Sulfur measuring instrument

Coal testing instrument, sulfur analyzer, purifier, electrolytic cell complete equipment

The electrolytic cell has a capacity of 400 milliliters.

Electrolytic platinum electrode area: large piece (10 × 15mm, thickness: 0.08mm); Small piece (10 × 12mm, thickness: 0.06mm).

Installation and leak detection of electrolytic cell:

Remove the four screws on the cover of the electrolytic cell with a screwdriver, place the stirring rod into the electrolytic cell, cover the cover, tighten the screws, cover the rubber stopper, turn on the power switch of the purification device, adjust the air flow rate to 1000mL/min, and then close the two-way valve between the combustion tube and the electrolytic cell. If the air flow rate drops below 500mL/min, it proves that the air tightness is good. Otherwise, check all components and their interfaces.

Electrolytic cell malfunction and solution:

(1) The upper cover of the electrolytic cell needs to be tightened, the sealing ring is aging, and there is glue opening at various inlet and outlet holes, all of which are causes of air leakage.

(2) There are four electrode plates in the electrolytic cell, with two smaller ones in each group serving as indicator electrodes and two larger ones serving as electrolytic electrodes. The indicator electrode plays a role in sensing the titration of the electrolyte and controlling the electrolytic electrode for titration. If any electrode malfunctions, it will cause the experiment to be unable to proceed. So it is necessary to ensure the cleanliness of the surfaces of the four pole pieces, and the sealing area must not crack.

(3) If the indicator electrode is disconnected from its lead (such as when the sealing adhesive cracks), it will cause the electrolytic electrode to continue electrolysis and cannot be stopped. The electrolyte turns red, and the screen counts quickly (even without coal samples), resulting in surface fouling. If the electrolysis electrode is disconnected from its lead, it will cause the electrolyte to become increasingly white during sample preparation, but the screen will not count, which is equivalent to the electrolysis switch being turned off. The surface fouling is manifested as delayed electrolysis, that is, electrolysis only suddenly opens when the liquid is very white, and the measurement results are seriously low and unstable.

Solution: For surfaces that are sticky, they can be cleaned. For those that break due to glue breakage, the residual glue can be removed, the plastic tube connected to the pole piece can be removed, the inner wall can be cleaned, the corroded lead part can be replaced, re welded, and sealed. Do not seal the crack with glue, as the electrolyte may have accumulated inside and the lead has been corroded, making it non-conductive with the pole piece.

(4) The fault phenomenon caused by long-term oxidation and loosening of the outlet plug of the electrolytic cell and the socket on the machine is similar to contamination or open circuit of the pole piece. The plug can be coated with a thin layer of solder to remove its oxide layer and increase the tightness between the plug and the socket, or the lead can be directly soldered to the corresponding point inside the machine.