High-precision particle counter | high-precision electronic automatic particle counter | weighing electronic automatic particle counter

　　High-precision particle counter | high-precision electronic automatic particle counter | weighing electronic automatic particle counterWorking principle:
The electromagnetic vibration box causes seeds to be queued and fed one by one, forming photoelectric pulses after falling into the photoelectric conversion tank. After amplification, shaping, and inversion, they are sent to the counting circuit and displayed on an LED digital tube for reading. The preset dial switch stops feeding and counting when the preset number is reached. The electronic automatic particle counter is equipped with a self calibration frequency, which facilitates checking the correctness of the counting circuit and preset settings.
1. Electromagnetic vibration feeding device: The seeds are placed on the tray, and the hopper is spiral shaped.
2. The seeds rising in the spiral groove reach the feeding port and fall down. They are projected onto the silicon photovoltaic cell through the photoelectric conversion area to generate current changes. After pulse amplification and shaping, the photoelectric counting pulsation is obtained and sent to the counting circuit for counting display.
3. The counting display circuit adopts CC4518 (HEF4518 from Philips) dual BCD counter, and uses CC4511 ("HEF4511") BCD-7 segment latch/decode/driver to decode and drive the common negative LED display. The four digit LED input terminal is connected in series with a current limiting resistor to ensure uniform stroke brightness. The CC4518 counting input terminal has a clock terminal (CL), a clock enable terminal (EN), and a reset terminal (R). When the single digit number is EN="1" (high voltage level), the counting pulse is input by "CL" and triggered by a positive jump. The last three bits are all CL="0" (low level), input by EN and triggered by a negative jump.
4. The control signal of the preset self stop circuit is connected to the NAND gate at the four input terminals through a switch diode, a dial switch, and a finger wheel. When the preset number of the dial matches the counting number, the relay is activated to cut off the counting input, ground the counting input terminal, stop feeding, and the LED displays the preset number.

High-precision particle counter | high-precision electronic automatic particle counter | weighing electronic automatic particle counterTechnical Specifications:
Particle range: Small and medium-sized sample particles: 0.7~4mm × 0.7~12mm
Large sample particles: 3~10 × 3~12 mm
Counting accuracy: 2/1000 for large and medium-sized particles
Small particles: 4/1000
Counting speed: ≥ 1000 grains/3 minutes (this parameter is calculated based on the slower speed of 2nd gear. If you want faster speed, you can adjust it to 3rd to 7th gear)
Counting capacity: Five digits 1~99999
Power supply: 220V 50HZ
Continuous working time: ≥ 5 hours.

Functional features:
1. Microcomputer automatic control, membrane type buttons, * automated operation; LED displays set and actual numbers.
2. Adjustable counting speed, no noise, high accuracy; The whole machine has a metal shell, which is novel, beautiful, and sturdy in appearance.
3. It has functions such as circuit self-tuning, adjustable speed, setting viewing, arbitrary counting, preset self stop, etc; Both circular and elongated seeds are suitable.
4. The feeding port adopts a spring plate to automatically adjust the feeding gap, without the need to replace the feeding tray. Adjustment range of gap between feeding ports: 1mm~12mm.

Model List: