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Laser diffraction sensor HELOS/BR with measuring zone for the insertion of dry / wet dispersers or sample couplers for particle size analysis from 0.1 µm to 875 µm (to 8,750 µm with HELOS/KR, HELOS-VARIO/KR).

Technical specifications and dimensions.

HELOS, the well proven laser diffraction sensor is the first system using one measuring principle (laser diffraction in the parallel laser beam) for the whole measuring range from 0.1 µm to 8750 µm. Two evaluation modes are offered: FREE: a parameter free solution basing on Fraunhofer diffraction and MIEE: basing on precision Mie theory extended to the full size range, as an option. The combination of measuring ranges is available for both, allowing the analysis of extremely wide size distributions at highest precision.

It is the classical instrument for particle size analysis of dry and wet samples, i.e. of powders, suspensions, emulsions or sprays. It is entirely built to the specifications of ISO 13320 "Particle size analysis - laser diffraction methods" - and designed for absolute precision measurements to typically ±1% deviation with respect to the standard metre.

High resolution and guaranteed reproducibility, combined with high speed data acquisition, network interface and the standardised WINDOX software supporting all Sympatecs instruments, result in superior solutions.

The HELOS analysis system with its modular configuration and in combination with appropriate dispersing units adapts in an ideal way to the products to be analysed.

Highlights of HELOS
(Helium-Neon Laser Optical System)

HELOS represents a family of laser diffraction sensors, which are all built to the same high quality standards. Members of the family are:

Model1 Measuring range Application
0.1 - 875 µm
off-line / at-line
0.1 - 8750 µm
off-line / at-line
0.1 - 8750 µm
off-line / at-line
0.25 - 3500 µm
on-line / in-line

Outstanding performance characteristics common to all HELOS sensors:

One measuring principle for the complete size range from 0.1 µm to 8750 µm,
in a parallel laser beam of 632.8 nm, fully compliant with ISO 13320.
Absolute accuracy is typically within  ±1% with respect to the standard metre.
Up to eight measuring range modules are selected by software, each using a specially designed
(Fourier-) objective for highest precision and resolution of the particle size distribution.
Modular design structure for best adaptation of the sensor to the analysis of powders, suspensions, emulsions, aerosols and sprays with specific dispersing units.
Precision semicircular (180°) multi-element photo-detector with auto-alignment for optimum acquisition of the diffraction patterns, especially of non-spherical particles.
Automatic adaptation of the beam diameter to the measuring range allowing for largest working distances, which is important e.g. for the measurements of extended aerosols etc.
Evaluation of particle size distributions withFREE (Fraunhofer Enhanced Evaluation):
Fraunhofer theory (applicable without knowledge of optical parameters) down to 0.1 µm or
  • MIEE (Mie Extended Evaluation):
    Mie theory (for spherical, isotropic, homogeneous particles with known complex refractive index,
    as an option) for 0.1 to 8750 µm
  • Combination of Measuring Ranges:
    two to eight measuring ranges can be combined to a single particle size distribution (as an option).
WINDOX 5 software for control of the instruments and evaluation of particle size analysis data:
  • one software supports all off-line, at-line, on-line, in-line instruments,
  • data base oriented, multi-sensor capable, designed for > 106 HELOS measurements,
  • compliant with 21 CFR rule 11.
  • permanently 2000 particle size distributions per second are acquired,
    used integral or in the integrated time resolved mode at a defined sample frequency
  • use of statistical information to improve the inversion algorithm

Rigid full metal housing with integrated precision optical bench allowing for the operation of the sensor in any orientation, i.e. upside down for spray applications or even vertical.

  • fast change of measuring ranges


  • TCP-IP interface with concurrent communication to all sensor components and external devices
  • system set-up via built-in web-interface
  • control of special devices via aux-in/out and ZigBit™ wireless network

2For the specifications of MYTOS please refer to MYTOS.

Particle size analysis with laser diffraction
0.1 µm - 8,750 µm

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HELOS/KR for the size range of 0.1 to 8750 µm


HELOS/BF with dry / wet disperser combination OASIS
HELOS-VARIO/KR for the size range of 0.1 to 8750 µm mounted on a flexible optical bench rail; preferably applied for spray analysis.

Dry & wet dispersion

HELOS/BF with dry / wet disperser combination OASIS
HELOS/KR with dry / wet disperser combination OASIS/L and dosing unit VIBRI/L

Dry dispersion

RODOS with dry disperser RODOS and particles "glowing" in the laser beam
HELOS/BR and dry disperser RODOS with feeder VIBRI/L

HELOS/KF with gravity disperser GRADIS, the lens revolving unit is visible inside the housing
HELOS-VARIO/KR with gravity disperser GRADIS/L and VIBRI/L

Wet dispersion

HELOS and wet disperser QUIXEL for hig speed anylsis of suspensions and emulsions
HELOS/KR with advanced wet disperser QUIXEL

HELOS and wet disperser SUCELL
HELOS/BR with classic wet disperser SUCELL

HELOS and CUVETTE SM/US for the anylsis of very fine suspensions and emulsions
HELOS/BR and wet disperser CUVETTE 50ML/US for small sample quantities

Spray Applications

HELOS and wet disperser QUIXEL for hig speed anylsis of suspensions and emulsions
HELOS/BR with sample coupler for spray applications SPRAYER

Former HELOS Version

1Specifications of the former HELOS/F.

symbol: laser diffraction