GB 4793.6-2008 PDF in English
GB 4793.6-2008 (GB4793.6-2008) PDF English
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Safety requirements for electrical for measurement, control, and laboratory use -- Part 6: Particular requirements for laboratory equipment for the heating of materials
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Standards related to: GB 4793.6-2008
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GB 4793.6-2008: PDF in English GB 4793.6-2008
Safety requirements for electrical for measurement, control, and laboratory use. Part 6. Particular requirements for laboratory equipment for the heating of materials
ICS 19.809
N09
National Standards of People's Republic of China
GB 4793.6-2008/IEC 61110-2-0-10..2005
Replaces GB 4793.6-2001
Electrical equipment for measurement, control and laboratory use
Safety requirements Part 6. Laboratory
Special requirements for heating equipment with materials
(IEC 61110-2-0-10..2005, IDT)
Published.2008-08-30
2009-2009-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Published by China National Standardization Administration
Contents
Foreword III
1 Scope and purpose 1
2 Normative references 1
3 Terms and definitions 1
4 Test 1
5 Signs and documents 2
6 Protection against electric shock 4
7 Protection against mechanical hazards 5
8 Resistance to mechanical shock and impact 5
9 prevent flame spread 6
10 Device temperature limits and heat resistance 6
11 Protection against fluid hazards 7
12 Radiation protection (including laser source), sound pressure and ultrasonic pressure 7
13 Protection against released gases, explosions and implosions 7
14 Components 7
15 Protection by Interlocking Device 8
16 Test and measurement equipment 8
Appendix 9
Reference 9
GB 4793.6-2008/IEC 61110-2-0-10..2005
Foreword
The entire technical content of this section is mandatory.
GB 4793 "Safety requirements for electrical equipment for measurement, control, and laboratory use" is currently divided into 7 parts.
--- Part 1. General requirements (IEC 61010-1);
--- Part 2. Particular requirements for hand-held and hand-operated current sensors for electrical measurement and testing (IEC 6110-2-0232);
--- Part 3. Particular requirements for laboratory mixing and stirring equipment (IEC 61010-2-0051);
--- Part 4. Special requirements for autoclaves for medical materials used in laboratories (IEC 6110-2-0241);
--- Part 5. Safety requirements for hand-held probe assemblies for electrical measurement and testing (IEC 6110-1031);
--- Part 6. Special requirements for laboratory material heating equipment (IEC 6110-2-0-10);
--- Part 7. Special requirements for laboratory centrifuges (IEC 6110-2-20).
Note. The names of the above parts will change as the IEC standard names change.
This part is Part 6 of GB 4793.
This part is equivalent to adopting IEC 6110-2-0-10..2005 "Safety requirements for electrical equipment for measurement, control and laboratory use-Part 2-10
Sub-Special Requirements for Laboratory Heating Equipment (English version). Its technical content, text structure, and expression are in accordance with IEC 6110-
2-10..2005 is completely equivalent.
For ease of use, the following editorial changes have been made in this section.
--- Replace the comma "," with a decimal point "." As a decimal point;
--- Omit the content of the preamble of IEC 6110-2-0-10..2005;
--- For other international standards referenced in IEC 6110-10-2-10..2005, which are equivalent or modified and adopted as our national standards, this
Some of our national standards or industry standards replace the corresponding international standards; the rest are not equivalent or modified and adopted as our national standards
Standard international standards are directly cited in this section.
This section is for GB 4793.6-2001 "Safety laboratory material heating equipment for measurement, control and laboratory electrical equipment
"Special Requirements" (IEC 6110-2-10..1992, IDT).
This section must be combined with GB 4793.1 "Safety requirements for electrical equipment for measurement, control and laboratory use-Part 1. General requirements"
Use. The part that says "applicable" in this part means that the corresponding clause of GB 47.93.1 applies to this part; this part says "replaces" or
The "modified" part indicates that the provisions of this part shall prevail; the part that is marked with "added" in this part indicates that the division shall comply with the corresponding requirements of GB 47393.1.
In addition to the article, the article added in this section must also be met. In order to distinguish the bars in GB 47.93.1, the numbers of the bars added in this section start with 101.
Start, such as 5.2.1101.
Compared with GB 4973.6-2001, this section has major changes. Many clauses have been modified in text. The standard structure follows
GB 4793.1-2007 was adjusted, and some test methods were explained in more detail.
--- Increased the dynamic test of the horizontal heating surface of glass or ceramic materials;
--- Increased surface temperature limits for burn prevention.
This section is proposed by China Machinery Industry Federation.
