Cangzhou Xinglong Engineering Instrument Co

Stone powder content tester methylene blue rapid tester wholesale price
Manufactured according to the stone powder content measurement conditions in national standard B "Construction Sand". It can be used to measure the stone powder content in the building material verification laboratories of the construction and transportation departments. This instrument consists of an electric stirring device, automatic speed and time controller, and measuring cup holder. According to the provisions of B, the instrument uses microcomputer technology to automatically implement the specified operating steps according to the selected method, and digitally displays the time and rotation speed.
Technical Parameters
Power supply voltage:
Maximum rotational speed: rotation
Minimum rotational speed: rotation
Impeller diameter
Number of impellers: pcs
Beaker volume:
Self-control function: You can choose methylene blue B measurement method or methylene blue rapid test method
Operation method:
Time setting: Turn on the power, first press the time setting dial code device, the time is displayed as bits. The maximum time is seconds. For example: set the stirring time to minutes and the dialer to . After stirring for minutes, stirring stops automatically. If you need to continue stirring for minutes, you can set the dialer to press the reset switch and the instrument will start working again, that is, stirring will stop after minutes. Each time the stirring stops, the instrument can automatically buzz and alarm.
Speed setting: When the instrument is powered on, flip the speed selection switch and the speed can be converted to RPM.
Start the instrument: After the time and rate settings are completed, press the start switch to enter the stirring state. If stirring is stopped midway, press the start switch again to enter the working state.
Operation method
The host of this instrument uses a constant-speed powerful electric mixer. It uses an advanced high-speed microcomputer chip to sample and control the motor speed. The speed is stable, the display is intuitive and clear, and the speed can be set at any time through the button. , and also has timing function and data saving function. And it adopts dual digital display, which is very intuitive and clear. Maximum timer hours and minutes. Once the parameters are set, they can be saved for a long time.
Example: Set the electric mixer to work every minute for hours and then stop working.
, close the power switch, then the original speed value is displayed on the left. The right display of (last running speed) is the original timing value
, press the speed key to set the speed to
, press the hour key to set the timing hour to
, press the minute key to set the timing minute to (Set the hours and minutes to indicate an irregularly open state)
Press the start button to start, the machine will start slowly until it turns minutes, and the timer will start at the same time, and then it will run stably for hours and minutes, then stop and alarm for seconds, indicating that the timer operation is completed
, Press stop to stop running at any time
, Green is the start light, and red is the stop light. The corresponding indicator light indicates that the instrument is in the corresponding state.
Test steps
Preparation of standard methylene blue solution..standard concentration)
() Determine the moisture content in methylene blue. Weigh the left and right methylene blue powder and record the mass to the nearest... Dry to constant weight at a temperature of ℃ to constant weight (the methylene blue powder will deteriorate if the temperature exceeds ℃), cool in a desiccator, then weigh and record the mass to the nearest . Calculate the moisture content of methylene blue according to the formula () ()
The mass of methylene blue powder in the formula ()
The mass of methylene blue after drying ().
() Take methylene blue powder (+) (.) (that is, the mass of methylene blue dry powder), accurate to.
()Heat a beaker filled with about 100% clean water. The water temperature does not exceed ℃.
() Add methylene blue powder while stirring, continue stirring until the methylene blue powder is completely dissolved, and then cool to ℃.
() Pour the solution into the volumetric flask, rinse the beaker, etc. with clean water, so that all the methylene blue solution is moved into the volumetric flask. The temperature of the volumetric flask and the solution should be maintained at ℃. Add clean water to the capacity. Bottle scale.
() Shake the volumetric flask to ensure that the methylene blue powder is completely dissolved. Move the standard solution into a dark storage bottle. The shelf life of the methylene blue standard solution should not be exceeded. The prepared solution should be marked with the date of preparation and expiration date, and should be stored away from light.
. Preparation of fine aggregate suspension
() Take a representative sample, divide it into approximately 100 pieces, dry it in an oven at ℃ to constant weight, and after cooling to room temperature, sieve Except for particles larger than ., divide into two parts and set aside.
() Weigh the sample to the nearest accuracy. Pour the sample into a beaker filled with clean water, adjust the stirrer speed to a position where the stirrer impeller is approximately 2 inches away from the bottom of the beaker. Stir to form a suspension, add the methylene blue solution accurately with a pipette, and then keep stirring at r speed until the end of the test.
, Determination of methylene blue adsorption capacity
() Place the filter paper on the top of the open beaker, so that it does not come into contact with any other items.
() After adding methylene blue solution to the fine aggregate suspension and stirring at r speed, conduct the first color halo test on the filter paper. That is, use a glass rod to dip a drop of suspended liquid on the filter paper. The droplet forms a ring on the filter paper, with the aggregate sediment in the middle. The amount of solution should be such that the diameter of the sediment is between ~. It is surrounded by a colorless water ring. The test becomes positive when a light blue halo with a width of about 10 Å radiates from the edge around the sediment.
() If the methylene blue for the first time does not cause a color halo around the precipitate, add the methylene blue solution to the suspension, continue stirring, then use a glass rod to take a drop of the suspension, and add On the filter paper, conduct a second color halo test. If there is still no color halo around the precipitate, repeat the above steps until a stable light blue color halo of about 100% radiates around the precipitate.
() Stop adding the methylene blue solution dropwise, but continue to stir the suspension, and perform a color halo test each time. If the color halo disappears in the first few seconds, add methylene blue solution again. If the color halo disappears in the first few seconds, add methylene blue solution again. In both cases, stirring and halo testing should be continued until the halo is sustainable.
() Record the total volume of methylene blue solution added when the color halo continues, accurate to the nearest.
, Rapid evaluation test of methylene blue
() Prepare samples and stir according to the requirements of three () and three ().
() Add methylene blue solution to the beaker at one time, stir continuously at r speed, then stick a drop of the suspension with a glass rod, drop it on the filter paper, and observe whether there is an obvious color halo around the precipitate.
Determination of the methylene blue value B of the particle size part smaller than . ..
Determine the mud content or stone powder content in fine aggregates according to the sifting and washing method.
Stone powder content meter calculation
The methylene blue value B of fine aggregate is calculated according to formula (), accurate to.
B
In the formula: B methylene blue value (), represents the grams of methylene blue consumed per kilogram of ~. particle size sample, the mass of the sample () and the methylene blue solution added Total amount ()
, methylene blue rapid test result evaluation
If there is an obvious color halo around the precipitate, the methylene blue rapid test is judged to be qualified. If there is no obvious color halo around the precipitate, then the methylene blue rapid test is qualified. The methylene blue rapid test was judged to be unqualified.
, less than . part or the methylene blue value B of mineral powder is calculated according to formula (), accurate to.
B
In the formula: B methylene blue value (), represents the number of grams of methylene blue consumed per kilogram of ~. particle size or mineral powder sample mass () of the methylene blue added to the sample The total amount of solution ()
, the mud content or mineral powder content in the fine aggregate is calculated and evaluated according to the method.