HZKF-2 Karl Fischer Trace Moisture Apparatus
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HZKF-2 Karl Fischer Trace Moisture Apparatus
Overview
The HZKF-2 oil trace moisture analyzer of our company meets the requirements of GB/T 7600, SH/T 0255, GB/T6283, SH/T 0246 and other method standards. The Karl Fischer (Coulomb) method was adopted to determine the content of trace amounts of moisture in liquids of different properties.
Working Principle
The reagent solution is a mixture of the predominant iodine and sulfur dioxide-filled pyridine and methanol. The reaction of the reagent with water is based on the principle that iodine is reduced by sulfur dioxide in the presence of water to form pyridine hydroiodide and pyridine methyl hydrogen sulfate in the presence of pyridine and
methanol. The reaction formula is:
H₂O + I₂ + SO₂ + 3C₅H₅N → 2C₅H₅N·HI + C₅H₅N·SO₃
C₅H₅N·SO₃ + CH₃OH → C₅H₅N·HSO₄CH₃
During electrolysis, the electrode reactions are as follows:
Anode: 2I- - 2e → I2
Cathode: I2 + 2e → 2I-
2H+ + 2e → H2↑
The iodine produced by the anode reacts with water to form hydriodic acid until all the water has been reacted, and the end point of the reaction is indicated by a pair of platinum electrodes in a detection unit. According to Faraday's law of electrolysis, the number of molecules of iodine participating in the reaction is equal to the number of molecules
of water, which is proportional to the amount of charge. The equation for water quantity and charge is as follows:
W=Q/10. 722
Which, W -- moisture content in the samples Unit: micrograms
Q-Electrolytic amount unit: millicoulombs
Technical Indicators
| Parameter | Specification |
| Accuracy | 3 μg ～ 1 mg: ±3 μg; >1 mg: 0.3% (excluding injection error) |
| Measuring Range | 3 μg ～ 100 mg |
| Resolution | 0.1 μg |
| Electrolytic Current | 0 ～ 400 mA |
| Maximum Electrolytic Speed | 40 μg/s |
| Power Supply Voltage | AC 220 V ± 20% |
| Standby Power Consumption | 5 W |
| Ambient Temperature | 5 ～ 40 ℃ |
| Ambient Humidity | < 80% |
| Overall Dimensions | 320 × 240 × 200 mm |
| Weight | 4.5 kg |
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