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All technical contents of this standard are compulsory.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 12899-2003 General specifications for hand-held metal detector. The following main technical changes have been made with respect to GB 2899-2003:
——The normative references are modified (see Clause 2; Clause 2 of Edition 2003);
——The definition of "detector sensor" is added (see 3.5);
——The definition of "detector axis" is added (see 3.6);
——The definition of "detector base plane" is modified (see 3.7; 3.6 of Edition 2003);
——"measurement plane" is changed into "detection plane" and its definition is also modified (see 3.8; 3.5 of Edition 2003);
——The definition of "detection separation distance" is modified (see 3.9; 3.7 of Edition 2003);
——"test mode" is changed into "detection mode" and its definition is also changed (see 3.10; 3.8 of Edition 2003);
——"detection classes" is changed to "detection class" and its definition is also changed (see 3.11; 3.9 of Edition 2003);
——The definition of "test object" is added (see 3.12);
——The definition of "auto-test system" is added (see 3.13);
——The technical requirements have been greatly adjusted and refined, with special emphasis on the simulation of basic function test (see Clause 4, Clause 4 of Edition 2003);
——The detection separation distance requirements for test objects T2 and T3 are added (see Table 1);
——The identifications are moved to Clause 7 (see 7.1; 4.4 of Edition 2003);
——Medium alarm test object T2 and large alarm test object T3 are added (see Annex A);
——The schematic diagram of auto-test system is added (see Annex C);
——The reference level and equation derivation of radiation magnetic induction strength are added (see Annex D).
This standard was proposed by and is under the jurisdiction of the Ministry of Public Security of the People's Republic of China.
The previous editions of this standard are as follows:
——GB 12899-1991 and GB 12899-2003.
General specifications for hand-held metal detector
1 Scope
This standard specifies the technical requirements, test methods, inspection rules, identification, marking, labeling, packaging, accompanied technical documents, etc. of hand-held metal detectors.
It is applicable to hand-held metal detectors for checking metal weapons and metal contraband articles, and is the basic basis for designing, manufacturing, inspecting and using such equipment. It may apply by reference for hand-held metal detectors for other purposes.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2423.1-2008 Environmental testing - Part 2: Test methods - Tests A: Cold
GB/T 24232-2008 Environmental testing - Part 2: Test methods - Tests B: Dry heat
GB/T 2423.3-2016 Environmental testing - Part 2: Testing method - Test Cab: Damp heat, steady state
GB/T 2423.5-1995 Environmental testing for electric and electronic products - Part 2: Test methods - Test Ea and guidance: Shock
GB/T 2423.8-1995 Environmental testing for electric and electronic products - Part 2: Test methods test Ed: Free fall
GB/T 2423.10-2008 Environmental testing for electric and electronic products - Part 2: Test methods - Test Fc: Vibration (Sinusoidal)
GB/T 4208-2017 Degrees of protection provided by enclosure (IP code)
GB 4793.1-2007 Safety requirements for electrical equipment for measurement, control and laboratory use - Part 1: General requirements
GB/T 6587-2012 General specification for electronic measuring instruments
GB/T 17626.2-2006 Electromagnetic compatibility (EMC) - Testing and measurement techniques - Electrostatic discharge immunity test
GB/T 17626.3-2016 Electromagnetic compatibility - Testing and measurement techniques - Radiated radio-frequency electromagnetic field immunity test
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
hand-held metal detector
a kind of hand-held metal detecting device, which can detect hidden metal objects exceeding a limited amount
3.2
positive alarm
in case of metal objects reaching or exceeding the limited amount are detected, the hand-held metal detector sending out alarm signals with specified display and sound
3.3
alarm failure
situation of hand-held metal detectors failing to giving positive alarm for metal objects that reach or exceed the limited amount
3.4
false alarm
situation of hand-held metal detector giving false alarm in case of no detection conducted or no article that shall be alarmed
3.5
detector sensor
sensor of hand-held metal detector to detect metal
3.6
detector axis
imaginary axis that passes through and is perpendicular to the center of the detection area of detector sensor (generally referring to the center of the overall dimension of the detector sensor when there is no specification by the product), such as Z-axis in Figure 1
3.7
detector base plane
plane located on the detector sensor surface of the hand-held metal detector and closest to the test object in normal use, such as the one including X-axis and Y-axis in In Figure 1
Figure 1 Schematic diagram of detector base plane and detector axis
3.8
measurement plane; detection plane
a series of imaginary two-dimensional planes located above and parallel to the detector base plane when a hand-held metal detector is used to detect a to-be-detected object
3.9
detection separation distance
distance between detection plane and detector base plane
3.10
detection mode
which is divided into approaching mode and skimming mode according to whether the hand-held metal detector approaches the test object along the Z-axis or skims near the test object along the direction parallel to the X-axis or Y-axis, as shown in Figure 2
Figure 2 Schematic diagram of detection plane, detection separation distance
and detection mode
3.11
detection class
detection capability of hand-held metal detector to metal objects with certain dimension and electromagnetic characteristics, which is divided into three classes: A, B and C according to the detection separation distance
Note: The detection separation distance of Class A is far, that of Class B is moderate, and that of Class C is close.