This section is under the jurisdiction of the National Standardization Technical Committee for Measurement, Control and Laboratory Electrical Equipment Safety (SAC/TC338).
Drafting organization of this section. Institute of Integrated Technology and Economy of Instrumentation for the Machinery Industry.
The main drafters of this section. Pan Changqing, Liu Xiaojing, Zheng Xu, Mei Ke, Ouyang Jinsong, Wang Linyi, Fang Xiaoshi, Wang Jianhua, Zhang Guiling.
The previous versions of the standards replaced by this section are.
--- GB 4793.6-2001.
GB 4793.6-2008/IEC 61110-2-0-10..2005
Electrical equipment for measurement, control and laboratory use
Safety requirements Part 6. Laboratory
Special requirements for heating equipment with materials
1 Scope and purpose
Except for the following, the first chapter of GB 47.93.1 applies.
1.1.1 Equipment to which this section applies
instead.
This article is replaced by the following.
This part of GB 4793 is only applicable to laboratory electrical equipment for material heating. Material heating is the only or one of several functions of the equipment.
Note. If the whole or part of the equipment falls within the scope of this part and the scope of one or more other parts in GB 4793, then it also needs to meet
Requirements of other relevant standards in GB 4793. In particular, if the equipment is intended for IVD purposes, it must also meet the requirements of IEC 6110-2-11
Claim.
1.1.2 Equipment not included in the scope of this part
increase.
Add three new entries after i).
aa) laboratory heating and ventilation equipment;
bb) disinfection equipment;
c) The heating equipment accessible to the operator, that is, the space in the equipment when the door of the equipment is closed is sufficient to accommodate the equipment of the operator.
2 Normative references
The clauses in the following documents become the clauses of this section after being quoted in this section of GB 4793. For dated references,
All subsequent amendments (excluding errata) or revisions are not applicable to this section, however, it is encouraged to reach agreement based on this section
The parties studied whether the latest versions of these documents could be used. For undated references, the latest edition applies to this section.
GB 47.93.1 Safety requirements for electrical equipment for measurement, control and laboratory use-Part 1. General requirements (GB 47.93.1-
2007, IEC 61110-1..2001, IDT)
Chapter 2 of GB 47.93.1 applies.
3 Terms and definitions
Chapter 3 of GB 47.93.1 applies.
4 Test
Except for the following, Chapter 4 of GB 47.93.1 applies.
4.3.2 Device status
increase.
Add the following note after the first paragraph.
Note. When in doubt, the test can be performed under more than one combination of conditions.
4.4.2.1 Heating device
increase.
GB 4793.6-2008/IEC 61110-2-0-10..2005
Add the following new second paragraph.
If overfilling or underfilling of heat-conducting media can cause danger, the equipment should be left unfilled, partially filled, or overfilled
When the test is selected, the less favorable case is selected. When in doubt, the test should be performed under more than one condition. Heat transfer for testing
The conducting medium shall be of a type prescribed for normal use.
4.4.4 Compliance after fault conditions are applied
4.4.4.2
instead.
Replace the second paragraph with the following.
In addition to heating the heated surface of the equipment (see 10.1), whether it is due to heat transfer or due to proximity to a heating element, the surface of the equipment or
The temperature of the parts must not exceed 105 ° C when the ambient temperature is 40 ° C or the maximum rated ambient temperature (if the rated ambient temperature is higher).
(See 1.4.2).
5 Signs and documents
Except for the following, Chapter 5 of GB 47.93.1 applies.
5.1.3 Power supply
increase.
c) Add the following note after.
Note 101. If the actual power or current may be much greater than the maximum rated power or current indicated for 1 min or less after being switched on, it should be at the maximum
Instantaneous maximum values are shown in parentheses following the rated power or current.
5.1.6 Switches and circuit breakers
increase.
Add the third paragraph, which reads as follows.
For drying cabinets and similar equipment, equipment with doors or other openings for loading materials shall have an “on” status indication on each side.
5.2 Warning signs
instead.
Replace the fifth paragraph with the following.
Warning signs are 5.1.5.1c), 5.2.1101, 6.1.2b), 6.1.2.112g), 6.5.2.12g), 6.6.2, 7 .2c), 7.3, 10.1 and
Provided in 13.2.2.
increase.
Add the following new bars.
5.2.101 Equipment with high contact current
For non-permanently connected equipment, if the equipment's contact current exceeds the limit of 6.3.1b) or 6.3.2b), but is still permanently connected
Within the limits of the equipment, there should be warning signs for non-permanent connection to the power supply. The mark should be on or next to the terminal cover connected to the power supply,
The warning should also be stated again in the installation instructions. Symbol 14 in Table 1 is a suitable warning sign. But given the country where the device is used
Homes may not be aware of this sign, so the warning sign should be printed in appropriate language.
