GB/T 30434-2013General specifications for resistance vacuum gauge (English PDF)

3.1 Gauge vacuumgauge

Measuring less than atmospheric pressure gas or steam pressure instruments.

NOTE. Some commonly used gauge without actually measuring the pressure (which are terms of the force acting on the surface expressed), but measured in a predetermined condition

Some other stress-related physical quantities.

[GB/T 3163-2007, the definition 4.1.2]

3.2 Regulatory gaugehead

Regulation head

Resistance vacuum meter, comprising a pressure-sensitive element and is directly connected to a vacuum system components.

[GB/T 3163-2007, the definition 4.1.2.1]

3.3 Gauge control unit

Resistance vacuum gauge, a function that contains the required components and power measurement, control and output.

[GB/T 3163-2007, the definition 4.1.2.2]

3.4 Vacuum gauge indicating unit

Resistance vacuum gauge, the display means of the output signal in units of pressure.

[GB/T 3163-2007, defined 4.1.2.21]

4.1 Ambient temperature

0 °C ~ 40 °C.

4.2 Relative humidity

not more than 85%.

4.3 Power Supply

AC rated voltage of 220V, to allow deviation from the nominal value in the range of ± 10% (using AC power module allows

Pressure within the range of 85V ~ 265V work); Rated frequency. 50Hz, allow excursions range is ± 2%.

4.4

around without a strong vibration, dust, corrosive gases and strong electromagnetic interference.

5.1 Appearance

5.1.1

The regulation of the housing should be free of cracks, rust or apparent gas lines, bubbles and other defects.

5.1.2

The vacuum gauge switches, buttons, lights, plugs (seat), fuses, cables and accessories should be complete and intact.

5.1.3

Vacuum gauge All fasteners should be solid and should not fall off.

5.1.4

gauge chassis surface should be smooth, clean, no coating peeling, corrosion and other phenomena.

5.2-regulation

5.2.1 resistance value

5.2.1.1

When the regulation of cold resistance heater resistor value 10ohm ~ 50ohm, the resistance value shall not exceed ± 5% of the value of the regulatory design requirements.

5.2.1.2

When the regulation of cold resistance heater resistor value 51ohm ~ 100ohm, the resistance value should not exceed the regulatory requirements of the design value

Of ± 1.5%.

5.2.2 connection with the regulation of the vacuum system

5.2.2.1

When the connecting portion is regulated circular duct, the outer diameter of the pipe should be 15.5mm ± 0.5mm.

5.2.2.2

When the connection part is clamped regulatory vacuum quick release flange shall comply with GB/T 4982-2003 requirements.

5.2.3 tightness

The regulation of the helium leak rate should not exceed 10-8Pa · m3/s.

5.2.4 Insulation resistance

Insulation resistance and the regulation of lead metal should be not less than 10Mohm.

5.3 overall performance

5.3.1 indication range

It indicates the range of 1.0 × 10-1Pa ~ 1.0 × 105Pa.

5.3.2 The relative error in the measurement range

5.3.2.1

measurement range is 5.0 × 10-1Pa ~ 3.0 × 103Pa.

5.3.2.2

Measuring range indication in the relative error should not exceed ± 50%.

5.3.3 Stability

5.3.3.1

good start formal adjustment, fractions of 1h drift should not exceed ± 10% lower measuring range limit.

5.3.3.2

formal adjustment to begin full-scale drift within 1h should not exceed ± 25% range indicated on the limit.

5.3.4 Power supply voltage influence quantity

5.3.4.1

When the power supply voltage variation is within the range of 220V ± 22V, zero drift does not exceed the lower limit of the measuring range ± 5%.

5.3.4.2

When the power supply voltage variation is within the range of 220V ± 22V, full-scale drift amount does not exceed the upper limit of the indicative range ± 5%.

5.3.5 Safety Performance

5.3.5.1

When using a predetermined value of the dielectric strength test voltage, vacuum gauge should not be repeated breakdown or flashover (corona effects and similar

Phenomenon is negligible).

5.3.5.2

gauge power supply terminal and the insulation resistance between the shell and the chassis, the power switch is closed in the case of not less than 10Mohm.

5.3.6 Analog output signal

When there is a vacuum gauge analog output signal, shall meet the following requirements.

a) gauge analog DC current signal range should be consistent with GB/T 3369.1-2008 requirements of;

b) vacuum gauge analog DC voltage signal range should be consistent with GB/T 3369.2-2008 requirements of.

