What is a Security Metal Detector?

A metal detector is a widely used detector. There are three main categories: electromagnetic induction type, X-ray detection type, and microwave detection type. They are electronic instruments used to detect metals and can be applied in many fields.

metal detector

A metal detector is a widely used detector. There are three main categories: electromagnetic induction type, X-ray detection type, and microwave detection type. They are electronic instruments used to detect metals and can be applied in many fields.
In the military, metal detectors can be used to detect metal mines; in the security field, they can detect weapons or crime tools that they carry or hide; in archeology, they can detect ancient tombs with buried metal items, and find gold and silver treasures And jewelry or other metal products; in engineering, it can be used to detect underground metal buried objects, such as pipelines, pipelines, etc .; in mineral exploration, it can be used to detect and find natural gold particles; industrially, it can be used for online monitoring, such as removing cotton , Coal, metal debris in food, etc. [1-2]
Compared with traditional detectors: special design of working area in detection area
Metal detectors not only detect
Metal detectors for the food industry
In the food industry, metal detectors are mainly used for the detection of metal impurities. There are two types of metal detectors for food: belt type and pipeline type. The belt type is a conveyor belt. When food is placed on the belt and passed through the probe, it will alarm or stop if it contains metal impurities. Pipeline type is mainly free-fall type, food
the first
1. Turn on the power switch (8). When you hear a "click" sound, the power is on and the green light is on. If the green light is off, the battery is not installed or the battery is not in good contact. If the continuous sound or vibration continuously indicates that the battery can no longer be used, the battery should be replaced with a new one.
2. Sound and vibration switch selection: press the red button switch (10), the alarm mode is vibration. Release the red button switch (10), and the alarm mode is sound.
3. After turning on the power, you can perform high-sensitivity detection. Hold the handle to scan the detection surface around the measured object. When there is a metal object, an alarm sound or vibration will be emitted. At the same time, the green light will change to red light; The alarm sound or vibration will stop and the red light will turn green.
4. Low-sensitivity test: If you need to exclude small objects in metal, you can press and hold the low-sensitivity switch (7). When scanning around the measured object, an alarm sound or vibration will be issued when there is a metal object. At the same time, the green light will turn into a red light; when the scanning is stopped, the sound or vibration will stop and the red light will turn into a green light. Because the sensitivity is reduced by more than 5 times. Therefore, generally large metal objects are detected at this time.
Sensitivity adjustment:
1. If the detection distance does not meet the required requirements or the sensitivity is too high to cause instability or to emit sound or vibration to the human body without metal scanning, sensitivity adjustment should be performed.
2. Put the sound and vibration switch (10) in the "release" state, and use a small
A flat-blade screwdriver protrudes from the small hole in the handle of the detector to rotate clockwise to adjust
Turn to the sound, then turn it counterclockwise to turn it to the right, and then turn it counterclockwise half a turn, until the sensitivity meets the requirements.
Precautions
1. Do not forget to turn off the power after use.
2. Remove the battery if not used for a long time.
3. When the probe is fixed against a metal object, it will not make sound or vibration, it will only make a sound or vibration when it is swept over the metal object.
4. When charging, turn off the power switch (8). Charger voltage: AC 9V; DC 10V. (Charger supplied)
The world's first metal detector was born in 1931. It was invented by Dr. Fisher (Gerhard R. Fisher) in the Fisher Laboratories in Palo Alto, California, and was named Metalloscope (M-Scope for short). ) And patented. [4-5]
1. Market analysis by function:
1) All-metal detector: can detect all kinds of metal impurities of different materials, so this product currently has the highest market share in the global market, and it is more popular with various users. And this product is very versatile, mainly used
A is specially used for the detection of iron and non-ferrous metal impurities in foods such as meat, fungi, candy, beverages, food, fruits and vegetables, dairy products, aquatic products, health products, additives and condiments.
B For metal impurities detection in chemical raw materials, rubber, plastics, textiles, leather, chemical fiber, toys
C. Metal impurities used in medicine, health products, biological products, cosmetics, gifts, packaging, paper products
2) Iron metal detector, also called "
1. Purpose : normative pair
(National Standard for Food Metal Detection)
1 range
This standard specifies the terms and definitions, model names, technical requirements, test methods, inspection rules, marking, packaging, transportation, and storage requirements of food metal detectors.
This standard applies to the design, manufacture, and inspection of metal detectors for food (excluding metal packaging).