Compliance is checked by visual inspection.
5.4.3 Equipment installation
instead.
Documentation should include installation and specific commissioning instructions (various examples are listed below), and if necessary for safety, equipment
Prepare for dangerous warnings during installation and commissioning.
a) Assembly, positioning and installation requirements. If hot objects falling from the equipment pose a danger, for example, when the door is opened,
Warning that the equipment must be installed on the surface of combustible materials;
b) instructions for protective earthing;
GB 4793.6-2008/IEC 61110-2-0-10..2005
c) Connection to power supply. For equipment with dangerous live parts that may need to be touched (see 6.1.2), it shall be stated that the remaining power needs to be installed
Current-operated circuit breakers; when permanently connected to a power source, the necessary warnings and statements must be provided (see 5.2.1101);
d) for permanently connected equipment.
1) Power wiring requirements;
2) Requirements for any external switches or circuit breakers (see 6.11.2.1) and external overcurrent protection devices (see 9.5.1)
And recommendations for placing these switches or circuit breakers near the equipment;
e) ventilation requirements;
f) special maintenance requirements, such as air and coolant;
g) if a measurement is required in 12.5.1, the maximum sound power level produced by the sounding equipment;
h) a description related to the sound pressure level (see 12.5.1);
i) drying requirements (see 5.4.3.101);
ｊ) If the material may release dangerous gases during heating, the installation instructions should include
Warning instructions for safety temperature related temperature limiting devices, etc. (see Note to 5.4.1).
Note. The exhaust system is a system that removes air from the building, not a recirculating system.
Add bar.
5.4.3.1 Drying
If the equipment may not meet all of the safety requirements of this section after transportation or storage under humid conditions, the installation instructions shall specify
The time required to dry the equipment and return it to normal conditions. The instructions should include a warning that the equipment may
Not all safety requirements in this section.
Compliance is checked by visual inspection.
5.4.4 Operation of equipment
increase.
Add the following references after g).
(See 5.4.4.101)
Add the following three new entries.
aa) When access to hazardous live parts is permitted, the operator needs additional protection regulations (see 6.1.2.101);
bb) with regard to any potentially hazardous conditions arising from the explosion, implosion, release of toxic gases or flammable gases from the heated material
Warning [see 5.4.3ｊ)];
c) Specifications for suitable heat transfer media, such as liquids used in hot baths.
Add bar.
5.4.4.11 Cleaning and disinfection
Instructions should include cleaning and, if necessary, disinfection recommendations, as well as common names of approved recommended materials for cleaning and disinfection
Claim, and point out materials that may be used but are not compatible with the equipment parts or materials contained in the equipment.
The instructions should also state that those responsible must ensure that.
a) if hazardous materials leak on the surface of the equipment or enter the equipment, appropriate disinfection should be taken;
b) Do not use cleaning agents or disinfectants that cause a chemical reaction with equipment parts or materials contained in the equipment;
c) If in doubt about the compatibility of disinfectants or cleaning agents with equipment parts or materials contained in equipment, consult the manufacturer or
Its proxy.
If the manufacturer states that an item can be sterilized by steam sterilization, the item should be able to withstand at least one set of time-temperature bars in Table 101
Steam sterilization.
Note 1. Manufacturers should refer to the internationally recognized Laboratory Biosafety Manual, which was published in 1984 by the World Health Organization
The booklet contains information on disinfection use, dilution, characteristics and possible applications. You can also refer to the corresponding domestic guidelines.
Note 2. When maintaining, repairing, replacing laboratory heating equipment and its accessories, cleaning and disinfection are necessary safety measures. The manufacturer should also show proof to the user,
This indicates that the above processing has been performed.
GB 4793.6-2008/IEC 61110-2-0-10..2005
Table 101 Time-temperature conditions
Absolute pressure/kPa
Corresponding steam temperature
Nominal value/℃ Range/℃
Minimum duration/min
325 136.0 0134 ~ 138 3
250 127.5 1126 to 129 10
215 122.5 1121 ～ 124 15
175 116.5 1115 ～ 118 30
Note. "Minimum duration" refers to the duration at steam temperature.
Compliance is checked by visual inspection.
5.4.5 Equipment maintenance
increase.
Add the following two new paragraphs after the first paragraph.
If the power cord uses high temperature or other special cables, the instructions should state that they can only be replaced with equivalent cables.
The instructions shall provide the responsible person with a means to check the existence of overheating or level protection devices or systems necessary for safety purposes.
