LS-909 is an excellent dry & wet laser particle size analyzer based on customers’ demands for high-performance instrument. LS-909 adopts international advanced long-focus optical detection system, optimized double backward & reverse scattered light detector array, upgraded ADC signal acquisition system and innovative self-adaption noise suppression algorithm combined with imported high-quality He-Ne laser emitter, which can satisfy the demands for wider-distribution particles’ measurement with high automation degree, large dynamic range, good reproducibility and resolving power. This instrument owns intelligent measurement & control analysis software, specialized user-defined measurement report templates, as well as easy operation of report browsing, report contrast and data export.
Main engine, dry & wet sample feeding system of LS-909
Applications: Measure the particle size distribution of samples have to be dispersed in liquid or of powders to be dispersed in gas.
Theory: Light is an electromagnetic wave. When light meets with particles on it way of traveling, the interaction between light and particles will result in deviations of part of the light, which is called light scattering. The bigger the scattering angle is, the particle size will be smaller, the smaller the scattering angle is, the particle size will be bigger. The particle analyzer instruments will analyze the particle distribution according to this physical character of the light wave.
Technical features
1. Reliable optical platform
LS-909 adopts all-in-one housing design, aluminium alloy base and modular construction design, it’s dust-protected, water-proof and it can prevent stray light from the outside. Debugging tool is used for the mutual alignment of the auxiliary detectors and main detector, which can help to obtain more accurate optical energy data of large angle, the performance of instrument for testing small particles will be improved.
2. Optimized single-lens optical path structure
Light path adopts lens back Fourier transform structure, which breaks through the restriction of Fourier lens’ pupil, the scattered light from all angles even backscattered can be positioned and be received by detectors; and the refracting surface and reflecting surface in the optical path of single lens are minimized, which can further reduce the background noise to the lowest level when the instrument works, the signal to Noise Ratio in the measurement will be improved.
Optical path schematic diagram
3.High-performance imported He-Ne laser emitter
Optical source adopts imported He-Ne laser emitter which owns better monochromaticity, high coherence, small divergence angle and good stability compared to other laser emitters, the optical quality is better, the device owns long service time as the preheating time is short.
OMEC imported He-Ne laser tube (left) VS general laser tube (right)
4. New design ofspatial filter & the patent ofintegrated laser emitter
We also adopt the patent design of integrated laser emitter (patent no.: 00228952.0) and new design of imported permanent magnet spatial filter which eliminates the effects from diffraction ring, combined with the stability test of laser output power and filtering smoothing technique which can get more accurate scattering light energy data, it can further improve the testing performance especially for large particles.
5. High-sensitivity photoelectric detecting array
LS-909 optimizes the photoelectric detecting array, the forward, side, large-angle, double backward and reverse detectors are included. All detectors are accurately placed on the focusing plane of Fourier, combined with large-angle, double backward and reverse detectors, which can realize perfect dynamic range, excellent resolving ability and sensitivity, accurate acquisition of optical energy information for small particles, the lower limit of measurement can reach 0.02μm.
6. Long-focus Fourier lens
LS-909 adopts 556mm long-focus Fourier lens, which makes the measurement window farther away from the plane of photoelectric detecting array, consequently, the scattering light signals of smaller scattered angles have enough space to be detected accurately, the recognition capability of the smallest scattering angle is 0.016°, the measuring capability for large particles can be enhanced, the upper limit can reach 2100μm.
7. Intelligent automated alignment
Intelligent software controls the automated alignment system, which ensures the accurate repeatability for repeated measurement. The accuracy can reach 0.5um, intelligent judgement for alignment function can avoid the deviation of measurement result compared with traditional measurement, the life of alignment mechanism can be longer.
8.Advanced data collection and processing technology
Using 8-channel simultaneous sampling to sample 18 bit ADC and sample & hold switch with ultralow leakage current, the full scale accuracy can reach 0.15%, the electric background is lower, combined with the offset function of electric background, it can help to get more accurate optical energy data, the resolving ability is also enhanced.
For detailed specifications, please contact EPC!
Enquiry:hkmarketing@epc.com.hk 
Whatsapp Enquiry: +85261990717
