VIS-NIR Dual-Beam Photometer for Long-Term & Stable Operation

About Guided Wave’s ClearView Dual Beam Photometer

As the first commercial available true dual-beam (db) filter photometer, Guided Wave’s ClearView db photometer offers users an impressively low cost solution without compromising on its performance capabilities.

Equipped with Guided Wave’s unique dual-beam optics that have been proven for their long term and stable operation, the ClearView db photometer also comes with a series of highly flexible configurations that allows this tool to meet many online analysis requirements for liquid and gas process streams.

Some of the typical applications of the ClearView db photometer include:

  • Color – ASTM or saybolt in fuels
  • OH (hydroxyl) number for polymer reaction end point
  • Water content in solvents
  • Haze present within diesel fuel
    • Also capable of analyzing the presence of turbidity
  • NaOH in water

ClearView db Benefits

Some of the unique benefits that are specifically associated with the ClearView db photometer include:

  • Stable dual-beam design
    • Because of this lamp, drift is dramatically reduced
    • Ensures long-term performance
  • Several enclosure options
    • Reduced installation costs
  • Six filter positions
    • Allow users to perform multi-parameter analysis if necessary
  • Optional second sample channel
    • Reduces overall cost for each sample point
  • Optional turbidity monitoring
  • Compatible with a wide range of flow cells and insertion probes
  • Low maintenance
  • Long life Tungsten-Halogen Lamp
    • Approximately 4,000 hours
  • Dual-beam performance
    • Increase functional time between required probe cleanings

Principle of Operation

The basic functional principle of photometry involves measuring the intensity of light. Although light intensity changes can be observed on various levels, they typically occur as a result of interactions between different materials. To further explain this concept, the Beer-Lambert Law is a useful theory that describes the relationship that exists between light and matter.

Furthermore, the Beer-Lambert Law states that matter absorbs light in measurable amounts at specific wavelengths, during which the degree of absorption is directly related to the concentration of matter that is exposed to the light across a known optical distance, which is otherwise referred to as its pathlength.

By understanding this concept, determining the chemical concentrations and physical characteristics of a process stream sample can be accurately analyzed. Effective analyzer design takes this principle into consideration by powerfully exploiting the science to achieve a high level of process control.

Each successful ClearView db application is defined by the calibration, which typically consists of absorption data that is directly related to the analytical values that describe the state of the process streams. Specific wavelengths for any given application can be represented by the filters that have been installed into the photometer.

In the situation that any changes occur during this process, the ClearView db measurements will instantly reflect these changes to provide users with highly accurate measurement results.

Complete Analyzer System

The three main components of the ClearView db analytical system include:

  1. Photometer
    1. Transmits both the source light and quantifies the light that has not been absorbed by the sample
  2. Fiber optic cables
    1. Carry light from the photometer to the sample and back
    2. Ensures that the sample interface can be located from as far as 100 meters from the photometer
  3. Sample interface
    1. The ClearView db is compatible with an extensive selection of Guided Wave sample interfaces that are both rugged and highly efficient, thereby allowing photometry to be successfully achieved in even the harshest environments.

Product Specifications

  • Design: Fiber Optic Dual-Beam Photometer
  • Number of Channels:
    • One sample channel
    • Optional second sample channel
    • Optional turbidity monitoring for first channel only
  • Number of Detectors/Filters:
    • Two to six, of any combination of detector types except 3 xInGaAs max
  • Filters:
    • Depends upon the customer’s specific requirements
    • Maximum of six individual filters available
  • Detector Types:
    • Si (450 nm – 1050 nm)
    • InGaAs (800 – 1650 nm)
    • xInGaAs (1000 – 2150 nm, TE cooled), max 3
  • Light Source:
    • Tungsten-Halogen
    • Approximately 4,000 hours
  • Spectral Range: 450 – 2150 nm
  • Photometric Noise: <50 μAU 450-2100 nm 1-minute rms
  • Photometric Drift: <500 μAU rms/ °C
  • Wavelength Drift: Property of filter
  • Response Time: One second, minimum. User settable
  • Fiber Size: 400, 500, or 600 μm diameter, single strand
  • Fiber Type Fused Silica: Ultra Low-OH (optimum range: 450 nm - 2150 nm)
  • Fiber Connectors: SMA 905
  • Outputs (analog):
    • Up to six for a one channel unit
    • Up to four per channel for a two-channel unit
    • 4 – 20 mA, customer powered
  • Outputs (Discreet):
    • Up to six for a one channel unit
    • Up to four per channel for a two-channel unit
    • Contact closures
  • Inputs (analog):
    • Four (optional) 4 – 20 mA, isolated grounds
  • Local Display:
    • LCD Touch Screen
    • Color QVGA
  • Communications: Ethernet (TCP Modbus) standard
  • Enclosures:
    • General Purpose NEMA 4
    • Class I Division 2, Z-Purge, NEMA 4x
    • Class I Division 1, IECEx, ATEX
  • Power: 24 VDC, 3 A
  • Environmental:
    • 0 – 45 °C, 0 – 90%, sun and rain sheltered
  • Dimensions:
    • GP – 14”x 12”x 6” [36 cm x 31 cm x 15 cm]
    • CID2 – 16”x 20”x 6” [41 cm x 51 cm x 15 cm]
    • Explosion proof – 16”x 17”x 10” [41 cm x 43 cm x 26 cm]

ClearView db Enclosure Options

Z-purge Unit Class I, Division 2
ExProof Unit Class I, Division 1, IECEx, ATEX
General Purpose Unit

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