What are the common faults of calorimeters and their causes?

I just bought the calorimeter of Henan ** Xinke, they told me about some common faults and causes of the calorimeter, I hope it can help you, their company's service is very thoughtful, the recommended instrument is very practical, buy their XKRL-5000 microcomputer control calorimeter, with very accurate.

1.Bomb leakage.

Causes: Aging or wear of rubber seals; Treatment: Replace the seal.

2.Ignition failed.

Reason 1The line is not passable or the contact is poor; Treatment: Check whether the connection is well connected, whether the oxygen warhead is in good contact with the ignition cap, and whether the inner cylinder of the oxygen bomb is placed.

Reason 2The specimen is wet, and the oxygenation is too fast to splash the specimen.

Reason 3Ignition wire or cotton thread is in poor contact with the specimen, treatment: reloading.

Reason 4If the two electrodes are too dirty, treatment: polish the electrodes with sandpaper.

Reason 5Ignition cap oxidation, treatment: sanding the ignition cap oxide with sandpaper.

Reason 6The two electrodes are short-circuited with the crucible (it is easy to burn the crucible and electrode at this time), treatment: replace the electrode or reload the crucible.

3.Incomplete specimen burning.

Reason: the sample is not flammable, the oxygen is not sufficient or the oxygen pressure is insufficient, treatment: wrap the sample with mirror paper to extend the oxygenation time, and replace the oxygen cylinder.

4.After ignition, the humidity rises too high and the calorific value is too high.

Reason 1The agitator does not rotate, and the processing is that the stirring shaft is stuck and the line is not passable.

Reason 2The stirring blade falls off, and the treatment is as follows: Insert a cotton thread into the nylon rod hole connected to the stirring shaft and re-insert it.

5.The trial does not end for a long time.

The reason is that the ambient temperature is too high, treatment: adjust the water temperature of the outer cylinder to be basically the same as the room temperature, or reduce the indoor temperature.

6.Air leakage during oxygenation.

Cause: Aging or wear of the seal during oxygenation, treatment: replace the seal.

Calorimetry|Automatic Calorimeter|Microcomputer automatic calorimeter|Calorific value calorific detector and other experiments commonly used ignition principles and methods:

There are two common ignition methods for calorimeters: the first is a thin metal wire with a known calorific value indirectly from the two electrodes in the oxygen bomb, and the wire is fused and ignited after the electricity is applied.

The second is a section of molybdenum-chromium wire with a diameter of about millimeters on the electrode indirectly, the middle of the wire is wound into a spiral with a diameter of about 2 millimeters, for 3 5 turns, a section of cotton thread is lapped on the spiral, and the cotton thread is in contact with the sample through a hole with a diameter of 1 2 mm in the center of the fire shield, and when there is an electric current passing through, the molybdenum chromium wire is burned into red heat, igniting the cotton thread and the sample.

So why is it easy to fail in experimental ignition?

1. If it only appears once, it is generally that the ignition wire is not installed, if the ignition failure of multiple samples in continuous experiments, you can first check whether the ignition wire is burned out, and the ignition wire is not burned;

Then you should pay attention to the following issues:

a. Whether the crucible frame inside the oxygen bomb is short-circuited.

b. Whether the ignition electrode is in good contact with the oxygen bomb, such as the ignition claw is too open, the ignition electrode is dirty, and whether the ignition electrode rod and claw are elastic.

c. You can use a multimeter to measure whether there is an ignition voltage between the two poles of the ignition electrode (you can manually point the "ignition start" in the "hardware debugging") (AC 24V for the automatic calorimeter, DC 24V for the microcomputer automatic calorimeter), if not, the ignition electrode is loosely connected or the ignition circuit board is broken.

