This general purpose filter photometer can be configured either for UV/VIS (250 - 1000 nm) or VIS/NIR (400 - 2150 nm) with 1 reference wavelength and up to 5 analyzing wavelengths in NEMA 4X, Z- or X-purge or ATEX enclosures. ChemView offers exceptional stability from patented optical and lamp feedback designs. Outlier detection. Simple or complex calibrations. Exceptional diagnostics and no-moving-parts for low maintenance.

Consider a ChemView photometer as an alternative where partial least-squares PLS chemometric models show less than five factors are needed. This encompasses a great variety of chemical measurements. Furthermore, photometers typically operate with multiple linear regression (MLR) or simple least-squares (LS) prediction models that can be generated in common spreadsheet programs by most instrument specialists or process engineers at the plant. As such they do not require chemometrics specialists for model maintenance. The models can be maintained at the plant level.

ChemView revolutionized process filter photometry since its introduction in 1997. Its main advantages are:

Compact size starting at 6 x 8 x 10" (NEMA. 5 analyzing and 1 reference wavelength. StabLamp stabilized light source with patented optical feedback . Extensive thermal stability for best analytical precision. Very low photometric drift of 1-2 mAU/2 weeks (equivalent to ±25 ppm water in a 2 cm optical path at 1900 nm.

NO-MOVING-PARTS for low maintenance (no spinning filter wheels and bushings to replace)

Simultaneous measurement of all wavelengths to reduce process "noise" ensuring that your reference wavelength relates EXACTLY to the analyzing wavelengths.

Simultaneous measurement of VISIBLE color and NIR composition (e.g. yellowness and acid number in resin melts.

SMART PHOTOMETER™ diagnostics to minimize guesswork in troubleshooting.

Can be up to 80 m from the flow cell or insertion probe using fiber optics,eliminating the need to pump explosive or dangerous liquids (phenol, HCN) or gases (Cl2, phosgene) into the analyzer. This means that your instruments specialists do not have to suit up to work with ChemView.

Can accept signals from RTD temperature sensors or pressure transducers to correct for variations in sample conditions.

ChemView's patented design uses a tungsten halogen lamp which is selected to match the size of the optical fibers. It is stabilized by a detector in an optical feedback loop (a pulsed Xe lamp is used for UV applications). Light is transmitted in a fiber optic cable to the sample cell, where it interacts with the sample. The remaining light is transferred back to the analyzer by a second fiber optic cable. It is divided among(up to) 6 detectors using beamsplitters and then passes through narrow bandwidth (6-15 nm wide) optical filters. We use Si and InGaAs detectors, such that light levels are not a problem. The detectors produce a voltage that is converted to log(voltage). The log(voltage) at each analyzing wavelength is subtracted from the log(voltage) at the reference wavelength, resulting in a voltage equivalent to units of spectroscopic absorbance. The reference wavelength is generally chosen in a spectral region that does not change with changing chemistry. 1 Volt = 1 Absorbance Unit or AU. From this point in the circuitry, ChemView is now an absorbance machine. Absorbance is proportional to chemical concentration in most instances. The powerful microprocessor applies the calibration coefficients to the absorbances, including sample pressure or temperature if needed, sums the results and outputs the predicted concentration. The output is displayed on the LCD screen, scaled and transmitted to the process control computer with self-powered, isolated 4-20 mA signals.

Optical Solutions' brand ClearView photometer was originally designed to provide a low-cost means to measure color and turbidity using the flexibility of optical fibers to separate the analyzer from the sample cell or probe. This had two advantages: One, ChemView can be supplied for NEMA 4X general purpose environments and explosion-proof in C1D1/2 or ATEX enclosures. Two,

ChemView's diagnostic features with fault alarms are extensive, helping the instrument specialist to determine: lamp replacement, window fouling, fiber breakage, sample cell failure, intermittent cloudiness or turbidity.

If there are no system faults, ChemView can further help in determining if the sample is an "outlier", that is, it does not "fit" within the calibration model. ChemView optionally has a patented chemical outlier detection (OutlierDetect) capability that can be trended or alarmed if the calibration uses 2 or more analytical wavelengths.

Lastly, ChemView can be provided with VirtualView, where an operator has access to nearly all menus, output scalings and calibration coefficients on a remote PC via local area network. This saves time in sending an instrument specialist to another building to check a specific reading on the LCD display or upgrading the prediction model with new coefficients.

Easy-to-Use Interface The operator will mostly see the following screens on ChemView, indicating how easy the system is to use.

The Measurement Mode Screen displays all answers.

The Absorbance Screen shows the absorbances at all wavelengths used in the Coefficient Screen to determine chemical concentration. The reference voltage is a key diagnostic.

The Coefficient Screen allows you to input coefficients for each wavelength, including sample temperature compensation, to convert absorbances to chemical concentrations.

The Analog Output Screen scales your 4-20 mA output in concentration units for each answer.

SPECIFICATIONS

Enclosures: NEMA 4x 304SS Class 1,Div. 1,2, Groups B-D (Z- or X-purge) 304SS ATEX (non-purged) powder-coat Al.

Dimensions: NEMA 8x6x10" (wxdxh) (20x15x25cm) 14.5 lbs, 6.6 kg C1D1/2 15x9x16" (wxdxh) (38x21x41cm) 40 lbs, 18.2 kg ATEX 24x20x31.8cm (wxdxh) 18.2 kg

Certifications: C1D1 NFPA 496, 1993, FM compliant CE ATEX II 2 EEx d IIC T6.

Purges: Expo-Safety Systems, continuous flow sub-miniPruge (1ZCFSS1S). Intrinsically safe switch closure and pneumatic "winkie" for purge loss. 1/2" NPTF purge fitting. Purge vent orofice is Size 1 (for 0.4 cfm; 10 L/min). Allow 6 min. purge cycle (min. 4 volumes) prior to power up.

Purge Gas: 110 p.s.i. clean, dry compressed air or inert gas.

Fiber Connections: SMA 905 400 - 600 micron (core).

Detectors: Max. 5 analyzing and 1 reference. Si for 250-950 nm InGaAs for 900-1650 nm TE-Cooled extended InGaAs for 1000-2150nm.

Filters: 10 nm FWHM for UV/VIS 15 nm for NIR typical 4 OD out-of-band blocking.

Light Source: Optical Solutions brand StabLamp, optical feedback circuit,Tungsten-halogen bulb, precision mounting for easy replacement. Approx 8 months bulb life nominal. Pulsed Xe lamp for UV/VIS. Approx 2 year bulb life.

Wavelength Drift: 0.1 nm with Si detector 0.2 nm near 1450 nm with InGaAs detector.

Photometric Drift: <2 mAU with ±5ºC variation (±2 to 3 mAU with Xe) 0.2 mAU/ºC at 0 AU typical <2 mAU over 2 weeks

Photometric Noise: <1 mAU (3 mAU with Xe source).

Outputs: 4 4-20 mA isolated, self-powered. 2 4-20 mAU additionally optional for a total of 6.

Environmental: 10 - 40 ºC, 10-90% rel. humidity (non-condensing).

Power: 110 - 240 V AC, 50-60 Hz, 70 VA (24 V DC, 2.1 A optional.