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Product Description:


1,Dry Sieve Test Apparatus
2,To determine the apparent/equivalent opening size of a geotextil


Geotextile Opening Size Tester is used todetermine the apparent/equivalent opening size of a geotextile by sieving sizedglass beads through the geotextile, using the dry-sieve principle. A geotextilespecimen is placed in a sieve frame and sized glass beads are placed on thegeotextile surface. The geotextile and frame are shaken laterally so that thejarring motor will induce the beads to pass through the test specimen. Theprocedure is repeated on the same specimen with various sized glass beads untilits apparent opening size has been determined. The apparent opening size (O90)of the geotextile corresponds to a specified size of graded glass beads passed(d90).

Related Standards


ASTM D4751

Note: this geotextile opening size tester can conform to but not limit toall the standards above, for more standards conformance, please contact us.


1         Mechanical sieve shakervibrates smoothly and efficiently;

2        Two vibration mode: lateral andvertical;

3        Vibrating time is settable;

4        Time is displayed by Digitron.

Key Specifications

Inner diameter of sieves


Sieve material

Aluminium casting

Number of sieves


Superimposed height of sieves




Timer range


Lateral vibration frequency


Vertical vibration frequency


Radius of gyration


Power supply

380V three-phase


660×400×880mm (L×W×H)



Model NO.

DW1330D Dry Sieve Test Apparatus

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Q:What is the reason for the vibration of the fan?
Fan inlet and outlet pipe design is unreasonable, causing resonance,
Q:What is the use of two-speed fan?
As the basement by the underground conditions and space constraints, to meet the air volume and wind pressure and other parameters of the conditions, the fire exhaust system and the usual ventilation can be combined
Q:What is the working principle of centrifugal fans?
The pressure generated in the centrifugal fan is greatly influenced by changes in the inlet temperature or density. For a given intake air volume, the maximum intake air temperature (lowest air density) produces the lowest pressure. For a given pressure and flow characteristic curve, there is a power and flow characteristic curve. When the blower runs at constant speed , The required power increases with a decrease in the intake air temperature for a given flow rate.
Q:How to change the fan flow ah?
Bypass adjustment, suitable for Roots blower (volumetric fan);
Q:What is the difference between a jet fan and an axial fan?
The guide vanes change the deflected airflow into axial flow and introduce the gas into the diffuser tube, further converting the kinetic energy of the gas into pressure energy, and finally introducing the working line. Axial fan blades are generally adjustable angle, most of the axial fan are equipped with a set of blade hydraulic regulator.
Q:How does the material of the high temperature fan choose?
According to the use of the fan and the use of different conditions, in the choice of materials should take into account the media corrosion, the temperature of the medium, the amount of gas emissions, explosion-proof and the choice of materials, such as the economic requirements.
Q:What is the role of axial fans and centrifugal fans in mechanical ventilation?
1 due to the difference between temperature and food temperature, the first ventilation time to be selected in the day to reduce the grain temperature and temperature gap, reduce the occurrence of condensation. After the ventilation as far as possible in the evening, because the ventilation is mainly cooling, the evening the atmosphere is relatively high humidity, low temperature, which reduces the water loss, and make full use of the low temperature at night to improve the cooling effect The
Q:What are the characteristics of high-pressure axial fans?
3. Installation is easy to install, can be installed and used at any time for compressed air or for vacuum, can also be installed in the horizontal or vertical direction
Q:How to install the axial fan?
2, to see how much air flow fan you need, and the fan inlet and outlet also need to receive air duct? If you need to know the length of the duct, and see the duct is straight pipe or elbow, three links (such as more elbow, three links, etc. need to increase the wind pressure);
Q:What is the role of the blower in the sewage treatment plant?
The blower is eccentricized by the rotor biased in the cylinder and causes the volume change between the blades in the rotor slot to suck, compress and vent the air.

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