Seven Hills International Limited

Seven Hills Raman Analyser


On Line Raman Analyser

Raman Spectrometer
NEMA-4X_Enclosure

Seven Hills Raman instrument can be used in the laboratory or on-line for process control. The purged enclosure can be provided for Class I, Div 2 or Class I, Div 1 environments and is capable of providing either Z- or X- type purging.

The Raman instruments incorporate a frequency-stabilized, narrow-linewidth diode laser (patented); a temperature-controlled, optically fast ( f/2.0) fiber-coupled spectrograph (patented); a very low noise Andor CCD camera TE-cooled to < -80 OC; and Seven Hills Raman data acquisition and analysis software. The Seven Hills Raman software can be combined with GRAMS/AI9.1* for real-time chemometrics and process control applications.

This Raman instrument design offers very high signal levels while retaining high resolution (~ 4 to 5 cm-1 depending upon excitation wavelength). Patented optical design allows full (3.3 mm) height coverage of the 1024 x 128 pixel CCD chip and wide fiber array input (17 X 100 micron diameter fibers) while retaining a straight fiber array image and good resolution.

The system includes a fiber-coupled probe with laser band-pass and elastic light rejection (~10-8) filtering. With the 1200 grooves/mm grating, the spectral coverage is ~ 2100 cm-1 at 785 nm excitation. The grating is adjustable to allow use with excitation from 670 to 860 nm. The spectra can be exported in SPC or ASCII formats.

* GRAMS/AI8.0 is a registered trademark of Thermo Electron Corporation





Specification
Excitation Source
  • 785 nm Frequency-Stabilized, Narrow-Linewidth Laser.
  • Laser power (adjustable): 450 mW standard.
  • Higher power levels available - up to 1,500mW
  • Line width ~ 1.0cm-1.
  • Wavelength accuracy ± 0.1nm.
  • Wavelength repeatability (on/off) -< 0.15 cm-1 .
  • Wavelength stability -< 0.3 cm-1drift per week.
  • Laser lifetime -1 year warrenty (6 year projected lifetime).
  • Patented design
Raman Fiber-Optic Probe
  • Inphotonics Raman Probe-standard (other probes types available).
  • 200µm diameter excitation fiber, 400µm collection fiber.
  • Focal length - 5mm standard, 3 meter fiber-optic cable.
  • Rayleigh filtering built into probe tip (>8 O.D.).
  • System can accommodate most any Raman probe configuration.
  • Probes manufactured from 316-SS, carbon steel, alloy-20, hastelloy, etc.
  • Ball probes also available.
  • Lowest Raman shift that can be measured ~225 cm-1.
  • ATEX Zone 0 certified.
CCD Detector
  • Andor DU401-FI (standard) Higher performance CCD detectors available.
  • TE cooling to < -60° - 82° C for low noise applications.
  • Pixel size = 26 µm square and full range area of 128 x 1024 pixels.
  • Other CCD configurations available; e.g., 256 x 1024 pixels.
Spectrograph
  • Spectograph aperture: f/2.0.
  • Focal length: 135 mm.
  • Patented design
  • Diffraction grating: 1200 grooves/mm, ruled standard (other gratings available upon request).
  • Resolution: 4 cm-1with 785 nm excitation.
  • Spectral coverage: with 785 nm excitation ~2100 cm-1, with 830 nm
  • excitation the spectral coverage is ~1900 cm-1 .
  • Fiber-optic coupling: bundle-to-slit adapter with 100 µm fibers (17 fibers) in a linear input array (3.3 mm high) for coupling to spectrograph.
  • Temperature controlled: ~30° C for added stability.
  • Image curvature at exit plane: < 0.5 pixel over full height of CCD array.
  • User-adjustable center wavelength via rotating grating.
  • Built-in neon lamp for wavelength calibration.
Packaging
  • On-Line 19" rack mount dimensions (80" x 23" x 40"), weight ~ 430 lbs.
  • On-Line Purged enclosure rack mount (72" tall x ~ 28" wide x ~ 36" deep).
Multiplexing
  • Up to 18 channels with fiber switcher (17” x 17” X 10”), weight 55 lbs.
  • Insertion loss is less then 1 dB.
  • Switching time between channels is ~ 0.5 s.
  • Patented design
On-Line Instrument
  • Includes backup laser with an AUTO SWAP feature to automatically switch in the backup laser should the primary laser fail.
  • Includes a backup computer with hot swappable ARAID drives that can be quickly used if the primary computer should fail.
  • Lasers can be easily switched out with no user optical alignment.
  • Software features include automatic X- and Y-axis calibration, real-time chemometrics, and continuous laser tracking to ensure stable operation.
  • Backup features along with auto calibration ensure that there is minimal downtime (typically < 2 hours/year/channel).
  • Includes modeling for 1st year of use, model training at our facility.
  • Remote monitoring of system health available
System Software
  • Data collection with real-time chemometrics, laser frequency tracking, multipoint neon lamp absolute wavelength calibration, and throughput normalization features for chemometric model transfer capability.
  • Auto calibration features available
  • Interface with a DCS system, RS485, RS232, or TCP/IP.
  • Data files can be exported into ASCII and SPC formats.
System Stability
  • Amplitude stability ± 0.2 % over 24 hours after 30 minutes warm up.
  • Frequency stability ± 0.1 cm-1 over 24 hours after 30 minutes warm up
Power Requirements
  • 115 to 230 VAC, 47 to 63 Hz.
  • On-line 10 A

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