What is the needle flame test method of the needle flame test equipment

The needle flame test equipment is suitable for testing the flame retardant performance of electronic components, electrical components, mechanical components, injection molded parts, and other electrical products. This machine simulates the small flames generated inside the product under fault conditions, and evaluates the fire hazard using simulation technology.

Experimental principle of needle flame test equipment:
The needle flame test is to test the specified size（ Φ A needle shaped burner with a diameter of 0.9mm is used to ignite the sample with a specific gas (butane) at a fixed angle of 45 º. The sample is observed for ignition, duration, and combustion length to assess the fire risk of small flames caused by equipment failure conditions.

Test purpose:
Needle flame test is used to test whether the flame will not ignite the component under specified conditions, or if the test flame causes a combustible component, but the combustion duration or length of the component is limited, and the flame or burning or hot particles falling from the sample will not cause combustion to spread.
The flame applied to the sample simulates the flames that may be generated from components near the sample in practical applications, such as those generated due to electrical faults.
If applicable, the relevant product specifications should specify the duration and acceptance criteria for applying the test flame.

The structural characteristics of the needle flame combustion tester:
Steel structure chamber, with a test chamber volume greater than 0.75 cubic meters, providing sufficient clean air for the test.

Large observation window, painted with a dark color on the inner wall of the box, with an illumination of less than 20Lux, making it easy to observe the combustion status of the sample.
Install a smoke exhaust device on the top, which can automatically start and exhaust the test exhaust gas after the test is completed.
Introducing industrial design concepts into structure, appearance, and interface design, integrating panel structure, easy to operate, user-friendly interface, in line with ergonomics and operating habits, with a beautiful and elegant appearance
Brass made burner has good thermal stability and low deformation at high temperatures. The nozzle has an aperture of 0.5 ± 0.1mm, an outer diameter of 0.9mm, and a length of 35mm, which meets the standard requirements. It is equipped with a protective device to prevent accidental damage.
The burner angle can be easily adjusted from 0 to 45 degrees, meeting the position requirements for sample exposure to fire and temperature correction

• High voltage pulse automatic ignition, stable and reliable ignition, high safety
• Equipped with stainless steel fixtures for durability; The sample fixture can achieve smooth movement and precise positioning in both horizontal and vertical directions through a sliding rail structure.
• Equipped with imported precision rotor flowmeter to control gas flow, and equipped with imported differential pressure measurement to measure burner back pressure.
• Equipped with brand pressure gauges and pressure regulating valves to regulate gas pressure, equipped with solenoid valves to control gas on and off, ensuring the safety of equipment use.
• Programmable logic controller (PLC)+touch screen control, which can achieve automatic control/detection/calculation/data storage
• The test time and fire exposure time can be set by oneself, and the software automatically timing
• Linear combustion rate (V) PLC calculation, data touch screen display and storage
• Equipped with a reminder function for the arrival of flame impact time and a 10 minute automatic shut-off function without experimentation, ensuring safe use.
• Optional temperature correction package, imported brand thermocouple measurement accuracy ± 0.1 ℃, can automatically generate correction curves and make judgments.

The needle flame test method:
1. Turn on the power switch of the combustion chamber and set the test time and observation time to 30 seconds.
2. Open the combustion test door. Turn the gas switch back to the “OFF” position and confirm that the cylinder button is in the “disengaged” position. Due to special safety design, if the gas switch is not turned to the “OFF” position, the gas cylinder will not be able to be loaded into the furnace body.
3. When placing gas cylinders, the gap of the cylinder valve must be facing upwards. It is necessary to pay attention to the connection between the gap of the gas cylinder valve and the protruding part of the pressure sensing safety device of the portable furnace.
4. Press the gas button to the “SET” position. If the gas cylinder is installed incorrectly, it can cause butane gas to leak and emit a “sizzling” sound. When installing gas cylinders, it is necessary to check them clearly and make no noise.
5. Press the flame adjustment button on the control panel, and the device will open the solenoid valve and automatically ignite. If the burner does not catch fire, immediately click the stop button, and adjust the gas flow meter appropriately. Press the flame adjustment button again. The accessories are equipped with duckbill gauges, and other measuring tools (such as Vernier scale) can also be used to adjust the gas flowmeter again to stabilize the flame height at 12 ± 1mm; The flame temperature increased from 100 ℃± 5 ℃ to 700 ℃± 3 ℃, and the test time was 23.5 ± 1.0 seconds.
6. Press the debugging button, and the burner car will stop at the right limit position. Adjust the burner to form a 45 ° angle with the horizontal plane, adjust the burner and fixture to make the distance between the burner and the bottom surface of the sample 8mm or 5mm from the side. Turn the left or right up/down self reset switch to adjust the test sample carrier that has already been clamped on the right to the standard position.
7. Wrap a layer of silk paper tightly on a smooth white pine board with a thickness of about 10mm and place it 200 ± 5mm below the position of the test sample where the needle flame is applied.
8. After the flame temperature reaches, activate the test switch to observe the test sample, the parts around the test sample, and the underlying layer, and record the combustion duration (t) from the moment the test flame moves away until the flame extinguishes, or until the test sample, the parts near it, or the underlying layer used for the test is no longer scorching.
9. Press the reset button, and the burner trolley will return to the initial position on the left.

Evaluation of test results of needle flame test equipment:
The needle flame test is evaluated based on the requirements of the product standard. If there are no requirements in the product standard, meeting one of the following requirements is considered qualified:
1) The test sample does not produce flames or scorching phenomena, and the packaging paper does not ignite or the white pine board does not carbonize.
2) After removing the needle flame, the flame or scorching duration of the test sample, surrounding parts, and bedding layer is less than 30 seconds. The parts and bedding layer around the test sample will no longer continue to burn, the packaging paper will not ignite, and the white pine board will not carbonize.

According to IEC60695-2-2, IEC60695-11-5 and GB/T-5169.5, ZY-3/ZY-3S needle flame test equipment is applied in the production and quality control department of lighting products, hyperpiesia electrical apparatus, domestic appliance, machine electric appliance, electrical machine, power tool, electronic instrument, electrician instrument and technical equipment. Also, the apparatus is fit for the industry of insulation material, engineering plastics and solid combustible material.

Needle Flame Test ZY-3