The trace moisture analyzer is a widely used moisture analyzer in real life. It is mainly used in the production and experiments of medicine, plastics, chemicals, food, food, feed, seeds and other industries. The trace moisture analyzer not only measures accurately, but also Application is also more convenient. Let's share how the trace moisture analyzer operates and works in specific situations.
1. Calibration of the trace moisture analyzer, plug the power socket on the rear panel of the main unit of the moisture analyzer into an AC 220V power supply, press the power switch, and the LCD screen is on. Press any key to enter the test interface, and then press the electrolysis key. At this time, the instrument automatically counts and the self-test begins: short-circuit the two electrodes inside and outside the electrolysis electrode socket, and the display screen counts quickly; short-circuit the two electrodes inside and outside the measurement electrode socket, and the display screen status Iodine is displayed, the number stops counting; press the start key on the host, the display number is cleared, the buzzer sounds after about one minute, the display prompts: Please connect the measuring electrode. If the above situation occurs, it means that the trace moisture analyzer is working normally.
Second, do a good job of cleaning and drying the titration cell. a. Before using the micro moisture analyzer, open all glass ports of the titration cell. The titration cell, drying tube, sealing plug, stirrer can be cleaned with water, methanol or acetone, and the cathode chamber and measurement battery should be cleaned with methanol or acetone, but do not Clean to the electrode lead. (Note that the cathode chamber and measuring electrode must not be cleaned with water, otherwise it will cause measurement error.) After cleaning, put it in an oven at about 60C for 4 hours, and then let it cool naturally. b. Put the color-changing silica gel into the drying tube (be careful not to load the powder); put the silicone rubber pad into the injection cock and screw it into the fastening stud; put the stirrer carefully into the titration cell; then separately in the cathode chamber, Measure the grind of the battery, the drying tube, the injection cock, and the sealing plug, and evenly apply a thin layer of vacuum grease. Except that the drying tube and sealing plug of the cathode chamber are not installed, all others are installed on the corresponding parts. Gently turn a few times to make it better sealed; c. Inject about 100-120mL of electrolyte into the cathode chamber through the sealed funnel through the dried funnel, and then use the funnel to inject the electrolyte through the dry tube socket of the cathode chamber. 1. The liquid level of the anode chamber should be basically level. After completion, install the drying tube and sealing plug, and turn it a few times to make it better sealed (the electrolyte loading work should be carried out in a fume hood); d. Place the titration cell on the electrolytic cell seat on the host Then, insert the measuring electrode plug and the electrolytic electrode plug on the cathode chamber into the measuring and electrolytic sockets respectively.
3. For the adjustment of reagents, press the power switch, the LCD screen lights up, and the power is turned on. Adjust the stirring speed control knob of the stirrer to make the electrolyte in the anode chamber form a vortex, but it cannot be splashed on the wall of the pool. At this time, if the status shows iodine and prompt: please inject appropriate amount of pure water. Press the electrolytic button and use a 50ul sampler to draw a certain amount of pure water (the new reagent needs to be injected with about 20-50ul of pure water) and slowly inject the reagent into the reagent through the injection cock. The color of the reagent slowly changed from dark brown to light yellow until the state changed to over water. At this time, there will be a real-time electrolysis curve, and the display will start to count. At this time, remove the injector and wait for the instrument to adjust the balance automatically. The instrument status display is normal, and the alarm reaches the equilibrium state.
4. The clearance and influence of the blank current. If the electrolysis curve is relatively high or the measurement indication number is unstable, there is moisture attached to the wall of the titration cell. At this time, the electrolysis can be turned off, the titration cell can be removed, and it can be slowly tilted to rotate, so that the water on the cell wall is absorbed, and then press the electrolysis key to continue electrolysis. This step can be repeated several times, the electrolysis curve will drop to a relatively low level, and the measurement signal is stable before testing. If the blank current (electrolysis curve) still cannot be reduced, it may be affected by the intrusion of moisture from the atmosphere, or it may be caused by the adsorption of moisture by the ceramic filter plate in the cathode chamber. At this time, you should check the sealing condition of the grinding joint surface of the titration cell, whether the silica gel fails, whether the hole of the silicone rubber pad in the injection cock is too large, and whether the cleaning and drying effect of the cathode chamber is good. Perform the corresponding processing and repeat the above operation to get over. When measuring the moisture content in a sample, in order to obtain high-precision data, we hope that the blank current is as small as possible. In general, the measurement can be performed as long as the status prompt is normal. When there are special requirements for measurement accuracy or the water content in the sample to be measured is low, the electrolysis curve should be as low and stable as possible, and the measurement signal is relatively stable.
5. Calibration instrument. When the trace moisture analyzer reaches the initial equilibrium point and is relatively stable, it can be calibrated with pure water. The buzzer sounds and the status is normal, indicating that the electrolysis has reached the end point. The display result should be 100 ± 10ug, generally calibrated 2 to 3 times, and the displayed number can be measured within the error range.
6. After the calibration is completed, we can operate the instrument according to the function selection of the trace moisture analyzer.
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