1. Instrument Maintenance
Clean the furnace and electrodes every 50 analyses or twice a day. Replace every chemical reagent every 500 times. After absorbing sodium hydroxide, its color will change (become light gray). If the water-absorbing agent clumps, magnesium perchlorate is saturated. The water absorbent must be replaced before it is completely agglomerated. In addition to filling the reagent tubes with reagents, some lead-free glass wool is also plugged at the bottom of the tubes. The filling thickness of glass wool should be strictly in accordance with the instructions. Too thick will block the gas path. If it is too thin, the magnesium perchlorate particles will pass through the glass wool and deposit on the bottom of the tube, causing serious damage to the instrument.
Replace the electrode every 1000 times or when the electrode material turns off-white. Because the furnace is in a high temperature environment, the graphite base and upper electrode will wear out and must be replaced at any time. Otherwise, there will be pores or even no contact between the crucible and the upper electrode, so there is no current.
Every 3000 times, replace the copper oxide catalyst in the catalytic furnace, remove the electrode from the furnace and clean it with a brush.
Regularly check and replace the O-ring. When removing the old O-ring, be sure not to damage the sealing area. Be sure to wipe the groove of the O-ring and apply vacuum silicone grease. Apply vacuum silicone grease after installing the O-ring, otherwise the O-ring will rotate with the glass tube.
Prevent the glass tube from getting dust. Once the quartz wool gets dirty, replace it immediately.
2. Failure analysis and treatment
(1) The oxygen and nitrogen blank values ​​exceed 20. This situation is due to the small airflow that cannot drive the air out of the furnace. The gas flow can be adjusted, and the carrier gas pressure can be adjusted between 0.2 and 0.4 MPa. Turn on the instrument carrier gas, put a graphite crucible on the lower electrode, turn on the main power switch, click the furnace off button on the software, turn off the furnace and wait for 10s. Adjust the flow regulator until the flow meter a shows 30L / h, and turn on the furnace. Adjust the regulator until the flow meter b shows 50L / h, and turn off the furnace again. If the above settings are unstable, increase the flow rate to 100 L / h and adjust repeatedly until the instrument is stable.
(2) The power supply is normal and the communication is normal. After clicking the confirm button, the analyzer does not work. This situation can occur if there is no water flow, the furnace temperature is too high, or the instrument channel voltage is abnormal. If there is no water flow, the temperature of the furnace is too high. This information will be displayed on the display screen, but there is no information showing that these two items are normal. Next, check the zero voltage of the instrument channel. If it is higher than ± 3V by more than 1V, it is probably because the gas cylinder is empty, or air has entered the analyzer. Check and replace the chemical reagent. If air enters the thermal conductivity cell, the voltage of the thermal conductivity cell will be <-6V. At this time, open the right door to block the furnace gas inlet. After 10s, the thermal conductivity cell voltage value will inevitably rise . After one-by-one investigation, it was finally confirmed that there was a problem with the alkali asbestos, and the instrument was normal after replacement.
(3) During the analysis, the ammeter shows that the current value is zero. This situation is due to poor electrode contact in the furnace. After observing the gap between the upper and lower parts of the furnace, adjust the gasket between the upper and lower parts to eliminate the gap, but the instrument is still not normal. Upon further observation, it was determined that the electrode wear caused the poor contact, and the instrument was normal after replacing the upper and lower electrodes.
(4) Displayed when the instrument is started. No water flow! The system analyzes that the current is cut off and the analysis stops. In this case, the water flow detector is abnormal, the pump does not work, and the pipeline is blocked. Remove the right panel of the instrument, observe the water flow detector, squeeze the plastic water bottle with water by hand, and find that the water flow is normal and the display is normal, which proves that the water flow detector is normal and the pipeline is smooth. Start the circulating water pump, but the analyzer shows no water flow, at this time it can be determined that the water pump is not normal. Open the water pump rotor seal, start the pump and find that the motor is running normally, then turn off the water inlet, remove the water pump, and find that the impeller is off. It is understood that it is because the external cooling water is stopped, and the temperature of the circulating water in the instrument is too high (the water temperature should be ≤70 ° C), which causes the impeller (impeller material PVC) to thermally expand and disengage. After the impeller is bonded with adhesive, it is then adhered to the shaft of the impeller. After the adhesive is solidified, it is tested and the instrument runs normally.
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