Features and Operation of Rapid Automatic Hydrogen Meter

The automatic hydrogen meter is used to measure the content of carbon and hydrogen in organic and inorganic substances in coal and other solid materials. It is a kind of coal testing equipment and plays a decisive role in the coal, electric power and metallurgy fields. At the same time, it is also used in the chemical and commodity inspection industry. Has a great effect.

Compared with the currently used three-section furnace combustion method, the instrument has the advantages of rapid measurement, accurate results, simple operation, high degree of automation, touch keyboard input of various data, the printer to print the final results, small size, light weight and other characteristics, is the current laboratory Ideal for measuring hydrogen.

Performance characteristics:

1. The instrument is mainly used to determine the content of hydrogen in coal and other solid materials.

2. All the testing process is controlled by a single-chip microcomputer, and the test data is corrected and processed by the single-chip microcomputer. The number of milligrams or percentages of hydrogen in the measurement object is digitally displayed, and the final result is output by the printer.

3, each - sample measurement time is about 10 ~ 15min, speed, accuracy, simple operation, high degree of automation. It is an ideal hydrogen measurement instrument in the laboratory.

4, the instrument can also be measured by the weight of carbon absorption method, its accuracy and accuracy in line with national standards.

Technical parameters Determination range: Hydrogen 0 to 20% Carbon 1 to 99%

Heating rate: 25°C/min, 30min up to 800°C

Measurement time: about 10~15min

Allowable error: Hydrogen ≤ 0.15% (same laboratory) Carbon ≤ 50%

Power supply: AC220(1±10%)V, 50Hz

Temperature control: 800°C±10°C, 300°C±10°C

Linearity: ±0.1% Specimen: particle size <0.2mm, approx. 65mg,

First, prepare 1, charge:

Remove the plugs at both ends of the purge tube (behind), remove the purge tube, mark the middle position with a marker, mark 1 with a marker, and record another 10 cm in the direction of the sample nozzle. Note 2: Use the nozzle to remove the diameter A piece of high-temperature cotton plate, into the position of the mark 1 (visual inspection should be seamless). Place the line of copper oxide to mark 2 and remove the same size of high temperature cotton plate and push in mark 2 . Put the purifying tube back into the high-temperature furnace, and notice that the charging end must be at the high temperature end of the furnace.

Remove the sample nozzle at the end of the burner tube, remove the burner tube, center on the low-temperature thermocouple well of the high-temperature furnace, and measure 5 centimeters for each end, with 3 on the left and 4 on the right. Then use a nozzle to take off a piece of high-temperature cotton board and feed it into the mark 4, place the silver permanganate end mark 3 from the left end, and then remove the two high-temperature cotton plates and push the mark 3. Return the burner tube to the high-temperature furnace, install the sample nozzle, and tighten the screw.

2. Inline:

Put the controller and electric furnace in proper position, install the sample sending rod, and tighten the screws. Then the two sets of power cords from the controller to the electric furnace are marked with one-to-one correspondence of color labels, and the nuts are tightened. Insert two thermocouples into the two thermocouple holes of the high-temperature furnace according to the length of the wire, and the leads are connected to the thermocouple terminal behind the controller (high-temperature thermocouple is connected to the combustion furnace, and the low-temperature thermocouple is connected to the conversion furnace. , high temperature thermocouple to be returned when inserted 1mm)

3, gas connection:

Connect the pressure reducer to the oxygen cylinder, connect one end of the oxygen tube to the pressure reducer, and the other end to the right end of the purification tube. Connect the left end of the purification tube and the left end of the drying tower with silicone tube. The right end of the drying tower and the combustion tube Connect the air inlet at the bottom of the right end, taking care to keep the connections sealed.

4, electrolytic cell cleaning:

(1) Melt the washing powder with warm water and soak the electrolysis cell for 4 hours. Use a special brush to screw into the electrolytic cell in a clockwise direction (approximately 1 cm from the tail), and rotate it counterclockwise several times.

(2) Rinse the electrolytic cell with tap water and rinse with pure water and acetone, respectively. When flushing with acetone, squeeze it with a suction ball and repeat it several times.

(3) It is blown dry repeatedly between the electrolyzer nozzle and the outside using a hot air blower.

