB/T 11828-1989 "Float-type water level gauge for open channel flow measurement" and GB/T 11830-1989 "Telemetered water level gauge for hydrological measuring and reporting devices" related to float-type water level gauges. Compared with GB/T31828-1989 and GB/T11830-1989, the main changes of this part are as follows: the definition of "floating water level gauge" and "water encoder" is added; the product classification is re-made; the display mode and recording mode are re-classified; the reliability requirements and the contents of the test part are specified; the operability of this part is more consistent with GB/T15966-1995 Basic parameters and general technical conditions of water and meteorological instruments and SI./T 224--1999 Water Level Meter General Technical Specifications This part is proposed by the Ministry of Water Resources of the People's Republic of China. This part is under the jurisdiction of the National Hydrological Standardization Technical Committee Hydrological Instruments Technical Committee. Drafting unit of this part: Nanjing Water Resources and Hydrological Dynamics Research Institute. The co-authors of this part: He Shengzhuang, Zhang Yucheng, Yao Shuixi, Mu Kang. The previous versions of the standards replaced by this part are: -G3/T11828-1989. GB/T11830-1989.1 Scope
Water level measuring instruments
Part 1: Float-type water level gauge
G/T 11828. 1—2002
This part of GB/TI1828 specifies the product classification, technical requirements, test methods, inspection rules, packaging marking, transportation, storage and warranty period requirements of float-type water level gauges. This part applies to float-type water level gauges used in natural water bodies such as rivers, tidal channels, open channels, reservoirs, etc. (hereinafter referred to as "water level gauges"). 2 Normative references
The provisions of the following documents become the provisions of this part through the application of this part of GB/T11828. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to virtual agreements based on this part are encouraged to Study whether the latest version of this document can be used. For any undated referenced document, its latest version applies to this part. GB/T9359-2001 Basic environmental test conditions and methods for hydrological instruments GB/T1818 Technical requirements for reliability of hydrological instruments G8/T5009 Basic hydrological terminology and symbol standard GBJ138 Water level observation specification SL1 Hydrological instrument terminology 3 Terms and definitions GB/T0095 and SI.10 Confirmation room. The following terms and definitions apply to this part of GB/T11828. 3.1 Loat-type water level gauge stage gauge is a water level observation instrument that uses the water surface float and its corresponding device to sense the water level change and record or display the water level parameters. It generally includes a float type water level sensor and a display recorder. It can also include a water level encoder and a power supply. Its sensor can have an electrical output signal that can transmit the water level parameters to the observation site for recording or display, and the display recorder should have a timing function. 3.2
water level encoder
fwater level encoder
The water level encoder is a conversion device of the float type water level sensor. It completes the source encoding of the water level parameters and converts the water level or water level change into an electrical signal output.
4 Product classification
4.1 Classification by sensor output signal
a) Incremental encoding
According to the resolution requirement, a signal is sent every time a certain water level value is increased (or decreased). There are often ways such as permissible increment, three-state increment, and four-state increment:
b) Full-scale integrated code
Convert the water level value into a 0"1 digital. Within the range, there is a unique coded output for each scale value, generally including BCD code, Gray code, remainder code, geometric code, etc. CB/T 11828. 1--2002
e) Electrical analog type
Converts water level information into corresponding electrical output, such as potentiometer sensor, etc. 4.2 Classification by coding principle of water level encoder
Mechanical coding
Converts water level information into a set of mechanical contact on-off signals. b
Photoelectric coding type
Converts water level information into corresponding light quantity changes. Then uses photosensitive elements to convert it into a digital signal. Magnetoelectric coding type
Converts water level information into corresponding magnetic field changes, and then uses magnetic sensitive optical elements to convert it into a digital signal. Analog-to-digital coding Type
Convert water level information into analog quantity, and then use electronic devices to convert it into digital signal. Among the electronic coding types, there is a magnetoelectric coding type, which converts water level information into corresponding magnetic field changes, and then uses magnetic elements to convert it into digital signal. 4.3 Classification by recording method
Solid state storage record
Use case circuit storage to store and record data, which is not computer readable. Print record
Use a printer to record data.
