I. Overview
       DKZ porous ceramic pore diameter analyzer applies to the determination of the maximum the porous ceramics pores pipeline GB/T1967-1996 "porous ceramic pore diameter test method. The main instruments for gas cylinders, electrical control box and specimen holder of three parts, using precision low-range digital manometry system, accurate measurement of the test pressure value. The test gas is air or nitrogen; sample fixture applicable in the section of the cylindrical specimen fixture to ensure during the test gas only through and not leaked from the edge of the sample from the sample pores.
Second, the principle
      The principle of the present method is the use of gas bubble pressure method, by capillary action, the determination of the size of the aperture as measured by the membrane pore size, wetting agents, surface tension effects. Principle known, by capillary action when the radius r of the capillary wetting surface tension σ of Liquid A, the capillary liquid relative pressure P2, and the vapor pressure P1 (liquid B for vapor phase) reaches static equilibrium, P2, P1 relationship by the Laplace equation:
ΔP = P2-P1 = 2σcosθ / r its flat θ is the contact angle (cylindrical contact angle is 0)
The capillary liquid will be removed when the holes at both ends of the pressure is greater than 2σcosθ / r gas bubble pressure method is to be noted in this principle of determination of the pore size of the porous material. Actual measurement process, it is known that the surface tension of the liquid is insufficient (saturated) wetting the porous ceramic material of holes (vacuum or boiling), the pressure at the end of the fixed porous material and the other end with air or nitrogen pressure difference is generated. When the pressure difference is large to a certain value, the maximum pore size of the porous material is first open aperture by formula calculation.
        Third, the main technical parameters
1, the flow measurement range: 6ml ~ 3600ml/min
2, the test pressure is adjustable from 0-2MPa
3, digital pressure gauge measurement accuracy: ±% ℅, units of measurement Pa
4, the standard sample specifications: Diameter: Ø30 ± 0.5mm
5, power supply voltage: 220V 50HZ