2 Normative references
The clauses in the following documents have become the clauses of this standard after being referenced. For dated references, all subsequent amendments (excluding the content of errata) or revisions are not applicable to this standard, however, all parties who have reached an agreement in accordance with this standard are encouraged to study whether the latest versions of these documents can be used . For undated references, the latest version applies to this standard.
GB / T3082002 Rolling bearing steel ball
GB / T2423.12008 Environmental test for electric and electronic products Part 2: Test method Test A: Low temperature
GB / T2423.22008 Environmental test for electric and electronic products Part 2: Test method Test A: High temperature
GB / T2423.32006 Environmental test for electric and electronic products Part 2: Test method Test Cab: Constant temperature test
GB 42082008 enclosure protection level (IP code)
GB 5226.12008 Mechanical and electrical safety. Mechanical and electrical equipment. Part 1: General technical requirements
GB 15179 Food Machinery Grease
GB 167981997 Food Machinery Safety and Hygiene
GB / T 17626.42008 Electromagnetic compatibility test and measurement technology Electrical fast transient pulse group immunity test
GB / T 17626.52008 Electromagnetic compatibility test and measurement technology Surge (impact) immunity test
GB / T17626.112008 Electromagnetic compatibility test and measurement technology Immunity test for voltage sags, short interruptions and voltage changes
SB / T2282007 General technical conditions of food machinery
3 terms and definitions
The following terms and definitions apply to this standard.
3.1
Metal detector for food
Device capable of detecting and warning metal impurities in food.
3.2
Sensitivity
The smallest metal object that can be reliably detected.
3.3
Detecting hole
Design the cross-section size through which the measured object passes.
3.4
Detecting position
Probe the center point of the hole.
4 Model naming
Custom serial number of production enterprise (Label number)
Customized code of production company (English letters, uppercase)
Probe hole geometry, distance: width and height, circle: diameter
Detection hole shape, R distance, C circle
Metal detectors for the food industry
Example 1: Metal detector for food industry
Rectangular detection hole, detection hole width 500mm, height 200mm
Customized by manufacturer, serial number (Al)
Example 2: Metal detector for food industry
Round detection hole, detection hole diameter 200mm
Customized code and serial number of production enterprise (Al)
5 technical requirements
5.1 General requirements
5.1.1 Appearance
The conveyor belt of the detector should be free of pollution, the outer surface of the detector should be free of damage and defects, the knobs and switches should be flexible to operate, the display and indication parts should be clearly visible, and the coating and plating layer should be smooth and uniform, without rust, without peeling, No obvious scratches, no wrinkles and other defects.
5.1.2 Normal working sensitivity
According to the standard sample (see Appendix A), the material and the shape of the detection hole should meet the requirements of Tables 1 to 4 respectively.
Table 1 Magnetically permeable material, Sensitivity of distance detection hole is mm
height
width
300
350
400
450
500
550
600
100
0.8
0.8
0.8
1.0
1.0
1.0
1.2
150
1.0
1.0
1.0
1.2
1.2
1.2
1.5
200
1.2
1.2
1.2
1.5
1.5
1.5
2.0
250
1.5
1.5
1.5
2.0
2.0
2.0
2.5
300
2.0
2.0
2.0
2.5
2.5
2.5
3.0
350
2.0
2.0
2.5
2.5
3.0
3.0
Note indicates that the sensitivity is not specified.
Table 2 Sensitivity of non-magnetic material, rectangular detection hole in mm
height
width
300
350
400
450
500
550
600
100
1.0
1.0
1.0
1.2
1.2
1.2
1.5
150
1.2
1.2
1.2
1.5
1.5
1.5
2.0
Table 2 (continued) Units are mm
height
width
300
350
400
450
500
550
600
200
1.5
1.5
1.5
2.0
2.0
2.0
2.5
250
2.0
2.0
2.0
2.5
2.5
2.5
3.0
300
2.5
2.5
2.5
3.0
3.0
3.0
-
350
3.0
3.0
3.0
-
-
-
-
Note: "-" indicates that the sensitivity is not determined.
Table 3 Sensitivity of magnetically permeable material and round detection hole is mm
Detection hole diameter
100
150
200
250
300
350
400
Sensitivity
0.8
1.0
1.2
1.5
2.0
2.5
3.0
Table 4 Sensitivity unit of non-magnetic material and circular detection hole is millimeter
Detection hole diameter
100
150
200
250
300
350
400
Sensitivity
0.8
1.0
1.2
1.5
2.0
2.5
-
Note: "-" indicates that the sensitivity is not determined.
