Infrared Carbon and Sulfur Analyzers Common Fault Handling With regard to faults, infrared carbon-sulfur analyzers often have a variety of faults. For some minor faults, I will not go into details here, focusing on some typical faults. Handlers.

4.1: Abnormal sulfur curve, severely affecting elemental sulfur analysis.

Through the first complete cleaning of the stove head, replaced the aging sulfur detector transistor, replaced the C, S control board voltage adjustment potentiometer and the sampler loose input interface to be replaced. The sulphur curve is basically normal. Except for ferrosilicon and sulphur, the remaining samples can be analyzed. Replacement of sampler chip A/D board, heavy ground wire, soldered A/D board ground wire and USB ground wire, no significant improvement in ferrosilicon and sulfur curves. After replacing a new filter, ferrosilicon and sulphur have been greatly improved. Through the gain and frequency adjustment of C and S preamplifiers, the sulphur curve is basically normal and ferrosilicon can be analyzed.

Analysis of the causes: The temperature at which the filter is baked is not enough, resulting in partial moisture in the filter and absorption of part of the sulfur in the ferrosilicon, which leads to inability to analyze because the release rate of sulfur in the ferrosilicon is slow and the content is low.

4.2: Infrared carbon and sulfur analyzer head pressure is too high.

Furnace pressure indication is greater than the normal value of 0.08Mpa, observed analytical gas flow and oxygen flow is too low, the normal value of oxygen flow is 2 (l/min), the analytical gas flow is 3-4 (l/min), first Adjust the oxygen flow meter knob to adjust its flow to the normal value of 2 (l/min), then open the lid and adjust the needle valve in the instrument to adjust the flow of the analyzer gas to 3-4 (l/min). Now The gas path is normal, and it is found that the pressure of the burner is lower than the normal value of 0.08Mpa, and then adjust the panel regulator valve (fixer 2), so that the pressure of the burner head returns to normal. After the standard test equipment returned to normal.

4.3: Infrared carbon-sulfur analyzer An abnormal "smoke" is emitted at the high-frequency furnace fan.

First gas path diagnosis, observed at this time the burner pressure is less than 0.08Mpa, the combustion pressure is less than 0.15Mpa, the analysis gas flow is almost zero, and the adjustment knob is invalid, open the burner, found that the quartz tube ruptured, replaced with a new one, Re-diagnosis of the gas path is basically normal, and then adjust the needle valve so that the analytical gas flow rate reaches the normal value of 3-4 (l/min), and then adjust the value of the setter 2 so that the furnace head pressure reaches 0.08Mpa, adjust the value of the setter 1 to make the combustion pressure After reaching 0.15 MPa, all diagnoses are normal and normal analysis can be performed.

4.4: High-frequency furnace does not work.

Observed the normal gas path, but the high frequency did not work, first checked the total insurance behind the high frequency and found that the total insurance fuse. Then change, everything is normal. Then put it into use. I observed leaving for some time. After a while, he was told that the same phenomenon occurred. Check again that there is no harvest, then put on a new insurance and then start the observation, and then do less than three or four samples, found that the burning observation window at the "stained stains" sound of fire, and quickly shut down the stove to open all, view Induction coil and quartz combustion tube, found that the surface of the quartz tube oxide layer, and the induction ring oxidation is very bad and the distance is too close, replace a new quartz combustion tube, and use the sandpaper grinding induction coil surface, remove the oxide layer, adjust the rotation distance, Then turn on the analysis, everything is normal.

Cause: The oxide layer on the quartz burner tube causes a short circuit in the inductor.

4.5: Automatic cleaning device does not work.

First diagnose the gas path is normal, then check whether the cleaning cylinder is stuck and check the cylinder is normal. Then check the cylinder control solenoid valve and the control signal receiving board, both normal, because under normal circumstances the solenoid valve is no voltage, only when the switch is connected to the voltage to prompt the solenoid valve to work, and then found through the voltage measurement, when in the software When the automatic cleaning instruction is applied, it does not work. After inspection, it is the position of the cylinder limit switch that causes the automatic cleaning to not work. After adjustment to normal.

4.6: The board flow and the gate flow are all zero.

After inspection, it was found that the filament of the high-frequency oscillating tube was not bright, and immediately shut down to disconnect other loads connected to the high-frequency oscillating tube. After the measurement, it was found that the high-frequency oscillating tube was broken. After replacing the tube, everything is normal.

4.7: Failure of Carbon or Sulfur Voltages With regard to the maintenance of carbon-sulfur voltages, the following situations have mainly occurred in our maintenance practice. (1) One or two voltages of the carbon-sulfur voltage are zero: the heating of the light source is broken. By opening the absorption cell and observing the infrared light source module, it can be found that the CO2 (or SO2) infrared light source is not emitting light, and the multimeter is used to measure the light source heating wire. It is very simple to judge whether the heating wire breaks or not and can be restored by replacing the new heating wire voltage. normal. (2) The carbon-sulfur voltage is zero and does not jump: by measuring the output voltage of the signal channel with a multimeter, it will be found to be greater than 2.0000 volts. Overloading the 7135A/D chip of the instrument causes the BCD code output by the A/D chip to be 0. Adjust the gain potentiometer on the amplifier board to make the output normal. (3) The carbon-sulfur voltage drifts or fluctuates greatly: The reason is that the connector of the light source system is loose or the contact is poor, the socket is oxidized, etc., which leads to an increase in the contact resistance, and it is normal after re-welding the respective wiring.