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0102030405
Huazheng HZWS-C2 Transformer Oil Moisture Tester
I. Overview
Instrument Features:
1.32-bit embedded microprocessor as the main control core, with an embedded mini operating system for enhanced performance.
2.0-400 mA automatic detection with high precision, fast measurement speed, and stable, reliable operation.
3.High-quality SMT components on the motherboard, providing high integration, simple operation, and a long service life.
4.Four calcula
Technical Parameters
Titration method：Coulometric titration（Coulomb analysis）
Display：Color LCD touch screen
Electrolytic current control：0～400mA automatic control
Measurement scope：1ug～200mg
Sensitive valve：0.1µg H2O
Accuracy：10µg～1000µg±3µg
More than 1mg but not greater than 0.3%
Printer：Miniature thermal printer
Power supply：220V±10% 60Hz
Power：＜ 40W
Ambient temperature：5～40℃
Ambient humidity：≤ 85%
External dimension：380×310×180
Weight：About 6kg
Working Principle
The equation of Karl Fischer reagent and water is as following:
I2 + SO2 + 3C5 H5 N + H2O —→ 2C5 H5 N•HI + C5 H5 N•SO3 ……………… (1)
C5 H5 N•SO3 + CH3OH —→ C5 H5 N•HSO4CH3 …………… (2)
All the reagent solution used is mixed by dominant iodine and pyridine & methanol that filled with sulfur dioxide. The iodine is formed in anode through electrolysis, which is proportional to the quantity of electric charge as per Faraday's law and can be shown as the below formula.
2I¯+ 2e —→ I2 …………………………………………………(3)
From formula (1), the mole number of iodine participated in reaction is same as that of water. The moisture will take part in reaction immediately after the sample was injected into electrolyte solution, the consumption of iodine during reaction can be reflected by this instrument, moreover, consumption of iodine can be calculated according to the using quantity of electricity and the moisture amount will be shown in the LCD screen directly. Electrolytic current automatic control system is adopted in this instrument and the size of electrolytic current can be automatically controlled as per the quantity of moisture in sample, which can reach at 400mA. During the process of electrolytic, the moisture will be decreased gradually and the electrolytic rate will be also reduced according to the proportion until the control circuit is open at the end of electrolytic. This system enables to guarantee the high precision, sensitive valve and speed in the process of analysis. Additionally, some interference factors have to be introduced in the measurement, for instance, the moisture intruded from air make the electrolytic tank absorb moisture and occur blank current. However, the displayed number shown on screen is the real moisture content of sample since the blank current can be stored in this instrument.
tion formulas are included, and measurement results are automatically converted to the required units, with the ability to switch between units.
5.Color touch screen with a full numeric keyboard, offering a more intuitive operation and quick data calculations.
6.Graphical curve analysis to help track and analyze trends in water content.
7.Language switch between Chinese and English at any time for ease of use.
II.Matters Needing Attention
1. Electrolyte Considerations
Electrolyte Capacity
During normal determination, every 100 mL of electrolyte can react with no less than 1 g of water. If the determination time is too long, the electrolyte’s sensitivity will decrease, and it should be replaced.
Electrolyte Condition in the Cathode Chamber
The electrolyte in the cathode chamber should be replaced promptly if strong bubbles are released or if the electrolyte turns a light reddish-brown color during the determination process. This indicates contamination, and it may cause the blank current to increase, reduce measurement reproducibility, and prolong the time to reach the endpoint.
Electrolytic Time and Stability
If the electrolytic time exceeds half an hour and the instrument becomes unstable, stop stirring. Observe the ceramic filter plate at the bottom of the anode to check for significant brown iodine production. If little or no iodine is produced, the electrolyte should be replaced.
Safety Precautions
Take care not to inhale or touch the electrolyte with your hands. If contact occurs, rinse the affected area thoroughly with water. The electrolyte has a strong odor and contains certain toxic substances, so it is essential to ensure proper ventilation in the laboratory.
2. Matters to Consider During Determination
Sample Injection
When injecting the sample into the electrolytic cell, ensure that the needle of the liquid sampler is inserted into the electrolyte. The liquid, solid, and gas samplers, as well as the sample itself, should not come into contact with the inner wall or the electrode of the electrolytic cell.
III.Packing List
|
No. |
Item |
Qty |
|
1 |
Transformer Oil Moisture Tester |
1 |
|
2 |
Titration cell (1 electrolytic cell + 1 electrolytic electrode + 1 measuring electrode + 1 drying tube + 3 plugs + 1 stirrer + 1 sample plug + 1 bag of color-changing silica gel |
1 |
|
3 |
Power line |
1 |
|
4 |
0.5μ L microinjector |
1 |
|
5 |
50μ L microinjector |
1 |
|
6 |
1 ml sampler |
1 |
|
7 |
Closed needle (9#) |
1 |
|
8 |
Silicone pad |
10 |
|
9 |
Vacuum grease |
1 |
|
10 |
Karl Fischer's reagent (electrolyte) |
1 |
|
11 |
Pick-up tube |
1 |
|
12 |
Safety tube (4A) |
2 |
|
13 |
Typing paper |
1 |
|
14 |
Operating manual |
1 |
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