3.12
test object
special metal objects used to inspect the performance of hand-held metal detectors and evaluate the detection class, which are divided into small alarm one, medium alarm one and large alarm one
3.13
auto-test system
automatic detecting equipment used to simulate the process of test object detection by the tester using hand-held metal detector, which may hold test object and hand-held metal detector, and translate the test object or the hand-held metal detector in X-, Y- and Z-axis coordinate system
4 Technical requirements
4.1 Appearance
The surface of the hand-held metal detector (hereinafter referred to as the "detector") shall be smooth and clean, and be free from cracking, blistering, coating falling off, sharp corners, sharp edges, flash burrs, obvious scratches, etc.
4.2 Mechanical structure
4.2.1 Enclosure strength
The detector shall have sufficient mechanical strength, and shall be free from loosening, dislocation, crack or distortion, etc. in normal use.
4.2.2 Degree of protection provided by enclosure
The degree of protection provided by enclosure shall meet the relevant technical requirements of GB/T 4208-2017, IP31.
4.23 Battery placement
The placement of detector battery shall meet the following requirements;
a) built-in and designed for easy replacement or charging;
b) effective isolation between the detector circuit and the battery compartment.
4.2.4 Mass of complete machine
The mass of complete machine for detector shall be less than or equal to 800g (including the battery).
4.3 Operation and control devices
Keys, switches, signal sockets, etc. shall be operated flexibly, with clear hand feeling and reliable functions.
4.4 Power supply
The power supply of the detector shall meet the following requirements:
a) supplying power with batteries of common model, and the supply voltage less than or equal to 15V;
b) able to work continuously and stably for at least 24h without replacing batteries or recharging;
c) having under-voltage indication function.
4.5 Basic detection function
The detector shall be able to alarm in case of the metal reaching or exceeding the limited amount, and no alarm failure shall occur.
4.6 Detection performance
4.6.1 Range of detection sensitivity
The detector shall be applicable to or cover at least one detection class.
4.6.2 Detection sensitivity
There shall be a set of recommended setting parameters or shortcut programs for the detection class that can be met as stated in the product user manual. When judging whether the product can meet a detection class, it shall be tested according to all the test objects and requirements of the corresponding detection categories listed in Table 1, and no alarm failure shall occur. See Annex A for code and dimension of test object; see Annex B for the posture during test.
Table 1 Detection sensitivity requirements of different detection classes
Detection class Test object and corresponding detection separation distance Posture Detection mode
T1 T2 T3
A 5.5cm±0.25cm 6.0cm±0.25cm 9.5cm±0.25cm Transverse Skimming, approaching
B 4.0cm±0.25cm 5.0cm±0.25cm 8.0cm±0.25cm Transverse Skimming, approaching
C 2.5cm±0.25cm 4.0cm±0.25cm 6.5cm±0.25cm Transverse Skimming, approaching
4.6.3 Movement speed
The movement speed of the detector shall be at least 0.4m/s~2.0m/s. According to the detection class, the test shall be carried out according to the requirements of Table 2, and no alarm failure shall occur. See Annex A for code and dimension of test object; see Annex B for the posture during test.
Table 2 Movement speed requirements of different detection classes
Detection class Movement speed Test object and corresponding detection separation distance Posture Detection mode
T1 T2 T3
A 0.4m/s, 2.0m/s 5.5cm±0.25cm 6.0cm±0.25cm 9.0cm±0.25cm Transverse Skimming, approaching
B 0.4m/s, 2.0m/s 3.5cm±0.25cm 5.0cm±0.25cm 7.5cm±0.25cm Transverse Skimming, approaching
C 0.4m/s, 2.0m/s 2.0cm±0.25cm 4.0cm±0.25cm 6.0cm±0.25cm Transverse Skimming, approaching
4.7 Alarm indication
4.7.1 Alarm sound
The maximum alarm sound intensity 0.8m away from the detector shall be greater than or equal to 75dB(A). The alarm sound shall be different from the sound prompting other information.
4.7.2 Alarm display
It shall be in red and clearly seen in the 10,000lx bright environment and 25lx dim environment and different from the non-alarm display.
4.7.3 Headphone jack
If the detector has headphone jack, the sound alarm indication shall be automatically turned off when the headphone is inserted into the headphone jack.
4.7.4 Alarm state resumption
The alarm indication shall stop immediately after the detector leaves from the alarmed test object for a specified distance.
4.8 Radiation magnetic induction strength
The magnetic field induced by the detector shall have radiation magnetic induction strength of no more than 20μT at any point on its surface. See Annex D for the formulation of indexes.
4.9 Resistance to mutual interference
When multiple detectors are used at an interval of 0.6m, each shall be able to work normally.
4.10 Resistance to the influence of surrounding metal objects
The performance of the detector’s resistance to the influence of surrounding metal objects meets the following technical requirements:
a) when the detector moves at a distance greater than or equal to 0.5m from large metal objects, no alarm signal shall occur;
b) detectors close to large metal objects shall be able to automatically resume their detection performance within 1min after leaving the large metal objects.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Test methods
6 Inspection rules
7 Identification, marking, labeling and packaging
8 Accompanied technical documents
Annex A (Informative) Code, material and overall dimension of test object
Annex B (Informative) Movement postures of test object
Annex C (Informative) Auto-test system
Annex D (Informative) Radiation magnetic induction strength
