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GB/T 21117-2007Magnetostrictive liquid level meter (English PDF)

磁致伸缩液位计

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

October 11, 2007

Implementation date

December 1, 2007

Scope

GB/T 21117-2007 is the English-translated version of 磁致伸缩液位计.

GB/T 21117-2007 is the Chinese standard "Magnetostrictive liquid level meter". Its scope clause reads: This Standard specifies the magnetostrictive level meter - product classification, basic parameters, technical requirements, test methods, inspection rules, signs, instructions, packaging, storage and transport.

This Standard applies to the magnetostrictive (known as levelmeter for short hereafter). Its clauses include terms and definitions; product classification; basic parameters; technical requirements; test methods; test rules; signs and instructions; package, storage and transport.

It was issued by the State General Administration of the People's Republic of China for Quality Supervision and Inspection and Quar on OCTOBER 11, 2007 and took effect on DECEMBER 1, 2007.

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Document preview — GB/T 21117-2007

National Standard of the People's Republic of China

ICS: 17.040.30
Classification: N 12

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope4
2 Normative references4
3 Terms and Definitions5
4 Product Classification6
5 Basic Parameters6
6 Technical Requirements7
7 Test Methods12
8 Test Rules17
9 Signs and Instructions19
10 Package, Storage and Transport19
References and Original Chinese Documents21

Foreword

This Standard is based on the current technical conditions and the development directions of domestic and foreign magnetostrictive level meter, and it has taken full consideration of the needs of the domestic market. The level meter has the characteristics of high precision - It not only belongs to a common sensor, but also be used as measuring instrument. Therefore, during preparation of this Standard, the effort has been made to consider above two aplication aspects, comply and consistent with JJG 971-2002 "level meter test procedures."

1 Scope

This Standard specifies the magnetostrictive level meter - product classification, basic parameters, technical requirements, test methods, inspection rules, signs, instructions, packaging, storage and transport.

This Standard applies to the magnetostrictive (known as levelmeter for short hereafter).

2 Normative references

The following normative documents contain provisions which, through reference in the text, constitute provisions of this Standard. For dated reference, subsequent amendments or revisions (excluding contents of corrigenda) do not apply. However, parties who enter into agreement based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition of the normative document referred to applies.

GB 3836.1 Electrical apparatus for explosive gas atmospheres Part 1: General requirements (GB 3836.1 - 2000, eqv IEC 60079-0. 1998)

GB 3836.2 Electrical apparatus for explosive gas atmospheres Part 2: Flameproof enclosure "D"(GB 3836.2 - 2000, eqv IEC 60079-1. 1990)

GB 3836.4 Electrical apparatus for explosive gas atmospheres Part4. Intrinsic safety "I" (GB 4208 Degrees of protection provided by enclosure) (IP Code KGB 4208 - 1993, eqv IEC 60529. 1989)

GB 9969.1 General principles for preparation of instructions for use of industrial products

GB/T 15464 Instrumentation packaging technology

GB/T 15479-1995 Industrial automation instrumentation insulation resistance, dielectric strength technical requirements and test methods

GB/T 17626.2 - 1998 Electromagnetic Compatibility Testing and measurement techniques - electrostatic discharge immunity test(idt IEC 61000-4-2.

1995)

GB/T 17626.3 - 1998 Electromagnetic Compatibility Testing and measurement techniques RFEMS test(idt IEC 61000-4-3:1995)

GB/T 17626.4 - 1998 Electromagnetic Compatibility Testing and measurement techniques - electrical fast transient burst immunity test(idt IEC 61000-4-4:1995)

GB/T 17626.5 - 1999 Electromagnetic Compatibility Testing and measurement techniques surge (impact) immunity test (idt IEC 61000-4-5. 1995)

GB/T 17626.6 - 1998 Electromagnetic Compatibility Testing and measurement techniques conducted disturbances induced RF field immunity test (idt IEC 61000-4-6:1996)

GB/T 17626.8 - 1998 Electromagnetic compatibility test and measurement techniques - Power frequency magnetic field immunity test (idt IEC 61000-4-8. 1993)

GB/T 18268 - 2000 Electrical equipment EMC requirements for measurement, control and laboratory use (idt IEC 61326-1:1997, Amd. 1. 1998)

GB/T 18271.1-2000 Process measurement and control devices - general methods and procedures for evaluating performance Part 1: General Principles (idt IEC 61298-1. 1995)

GB/T 18271.3-2000 Process measurement and control devices - general methods and procedures for evaluating performance Part 3: Tests for the effects of influence quantities (idt IEC 61298-3. 1998)

GB/T 18271.4-2000 Process measurement and control devices - general methods and procedures for evaluating performancePart 4. Evaluation report content (idt IEC 61298-4. 1995)

JB/T 9329-1999 Instrumentation transport, transportation storage and basic environmental conditions and test methods

3 Terms and Definitions

The following terms and definitions apply to this Standard.

