JJG 947-1999 Verification Procedure for Acoustic Tide Gauges JJG947-1999 Standard download decompression password: www.bzxz.net
This procedure is applicable to the verification of newly manufactured, in-use and repaired acoustic tide gauges. It can also be used for the verification of acoustic water level meters.

National Metrology Verification Regulation of the People's Republic of China JJG9471999
Acoustic Tide Gauge
1999-10-18 Issued
2000-03-15 Implementation
State Administration of Quality and Technical Supervision Issued
Verification Regulation
of Acoustic ride Gaage
JJG947—1999
JJG947-1999
This regulation was approved by the State Quality and Technical Commission on January 18, 1999, and took effect on March 15, 2000.
Responsible unit: National Technical Committee for Geometric Length Metrology Drafting unit: National Geometry Metrology Station
This regulation is entrusted to the National Technical Committee for Geometric Length Metrology The committee is responsible for interpreting this regulation. The main drafter is: Li Mingzhi. JJG:947-1999 [National Marine Metrology Station] (National Marine Metrology Station) 2 Technical requirements 2.1 Appearance of instrument 2.2 Main technical standards of instrument 3 Verification conditions Verification equipment·Verification environment conditions.
4 Verification items
Appearance of instrument:
Indication error of gradual elevation
Earth level identification.
4.4 Timing indication error
5 Verification items
Appearance of instrument,
Indication error of gradual elevation
Earth level identification.
4.4 Timing indication error
5 Verification items
Appearance of instrument,
Indication error of gradual elevation
Earth level identification.
Timing indication error,
Discussion of measurement results
6 Verification Result processing and calibration cycle
6.1. Processing of calibration results
6.2. Calibration cycle
Appendix A
Tide height correction formula
Calibration record format
Front format of calibration certificate
Back format of calibration certificate-5
Front format of result notification
Back format of calibration result notification
J.IG 947—199
JJG 947—1999
Calibration procedure for acoustic tide gauges
Not applicable to new models, those in use and after repair, but can be used for the calibration of acoustic tide gauges.
1 Overview
The instrument (hereinafter referred to as the instrument) is mainly used to measure the tide (water level) of oceans, rivers and lakes: its principle is to use the method of distance measurement to measure the change of tide (water level), and it has the equipment of data storage, digital tube display, computer printing and recording, etc. The instrument consists of acoustic transmitter, measuring instrument and data transmission system. 2 Technical requirements
2.1 Apparatus appearance
21.1 The outer shell and the surface of the parts of the instrument shall be smooth and clean, without obvious marks, bumps, punctures, bubbles, etc. 21.2 Instrument name: The regulator should be able to adjust correctly, and the parts should be safe and reliable. 21.3 The instrument should be marked with the name and number, and the control system should be safe and reliable. , name, % mark production type and factory number technical indicators of the instrument technical indicators are listed in Table 1:
Non-production type
3 calibration cases
surface height measurement range
0~8:000
3.1 calibration equipment
3.1.1 measurement tower
bed diameter: 1m;
tidal height monitoring unit
water level change range: (0.-.5)m
water level change rate: (0~40mnmin
3.1.3 tidal standard device
measuring range: (0-)m
high error
timing difference
! 24 [within - not more than 3 R
within 124h not more than · 3k
accuracy: 2mm
3.1.3 Standard push timer
within 24h accuracy is 1.%
portable digital thermometer
temperature measurement range: (0.-40):
accuracy: ±.2t.
verification environment system
temperature: (5-35).
3.2.2 relative sensitivity: 85%,
JJG947
3.2.3 The vertical temperature of the sensor exposed to the water surface is 0.5℃. When the vertical difference is >0.5℃, the correction formula for the tidal height is corrected by static correction formula (see Appendix A). Verification items
appearance of the device
|Tide indication error
4.3 Tide identification
4.4 Timing system error
Verification method
Apparatus appearance
The appearance of the new instrument shall comply with the provisions of 2.1.1.-2.1.3 of this regulation. 5.2: Tide indication error
5.2.1 Tide height indication error verification points are: 0n, 2, 4m, 6m, 8 (±10?5.2.2 Procedure
5.2.21 After the installation of the instrument to be tested is completed, adjust the water level in the hose to make it The minimum value of the instrument is consistent with the standard instrument display.
5,2.2.2 Open the water inlet and water inlet system, and increase the water level at the rate listed in Table 2. Table 2
Instrument type
Water level rate
(mu/mir)
Consultation type
Non-sound level meter
When it rises to 2m, close the water inlet recorder and water inlet meter, and stabilize for 2min. First read the water level value displayed on the standard instrument and then read the water level value of the test instrument (the interval between the effects is 1min, and repeat the reading 3 times, 5.2.2.3 First calibrate the water level at the m shell, raise the water level to 8.1m, then open the drain, and when it drops to 8m, close the drain, first read the water level displayed by the standard instrument, and then take the water level value displayed by the instrument being tested (the reading can be random, re-read 3 times, read to 1m) and record it. Continue to descend, and determine the water level calibration points according to the sample method until the calibration of the local point of the gate. 5.3 Tide height identification 5.3.1 Tide height identification can be retreated at the same time as 5.2.2.3. The calibration points are 6m, 4m, 2 (11mm). 5.3.2 Accurately determine the calibration points: When the standard water level signal is stable and the indication of the inspection instrument is stable, lower the water level in the water tower and check for 1 hour. The indication of the inspection instrument changes. 5.4 Adjust the timing device of the drop inspection instrument to the standard timer. The timing error within 21h shall not exceed +3. 5. The test results are as follows: a. Calculate the difference (water level) according to the following steps: b. -he-hn
In the formula: the first measured value of the tested instrument is set to the error, mTm; the first measured value of the tested instrument is set to the measurement error, I:
the standard value of the measured value of the tested instrument is set to the error rate, mm: the total number of measured values:
the minimum error of the tested instrument correction piece, ntm; V is the value filled with liquid in the United States, 5! The following formula is used to calculate each time indication;
Formula T:
the measured value of the tested instrument is 8:
N standard timer value, ||t t||2-1: The error of the timing value of the instrument under test, 5: The calculation result is shown in the table "in the table and the US military request, 6. The treatment of the test results and the test period
6.! The treatment of the test results
JJG947
The test results of the instrument that meets the requirements of the vehicle regulations shall be issued with a test certificate; the test results notice shall be issued for the instrument that does not meet the requirements of this regulation.
6.2 Test periodwww.bzxz.net
The test period of the acoustic tide gauge (water level gauge) is 2 years4
Appendix A
Wu Zhong: A
JJG 947—1999
Tide height correction formula
1.9 × 10-$(T2 -- T,)
AH=(LH.D)
261 + 1.9 x 10-3T?
Height correction value caused by vertical overflow, T:
The measured height of the instrument under test, m; H
--calibration number, rm;
The air temperature near the acoustic transducer, T,--the air temperature at the water surface; L--is the vertical distance from the acoustic transducer to the water, cm. When -m, it is the correct height of the acoustic tide gauge; when L: 10cm, 4H is the height correction value of the non-tube acoustic tide gauge s
JJG947—19
Attached with the maximum ℃
Inspection unit
Apparatus name
Model specification
Factory number
Manufacturer
Verification conclusion
JJG947
Verification certificate front format
[Verification unit name]
Verification certificate
Verification period
Valid until
Appendix D
JJE: 947—1999
Verification certificate back format
Verification result
Instrument discrimination width
Average indication error of tidal height
Indication error of tidal height
4Indication error of timer
Note: Please bring this certificate with you for the next verification
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