Analog record
Use an analog recorder to record the process line. 5 Technical requirements
5. 1 Environmental requirements for use
5.1 Working environment temperature: 100°C and the water surface should not freeze. 5.1.2 Relative humidity of working environment: 20%~95% (40°C). 5.2 General requirements
5.2.1 The maximum water level should not exceed 1 cm. It is recommended to use 0.1 cm, 0.5 cm, and 1 cm. 5.2.2 The measuring range is 100~1200 m, which can be expanded to 0 m--400 m. 5.2.3 The maximum water level change rate that can be adapted should not be less than 40 rm/min. 5.2.4 The float diameter should not be greater than 250 mm. It is recommended to use 250 mm, 200 mm, 150 mm, and 120 mm. The diameter can be increased or reduced in special cases.
5.3 Accuracy
5.3.1 The accuracy level of the water level meter is divided into three levels. Table 1 shows the allowable error of each accuracy level when the measuring range is 0 m~10 m. The acceptable probability of the test result should be above 0.2% of the water level fluctuation range when the measuring range is expanded:
Allowable error limit
Accuracy level
Applicable resolution
0.1.0.5, 0.0
2.1, 0.5.1.0
Matching timing mechanism accuracy
Day: 7
Precision level
General level, precise level
General level, precise level
Month: 3H
Half a year, year
Precision level
5. 3.2 The sensitivity (also called interval value) of the water level meter should not exceed the requirements of Table 2. Table 2
Accuracy level
Sensitivity
5.3.3 The interval value should be less than the allowable error limit of the water level meter. Level 1
5.3.4 The repeatability error value should be less than 0.5 times the allowable error of the water level meter. 5.3.5 Timing error and time standard
The water level data should be recorded with the corresponding time. Based on the Beijing time, the allowable error is shown in Table 3. Table 3
Recording period
5.4 Mechanical structure requirements
Precision grade
±4/30
112/180
±15/350
Ordinary grade
imin/d
±10/7
±12/15
GB/T 11828.1—2002
Grade 2 Grade 3
Duration of time
5.4.1 The suspension cable shall be made of corrosion-resistant (or treated with corrosion resistance) and low linear expansion coefficient and light-weight materials. This standard recommends the use of chain-driven perforated belts or beaded steel cables, the cross-sectional area of which shall not be greater than 0.2 mm×10 mm or the diameter shall not be greater than 2 mm. 5.4.2 Requirements for water tightness of floats; hollow floats should be guaranteed to be watertight, and solid floats should be made of non-absorbent materials. 5.4.3 The structure of the water level gauge should meet the protection requirements of humid environments. The first part should be made of anti-corrosion materials. When other materials are used, the surface should be treated with anti-rust.
5.4.4 The structure of the water level gauge should be easy to install, adjust, use and maintain. 5.5 Output interface
5. 5. 1 Incremental type
5. 5.1.1 The sensor sends distance signals according to the resolved variables as the water level changes. The signals can be contact on-off or flat output.
5. 5.1.2 The signal format of the incremental type is recommended in the following four ways: 2
Avoidable counting type
The sensor gives two groups of signals, one for incremental signals and the other for fluctuation status signals, generally for three signal lines. The counter can output BCI code:
Three-state incremental
sensor gives three groups of zero pulses, and distinguishes the water level fluctuation according to the sequence of three groups of signal states. There are 4 signal lines, and a ternary cyclic counting circuit 3*nd stepper motor is used to perform recording operation, which can also be converted into BCI> code output. Four-state incremental
sensor has only: two groups of switch signals, which can form four states of 00, 01.11, and 10. There are two signal lines, which need to be converted into BCD) code output through a more complex logic circuit of GB/T 11828. 1-2002
.) Time floating pulse type
sensor outputs two groups of pulses, and the increase or decrease is determined according to the timing of its input pulse, which is generally a three-wire or five-wire input. 5. 5. 2 Full-quantity encoding type
Converts real-time water level data into binary terminal code. The coding can be full range, or low-bit coding, and high-bit computer calculation. The coding input can be parallel output or serial output. The recommended code system for parallel output is CD code, Gray code, and three-way reflection. Similarly, its signal can be contact on and off, or level input. 5.5.3 Electrical analog type
Any analog signal such as voltage, voltage, resistance, capacitance, and current that is a function of the water level can be converted into a real-time correct water level value in the water level meter and output in BCD code. 5.6 Interface matching requirements
5.6.1 Contact on-off output
The on state is 1, the contact voltage should not be greater than 0.52, the off state is 0, the insulation resistance should not be less than 10Mn, the maximum voltage should not be less than 24V, in special cases it should not be less than 30V, the current should not be less than 10mA, 5.6.2 Level output
The high level is 1. The output current is 0.0!mA, the low level is the state, the absorption current is not more than 0.3m4, the high and low level values are preferred to CMGS level and TTI level, 5.6.3 Cable transmission
The transmission cable has good anti-interference performance. The length of the transmission cable should ensure that its DC impedance (or resistance value) is not more than 100, and the insulation resistance is greater than 10M2.