5.3.7 switch output interfaces and communication interfaces

5.3.7.1

When there is a vacuum gauge switch output interfaces, shall meet the following requirements.

a) shall specify the electrical performance of the interface, such as active or passive contact output, contact power parameters;

b) should indicate the number and function of each wire interface.

5.3.7.2

When there is a vacuum gauge communication interfaces, shall meet the following requirements.

a) vacuum gauge digital communication interface, should be given priority RS232, RS485 and RS422 interfaces;

b) using the 25-pin and RS232C/RS485 interfaces meet the GB/T 6107-2000 requirements;

c) a 9-pin RS232C/RS485 interfaces meet the ANSI/EIA/T IA574-1990 requirements;

d) using the RS422 interface should be consistent with GB/T 11014-1989 requirements.

5.3.8 anti-environmental performance of transport

Gauge in packaging intact state, to simulate the transport, storage and basic environmental conditions of high temperature test, low temperature test, humidity test and drop

Test, after completion of the test, open the package, the gauge should be intact, and the results should meet the requirements of 5.1, 5.2 and 5.3.

5.3.9 regulatory integrity of judgment

When the gauge is not connected regulating or regulation of damage, the vacuum gauge should be special instructions (specifically prompted by the manufacturer to the method in the technical documentation

Where.

delta --- relative error;

Pm --- vacuum gauge indicated value be corrected;

Pr --- standard gauge pressure.

6.4.3 Power supply voltage stability and affect the amount of test

6.4.3.1

instrument before testing warm-up time not less than 30min. The gauge is equipped with a vacuum gauge and a vacuum system connected to a vacuum

Chamber is at atmospheric pressure regulate the vacuum gauge full scale, the degree of vacuum in the vacuum chamber above a stable pressure of 1.0 × 10-2Pa, regulate

Gauge zero. Then the vacuum chamber is at atmospheric pressure to re-regulate the vacuum gauge full scale, higher than the degree of vacuum in the vacuum chamber

When a steady pressure 1.0 × 10-2Pa re-regulate the vacuum gauge zero. Repeat this process 2 or 3 times to confirm regulate true

Empty and full-scale count of zero.

6.4.3.2

adjusted zero, 1h drift observed after vacuum gauge indicated value, the results shall comply with the provisions of 5.3.3.1.

6.4.3.3

adjusted full scale, 1h drift observed after vacuum gauge indicated value, the results shall comply with the provisions of 5.3.3.2.

6.4.3.4

adjusted zero, maintaining a constant pressure system, so that the power supply voltage variation is within the range of 220V ± 22V, vacuum gauge indicated value

Drift shall comply with the provisions of 5.3.4.1.

6.4.3.5

adjusted full scale, maintaining the system pressure constant, so that the power supply voltage variation is within the range of 220V ± 22V, vacuum gauge indicated value

Drift shall comply with the provisions of 5.3.4.2.

6.4.4 Safety performance test

6.4.4.1

Dielectric strength test according to the provisions of 6.8 GB 4793.1-2007 and its results should be consistent with the provisions of 5.3.5.1.

6.4.4.2

with 500V insulation resistance meter Insulation resistance measuring vacuum gauge power supply terminal and the chassis between the shell and the results should be consistent 5.3.5.2 requirements.

6.4.5 Test analog output signal

6.4.5.1

DC voltmeter with 0.5 analog DC voltage signal output according to the provisions in the technical documentation the manufacturer for testing.

6.4.5.2

DC ammeter with 0.5 analog DC output current signal according to the provisions in the technical documentation the manufacturer for testing.

6.4.6 switch output interface communication interface test

For testing by the manufacturer in the technical documentation requirements.

6.4.7 anti transport environmental performance test

In the vacuum gauge package in good condition, according to GB/T 25480-2010 requirements. among them.

a) High Temperature Test selection. 55 °C ± 2 °C;

b) Cryogenic Test selection. -25 °C ± 2 °C;

c) selection of damp heat test. the relative humidity (25 °C) 95%;

d) the choice of drop test. Free fall height 250mm.

6.4.8 Analyzing the regulatory integrity test

6.4.8.1

do not take direct regulatory power, specified by the manufacturer in the technical documentation to check whether there are special instructions.

