Operation steps of glow wire testing machine:
1. Turn on the power switch of the combustion box. Keep the sample holder a certain distance away from the glow wire. (Press the reset button)
2. Reset the three timers, set the burning time according to the standard requirements, and let the buttons under the timer for the light-off time and flame extinguish time pop up.
3. Press the heating button to connect the current, and adjust the "current adjustment" knob on the heating power clockwise. The relationship between the glow wire temperature and the current (reference value) is roughly as follows:
550 ℃ 650 ℃ 750 ℃ ​​850 ℃ 960 ℃
60A 85A 100A 115A 130A
The glowing wire can be seen to have a redness temperature of about 650 ° C. After the current is roughly adjusted, the temperature must reach a certain lag time (2 minutes) to achieve stability. You can refer to the display value of the temperature table for further fine-tuning.
4. After the temperature stabilizes, press the "left row" button and the cart will move forward. When the sample is in contact with the glow wire, the carriage will stop to the right, and the instrument will automatically time. When the preset glow time expires, the sample holder will automatically retreat. When the sample has flame during the test, press "Ti to pause" "Button, when the flame is extinguished, you should press the" Te Pause "button. If you want to stop the test halfway, you can press the" Reset "button, and the sample holder will also automatically detach from the glow wire.
Cautions for glow wire testing machine:
1. The user of this device must stabilize the power supply, otherwise the temperature will change due to excessive voltage fluctuation.
2. The thermocouple is only used for test calibration temperature. After calibration, mark the ammeter for the next test. After the temperature drops to normal temperature, the thermocouple should be carefully pulled out from the glow wire and then start do experiments.
3. The glow wire should not work for a long time under high temperature, so as not to shorten the service life of the thermocouple, the current should be reduced in time after each use, and the power supply should be cut off.
4. After each test, the combustion chamber should be cleaned with power off, and be careful not to hit the thermocouple and glow wire.
5. After the test is completed, the user can use the exhaust fan to exhaust the exhaust gas generated during combustion, but do not turn on the fan during the test, so as not to affect the test results.
6. If maintenance is needed, especially the replacement of the glow wire, pay attention to re-tighten the screw that has been turned, otherwise the current loop and interface high temperature will be affected due to poor contact. After replacing parts, users should tighten all screws.
7. The machine has over-temperature protection function. When the set temperature is reached, the heating circuit will be automatically disconnected. Therefore, the preset temperature cannot be lower than the normal operating temperature, otherwise it will not work properly.
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