.5.6.4 Interface requirements
The sensor interface can be isolated or low impedance, and its interface impedance should not be greater than 100Ω. If there is a resistive device in the connected circuit, measures should be taken to eliminate the high and low currents caused by the reactance. 5.6.5 Output connector requirements
It should adopt a waterproof and moisture-proof structure, and the insulation resistance between lines should be greater than 10Mn. 5.7 Recording and display
The mechanical motion or electrical signal representing the water level output by the sensor is measured, recorded and displayed. The minimum unit of water level measurement, recording or display should be equal to 1 resolution, and the corresponding time should be recorded when recording the water level. 5.7.1 Display mode
) Mechanical digital display
Such as counter digital wheel display, pointer display. b) Electronic digital display
Commonly used are crystal display, light-emitting tube display, etc. 5.7.2 Recording method a) Graphic recording The two coordinates in the coordinate system represent time and water level respectively. The process simulation record is carried out. The record line width is 0.2 mm to 5 mm. The printing record is generally selected with an interval of 6 tnn, 12 min. 30 min, 1 h, 2 l, 3 l, 6 h, 12 h. ) State storage record is generally available in RAM, FIash, FPROM, EEPROM and other recording methods. Any method carries time stamp information. 5. 8 Power supply and lightning protection 5. 8.1 Power supply DC power supply is adopted. The power supply bottom adopts 6V. 12 and 24GB/T 11828.1-2002. The allowable deviation is -10% and +15%. The whole machine on-duty current (i.e. clock and on-duty circuit) should generally be less than 1mA: except for printing and display, its operating current should be less than 0.1A. 5.8.2 Lightning protection requirements
a) Instruments and circuits can be installed by floating or reliably grounding, and the shielding layer of the transmission line should be reliably in contact with the earth: 6) Signal transmission cables should generally be installed by passing through gold screen pipes and burying them. In areas with more lightning, signal interface isolation measures can be adopted:
c) The shielding needle should be installed according to the requirements of the communication department. 5.9 Other requirements
5.9.1 The water level reading is based on the base surface specified in GB138. In the middle and upper reaches or mountainous areas, because the ground elevation is high, the "zero point elevation reading" function should be set when necessary
5.9.2 Well logging cannot completely eliminate wave noise. In order to make the output data stable: the instrument should adopt certain filtering measures. 5.10 Reliability requirements
The water level meter is a repairable product. Its reliability characteristic is usually expressed by the mean trouble-free working time MBF. 5.10.1 Under the condition of normal maintenance of the instrument, the mean trouble-free working time of the water level meter should be greater than 8000F. 5.10.2 The mean trouble-free working times of the water level meter using the contact encoding device should not be less than 5×10 times. Generally, the level change is 1cm, and one encoding is completed as one measurement. The mean trouble-free working times of the water level meter using the non-contact encoding device should be more than 5×10 times.
5.10.3 Data error rate
The allowable error rate of the whole machine in continuous indoor operation should be less than 1×10-5 autumn. 6 Test method
6. 1 Test conditions
6.1.1 The test should generally be carried out under the following indoor environmental conditions: a) Temperature 1030C
b) Humidity 40mA ~ 75%RH.
6.1.2 The test equipment shall be qualified after appraisal. The accuracy of the special water level test bench shall be higher than the accuracy requirement of the water level meter being tested. The error shall not be greater than 0.3 of the allowable error limit of the water level meter being tested. Only then can it be used as the agreed true value, otherwise it shall be corrected. 6.1.3 The water level meter being tested shall not be adjusted during the test. The test results are allowed to have reasonable linear translation during data processing. 6.2 Main test equipment
For water level test bench:
h) Encoder tester:
High temperature test chamber:
d) Low temperature test chamber:
High temperature and high humidity test chamber;
f)) Clock tester;
) Electrical parameter test instruments Multimeter, dual-trace synchronous oscilloscope, insulation and electric density tester, special decoder. 6.3 Test method
The specific test method is shown in Table 4.
GB/T 11828. 1---2002
Standard clauses
Test content
Environmental conditions
Resolution
Observation range
Water level change rate
Basic error
Sensitivity
Complex error
t) Working temperature
Test method
Test temperature:
-50, the water surface is not frozen.