6.4.8.2 Connect regulatory power, recorded at the output state

The regulatory unplug record the output state again. Check it twice

Whether the output state of the recording changes specified by the manufacturer in the technical documentation to check whether there are special instructions.

7.1 Inspection classification

Vacuum gauge inspection is divided into.

a) factory inspection;

b) setting test;

c) periodic inspection.

7.2 factory inspection

7.2.1

factory inspection by the manufacturer and the quality inspection department by one test, after passing the issue of product certification before they leave the factory.

Clause No. Table 7.2.2 factory inspection items, requirements and test methods 1.

Table 1

Test item number required

Clause No.

Test Method

Clause No.

Factory inspection stereotypes inspection cycle test

7.3 Inspection stereotypes

7.3.1

have one of the following circumstances, should be finalized test.

a) new product design or production models when stereotypes;

b) when old products to the plant;

c) the design, structure, processes, materials, and have a greater change that may affect product performance;

d) quality supervision agency requirements.

Sample test 7.3.2 stereotypes of three, test items shown in Table 1, all projects should meet the requirements specified.

7.3.3

stereotypes factory inspection performed by the quality inspection department, quality inspection technology can also be entrusted to bodies, the inspection reports should be issued by stereotypes.

7.3.4

passed the test by setting the vacuum gauge should be renovated, near the end or the end of life replacement parts, and re-delivery inspection.

After passing inspection certificate issued by the product, allowing the factory.

7.4 Periodic Inspection

7.4.1 General

Periodically test at one of the following situations.

a) normal production test at least once every two years;

b) one year after the product discontinuation, resume production;

c) test results and factory tests in the last cycle are quite different;

d) quality supervision agency requirements.

7.4.2 Test items

Clause No. periodic inspection items, requirements and test methods are shown in Table 1.

7.4.3 Sampling plan and decision rules

7.4.3.1

Periodic inspection adopted GB/T 2829-2002 I in determining the level of a sampling program.

Substandard classification 7.4.3.2 periodic inspection program, substandard quality level (RQL), determine the level (DL) and determining an array (Ac, Re) see

Table 2.

Table 2

No.

Substandard classification

Test items and Clause No.

Item Clause No.

Substandard quality

Level (RQL)

Discrimination of Water

Level (DL)

Sampling plan

Determining the amount of sample n array (Ac, Re)

Regulatory

Indicates the range

The relative error in the measurement range stability

Power supply voltage influence quantity

Safety Performance

Analog output signal

Switch output interfaces and communication interfaces

Anti-environmental performance of transport

Regulatory integrity of judgment

Exterior

5.2

5.3.1

5.3.2

5.3.3

5.3.4

5.3.5

5.3.6

5.3.7

5.3.8

5.3.9

5.1

I 3 (0,1) (1,2) 7.4.3.3 Periodic inspection according to the provisions of GB/T 2829-2002 will be pass or fail judgment, in which the quality of batches per hundred units not

Eligible numbers.

7.4.4 Sample extraction

Sample test cycle should be randomly selected in the factory inspection qualified products.

7.4.5 Disposal after the test period

7.4.5.1

cycle test failed, should analyze the causes, identify problems and implement measures to re-cycle test. If not re-cycle test

Qualified, should suspend production for rectification, stop products factory inspection, to be solved after the inspection period, before resuming the factory inspection.

7.4.5.2

If the periodic inspection, inspected by the factory batch as qualified products factory or warehouse.

8 signs, packaging, transportation and storage

8.1 mark

Product shall have the following eye-catching logo durability.

a) the name of the manufacturer;

b) the product type and name;

c) indication range, measuring range relative error and other products the main parameters;

d) the date of manufacture;

e) serial number.

8.2 Packaging

8.2.1

gauge should be used in shock, moisture and compression protective packaging.

8.2.2

the text on the box should be clear, including manufacturer name, product type, name, date of packaging and GB/T 191-2008 provisions

Fragile items, up and afraid of the rain and other signs.

8.2.3

Each gauge package should be accompanied by packing lists, instruction manuals, and product certification.

8.3 Transport

In the vacuum gauge packed full of conditions, allows general vehicle transport. Transport process should prevent severe vibration, impact and

Rain.

8.4 Storage

The product should be stored in original box ambient temperature 0 °C ~ 40 °C, relative humidity less than 85% of a well-ventilated room. Should possibly causing

From the corrosive acid, alkali gas is present, there is not the presence of a strong magnetic field. Storage period should not exceed one year.