(4) Measure the two poles of the electrolytic cell infinitely large with a multimeter (Mega-European file).

(5) Clean up once every 100 samples or electrolytic cell current does not fall within 2 hours.

5, with electrolyte:

Take 7ML acetone and 3ML phosphoric acid in a 100 ML barrel until no delamination occurs. The electrolyte is poured into the half of the electrolysis cell. The flat discharge cell is slowly rotated so that the electrolyte is evenly applied to the cell, and then the excess flowed out. Place the blower on the countertop, and the electrolytic cell is in the same position as the blower mouth, blow dry with a cold air damper (first blow from the fine nozzle and 10 minutes from the coarse nozzle), and check the electrolyte at the thick nozzle with filter paper. If no instructions have been blown dry.

The electrolyte was poured into the electrolytic cell. When the electrolyte was separated from the tail by 1 cm, the cell was discharged and the above steps were repeated until it was dried.

Pour the electrolyte into half of the electrolysis cell and blow dry as above. Use a multimeter to measure the resistance of tens of euros.

6, installed electrolytic tank:

Insert the electrolytic cell into the hole in the middle of the radiator so that the electroplated platinum wire cannot be exposed. The radiator together with the electrolytic cell is mounted on the two brackets on the left end of the furnace body, and the electrolytic cell is connected with the combustion tube with a silicone tube and kept sealed. Connect the electrolytic cell to the controller with a green lead (no positive and negative polarity).

Second, operation:

1, coating:

Turn on the controller power switch, open the oxygen master valve, adjust the air flow (all 80ml/min), about 20 minutes later, the high temperature furnace temperature rises to 500°C, press the film button. The electrolysis current rises from zero to about 200mA. The timing is started in the upper right corner (the first two are minutes and the second one is every six seconds). The electrolytic cell is switched every three minutes and the electrolysis current drops from a maximum of 200mA each time. Below 100mA, the closer to 60mA is the best, (after about one hour the controller sounds a beep, if it still can not fall down, you need to press the film button again. When the three times after the film can not fall down, it is necessary to re-clean the electrolytic cell , and then dropped to 100-60mA, according to the monthly key input 4 digits, press the return key, the electrolytic current is reduced to 100-60mA, the coating is completed.

2, test:

First, make a sample of waste. Put about 65-70 milligrams of coal into the porcelain boat. Spread a layer of chromium oxide evenly over the coal sample. Open the insulated tube of the conical tube and place the porcelain boat in the middle of the quartz boat. Tight seal (check if the electrolytic current rises). Input quality (three digits, 65 milligrams to lose 650) Press the hydrogen key, the instrument automatically sends the sample to the high-temperature furnace step by step, about 13 minutes later, the sample vehicle returns, the result prints automatically, the test is over.

Do two blank tests. Put about 70 mg of chromium oxide in the porcelain boat (in peacetime, put it in the same amount above the coal sample). Put a blank button after putting it well, about 9 minutes later. Return, press the print key to print out the blank value. If the error of the two blank test results is within 0.05 milligrams, the blank test passes and the average value is calculated (otherwise, do it again until it passes).

Press the year key, enter the four-digit year number, and then press the month key, enter the two-digit month number and two-digit date number (such as March 9th, lose 0309), press the water key, enter the three pre-measured standard coal Analyze the moisture (eg 0.4%, input 040), press the blank key to enter the average value of the blank test, and press the blank key to end.

Make three standard coal samples (the same method as the waste sample), and the result will be automatically printed. If the average of the last two test results is within the error range of the standard value, the coal sample to be tested can be made, otherwise, the controller should be turned on. On the cover, adjust the fine-tuning knob in the middle hole of the glue board (clockwise rotation, the result will be reduced), and then do the standard coal until it is qualified.

When testing the coal sample, press the water key, input the analyzed moisture value of the coal sample (three digits), press the return key (place the coal sample) to input the quality, press the hydrogen bond, the test begins, about 13 minutes later, the sample The test is over. Test the next coal sample in the same way.

3. After the end of the test, press the clear key to turn off the controller power switch. Turn off the oxygen master valve and wait until the oxygen in the entire gas path is exhausted (in this case, the flowmeter indicates zero) and close the end of the electrolytic cell with a hose (Note: The hose plug must be removed before the next test).