Significance of moisture in the use of grease:
1) Water exists in grease in two forms.
One is structural water, forming hydrate crystallization, this water is the stabilizer of grease, is an indispensable component, is allowed to exist in the grease.
The other is free water, adsorbed or mixed in the grease, is harmful to the grease, will reduce the lubricity, mechanical stability and chemical stability of the grease.
If the free water is too much, it will have a corrosive effect on the parts.
2) Calcium-based grease contains a mass fraction of structural water of 1.5%-3%.
This kind of grease containing structural water, the general use of the temperature does not exceed 70-80℃.
Otherwise, it will lose moisture, destroy the structure of fat, cause the separation of oil and soap, and lose the lubrication effect.
The trace moisture in lubricating oil was determined according to GB/T 11133-2015 "Determination of water content in petroleum products, lubricants and additives - Karl Fischer Coulomb titration".
SH103B grease trace moisture tester adopts according to the principle of Carl Fischer Coulomb titration, using microcomputer automatic control, compared with similar products at home and abroad, has the advantages of high sensitivity, fast electrolysis speed, short balance time, accurate blank deduction, accurate analysis results and so on.
It is a high quality analytical instrument for petroleum, chemical, electric power, environmental protection, medicine, scientific research and other departments.
The instrument adopts 32-bit embedded microprocessor as the main control core, embedded in the mini-operating system;
The instrument comes with constant current detection, double circuit balance titration function;
The electrolytic tank adopts waterproof and sealed design;
Support multiple calculation formulas, in line with the standard GBT11133 and ASTMD 0304.
Technical parameters:
Carl, -- Hugh coulomb's law, to determination of trace moisture of different materials, is one of the most reliable method, in line with the GB/T11133, this trace moisture meter and the success of the application of this method, and used the micro computer control, its fast analysis speed, high precision, Chinese LCD color screen display, automatic printing, double CPU design, blank current deducted automatically and instrument fault self-diagnosis function, menu selection, and other functions, to achieve a better operation and use, has simple operation, automatic analysis instrument.
It is an instrument for oil moisture analysis
Display mode: color touch screen display
Titration method: microcomputer controlled electric titration
Output mode: automatic calculation, can output ug, PPM and %
Instruments for the experiment
1.SH103B automatic trace moisture meter, developed and produced by Shandong Shengtai Instrument Co., Ltd.
2. Comply with GB/T11133.
Experimental steps:
First, preparation work
1. After the instrument is unpacked, please count the accessories according to the packing list. If there is any damage, please contact our company.
2. The instrument should be carried vertically, and the tilt Angle along the height of the instrument should not exceed 30 degrees. It should be placed in a dark place and placed smoothly, otherwise there will be vibration after the start of the instrument, which will affect the service life of the instrument.
3, the instrument power supply is connected to the capacity of more than 220V/10A socket, pay attention to must have a good grounding wire.
Second, the experimental process
1. Sampling: Flush the 1ml syringe used with the sample to be tested.
2, sample injection and determination
After sampling, click the "start" button, the instrument shows the status of "titration", the sample is injected into the anode chamber through the sample feeding cock, the titration automatically starts, and the moisture value continues to increase.
When titration is over, the buzzer sounds and the status message indicates that the measurement is completed.
The printer will print out the measurement results when enabled.
If you want to change the calculation formula or the relevant parameters in the formula before the titration is over, click "Setting" - "Formula Selection" (- "Formula Parameter Setting") to complete the titration before the titration is over.
1. After starting the machine, the instrument will automatically enter the test interface within a few seconds after the starting interface is displayed:
To switch electrolytic current or start and stop stirring, click "electrolyze" and "stir" buttons.
Click "Start" to display the state of "titrating". The sample can be injected through the injection port, and the instrument will titrate automatically.
After titration, display the measured moisture value and print the determination result.
If you need to change the calculation formula, you can click the "Set" button to enter the setting menu interface
(1) Formula selection
In this interface, you can click the formula you want to select to confirm.
Click the "formula parameter setting" button in the upper right to enter the parameter setting interface of the selected formula.
The interface explains the parameters used in each formula:
Formula 1: F1=DT/(V*SG) PPM measurement results /(sample volume × specific gravity)
Formula 2: F2=DT/(W-W) PPM measurement results /(total weight of the sample -- tare weight)
Formula 3: F3=DT/W 'PPM measurement results/sample weight
Formula 4: F4=DT/(W/K) PPM measurement results /(sample weight/dilution coefficient)
Formula 5: F5= dT UG measurement results (measured moisture value)
Wherein, dT -- measured moisture value, unit: ug;
V - Sample injection volume, unit: ml;
SG -- sample density, unit: g/ mL;
W -- total weight of sample, unit: Mg;
W - tare weight, unit: mg;
W '-- weight of sample, unit: mg;
K -- dilution coefficient.
For more information please contact: 0531-85919987 Shandong Shengtai Instrument Co., Ltd
(2) Test records
This interface is the test data recording interface, which allows you to view the data recording of the test results of the previous tests.
Click "Up" and "Down" to scroll through the records one by one.
Click "Clear" to pop up a prompt box for clearing test records. If you click "OK" in the prompt box, all data records can be deleted.
(3) Print Settings
Under this interface, you can optionally set to enable or disable the printer.
When enabled, after the test is completed, the instrument will automatically print the test results;
When disabled, do not print test results.