Safety Specification for industrial microwave heating equipment

　　GB/T refers to the recommendation of the national standard (GB/T), GB that is the national standard of Chinese Pinyin abbreviation, T is recommended.

　　Recommended national standard refers to the production, exchange, use and other aspects, through economic means to regulate the voluntary standards for a class, also called voluntary standards. These standards any units have the right to decide whether to adopt, in violation of these standards, do not assume economic or legal responsibility. But, by accepting and using the parties agreed on, or in the economic contract, the parties must become the basis to abide by the binding law.

　　The sixth part: industrial microwave heating equipment safety rules.

　　1 range

　　This part of GB 5959 applies to the use of microwave energy alone or the use of microwave energy and other forms of energy can be used for industrial heating equipment.

　　This part applies to the working frequency of 300 MHz to 300 GHz industrial microwave heating equipment.

　　This part does not apply to household and similar appliances (which are covered by GB 4706.21 and IEC 60335-2-90).

　　2 normative references

　　The following documents and the terms of the provisions of this part through the GB 5959 reference in this part. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this part, however, encourage the parties according to the latest version of this part of an agreement whether these documents can be used. For undated references, the latest edition is suitable for this part.

　　GB/T 2900.23 Electrotechnical terminology industrial electric heating equipment (GB/T 2900.23--1995, NEQ IEC 60050-841:1983).

　　GB 5959.1--2005 electric heating equipment safety part first: General requirements (IEC 60519-1:2003, IDT).

　　GB/T 18662--2002 industrial microwave heating equipment output power measurement method (EQV IEC 61307:1994).

　　GB 4824--2004 industrial, scientific and medical (ISM) radio frequency equipment electromagnetic disturbance characteristics limits and methods of measurement (CI SPRII:2003, IDT).

　　GB/T 16855.1--2005 mechanical safety control system relating to safety Part 1: general design rules (IS0 13849-1:1999, MOD).

　　Hygienic standard for microwave radiation in GB 10436--1989 workplace.

　　GB 5294--2001 occupational exposure personal monitoring standard external radiation monitoring.

　　3 terms and definitions

　　GB 5959.1N2005 third, GB/T 2900.23, and the following terms and definitions apply to this section.

　　Three point one

　　Microwave energy generator microwave energy generator

　　Electromagnetic energy generator with frequency range from 300MHz to 300 GHz

　　Three point two

　　Microwave heating equipment microwave heating equipment.

　　An assembly consisting of electrical and mechanical components used to transmit microwave energy to the processed material, usually including a power supply, generator, an application, a connecting cable and a waveguide, a control circuit, a material transfer device, and a ventilation device.

　　Three point three

　　Processed material material to be treated.

　　A substance heated by a microwave heating device.

　　Three point four

　　Microwave leakage microwave neakage.

　　Microwave leakage energy from microwave heating equipment.

　　Three point five

　　Application applicator

　　The part of a microwave heating device that is loaded with material and exposed to microwave energy.

　　Three point six

　　Application gate means of access

　　The application can be turned on or off without a tool to access all the components inside the application.

　　Three point seven

　　Cabinet door door

　　In addition to the application of the microwave heating equipment, no need to be able to open or remove any spare parts of the structure of the population.

　　Three point eight

　　Cover cover

　　Microwave heating equipment on the use of any tool can be opened or unloaded, for routine maintenance, service and replacement of parts to provide the structure of the population.

　　Three point nine

　　Import or export entrance or exit port

　　Continuous microwave heating equipment on the application of permanent openings, processed materials through the mouth of the input or output applications.

　　Three point one zero

　　Accessible site accessib location.

　　Refers to the parts of the staff in addition to the import and export, easy access to the staff.

　　Note: the interior of the outer surface of the inlet or outlet is considered to be accessible.

　　Three point one one

　　Microwave interlock microwave interlock.

　　A mechanical or electrical safety device or system of a microwave heating device whose function is to prevent an accident at the other level.

　　Note 1: for example, if the door is not closed, the microwave generator will be disabled.

　　Note 2: for interlocking design, see GB/T 16855.1--2005.

　　4 nameplates and signs

　　The nameplate fixed on each microwave heating equipment shall contain the following contents:

　　Name of manufacturer;

　　Manufacturing date;

　　- equipment type and serial number;

　　Microwave warning signs;

　　- rated input voltage and frequency;

　　Rated apparent input power (kVA);

　　- internal maximum voltage, microwave frequency and maximum output power of the microwave generator according to GB 4824--2004;

　　- according to the level and category of GB 4824--2004.

　　In addition, it should be noted that this equipment is for industrial use only.

　　Note: for additional labeling requirements, see GB 5959.1--2005.

　　Instructions should also be given to the type of generator and the full address of the manufacturer.

