ME809 Particle Counter Send email to us

    During sensor operation, liquid samples flow upward through the sample introduction glass slit due to negative pressure siphoning. The optical lens collimates the laser beam, which then vertically enters the center of the sample introduction glass slit and travels through the horizontal detection slit to the photodiode. When no particles pass through the sample, the photodiode outputs a maximum constant photocurrent. When a particle momentarily traverses the beam, its obstruction reduces the optical power reaching the photodiode, causing the photodiode to output a negative pulse current. The amplitude of this pulse is proportional to the projected area of the particle along the beam direction. This principle underlies the light-blocking method for detecting insoluble particles in liquid samples.
    During instrument sampling, the three-way diverter valve rotates to the sampling position. The high-pressure injection pump activates, propelling the sample through the sampling needle and into the injection slit. Particles within the sample block the laser light source, triggering an electrical signal at the photodetector. This signal is amplified and processed by the acquisition system to determine particle size and count, then transmitted to the microcontroller. The microcontroller manages the control system, display, printer, and keyboard. After sampling completes, the three-way diverter valve shifts to the discharge position. The high-pressure injection pump operates, expelling the sample into the waste (backflush) cup. During backflushing, the three-way diverter valve returns to the discharge position. The high-pressure injection pump operates, flushing the backflush fluid from the waste (backflush) cup through the sample inlet slit to clean it.

1. Measurement Range: 0.8 µm to 600 µm
2. Measurement Channels: 64 channels, particle size freely configurable
3. Sampling Volume: 0.2 mL to 6553.5 mL
4. Sampling Speed: 5 mL/min to 80 mL/min
5. Resolution: ≤10%
6. Overlap error limit: 24,000 particles/mL
7. Maximum positive pressure of pressure chamber: 0.8 MPa
8. Maximum negative pressure of pressure chamber: 0.08 MPa
9. Data output: Built-in printer and RS232 interface
10. Viscosity measurement range: 0–50 cSt (optional)
11. Water activity: 0–1 aw (optional)
12. Water content: 0–360 ppm (optional)
13. Power supply: AC 220V ±10%; 50Hz; ≤200W
14. Ambient temperature: 0–60°C