5.1.3 Moisture and heat environment sensitivity
According to the standard pattern material and the shape of the detection hole should meet the requirements of Table 5-- Table 8 respectively.
Table 5 Magnetically permeable material, rectangular detection hole sensitivity unit is millimeter
height
width
300
350
400
450
500
550
600
100
1.0
1.0
1.0
1.2
1.2
1.2
1.5
150
1.2
1.2
1.2
1.5
1.5
1.5
2.0
200
1.5
1.5
1.5
2.0
2.0
2.0
2.5
250
2.0
2.0
2.0
2.5
2.5
2.5
3.0
300
2.5
2.5
2.5
3.0
3.0
3.0
-
350
3.0
3.0
3.0
-
-
-
-
Note: "-" indicates that the sensitivity is not determined.
Table 6 Sensitivity unit of non-magnetic material and rectangular detection hole is millimeter
height
width
300
350
400
450
500
550
600
100
1.2
1.2
1.2
1.5
1.5
1.5
2.0
150
1.5
1.5
1.5
2.0
2.0
2.0
2.5
200
2.0
2.0
2.0
2.5
2.5
2.5
3.0
250
2.5
2.5
2.5
3.0
3.0
3.0
-
300
3.0
3.0
3.0
-
-
-
-
350
-
-
-
-
-
-
-
Note: "-" indicates that the sensitivity is not determined.
Table 7 Sensitivity of magnetically permeable material and round detection hole is mm
Detection hole diameter
100
150
200
250
300
350
400
Sensitivity
1.0
1.2
1.5
2.0
2.5
3.0
-
Note: "-" indicates that the sensitivity is not determined.
Table 8 Sensitivity unit of magnetically permeable material and circular detection hole is mm
Detection hole diameter
100
150
200
250
300
350
400
Sensitivity
1.2
1.5
2.0
2.5
3.0
-
-
Note: "-" indicates that the sensitivity is not determined.

Metal detector power range

The applicable voltage of the detector is 187V--242V, and the applicable frequency is 47.5Hz--52.5Hz.

Working hours of metal detectors

The continuous stable working time of the detector should not be less than 4h.

Metal detector compatibility

5.1.6.1 Immunity performance of electrical fast transient bursts
The electrical fast transient pulse group immunity performance of the detector meets the requirements of level 2 in GB / T 17626.4-2008, allowing the basic functions to be temporarily reduced or lost, but it should be able to return to normal after the experiment is completed. The data stored in the detector should not be lost after the test.
5.1.6.2 Surge (Shock) Immunity Performance
The surge (shock) immunity performance of the detector meets the level 2 requirements in GB / T 17626.5-2008, allowing the basic functions to be temporarily reduced or lost, but it should be able to return to normal by itself after the experiment. There should be no electrical failure after the test, and the stored data in the system should not be lost.
5.1.6.3 Immunity performance of voltage sag, short-term interruption
The voltage sag and short-term interruption immunity performance of the detector meets the level 2 requirements in GB / T 17626.11-2008, allowing the basic functions to be temporarily reduced or lost, but it should be able to return to normal after the experiment. There should be no electrical failure after the test, and the stored data in the system should not be lost.
5.1.7 Conveyor Speed
Speed adjustable, the range is not less than 5m / min--30m / min.
5.1.8 Warning signal and output control signal interface
The detector should have sound warning or (and) light warning functions; the detector should have at least one output control signal interface.
5.1.9 Counting Statistics Function
The detector shall have the function of counting and counting food containing metal impurities.
5.1.10 Communication interface
The detector should have a communication interface that complies with relevant standards.
5.2 Hygiene requirements
5.2.1 Materials
5.2.1.1 The materials of the detector in direct contact with food shall comply with the relevant provisions of Chapter 4 of GB 16798-1997.
5.2.1.2 Materials in which the detector is not in direct contact with food shall not cause harm to the food toilet.
5.2.2 Spraying
When the surface spraying of the detector is adopted, it shall meet the relevant regulations of GB / T 228-2007.
5.2.3 Lubrication
5.2.3.1 Any transmission parts and bearings in contact with the product shall be of non-lubricated type.
5.2.3.2 The grease selected for the detector should meet the requirements of GB 15179.
5.3 Safety requirements
5.3.1 Mechanical components
The gears, belts, chains, friction wheels and other moving parts of the detector shall be provided with protective covers. Detector parts and fasteners such as bolts and nuts should be reliably fixed to prevent loosening and should not fall off due to vibration.
