Shenzhen Electronic Testing Laboratory Technology Co., Ltd. China Testing ▪ To the world
China's first batch of comprehensive authoritative third-party testing and certification agencies

The instructions for the inspection of safety and explosion-proof products are
based on the standard:
GB3836.1-2010 "Explosive environment Part 1: General requirements for equipment"
GB3836.4-2010 "Explosive environment Part 4: Equipment protected by intrinsically safe" i ""

1 Product standard or technical condition (product enterprise standard with file number attached)
(Note: The maximum input parameters should be indicated in the electrical parameters: Ui, Ii, Ci, Li, Pi, transmit power, etc.)

2 Product instruction manual
Note: 1) Product maximum input parameters: Ui, Ii, Ci, Li, Pi, etc.
2) Intrinsically safe products should have a wiring diagram and installation area with the safety barrier and indicate the safety barrier model or explosion-proof parameters: Um, Uo, Io, Co, Lo, Po
3) Battery-powered products should have relevant precautions and warnings. 4 Precautions and warnings for the antistatic of the shell of insulating material.

3 The explosion-proof design book
briefly describes the working principle of the circuit, mainly explaining which explosion-proof measures are taken to limit the circuit energy to meet the requirements of intrinsic safety explosion-proof.

4 Main product drawings: (All drawings need to add a title bar-including drawing name / drawing number / signature / date / change date / version number, etc.)
4.1 General assembly drawing:
4.1.1 including product composition / outline structure / material The total content of ia grade aluminum, magnesium, titanium and zirconium in mass percentage should not exceed 10%)
Plastic material description surface area size and surface insulation resistance <1GΩ) / size / nameplate position / cable model specification and length / grounding situation, etc.
4.1.2 For series products, the differences between the various models and the impact on the explosion-proof performance should be described in detail and relevant drawings should be attached.
4.1.3 If the composite product contains other explosion-proof types, the corresponding drawings shall be attached.
If there are certified explosion-proof parts in the system, the model name / explosion-proof mark and explosion-proof certificate number shall be marked, and a copy of the explosion-proof certificate number shall be attached.
4.1.4 The diagram should explain the product implementation standards / division of safe and non-safe areas.

4.2 Circuit wiring block diagram:
The wiring terminals and plug-in code of each circuit board should be marked, and the direction of external connection should be explained.

4.3 Circuit schematic diagram:
The protection circuit related to intrinsic safety should be clearly indicated by the dotted frame, and indicate whether it is encapsulated, and it is not allowed to change without the approval of the certification body.

4.4 Printed circuit board drawing: the
printed board thickness / printed wire thickness / printed wire width / board line spacing (corresponding to the minimum spacing of different voltages) must be marked; the line length of the
internal conductor / intrinsically safe terminals, and Ground spacing / distance between intrinsically safe and non-intrinsically safe terminals, and ground;
the value of the tracking index CTI of insulating materials (not required for U <10V). For example: the printed circuit board material is epoxy glass cloth board: CTI≥175.

4.5 Component layout diagram:
indicate the materials, processes and application times of insulating varnish after installation and debugging.

4.6 Component Material Table:
Code / Name / Model Specification / Thermal Resistance (K / W) / Quantity / Remarks (The rated value of components related to intrinsic safety should indicate the error, key parts should indicate the manufacturer, battery and battery pack Indicate the model and battery structure, such as sealed or valve-controlled structure).

4.7 Transformer and inductance coil diagram:
(8.1.3) Transformer structure / impregnation or potting / heat-resistant grade (GB / T11021) /
(8.1.4) Intrinsically safe winding and other windings withstand voltage grade / electricity after installation Gap / coil turns / wire diameter / insulation material / size / / inductance and DC minimum resistance and other manufacturing processes.

4.8 Package drawing (for example: safety barrier, battery, etc.):
indicate the encapsulated circuit, encapsulant model, manufacturer, encapsulant temperature, mixing and encapsulation thickness (> 1mm) and packaging process.

4.9 Nameplate drawing:
mainly including model name / explosion-proof mark / explosion-proof certificate number / ambient temperature / product number or production date / manufacturer, etc., and indicate the nameplate size, material, thickness and fixing method. (Add warnings as needed, for example: charging in hazardous locations is strictly forbidden!)

5 Prototypes for inspection (special tools for opening prototypes are provided)
5.1 In the same certification unit, select products with representative circuits and mechanical structures for sample delivery. When the product model and specification range is large, multiple models and specifications can be selected for sample delivery inspection.
5.2 The number of samples submitted should meet the requirements stipulated by the type inspection standards. In general, the sample volume of the whole product is one piece.
5.3 The samples submitted for inspection should be able to be opened to check the consistency of their circuits and drawings. For encapsulated devices, samples that are encapsulated and not encapsulated are required.
5.4 The safety barrier needs to send encapsulated and unencapsulated samples, and 10 different types of fuse and Zener diode in the safety barrier.
5.5 Battery components
5.5.1 10 groups of battery components shall be submitted for inspection.
5.5.2 Specifications and inspection reports of battery manufacturers, including battery structure, battery short-circuit temperature, short-circuit without explosion, electrolyte leakage, etc.
5.5.3 All drawings and parameters of battery protection circuits that meet explosion-proof requirements shall be provided.
5.6 Because the vortex flowmeter is used for "impact test with piezoelectric device", large-diameter samples should be sent for inspection.

6 The above information is in duplicate (each unit must be stamped with the official seal of the unit);
additional
copies of each of the following materials are attached: 6.1 Copy of the company ’s business license
6.2 Quality assurance statement
6.3 Product type inspection report
6.4 Transmission power inspection report (marked in the enterprise standard) Product maximum transmit power)