2. Ignition failure, if the ignition wire has been burned:

a. Stirring failure, such as the stirring rod is stuck, and it does not rotate when stirring.

b. If the inner bucket is not filled with water or the amount of water is insufficient, you can observe whether the water is normal at the beginning of the experiment.

c. If the coal sample has been burned, it may be that the calorific value of the sample is too low, and additives can be added for experiments.

d. If the benzoic acid test is done and the ignition wire is melted into the benzoic acid, it may be that the oxygen bomb core seat is not dried after cleaning, the contact resistance between the crucible frame and the ignition wire is too large, or the reason is benzoic acid.

This article is what I saw on the original technical article of Hebi Santai Instrument, I hope it can be helpful to you.

The ignition wire is not tightly tied.

The ignition wire is too far away from the specimen.

When oxygenated, the specimen gets wet.

The screws that fix the stirring blades are loose, the rod rotates, and the blades do not rotate.

The platinum resistance of the probe has moved to the middle or upper part of the probe.

The probe is not inserted into the inner barrel.

Hebi Keli's calorimeter does not have so many faults.

Hebi Keli. They will tell you.

Hebi Keli summarizes some common reasons.

1. Simple Failure - Causes Calorimeter Ignition Failure - Causes of Calorimeter Ignition Failure and Treatment Methods.

1. Forget to fill oxygen.

2. The ignition wire is not tightly tied.

3. The calorific value of the measured object is too low (less than 1500 calories).

4. The oxygen bomb is seriously leaking, and the oxygen has been leaked by the time the experiment begins.

2. Oxygen bomb short circuit - causes calorimeter ignition failure - causes of calorimeter ignition failure and treatment methods.

1. The two ignition electrodes are in contact with each other.

2. The white insulating pad of the oxygen warhead is aging, resulting in a short circuit between the warhead and the projectile body.

3. The ignition wire is installed incorrectly, and the ignition wire touches the crucible or the wall of the barrel.

3. The ignition line is not smooth - causing the ignition failure of the calorimeter - the causes of the ignition failure of the calorimeter and the treatment method.

1. After the equivalent calorimeter is covered, the spring electrode on the cover cannot touch the oxygen warhead: adjust the length of the spring electrode.

2. The contact point between the 24V power supply and the chassis inside the calorimeter is rusted or falling off: open the back cover, find the contact point between the 24V and the interface, polish the contact point with sandpaper, and then connect it reliably. (Coal Quality Analysis Instrument).

3. The triangular bracket of the inner cylinder has scale or rust: use a blade or a stool to brighten the contact point.

4. The two electrode columns in the oxygen bomb are wrapped in dust or rust, and are brightened with sandpaper.

Fourth, stirring failure - resulting in calorimeter ignition failure.

1. The stirring electrode is bad - remove the shell, copy the model of the stirring electrode, and buy and replace it.

2. The shaft of the stirring blade and the stirring motor falls off: you can install it.

1. Common faults and causes of calorimeters and calorimeters.

Serial number. Phenomenon.

Cause. Dispose.

Bomb leakage. Aging or wear of rubber seals.

Replace the seal.

Ignition failed. The line is not passable or the contact is poor;

Check whether the wires are connected, whether the oxygen warhead is in good contact with the ignition cap, and whether the inner cylinder of the oxygen bomb is placed.

The specimen is wet. Splash wet specimen with too fast oxygenation.

Ignition wire or cotton thread is in poor contact with the specimen.

Resample. The two electrodes are too dirty.

Sand the electrodes with sandpaper.

Ignition cap oxidation.

Sandpaper the ignition cap oxide.

The two electrodes are short-circuited to the crucible (it is easy to burn the crucible and electrode).

Replace the electrode or crucible and reload.

The specimen burns incompletely, and the specimen is not flammable.

Insufficient oxygen or insufficient oxygen pressure.

Wrap the specimen with lens polishing paper to extend the oxygenation time and replace the oxygen cylinder.

After ignition, the humidity rises too high and the calorific value is too high.

The agitator does not rotate, the stirring shaft is stuck, the line is not passable, and the stirring blade falls off.

Insert a cotton thread into the hole of the nylon rod connected to the stirring shaft and reinsert it.

