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FPA 1000
Process UV Spectrophotometer |
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TYTRONICS®
FPA 1000/1100 SERIES
FeaturesThe FPA Spectophotometer Series uses well-established spectrophotometric techniques of analysis. Energy from a source lamp (Tungsten for VIS and VNIR, and a suitable arc source such as a Mercury Pen-ray lamp for UV; other UV sources available, dependent on application) is transmitted to the sample cell via a multistranded fiberoptics bundle. The return is bifurcated to facilitate the dual wavelength operation. The electronics and photometric assemblies are contained in a purgeable NEMA-12 enclosure. For the UV analyzer, the light source is housed in a separate attached enclosure. This enclosure can be upgraded to NEMA 4 and NEMA 4X stainless steel. Enclosures can also be purged to meet Class 1, Division I or II requirements, as well as ATEX Zone 1 and 2. Fiberoptics link the sample cell to the light source and detectors. Standard cable length is 12 feet, but optional extension is possible. Two types of sample cells can be provided - a pipeline (Fig. 1) and a fast loop by-pass cell (Fig. 2).
The standard signal outputs include 3 isolated 4-20mA and RS-232C printer ports. Concentration alarms are fullscale programmable. Remote control via a Programmable Logic Controller (PLC) is possible either through bi-directional RS-232C port or digital inputs. The analyzers can be combined with a sample system to provide many additional features such as automatic calibration of zero and span, as well as wash cycle. Automatic control of external calibration devices may be achieved with our optional digital interface relay card. WAVELENGTH The instrument uses two band pass filters for wavelength selection, one for measure
wavelength and the second for reference wavelength. The measure wavelength is selected
in a region in which the component being analyzed absorbs strongly. The reference
wavelength is selected in a region where the sample absorbs weakly or not at all. The
analyzer measures the light intensity at two wavelengths to calculate the concentration using Beer’s Law 1 expression.
CELL The analyzer may be configured to operate with two types of optical cells (see Figs. 1 and 2), pipeline or a fast loop by-pass. The by-pass cell can be constructed of Kynar® or 316 stainless steel. These standard cells are pressure and temperature rated for 350 psig and 200°C. Cells can be engineered for higher temperatures, pressure ratings, and chemically compatible materials. Cell pressure and temperature sensors are options that allow the instrument to automatically compensate for changes in the sample gas pressure and temperature. The optical cell can be mounted in an oven to heat the sample to avoid condensation or crystallization of sample, or to simply stabilize sample temperature. Pipeline cells can be supplied with flanges to fit 1/2”, 1”, or 2” sample lines. The pipeline cell can be provided with pathlengths from 0.5 to 10 cm. The by-pass cell can be provided with pathlengths from 0.25 cm to 50 cm. DETECTOR The detector circuitry is designed to achieve maximum reliability and performance at an affordable price. The detectors are silicon photodiodes, are unaffected by external vibrations, and require no alignment during installation or maintenance. They are also thermostatically controlled to provide a stable measurement by eliminating drift. REMOTE SENSING FOR SIMPLE INSTALLATION The pipeline cell mounts directly into the process which avoids the need for a separate sampling system in many applications. The fast loop by-pass cell is rated for the sample temperature and pressure. There are no electrical connections at the cell avoiding explosionproof requirements at the sample point. The cells require no optical alignment at installation or after routine maintenance. This further aids rapid installation and greatly eases maintenance by plant personnel. OPTICS DESIGN FOR MAXIMUM STABILITY The photometer is based on a single beam, dual wavelength technique whereby the measure wavelength is directly compared to a reference wavelength. Dual wavelength design automatically compensates for bubbles, particulate matter, turbidity, and variations in light intensity. Sample conditioning may be required for special applications such as oil-in-water; where particulates may absorb the oil it is necessary to homogenize the sample using a static mixer. LOW MAINTENANCE/HIGH RELIABILITY No moving parts are used in the photometer design, assuring high reliability and exceptionally low maintenance, thereby achieving uptime efficiencies of greater than 98%. The optical windows can normally be cleaned by passing an appropriate solvent through the sample cell. Automatic calibration may be implemented using external standards; the instrument may be programmed to execute periodic calibrations, further guaranteeing continuous accuracy and, where required, meeting environmental agency requirements. Automatic lamp failure detection is flagged on the front panel and can also be transmitted via serial and digital output or 4- 20mA current loop. The result is that operators stay informed and in control, leading to greater operational time and cost savings. Click here for a list of the applications of the FPA 1000/1100
Click here for the complete brochure on FPA 1000/1100 SERIES (PDF - 912K) Click here for the Application Sheet (PDF - 43K)
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