Effective operation, and the period for conducting inspections shall be stated.
6 Protection against electric shock
Except for the following, Chapter 6 of GB 47.93.1 applies.
6.1 Overview
Add bar.
6.1.2.1 Exceptions to heating furnaces
Accessible hazardous live parts are permitted if it is not possible to operate the furnace effectively for one or more of the following reasons.
a) Need frequent access (such as chain-type open hearth and tube furnaces);
b) holes for observation or insertion of sensors or probes;
c) A constant operating temperature must be maintained to protect the material being treated from thermal shock, so that it is accessible when the door is opened
Components, etc. must remain energized.
In such cases, accessible internal parts are only allowed to be charged dangerously if all of the following conditions are met.
1) Dangerous live parts are powered by a circuit protected by a residual current operated circuit breaker. The differential current is equal to or less than
The circuit breaker cuts off the power supply at 30 mA; or as specified in the installation instructions, the equipment must be connected with such a circuit breaker
Power supply
2) Warning signs warn of potential dangers, and indicator lights are installed in dangerous places;
3) Conductive conveyor belts, fire hoods, etc. must be connected to the protective conductor terminals;
4) The instruction manual should indicate that the operator must be provided with protection against electric shock, including due to possible simultaneous contact with dangerous live electricity
Parts and components connected to the protective conductor terminals are exposed to electric shock and protective measures are described. Can include one of the following
One or more protection measures.
--- insulated tools;
--- Insulation clothing;
--- Stand on the insulating surface;
--- The panel of the component connected to the protective conductor terminal, so that the operator can touch this under normal use conditions
Some parts.
Compliance is checked by visual inspection.
GB 4793.6-2008/IEC 61110-2-0-10..2005
6.3 Allowable limits of accessible parts
increase.
Add the following new paragraphs.
If the installation instructions specify a drying process (see 5.4.3.101), this process shall be performed before 6.3 measurement. After drying
That is to enter the 2h recovery period, during which the device should be powered off and continue until the measurement is performed.
The device measures at room temperature. If in doubt as to whether the equipment may exceed the allowable limit at the maximum operating temperature,
Relevant measurements are repeated at the highest operating temperature and higher measurements are adopted.
6.3.1 犫) 1) Current
Add the following second paragraph.
The current value of permanently connected equipment is 1.5 times these values.
6.3.2 犫) 1) Current
Add the following second paragraph.
The current value of permanently connected equipment is 1.5 times these values.
6.4 Protection under normal conditions
increase.
Use the original note as Note 1 and then add the following new Note 101.
Note 101. Although ceramics can provide satisfactory electrical insulation at room temperature, their insulation properties will weaken at high temperatures. This is not only due to their vulnerability
The effects of mechanical wear, but also because they can become conductive at high temperatures, and can be contaminated by conductive materials under normal use conditions.
6.8.2 Humidity pretreatment
increase.
For equipment that has provisions for drying (see 5.4.3.101), no wet pretreatment is required.
6.8.3 Implementation of the test
increase.
Add two new paragraphs after the first paragraph.
If the installation instructions specify a drying process (see 5.4.3.101), this process shall be carried out before the 6.8.4 test. After drying
Then enter the 2h recovery period, during which the device should be powered off. Perform and complete the test within 1 h after the end of the recovery period.
If there is doubt as to whether the equipment can pass a specific test at the highest operating temperature, the test should be at the highest operating temperature
Repeat.
6.10.1 Power cord
increase.
In b) add the following.
Alternatively, additional protection should be provided to prevent the power cord from contacting hot surfaces.
In c) add the following.
The rated temperature of the appliance coupler shall be higher than the temperature measured on any part of it under normal conditions.
7 Protection against mechanical hazards
Chapter 7 of GB 47.93.1 applies.
8 Resistance to mechanical shock and impact
Except for the following, Chapter 8 of GB 47.93.1 applies.
8.1.2 Dynamic test
increase.
Add the following as a new third paragraph.
GB 4793.6-2008/IEC 61110-2-0-10..2005
For heating equipment with horizontal surfaces of glass, ceramic or similar materials, such surfaces shall be tested in accordance with 8.101.
Test the rest of the equipment under test in accordance with the following provisions.
Add bar.
