GB/T 21117-2007 PDF English
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GB/T 21117-2007: Magnetostrictive liquid level meter---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT21117-2007
ICS 17.040.30
N 12
National Standard
of the People’s Republic of China
GB/T 21117—2007
Magnetostrictive liquid level meter
磁致伸缩液位计
Issued on: OCTOBER 11, 2007
Implemented on: DECEMBER 1, 2007
__
Issued by. State General Administration of the People's Republic of
China for Quality Supervision and Inspection and
Quarantine;
China National Standardization Management Committee
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and Definitions ... 5
4 Product Classification ... 6
5 Basic Parameters ... 6
6 Technical Requirements ... 7
7 Test Methods ... 12
8 Test Rules ... 17
9 Signs and Instructions ... 19
10 Package, Storage and Transport ... 19
References and Original Chinese Documents ... 21
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."
Magnetostrictive liquid level meter
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 Ω〜
750Ω.
2) voltage output type. 0V(d.c)〜5 V(d.c), 1 V(d.c)〜5 V(d.c) or 0 V(d.c)〜
7.4.8 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.
For those level meters which temperature of working environment is less than -40°...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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