Have you heard about the glow wire test procedure

What is the glow wire test?

The Glow wire tester ZRS-3H/ZRS-3HS is suitable for providing resistance to abnormal heat and fire tests on the lighting lamps, the electronic products and household appliances.

It uses a high-temperature coating spraying on the steel structure and all the imported instruments display with the easy operation and the stable performance. This equipment is applicable to the flame resistance test.

Introduction to Glow Wire Test

The Glow wire test chamber includes; a spare fuse, weights, metal mesh, power cord, residue collector, a silk paper, exhaust pipe, gauge, remote control. There is also a plastic bag in the package that contains a CD, calibrate certificates, and guarantee cards. There are user manual, operation video and related standards in the CD.

Working

• Open the door of the chamber.
• To avoid damage of equipment in transit, use the cable ties to fix the internal sample car and other ports.
• Remove the cable ties.
• Pass the thin wire of the weights through the notch of the sample car.
• Hang on the two fixed pulleys.
• In case, if you need to test the small sample, fix the metal mesh and fix the sample on the metal mesh.
• The exhaust pipe needs to be installed on the back of the chamber.
• Put the other end of the pipe outside to exhaust the smoke generated during the test.
• Install and fix the sample on the sample car.
• Adjust the screw so that the movable range of the sample car is at least 7mm.
• The limiter for the car sample is provided in the package.
• The limiter can be moved left and right to control the end position of the sample.
• You can also move it to the safe position on the right.
• Connect the power cord to the 220 volts 50 HZ power supply.
• Turn on the switch.
• Press the green button to turn on the device.
• Click the touch screen to enter ‘’WORKING INTERFACE’’.
• There is also a remote control. The four buttons on the remote control have the same functions. The buttons are named as A,B,C and D.
• This is a lighting switch, click to turn on the light in the chamber.
• The switch for the exhaust fan is also present along with an emergency stop button.
• Click on ‘’LEFT RUN’’.
• The sample car starts to drive to the left to the limiter position. The sample car stops and the limiter indicator light gets on.
• The correct position that the sample car needs to stop should be that the glow wire touches the sample.
• The glow wire pushes the sample car 7mm backward.
• It is necessary to fine tune the position of the limiter to make the sample car stop at the correct position.
• Click on ‘’RESET’’.
• Repeat this operation until the sample car can stop at the correct position.
• Click on ‘’RESET’’ after the adjustment.
• It is important to note here that if you test different samples later, you need to confirm whether the limiter of the sample needs to be readjusted.
• Now, place the silk paper on the residue collector. Place the residue collector under the glow wire. Close the door of the chamber.
• Click to enter the ‘’Parameter set’’ interface.
• Set ‘’Glow wire time’’, ‘’Ignition time’’ and ‘’Flameout time’’ according to the standard. Generally, they are 30 seconds, 30 seconds and 60 seconds.
• After setting, return to the ‘’WORKING INTERFACE’’ and ‘’CLICK’’ on ‘’HEAT’’.
• Turn the current adjustment button clockwise.
• In order to extend the service time of the equipment, you have to adjust the current slowly. However, depending on the different ambient temperature and glow wire status, the required current needs to be fine-tuned.
• The real time temperature of the glow wire can be seen on the screen.
• After the glow wire temperature reaches the standard value, and the temperature is stable.
• Click on ‘’LEFT RUN’’ to start the test. After 30 seconds, the sample car will be evacuated.
• Click on ‘’TE Pause’’ to record the ‘’Flame out time’’, when the flame on the simple goes out.
• If there is no fire, you do not need to click these two buttons. The Ignition time and flame out time will finish automatically.
• The ‘’Heat button’’ will automatically pop up after the glow wire test. The glow wire will stop heating, and the temperature will automatically drop.
• Turn on the fan to exhaust the smoke in the chamber. If you don’t need to do more tests, please turn the current button back to 0. Turn off the equipment.

Maintenance

The glow wire is heated by the high current to gain a high temperature. If the power supply voltage of the equipment is unstable, the heating current will also be unstable. Therefore, it is better to use a regulated power supply to power the equipment.

Set the test time according to the standards. Do not keep the glow wire at a high temperature for a very long time. This will shorten the life of the glow wire and thermocouple. It needs to be cleaned if there is attachment on the glow wire after the test.

Specifications

• Heating temperature: adjustable continuously within the range of ≤500-1000°C, the accuracy of temperature is 1°C, the resolution of temperature is ±3°C
• Glowing time: 0.1-999.9s，±0.1S(time range is adjustable)
• Burning time: 0.1-999.9s, auto record, manual pause
• Flame chilling time: 0.1-999.9s (auto record and manual pause)
• Glow wire pressure on test specimen: 1±0.2N. Limiting pressure depth is 7mm
• Glow wire: φ4 nickel (80％) and chromium (20％) Made in specific dimensions.
• Thermoelectric couple: φ0.5 armored nickel & chromium/nickel-chromium wire, K degree.
• Auto break away: While reaching specified glowing time, test specimens will break away from glow wire automatically.

 

Frequently Asked Questions

What is Glow Wire Capable?

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

What is glow wire ignition temperature?

The glow wire ignition temperature is the temperature that is 25 °C higher (30°C higher if between 900°C and 960°C) than the highest temperature measured at the end of the glow wire. Glow Wire test is used to determine the flammability of end products.

Tags：ZRS-3H