5.3.2 Electrical installation
The electrical installation of the detector shall be reliable and safe to use, and shall comply with the relevant regulations of GB 5226.1-2008.
5.3.3 Insulation resistance
5.3.3.1 When the temperature is 20 ° C ± 5 ° C and the relative humidity is not greater than 75%, the insulation resistance between the power input end of the detector and the accessible metal part of the casing shall not be less than 20M.
5.3.3.2 After the moist heat test, the insulation resistance between the power input terminal of the detector and the accessible metal part of the casing shall not be less than 2M.
5.3.4 Electric strength
Apply a sinusoidal AC voltage of 50Hz and effective value of 1500V between the detector's power input and the metal case of the detector for 1min. There should be no flashover, flashover and breakdown. After the test, the detector should have no electrical failure. Function should be normal.
5.3.5 Ground Resistance
The resistance between the ground terminal or ground contact and accessible metal parts (excluding the part of the test probe) should not exceed 0.5.
5.3.6 Protection level
The protection level of the detector housing should meet the requirements of IP54 specified in GB 4208-2008.
6 test methods
6.1 Test conditions
6.1.1 Test requirements
Except for tests that specifically state environmental conditions, the remaining tests shall be performed under the following environmental conditions:
a. Temperature: 15 -35 ;
b. Relative humidity: 45% -75%;
c. Atmospheric pressure: 86 kPa-106 kPa;
d. Moving metal objects: 2.0m away from any part of the detector;
e. Static metal objects: 1.5m away from any part of the detector;
f. No strong electromagnetic field interference;
g. Conveyor speed: 20m / min;
h. Working mode: set the detector in continuous operation mode;
i. Photoelectric proximity switch: If there is a photoelectric proximity switch to prevent false alarms, it should be disabled.
6.1.2 Accuracy of test instruments
The accuracy of the instruments used in the test should meet the following requirements:
1) Frequency conversion transformer power supply, frequency resolution 0.1Hz, voltage resolution 0.1V, total harmonic distortion of voltage 3%;
2) 5-1 / 2-digit digital voltage / current meter accuracy is not less than 0.5, and the factory inspection is not less than 1;
3) 3-1 / 2 digit digital thermometer, the error is not greater than 0.5 ;
4) 3-1 / 2 digit digital hygrometer, the error is not greater than 2%;
5) 3-1 / 2 digit digital tachometer, the error is not greater than 2%;
6) DC voltage 500V megohmmeter, accuracy is not less than 1.0;
7) The accuracy of the timer is within 0.1s.
6.1.3 Test requirements
6.1.3.1 Pass the standard samples of magnetically permeable and non-magnetic materials through the detection position 10 times each. The interval between each time the standard sample passes the detection position is 10s ± 2s, so that the smallest diameter that can be reliably detected each time. The standard sample diameter is used as the sensitivity parameter of the detector.
It is recommended to start the test with the smallest diameter standard sample and gradually increase the diameter of the standard sample until it can be reliably detected.
6.1.3.2 Take the standard sample that meets the requirements of 5.1.2 as the test sample, pass the standard sample of magnetically permeable material and non-magnetic material through the test position 5 times each, and the interval time between each time the standard sample passes the test position is 10s ± 2s.
6.1.3.3 The standard sample that meets the requirements of 5.1.3 is used as the test sample, and the standard sample of magnetically permeable and non-magnetic material is passed through the test position five times each. The interval between each time the standard sample passes the test position is 10s ± 2s.
6.1.4 Visual inspection
Visual inspection.
6.1.5 Normal working sensitivity detection
6.1.5.1 High temperature environment detection
The test environment meets the requirements of the Bb clause of GB / T 2423.2--2008, with a severity rating of + 40 ° C / 2h. The output frequency of the variable frequency voltage power supply is set at 50Hz, and the voltage is set at 242V, which is tested according to the requirements of 6.1.3.2.
6.1.5.2 High temperature storage test
The test environment meets the requirements of the Bb clause of GB / T 2423.2-2008, with a severity rating of + 70 ° C / 2h. The output frequency of the variable frequency voltage power supply is set at 50Hz and the voltage is set at 220V. After meeting the requirements, it will recover for 2h under normal atmospheric conditions and test according to 6.1.3.2.
