Operation steps of Lanzhou box type resistance furnace (medium temperature test)：

1. Do not exceed the high temperature of this resistance furnace during use.

When installing the sample, be sure to cut off the power supply to prevent electric shock.

When loading and unloading samples, the furnace door should be opened for as short a time as possible to extend the service life of the electric furnace.

4. It is prohibited to pour any liquid into the furnace.

5. Do not put samples contaminated with water and oil into the furnace; Do not use clamps dipped in water and oil to collect samples.

6. Wear gloves when collecting samples to prevent burns.

7. The sample should be placed in the middle of the furnace, neatly arranged, and not randomly placed.

8. Do not touch the electric furnace and surrounding samples casually.

After use, the power and water sources should be cut off.

10. Without the permission of the management personnel, it is not allowed to operate the resistance furnace. Strictly follow the operating procedures of the equipment.

Precautions for ash content testing:

1. After the sample is preliminarily burned, it is taken out and cooled. A small amount of deionized water can be slowly added from the edge of the crucible (do not directly pour it on the residual ash to prevent it from flying) to dissolve the water-soluble salts. The carbon particles wrapped in it are exposed, evaporated on a water bath, and placed at 120-130 ℃

Fully dry in the oven (remove moisture to prevent residual ash from scattering due to heating during ashing), and then burn to a constant weight.

When placing or removing the crucible from the muffle furnace, it should be left at the furnace mouth for a moment to preheat or cool the crucible and prevent it from breaking due to temperature fluctuations.

3. When clamping the crucible, preheat it briefly on an electric furnace or muffle furnace.

4. After burning, the crucible should be cooled to below 200 ℃ before being transferred into a dryer. Otherwise, due to the convective effect of heat, residual ash may scatter, and the cooling rate is slow. After cooling, a large vacuum is formed inside the dryer, and the lid is not easy to open.

5. After placing the crucible into the dryer, first cover it with a lid, then slowly push open the lid to release the air. Repeat this several times, cover the lid tightly and cool to room temperature.

When taking out the crucible from the dryer, due to the vacuum inside, when opening the lid to restore normal pressure, it should be lightly moved to allow air to slowly flow in to prevent residual ash from scattering.

Specification parameters:

Furnace specifications:

Lanzhou box type resistance furnace (medium temperature test)Special furnace dimensions can be customized according to customer requirements!

Reasons and solutions for temperature control faults in ceramic muffle furnaces

Temperature shows equilibrium solid

reason:

1. Poor contact of thermocouple grid;

2. Thermocouples have intermittent short circuits or road trips;

3. Thermocouples have intermittent grounding;

4. The status of thermocouples has been constantly changing;

5. Compensate for grounding, intermittent short circuit or road robbery of the wire;

6. Temperature display measuring tool malfunction;

Solution:

1. Reconnect the thermocouple;

2. Review thermocouples to eliminate fault points or replace them;

3. Eliminate contact points;

4. Flow good thermocouples;

5. Review and repair wires to eliminate fault points;

6. Repair or replace the temperature display meter;