The trial does not end for a long time.

The ambient temperature is too high.

Adjust the water temperature of the outer cylinder to be basically the same as the room temperature, or reduce the indoor temperature.

Air leakage during oxygenation.

Aging or wear of seals during oxygenation.

Replace the seal.

2. Daily maintenance and inspection of calorimeter and calorimeter.

1. Oxygen bomb of calorimeter: In addition to cleaning and drying the oxygen bomb after each test, the following points should also be paid attention to and checked:

1) The oxygen bomb of the calorimeter can only be twisted by hand, when the hand feels resistance, it should be stopped, do not use tools to screw, and after the test is completed every day, it should be cleaned once.

2) The elastic cap and valve seat should be rinsed and dried after use.

3) Rinse the springing cup, scrub the threads, and check whether there is any mechanical damage on the springing cup, and pay attention not to turn the bullet cup upside down.

4) Check whether the sealing ring is worn and damaged during combustion, if the seal is not tight and there is air leakage, it should be replaced.

5) Check whether the insulating mat and insulating sleeve are in good condition, whether there is any damage, and check the insulation performance regularly.

6) Conduct the oxygen bomb on a regular basis.

Hydrostatic test, after each hydrostatic test, the use of the oxygen bomb shall not exceed one year (or shall not exceed 5000 tests).

2. The inner cylinder of the calorimeter: After the test, the water in the cylinder should be discharged to the outer cylinder, wiped dry and kept clean.

3. Test water: it is best to use pure water, and it should be replaced regularly to ensure the reliability and success rate of the test.

Note: In order to use the system safely, computer equipment must be reliably grounded.

For details of Hebi Hengke Instrumentation **** Coal Quality Instrument Technology Department, please log in to Hebi Hengke Company**:

1.Oxygen bomb leakage: The rubber seal is aged or worn.

2.The agitator does not ** the mixing shaft is stuck; The line is not passable; Check whether the pulp blades collide with the oxygen bomb or the wall of the calorimetry cylinder; Loose blade fixing nut; The blade angle is wrong (around 45).

3.Ignition failure: the line is not through or the contact is poor; The specimen is wet or the oxygenation rate is too fast, and the specimen is splashed wet; The ignition wire or cotton thread is not in contact with the specimen; The two electrodes are short-circuited with the crucible (it is easy to burn the crucible and electrode at this time);

4.The specimen burns incompletely, and the specimen is not flammable. Oxygen is not sufficient.

5.The lifting head cannot be closed: there is a foreign object on the lifting shaft; There are water droplets in the small holes of the water level probe; The small magnets on the barrel are magnetically unstable; The position switch under the motor screw does not start properly.

6.The automatic calorimeter test does not end for a long time, the ambient temperature is too high, and the water temperature of the outer cylinder is basically the same as the room temperature, or the indoor temperature is reduced.

1. Check whether there is ignition voltage.

2. Check whether the oxygen bomb electrode is well connected and whether there is oxidation.

3. Check whether the oxygen bomb is in good contact with the inner cylinder when placed in the inner cylinder.

4. Check whether the ignition wire or cotton thread is in good contact.

5. Coal samples do not need to be mixed with combustibles, but only low-calorific value substances.

Standardized operation, careful and careful, is the basic standard of laboratory testing.

1. Check whether there is ignition voltage.

2. Check whether the oxygen bomb electrode is well connected and whether there is oxide scale.

3. Check whether the oxygen bomb is in good contact with the inner cylinder when placed in the inner cylinder.

4. Check whether the ignition wire or cotton thread is in good contact.

5. Coal samples do not need to be mixed with combustibles, but only low-calorific value substances.

Automatic calorimeter maintenance method:

At the end of each day's experiment, the following inspections and maintenance should be carried out frequently, so that the instrument can always be kept in good working condition and can prolong the service life.

