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Photometry Applications

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    Test Kits and Photometric Methods for agriculture, in food or water analysis

    When analyzing water and food, trust plays a very important role. Only careful analysis using tests that are performed correctly and are delivering sound results will help to maintain and improve our quality of life. With ready-to-use tests and test systems from Merck Millipore, you can trust your results. Our broad product range covers everything from water analysis to the control of production process up to the measurement of special food parameters.

    By Merck KGaA, Darmstadt, Germany based in Darmstadt, GERMANY.

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    Determination of the chemical oxygen demand (COD) in water

    Introduction

    Chemical Oxygen Demand (COD) is one of the most common integral indicators of anthropogenic pollution of water bodies. COD is widely used in the analysis of natural water, to control wastewater treatment from organic various substances.

    By Lumex Instruments Group based in Mission, BRITISH COLUMBIA (CANADA).

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    Tunnel solutions for the light sensors

    According to the International Committee on Illumination CIE recommendations, luminance should be monitored as the luminance contained within in a conical field of view, subtending an angle of 20º. It is recommended that a luminance photometer is mounted in the tunnel approach road approximately 120 - 200 metres from the portal, depending on the approach speed of the vehicles and their stopping distance. The purpose of monitoring the luminance at the portal is to adjust the level of light intensity inside the road tunnel to the light intensity outside so that drivers do not have to adjust their eyes quickly or become affected by the “black hole” effect where they decelerate rapidly and become a hazard to other road users.

    By Codel International Ltd based in Bakewell, UNITED KINGDOM.

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    Instruments and analyzers for measuring spectral irradiance

    Spectral irradiance is the irradiance of a surface per unit frequency or wavelength. spectral irradiance of a wavelength spectrum is measured per watts per square metre per nanometre (W·m−2·nm−1). Spectroradiometers are devices designed to measure the spectral power distribution of a source. From the spectral power distribution, the radiometric, photometric, and colorimetric quantities of light can be determined in order to measure, characterize, and calibrate light sources for various applications. Spectroradiometers typically measures the spectral irradiance and spectral radiance. Spectroradiometers systems work without the need to be connected to a PC. This makes them highly portable while maintaining the accuracy of a spectrometer.

    By EKO Instruments based in San Jose, CALIFORNIA (USA).

  • Water quality monitoring systems for portable water plants

    Low maintenance and reliability are key requirements for analyzers in potable water plants. Cost of ownership is another big issue.

    By SWAN Analytische Instrumente AG based in Hinwil, SWITZERLAND.

  • APHA Color #3020

    Measurement of APHA color either on-line or in a laboratory setting using a photometer. Background: APHA is sometimes referred to as the Platinum Cobalt (Pt/Co) or Hazen scale. Also referred to as a “yellowness index”, the APHA color scale is a common method of comparison of the intensity of yellow-tinted samples to assess the quality of liquids that are clear to yellowish in color. Originally developed to determine the purity of municipal water supplies, it is now used as a metric for purity in the water, chemical, oil, plastics, and pharmaceutical industries. APHA color quantifies the appearance of trace amounts of yellowness, which is a visual indicator of product degradation due to exposure to light or heat; the presence of impurities and negative effects of processing. As such APHA color is often used as a product release specification. APHA is a single number yellowness index. The units are based on a dilution of a 500ppm solution of PtCo.

    By Guided Wave, Inc. based in Rancho Cordova, CALIFORNIA (USA).

  • ASTM Color (0-7) #3070

    ASTM color is an important product quality measurement for many refinery and petrochemical processes. The purpose of this application note is to determine ASTM (D1500) color with the ClearView db fiber optic photometer for real-time ASTM color measurement from 0-7. Quantify yellowness for product quality measurement for many refinery and petrochemical processes. Get results in real-time (seconds). Use for ASTM and other parameters in complex streams. Detect potential cross-over contamination in fill or supply lines in real-time. Gain significant improvements in process control. Guided Wave's in-process NIR analyzer will determine ASTM (D1500) color in real time helping operators improve process control 24/7.

    By Guided Wave, Inc. based in Rancho Cordova, CALIFORNIA (USA).

  • Hydroxyl Number in Polyols (OH#) #3013

    The use of polymeric polyols is commonplace in the manufacturing of polyurethanes and other specialty polymers. The hydroxyl number (OH#) is a measure of the concentration of the hydroxyl groups on the polyol. This is an important parameter to monitor and control during polyol production. The laboratory method that is commonplace for hydroxyl number determination is both time consuming and involves the use of hazardous materials. This note will discuss the use of Guided Wave hardware and software tools for the measurement of hydroxyl number in polyols using fiber optic-based, Near-Infrared (NIR) spectroscopy. NIR can be applied in real time directly in process or as a laboratory procedure. In either case NIR is a time and money saving alternative to traditional methods. NIR also offers the benefit of increased safety over traditional methods. For well established process measurements, a Guided Wave ClearView® db multi-wavelength photometer can be used to achieve similar results.

    By Guided Wave, Inc. based in Rancho Cordova, CALIFORNIA (USA).

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