HMK-22 Fisher Sub Sieve Sizer has been developed to measure the average particle size of powdered materials. While Air Jet Sieve and Laser Particle Size Analyzers from AimSizer measure size limits and particle size distribution, respectively, this equipment uses an air-permeation method to measure the average particle size of powders. The sieve sizer has a standard tube, reading chart, sample tube, pressure regulator, airflow tubing, pressure gauge, electronic air pump, dryer, porous plug, needle valve, and rack.
The instrument has several advantages: It enables results comparison by referencing industry standards for standard tube values. It uses soft silicone to connect the ends of the sample tube, rather than hard rubber pads. This prevents air leaks, provides superior sealing, and reduces the need for pad replacement. It also enables users to determine particle size directly from the reading board in micrometers.
Airflow tubing uses durable silicone tubes instead of latex tubes, minimizing the need for replacements. Pressure gauge and regulator use acrylic materials instead of glass, preventing breakage. A clear view of the dessicant allows for timely replacement. The electronic air pump enables a quieter and more stable output pressure and is durable when compared to conventional mechanical pumps. Precise airflow control is achieved with an American-style needle valve. The instrument adheres to international standards ASTM B330 and ISO 10070.
Specifications
- Measurement range: 0.2-50 μm
- Accuracy error: < 3 %
- Repeatability error: < 3 %
- Operating voltage: 220 V/50 Hz or 110 V/60 Hz
- Instrument dimensions: 41.8 cm W × 24.6 cm D × 73.7 cm H
- Porosity range: 0.25-0.95
- Current: 0.3 A (30 W)
- Instrument weight: 18 kg
To determine the powder particle size, the sample is first compressed in the sample tube as per the height curve of the reading board and the porosity of the powder. The tube is then placed in the testing area, where a stable airflow is generated by an electronic air pump. A pressure-stabilizing tube and a dryer regulate and dry the airflow, respectively. The air then moves upwards within the tube, through a filter paper, porous copper plug, and the sample. It reaches a U-shaped manometer, causing the water level to rise.
By aligning a parallel pointer with the water level and referencing the curve on the reading board, the particle size of the powder can be directly determined. The powder’s particle size influences air permeability, which directly affects the manometer fluid height, indicating that different particle sizes yield different fluid values.