6.1.5.3 Low temperature environment detection
The test environment meets the requirements of Ab clauses of GB / T 2423.2-2008, and the severity level is -5 / 2h. The output frequency of the variable frequency voltage power supply is set at 50Hz, and the voltage is set at 187V, which is tested according to the requirements of 6.1.3.2.
6.1.5.4 Low temperature storage test
The test environment meets the requirements of Ab clauses of GB / T 2423.2-2008, and the severity level is -25 / 2h. The output frequency of the variable frequency voltage power supply is set at 50Hz and the voltage is set at 220V. After meeting the requirements, it will recover for 2h under normal atmospheric conditions and test according to 6.1.3.2.
6.1.6 Sensitivity detection in hot and humid environment
The test environment meets the requirements of GB / T 2423.2-2006, with a severe level of (40 ± 2) ° C, (85 ± 3)% RH, 48h. The output frequency of the variable frequency voltage power supply is set at 50Hz, and the voltage is set at 220V. After reaching the requirements, it will be held for 24h. Turn on the power to keep the detector in working state and continue to hold for 24h, and detect according to the requirements of 6.1.3.3. Recover under normal atmospheric conditions for 2 hours and test in accordance with 6.1.3.2.
6.1.7 Adapt to power range detection
6.1.7.1 The output frequency of the variable-frequency voltage power supply is set at 47.5Hz, and the voltages are set at 187V and 242V, respectively, and tested according to the requirements of 6.1.3.1.
6.1.7.2 The output frequency of the variable frequency voltage power supply is set at 52.5Hz, and the voltages are set at 187V and 242V, respectively, and tested according to the requirements of 6.1.3.1.
6.1.8 Continuous working time detection
The output frequency of the variable frequency voltage power supply is set at 50Hz, and the voltage is set at 220V, and a test is performed every 30 minutes in accordance with the requirements of 6.1.3.2.
6.1.9 Electromagnetic compatibility
6.1.9.1 Electrical fast transient burst anti-interference
The electrical fast transient burst immunity test conforms to the corresponding clauses of GB / T 17626.4-2008, and is tested in accordance with the requirements of 6.1.3.2.
6.1.9.2 Surge (shock) immunity
The surge (shock) immunity test conforms to the corresponding clauses of GB / T 17626.5--2008, and is tested in accordance with the requirements of 6.1.3.2.
6.1.9.3 Immunity to voltage sags and short-term interruptions
The voltage sag and short-term interruption immunity test conforms to the corresponding provisions of GB / T 17626.11--2008, and is tested in accordance with the requirements of 6.1.3.2.
6.1.10 Conveyor speed
Test with tachometer.
6.2 Insulation resistance
Test with megohmmeter.
6.3 Electric strength
Use a dielectric strength test device with a capacity of not less than 0.5kVA. The test should start at half the value of the test voltage and gradually
Raise to 1500V for 1min.
6.4 Ground resistance
Connect both ends of the AC power supply with no-load voltage not greater than 12V and output current of 10A between the measuring ground terminal or ground contact and the accessible metal, and measure the voltage drop between the two. resistance.
6.5 Degree of protection
Dustproofness shall be tested in accordance with 13.4 of GB 4208-2008.
Waterproofing shall be tested in accordance with 14.2.4 of GB 4208-2008.
6.6 Warning signal and output control signal interface
Externally discharge the equipment and keep it in working condition. Use appropriate standard samples to make the detector emit corresponding warning signals and output control signals. There should be sound warnings and / or light warnings. The discharge equipment should be able to work reliably.
7 inspection rules
7.1 Factory inspection
Each product shall be inspected one by one, and the inspection items shall meet the requirements of Table 9.