Test method: Test according to the provisions of Chapter 6 of (3/T9359-2001). After the test, the signal conversion part and the display and recording part of the position meter sensor should work normally. b
Working temperature
Relative accuracy:20%～95% at 40°C.
Test method: Test in accordance with the provisions of Chapter 1 of GB/F 9359-2001. After the test, the signal conversion, recording, display and other functions of the water level gauge should be normal, and the surface should be free of corrosion, cracking, peeling and other damage.
) Default storage temperature
Test temperature: EO.
Test method: Test in accordance with the provisions of Chapter 6 of GB/T 9359-200. After the test, check that the functions of all parts of the water level gauge should be normal. 2) Storage humidity
Relative humidity: 90% at 40°C
Test method: Test in accordance with the provisions of Chapter 7 of GB/T 9359--2001. After the test, check that the functions of all parts of the water level gauge should be normal, and the surface should be free of rust, cracking, puncture and other damage.
Equipment used: Water level test bench (hereinafter referred to as "water level test bench"). In the water level meter's base range, the water level is raised and lowered at different water level change rates of 20 cm/min--40 cm/min. The number of measuring points per meter is not less than 1-2, and the number of full-scale measuring points is not less than 15. The static observation results should comply with 5.2.1, 5.3.1 Requirements. For water level gauges with a rate of change of more than 40m/min, use a speed reducer tester to conduct a tidal test. When the speed reaches the maximum allowable speed of the level gauge, the instrument does not sense errors or measurement errors:
Recovery equipment: water level table.
Within the measuring range of the water level gauge, make the water level rise or fall to a certain value. When the water level and the water level gauge are in a steady state, continue to change the water level in the same direction. When the sensing component of the water level gauge is clearly actuated, record the water level change. This test is carried out at three to five different water points. , should meet the requirements. The water level change should not be greater than the sensitivity threshold. Equipment used: water level table.
Within the range of the water level meter, the water level is lowered to the same water level. The difference between the two records or indications is the test error. However, this test should be carried out at different water levels for 3-5 times, and the average value should be within the allowable value range of the water level meter. Equipment used: water level table.
The water level meter is raised or lowered to the same water level value 5-10 times, and the difference between the maximum and minimum measured values is taken. This test should be carried out at 3-5 The test result is the repeatability error of the water level meter. It shall not exceed 0.5 arm of the allowable error limit of the water level meter.
Standard clause
Test content
Timing error
Mechanical structure
Float water resistance
Yoke outlet test
Recording and display function test
Reliability test
Free fall test
Case 4 (continued)
Equipment used: clock tester
Test method
GB/T 11828. 1—2002
and) The timing device can generally run for 1 to 2 cycles under the temperature conditions of the chapter. The long-term recording instrument can be compressed to 1 to 2 months. It should meet the requirements specified in Table 3. h) The water level meter recorded in a fixed period of time shall run for at least 24 hours under the conditions selected in the period of time. h. The recording interval time should meet the requirements and should not be missed. The scanning inspection should meet the requirements of 5.4.1, 5.4.3, and 5.4.4. The penetration should be fully immersed in 6G C hot water. No bubbles should appear within 1 minute. Use equipment: electrical parameter testing instruments, including multimeter, dual-trace synchronous liquid indicator, insulation resistance tester, and special encoder.
a) Contact resistance and insulation resistance
are measured with digital multimeter and resistance tester, which should meet the requirements of 5.5.1. h) Level test
can be measured with digital multimeter. The state of each output terminal line should meet the requirements of 5.5.2. Short shape test
with dual-trace step indicator, manually turn the water level wheel to send out a signal, observe its waveform, which should meet the relevant requirements in 5.5.
d) Determination of the code
Use a special decoder to determine the code, and connect the load in series to determine its transmission load capacity.
Connector dampness test
In a high temperature and high mixing box, determine the insulation of the outlet wire + should meet the requirements of 5.6.6, visually observe the display, and the displayed value should be clear and correct. b
Record test
It needs to run indoors for 1-2 record periods. Long-term records (more than one month) can be compressed and carried out after one (referring to batch production). The test is given 105-- 2 The new input data shall be regarded as known data and recorded automatically at different time intervals. Under the conditions of timing duration and other requirements, the data shall be correct and the function shall be normal. For the recording device of process simulation recording, the record line width shall also be checked and shall meet the requirements of 5.7.2). c) Patient storage records
shall be recorded continuously according to the above method and then displayed and printed on the computer. They shall correspond to the input known data one by one without error.
