Interpretation of the components of the glow wire tester

The glow-wire tester uses simulation technology to evaluate the fire hazard caused by heat sources such as glowing components or overload resistors in a short time due to thermal stress.
It is one of the series of electrical and electronic components fire hazard test instruments
.

It is suitable for evaluating the flammability test and ignition temperature test of electrical equipment and its components and parts, as well as solid electrical insulating materials or other solid flammable materials.
It is a test equipment independently developed and produced by Shanghai Qianshi Precision Electromechanical Technology Co.
, Ltd.
High, complete after-sales service
.

Components: Exhaust fan: After the experiment, the polluted air is exhausted through the exhaust fan
.

Voltage regulator: By adjusting the knob of the voltage regulator, the voltage supplied to both ends of the glow wire is changed, so as to realize the adjustment of the temperature of the glow wire
.

a.
Glow wire: nominal diameter: 4mm; material: nickel/chromium (80/20) wire; heated with a simple circuit, there should be no feedback device or feedback loop to maintain the temperature
.

The typical current required to heat the tip to 960°C is between 120A-150A
.

b.
Temperature Measurement - Filament Thermocouples: Class I mineral insulated metal armored filament thermocouples with insulated nodes
.

The nominal diameter should be 1.
0mm or 0.
5mm
.

For example: Nickel-chromium and nickel-aluminum (type K) wires are suitable for continuous operation at temperatures as high as 960°C, and their welding points are located in the armor, as close to the top as possible
.

The armor shall be made of metal and shall withstand continuous operation at a temperature of at least 1050°C
.

Armoured jackets made of nickel-based heat-resistant alloys are considered to meet the above requirements
.

　　c.
Sample-carrying trolley: adjustable support module, suitable for various standard and non-standard finished products
.

　　d.
Weight: 0.
5N on one side, to ensure that the pressure exerted by the glow wire on the sample during the test is 1.
0N
.

　　e.
Two proximity switches: one is used to detect the starting position of the trolley, and the trolley will stop immediately after running
.

A reminder for shifting, when the trolley passes this position, it will decelerate and the speed will drop from 10mm/s-25mm/s to close to 0
.

　　f.
Block: The block is placed on the screw rod to push the trolley and prevent the trolley from moving
.

The notch at the bottom of the cart allows 7mm of allowable space after inserting the stopper
.

When the glow wire touches the sample, the trolley is no longer pushed by the lead screw, and the trolley can still continue to move up to 7mm under the tension of the weight if the glow wire passes through the sample less
.

　　g.
To assess the spread of fire that may occur, such as that caused by burning or glowing particles falling from the test sample, place a specified subbing layer under the test sample
.

Unless otherwise specified, wrap a layer of wrapping tissue paper on the upper surface of a smooth wooden board with a thickness of 10 mm and place it 200 ± 5 mm below the point where the glow wire is applied to the test sample
.

Silk paper is soft and strong lightweight wrapping paper, the mass per unit area is 12g/m2—30g/m2
.

　　h.
Flame height gauge: The flame height gauge is located just behind the contact between the sample and the glow wire
.

　　i.
Box requirements: a test box with a volume of at least 0.
5m2 that can observe the state of the sample
.

The volume of the test chamber ensures that oxygen loss during the test does not significantly affect the test results
.

The test samples are mounted at least 100mm from each surface of the test chamber
.