Table 9 Inspection items
Serial number
project
skills requirement
Testing method
Factory inspection
Formal inspection
1
Exterior
5.1.1
6.1.4
2
Insulation resistance
5.3.3
6.2
3
Ground resistance
5.3.5
6.4
4
Adapt to power range
5.1.4
6.1.7
5
Continuous working time
5.1.5
6.1.8
6
Electrical fast transient burst
5.1.6.1
6.1.9.1
7
Surge (shock)
5.1.6.2
6.1.9.2
8
Voltage sag, short interruption
5.1.6.3
6.1.9.3
9
Normal working sensitivity (high temperature environment)
5.1.2
6.1.5.1
10
Normal working sensitivity (high temperature storage)
5.1.2
6.1.5.2
11
Normal working sensitivity (low temperature environment)
5.1.2
6.1.5.3
12
Normal working sensitivity (low temperature storage)
5.1.2
6.1.5.4
13
Damp heat environment sensitivity
5.1.3
6.1.6
14
Dielectric strength
5.3.4
6.3
15
Conveyor speed
5.1.7
6.1.10
16
Protection class
5.3.6
6.5
17
Warning signal and output control signal interface
5.1.8
6.6
7.2 Type inspection
7.2.1 Type inspection shall be performed when one of the following conditions is met:
a) When the new product or the old product is transferred to the factory for trial production and customized identification;
b) After the production, if there are major changes in the structure, materials and processes that may affect the performance of the product
c) In normal production, inspection should be carried out at least once a year periodically;
d) when the product is suspended for one year and then resumed;
e) When there is a significant difference between the factory inspection results and the last formal inspection;
f) When a national quality supervision agency requests a type inspection.
7.2.2 The type inspection shall be randomly selected from the products that passed the factory inspection. Type test items are all inspection items of this standard, and the order of left and right inspection should meet the requirements of Table 9.
8 Decision rules
8.1 Factory inspection
If one of the detectors fails in the factory inspection, it is a non-conforming product. It should be returned to the production department for inspection and repair.
8.2 Type inspection
If one item in the type inspection fails, double the sampling and retest. When there is still a pass, the entire batch of products is judged to be unqualified. If the type test fails, the customs clearance and delivery shall be stopped, and the production and delivery may not resume until the next formal test is passed.
9 Marking, packaging, transportation, storage
9.1 Signs and labels
The manufacturer's name or registered trademark, product name, model, implementation standard, manufacturing date and factory number, rated operating voltage, rated power, and rated frequency shall be marked in an easily visible position.
The product should be clearly displayed on the corresponding parts or parts as required: safety warning, adjustment range, range, movement and direction; opening, closing, clutch; material level, liquid level and other signs. When using pneumatic components, it should be at the corresponding component position Mark the rated pressure.
If it needs to be expressed in words, it should be marked in Chinese (except for export products).
9.2 Packaging
All materials used in packaging shall meet the requirements of national packaging materials. The materials shall be non-toxic, non-degradable or release toxic substances.
Measures shall be taken to prevent moisture, pressure, collision, and vibration to ensure that the detector structure and circuit components will not be damaged during normal loading, unloading, transportation and storage.
The packaging mark shall include the name of the product manufacturer, product model, quantity, weight, volume, moisture resistance, anti-vibration, packaging storage and transportation instructions, and the receipt and delivery mark.
9.3 Transport
9.3.1 Product transportation shall meet the requirements of railway, highway, aviation, water transportation and mechanized loading. For products with special requirements, their transportation requirements should be clarified.
9.3.2 The transportation of products shall meet the following requirements:
a) The carriages, cabins and containers of the product shall be kept clean, dry and free of pollutants;
b) It is strictly forbidden to transport the product in the same compartment, cabin, or container with pollutants, toxic and harmful substances, corrosive chemicals and moist materials.
9.4 Storage
The storage environment of the product should be dry and ventilated, and the work of preventing moisture and moisture in the warehouse should be done to ensure that the product is free from rust.
The product should be stored flat and stable, and should not be stacked too high. When it is stacked, it should be raised with a square wood below the product. The height of the height should ensure ventilation and forklift requirements.
The product should not be stored with non-toxic, non-toxic and corrosive items.
When the product is stored in the open air, there should be measures to prevent rain, snow, sun and water.
During the storage of the product, pay attention to the signs on the packaging box for rust and packaging rupture, and take timely measures when the above situation occurs; regularly check the product conditions in the packaging box, and check whether the protective layer has lost the anti-rust effect. The protective layer should be replaced when necessary.
9.5 Random technical documents
Each product should be equipped with the following documents:
a) product certification;
b) instruction manual;
c) packing list;
d) Product warranty.
Appendix A
(Normative appendix)
Standard sample
A.1 Requirements
The technical requirements of the standard sample shall meet the requirements of 5.4 of GB / T308-2002, the shape error and surface roughness grade G200.
A.2 Material
Magnetically permeable DT4C, non-magnetic OCrl8Ni9.
A.3 Diameter (mm)
The following specification sizes are preferred:
0.6, 0.7, 0.8, 1.0, 1.2, 1.5, 2.0, 2.5, 3.0.
Chinese name: Metal Detector
English name: metal detector

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