) Carry out on the encoder tester, run the encoder at a medium speed, and test 2.5.20 and 5 (ten thousand times) according to 5.10.2, and meet the requirements of 5.10.3. L) Trouble-free working time (MTBF) test
The test products shall be no less than 3 sets, and the test time shall be no less than six months. The number of faults () shall be calculated according to the provisions of GB/T 28185, and shall meet the requirements of 5.10.1. The water level meter is packaged at a height selected according to Table 5, and falls on a smooth, hard concrete or steel surface by a falling body, the number of times is times. After the test, the packaging box should not be deformed or cracked. The water level meter is unpacked and inspected. There should be no deformation, looseness or binding. All parts are functional. GB/T 11828. 1---2002
7 Inspection rules
7.1 Factory inspection
7.1.1 Products produced by batch supervision should be inspected for factory inspection one by one. 7.1.2 Factory inspection shall be carried out by the manufacturing quality inspection department according to the provisions of 5.2.1 ~5, 2, 3, 5.3.1, 5, 3.5, 5, 4 and 5.7. 7.1.3 After each water level meter passes the inspection, a product inspection certificate shall be issued before it can leave the factory. 7.2 Type inspection
7.2.1 When the water level gauge has the following conditions, a type inspection should be carried out: a) Trial type identification of new products or old products transferred to the factory for production; h) After formal production, if there are major changes in structure, materials, and processes that may affect product performance, a periodic inspection should be carried out during formal production, regularly or after a certain period of accumulation; d) When the product is resumed after a long period of suspension; when the factory inspection results are significantly different from the first type inspection; f) When the national quality supervision agency proposes a type inspection requirement. 7.2.2 Type inspection is completed by the quality inspection department of the manufacturer to conduct a full performance inspection according to all the test items specified in this standard (except reliability test).
7.2.3 Samples for type inspection should be randomly selected from 5 products that have passed the factory inspection. If the total number of products is less than 5, all of them should be inspected.
.2.4 The derivability test is not a type inspection item. It can be carried out through special tests. 7.2.5 Test conclusion evaluation bzxz.net
If more than two (including two) units fail in the type inspection, the batch of products is judged to be unqualified. If one unit fails, the product should be doubled for sampling and inspection. If there are still unqualified units, the batch of products is considered unqualified. If all are qualified, the batch of products should be judged to be qualified except for the first batch of unqualified products. For this batch of unqualified products, the reasons should be analyzed and measures should be taken. The products should be returned to the repair shop for a second type inspection. If they are qualified, the batch of products is confirmed to be qualified. If they are still unqualified, the batch of products is considered to be unqualified. 7.2.6 The water level gauge that has passed the type inspection needs to replace the easy-to-use parts and can only be shipped after passing the factory inspection. 8 Marking, packaging, transportation, storage
8.1 Marking
8.1.1 The water level meter should have a nameplate nailed to its top, indicating its model, name, manufacturer, detailed address and trademark, factory number and date, etc.
The contents of the outer packaging box should include:
Product name, model, number of pieces;
Box size (mm) length × height × width;
Box net weight or gross weight (kg);
Destination station (port) and collection unit;
e) Departure station (port) and delivery unit:
) Transportation operation safety mark.
8.2 Packaging
8.2.1 The packaging box should be economical, beautiful, compact and reliable. 8.2.2 The main body of the water level gauge and the float and weight should be packed in boxes or compartments, with cushioning measures to ensure that the parts in the box do not collide or rub against each other. 8.2.3
The packaging sheath should have moisture-proof, anti-deformation, anti-slip and other protective measures. When packing, the surrounding environment and the packaging box should be clean, dry, free of harmful gases and foreign matter. 8.2.4
8.2.5 The technical documents accompanying the water level meter include packing list, product certificate, instruction manual, etc. 8.2.6
GB/T 11828.1—2002
The packaged water level meter can withstand free fall during transportation, and the drop height should meet the requirements of Table 5. Table 5
Gross weight after packaging
59~100
8.3 Transportation
The packaged water level meter should be able to adapt to various modes of transportation. 8.4 Storage
The storage of the water level meter shall comply with the provisions of GB/T9359. Warranty period
Height from the ground
If the water level meter is damaged or cannot work normally due to poor manufacturing quality within one year from the date of leaving the factory, provided that the user complies with the rules of use, transportation and storage, the manufacturer shall be responsible for free repair or replacement.
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