　　With the import and export of microwave heating equipment or easy application of ventilation alone L close to the mouth or vent, should be in and out of each near the striking position, with one or more languages need to clearly mark the following or a similar warning:

　　Warning

　　Microwave radiation hazard.

　　Do not insert foreign objects.

　　The relevant information shall be given on the nameplate or in the documentation of the manufacturer.

　　5 protection against electric shock

　　Microwave heating equipment design, manufacture and operation should be able to fully prevent the risk of electric shock.

　　The equipment shall comply with the requirements of the relevant provisions of the GB 5959.1--2005 note that the terms of the GB 5959.1--2005 do not apply to the part of the circuit at microwave frequencies.

　　6 microwave leakage protection

　　6.1 microwave leakage limit

　　The design, manufacture and operation of 6.1.1 microwave heating equipment should be able to effectively prevent the radiation risk caused by microwave leakage.

　　In the event that the application may be exposed to some part of the body (see 3.10) and have more than the allowable limits of the hazard of microwave leakage, all equipment shall be provided with protective measures, such as a cabinet door or barrier with interlocking (see 3.11).

　　In the microwave heating equipment in normal operation state, at a distance of any part of the distance is equal to or greater than 0.05 M to meet any nearby, the leakage of microwave power density should be less than 50 W/m2 (5 m W/cm2); in the "non normal operation state of the equipment, it should be no more than lOOW/m2.

　　The maximum microwave leakage should be measured by the instrument to meet the requirements of the 6.2 to determine whether it meets the requirements of this clause in the operation of the microwave heating system in the manner specified in 6.3.

　　The 6.1.2 is equipped with a microwave heating apparatus with a barrier to restrict the distance between the personnel and the distance. 　　If the barrier is provided with a microwave interlock with 6.4.2, it is subject to the provisions of this article.

　　6.1.3 this section specifies the microwave leakage value (refer to the emission value) measured at a distance of 0.05 m away from any accessible part of the microwave heating equipment.

　　Note: GB 10436--1989 provides the maximum amount of radiation for the operator"s microwave radiation.

　　6.2 measurement of microwave leakage

　　Microwave leakage shall be measured in accordance with the following requirements:

　　A) for step input signal, the instrument should be within 2 s ~ 3 s to achieve the actual stability of the value of 90%;

　　B has a non polarized radiation detector that can work only in the vicinity;

　　C measurement of microwave heating equipment operating frequency can be 25%/ 20% (a ldB) accuracy of 50 W/m2.

　　LOOW/m2 power density (plane wave).

　　6.3 measurement conditions

　　6.3.1 normal operation

　　According to the microwave heating equipment manufacturers and users of negotiation allows work under the condition of microwave power input range and type of materials, measured from any close to the maximum of 0.05 M or any part of the microwave equipment further leaks.

　　6.3.2 on load abnormal operation

　　The 6.3.1 measurements should be repeated in the case of the discharge or opening of all enclosure doors, the door of the application, and the cover plate. However, when the discharge is switched off or turned on, the microwave interlock can interrupt the generation of microwave power.

　　The measurement of the 6.3.1 should be repeated in each case with a microwave enclosure door, cover plate, or application door being adjusted to the most unfavorable position of the microwave power.

　　6.3.3 no-load abnormal operation

　　In the application of a material to be processed and the microwave energy maximum power generator to adjust equipment interlocking device allowed or not to make the maximum power microwave heating system is damaged, repeated 6.3.1 and 6.3.2 measurements.

　　6.4 requirements for microwave interlocking devices

　　6.4.1 application gate

　　Application of microwave heating equipment to open the door, there should be at least two microwave interlock action, the design of interlocking devices should have safety and service life of high long (second risk levels in line with the GB/T 16855.1--2005).

　　When the mechanical or electrical interlock of the application door fails, an alarm should be issued and the microwave heating equipment shall be stopped.

　　When any electrical or mechanical component fails, any microwave interlock of any application door shall not be lost.

　　Each application door shall be provided with at least one microwave interlock which is concealed and will not be used by any part of the body when the door is opened or in any intermediate position.

　　The microwave interlock shall be designed so that when the door is opened or closed, the microwave leakage does not exceed the specified limit of 6.1.

　　6.4.2 door and cover

　　If the microwave heating device"s door or cover plate is opened or unloaded, the microwave leakage exceeds the specified value of 0.1, then the opening or unloading of each cabinet door or cover should have at least one microwave interlock action.

　　In order to ensure safety, two interlocking devices are usually needed.

　　6.4.3 microwave absorber

　　The microwave heating equipment with liquid absorption device of microwave flow, if any one absorbing device in liquid flow at the outlet will reduce leakage more than 6.1 limits of the microwave, you should have at least one microwave interlock action.