3.1 Magnetostriction The phenomenon - Changing the magnetization direction of the ferromagnetic material will cause a change in the lattice spacing of the medium, so that the ferromagnetic length and volume change.

3.2 Magnetostrictive Liquid Level Meter

A device for measuring the liquid interface or liquid-liquid interface positioning, of which the internal sensing elements are designed and manufactured based on magnetostrictive principles.

4 Product Classification

4.1 Classified by the level structure of the measurement rod

a) Rigid rod - Overall structure of the measuring rod is rigid, and it has a certain amount of support to ensure its linear state.

b) Flexible rod - Measuring rod can be bent during transport and installation process. Hammer, magnet steel and lifting hook shall be adopted to ensure it at straight state when used and in operation.

4.2 Classified by the type of level meter measurement parameters

a) Liquid level measurement - only MEASURE a location parameter of liquid level;

b) Interface measurement - simultaneously MEASURE multiple locations of liquid level and interface parameters.

4.3 Classified by the form of the output signal level meter

a) Analog output type - include. current output type and voltage output type;

b) Digital communications type;

c) Composite output type - it contains more than two functions, such as. HART protocol.

4.4 Classified by the safety performance of level meter

- Ordinary type;

- Explosion-proof type (mainly. flame-proof, intrinsic safety, and others).

5 Basic Parameters

5.1 Measurement Range

Rigid rod. <=6 m; Flexible rod. 3.5 m~20 m.

The upper-blind area of level measurement. <=100 mm, the lower-blind area. <=60 mm. The lower-blind area of interface measurement. <=15 mm.

5.2 The Output Signal

a) Analog output type.

1) current output type. 4mA(d.c)~20 mA(d.c), load resistance range. 0 ohm~ 750 ohm.

2) voltage output type. 0V(d.c)~5 V(d.c), 1 V(d.c)~5 V(d.c) or 0 V(d.c)~

7 Test Methods

7.4.8 Electromagnetic Compatibility Test

- According to the provisions of Chapter 5 of GB/T 18268-2000 in Chapter 5, DEVELOP electromagnetic compatibility testing program - According to the provisions of GB/T 17626.2 - 1998, electrostatic discharge immunity test shall be conducted;

- According to the provisions of GB/T 17626.3 - 1998, RFEMS test shall be conducted;

- According to the provisions of GB/T 17626.4 - 1998, electrical fast transient burst immunity test shall be conducted;

- According to the provisions of GB/T 17626.5 - 1999, surge (shock) immunity test shall be conducted;

- According to the provisions of GB/T 17626.6 - 1998, conducted disturbances induced by RF field immunity test shall be conducted;

- According to the provisions of GB/T 17626.8 - 1998, power frequency magnetic field immunity test shall be conducted;

- According to the provisions of 6.5 in GB/T 18268 - 2000, the test results shall be assessed. According to the provisions of Chapter 8 of GB/T 18268 - 2000, test reports shall be written.

7.5 Other Tests

7.5.1 Insulation Resistance Test

Test shall be conducted according to the provisions of 5.3 in GB/T 15479 - 1995.

7.5.2 Working pressure test

Measure rod of level meter shall be installed on the pressure test equipment. Test pressure is 1.5 times the rated working pressure. CHECK the performance of level meter, LAST for 20 min.

7.5.3 Visual Inspection

Eye-sight observation and powered inspection.

7.5.4 Explosion-proof Performance Test

- - Flame-proof level meter shall be tested according to the provisions of GB 3836.1 and GB 3836.2;

- - Intrinsic safety level meter shall be tested according to the provisions of GB 3836.1 and GB 3836.4.

7.5.5 Protection Performance Test

Test shall be conducted according to the provisions of GB 4208.

7.5.6 Anti-transportation Environment Performance Test

In the case of level meter is packaged - transportation, transport storage and basic environmental conditions shall be tested according to the following sequence.

a) Hypothermia test is conducted according to the provisions of 4.2 in JB/T9329 - 1999. […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 21 pages — is available in the English PDF.

Referenced standards

Normative references

GB 3836.1 · GB 3836.2 · GB 3836.4 · GB 9969.1 · GB/T 15464 · GB/T 18268

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