1. Oxygen bomb: In addition to cleaning and drying the oxygen bomb after each test, the following points should also be paid attention to and checked

1) The oxygen bomb can only be twisted by hand, when the hand feels tightened, it should be stopped, do not use tools to screw hard, and after the test is completed every day, it should be cleaned once.

2) The elastic cap and valve seat should be rinsed and dried after use.

3) Rinse the springing cup, scrub the threads, and check whether there is mechanical damage to the upper part of the springing cup, and pay attention not to turn the bullet cup upside down.

4) Check whether the sealing ring is worn and burned, and if the seal is not tight and there is air leakage, it should be replaced.

5) Check whether the insulating sleeve is good and whether there is any damage.

6) Periodic hydrostatic tests on the oxygen bomb, after each hydrostatic test, the use time of the oxygen bomb shall not exceed one year (or shall not exceed 5000 tests).

2. Jacket water cylinder: If the test is not done continuously, the water in the cylinder needs to be discharged, keep the inside clean and clean, and do not let the dirt fall into the cylinder.

1. Ignition failure.

1. Check the fuse first, the location of the fuse is usually at the back of the machine.

2. Check the three pillars under the oxygen bomb, whether the ignition head on the top cover is rusty, if rust will cause poor contact, sandpaper should be used to polish and remove rust.

3. Check whether the ignition wire in the oxygen bomb is tightened, whether the cotton thread is connected, and whether the oxygen is sufficient.

Second, the oxygen bomb leaks.

1. The main thing is to check the damage of the sealing ring, there are four kinds of sealing rings on the machine.

2. The laboratory personnel should learn from the commissioning and installation personnel the dismantling and replacement of the four sealing rings and the location. 1. First of all, we must protect the health of the environment.

2. Open the lid of the machine to keep the machine dry.

3. When the temperature is low, it is necessary to keep the water in the machine from freezing.

Hebi Huanuo Calorimeter Technology Sharing:

The oxygen bomb of the calorimeter plays a very important role in the actual operation, if you do not pay attention to some problems, it will cause ignition failure, resulting in the failure of the whole experiment, and even very serious consequences. In the process of using the oxygen bomb, attention should be paid to the following aspects:

1.The new oxygen bomb of the oxygen bomb calorimeter and the oxygen bomb (cartridge, warhead, connecting ring) of the newly replaced parts should be tested by 20MPa water pressure to prove that there is no problem before they can be used.

2.Attention should always be paid to observe the structure related to the strength of the oxygen bomb calorimeter, such as the thread of the cartridge and the connecting ring, the inlet valve, the outlet valve and the connection between the electrode and the warhead, etc., if it is found that it is significantly worn or loose, it should be repaired and reused after passing the hydrostatic test.

3.The oxygen bomb of the calorimeter should also be tested regularly, and after each hydrostatic test, the use time of the oxygen bomb of the oxygen bomb calorimeter should generally not exceed 2 years.

4.When using multiple designs to make the same bomb, each bomb must be used as a complete unit.

The interchangeable use of the bomb parts of the bomb can lead to serious accidents.

5.After the calorimeter is used for a period of time, it should be checked whether the sealing ring is worn and damaged during combustion, if the seal is not tight and there is air leakage, it should be replaced, check whether the insulating pad and insulating sleeve are good, whether there is damage, and the insulation performance can be checked regularly. The rubber ring of the oxygen bomb of the calorimeter is easy to wear out, which makes the ignition failure of the experiment or makes the results of the experiment unstable.

Therefore, check frequently, and replace it in time, and try to use the original spare parts for supporting use.

6.In addition, the two ignition electrodes in the calorimeter are easy to oxidize, and the elastic cap and valve seat should be rinsed and dried after use, and the ignition cap oxide should be sanded with sandpaper after a period of time.

In short, in the use of the oxygen bomb precautions of the calorimeter, coupled with the usual maintenance and maintenance of the oxygen bomb of the calorimeter, this will prolong the service life of the oxygen bomb of the calorimeter in the calorimeter.