8.1.101 Dynamic testing of horizontally heated surfaces of glass or ceramic materials
Conformance inspections required for horizontally heated surfaces made of glass or ceramic materials are checked by conducting the following tests.
a) The heater works at the highest set value until the surface temperature of the heating zone does not exceed 1 ° C within 15min. then,
Turn off the heater, lay the container containing the heavy object flat, and drop it from the height of 150mm to the heating area 10 times. The container has
A flat bottom made of copper or aluminum with a diameter greater than 120 mm ± 10 mm. The container has a round chamfer with a radius of at least
It is 10mm. The container is filled with highly consistent sand or steel balls with a total weight of 1.8 kg ± 0.01 kg.
b) After the above tests are performed for each heating zone in turn, the heater is again operated at the highest set value until the table of the heating zone
15 ° C ± 5 ° C) Pour smoothly on the heated surface. Then turn off the heater and remove all excess on the surface after 15 min.
The solution was removed.
c) Cool the heater to near room temperature, then pour the same mass of salt solution onto the heated surface smoothly, and
The remaining solution was removed.
d) The voltage test shall be carried out in accordance with 6.8.4. The test voltage is the voltage of the basic insulation. No breakdown shall occur.
e) The glass parts must not be broken, causing a risk of scratching.
Note 102. This clause corresponds to 21.102 in IEC 60335-2-6..2002.
九 Prevent the spread of flame
Except for the following, Chapter 9 of GB 47.93.1 applies.
9.4 Requirements for equipment containing or using flammable liquids
increase.
Add the following note after Note 1.
Note 101. The surface temperature of the heating element used to heat the liquid can be much higher than the temperature of the liquid.
10 Device temperature limits and heat resistance
Except for the following, Chapter 10 of GB 47.93.1 applies.
10.1 Limits on surface temperatures against burns
instead.
Replace the second paragraph with the following.
If accessible hot surfaces are necessary for functional reasons, whether due to heat transfer or heating due to proximity to heated parts,
As long as they are identifiable, for example visually or functionally, or marked with the symbol 13 of Table 1 (see 5.2), this is allowed
The temperature of some easily accessible heating surfaces exceeds the value specified in Table 15 under normal conditions, and exceeds 105 ° C under single fault conditions.
Add bar.
10.101 Over temperature protection
If a single failure of a temperature control system, heater, cooling unit, agitator, or other component occurs,
Danger caused by overheating of components or materials being processed, then a non-automatic reset overtemperature device or system meeting the requirements of 14.3
Turn off the power to the heating device and other dangerous parts.
If an insufficient amount of heat-conducting liquid may cause danger, the level device of automatic reset or non-automatic reset should cut off the heating device
And other dangerous power sources.
Power off the equipment or related components in one of the following ways.
a) For single-phase equipment, use a unipolar device or system; parts controlled by the overtemperature device of the temperature control system, cut off the temperature
The corresponding conductor of the control system;
GB 4793.6-2008/IEC 61110-2-0-10..2005
b) for multiphase equipment, all phases are disconnected by a single device or system, or each phase has a separate disconnection device or system;
c) A device or system can disconnect all poles of the power supply.
Note 1. The above-mentioned unipolar over-temperature protection device meets the safety requirements of this section under single fault conditions. However, disconnect all poles of the power supply from related parts.
An over-temperature protection device has the advantage of providing protection in the event that a component (eg, a grounded part of an isolated power supply) is not found faulty.
Although the failure does not reduce the performance or safety of the component, it may increase the possibility of subsequent failure in the temperature control system and cause danger.
Note 2. On equipment designed for heating materials, hazards can be caused by excessive heating of the material being processed or the heat-conducting medium (mainly in the heat bath), and by
Caused by overheating of parts of the equipment itself. Therefore, it may be necessary to provide a higher level of safety in a device for a single fault.
Note 3. In some cases, a decrease in the temperature of the heated medium (for example, liquid in a heating tank or gas in a heating furnace or heating box) may cause danger.
risk. If the operation of the over-temperature protection device will cause the above situation after the temperature control system fails, install another device that does not pass the over-temperature
Temperature control system to maintain a safe temperature.
The equipment used to hold flammable materials, whether used for operation or heat conduction, is set when directly set according to the manufacturer's instructions.
The temperature protection device or system shall ensure that the liquid shall not exceed the temperature specified in 9.4 a) under normal use or single fault conditions.
Note 4. Normal use (referring to the manufacturer's instructions during use) includes the correct setting of each adjustable over-temperature protection device. Using tools for over temperature
The protection device is incorrectly set as its own single fault condition, so any other single fault condition test should be performed according to the manufacturer
The setting of the over-temperature protection device or system in the book is performed.
Over-temperature protection devices required for safety shall be isolated from each temperature control system. This requirement applies not only to temperature sensing devices but also
It is also suitable for all disconnecting devices in the circuit for power off. Whether it is operated by temperature, pressure, liquid level, air flow or oth......
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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