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January 1, 2006

Analyzers

Measure more than pH with this non-glass meter

This multiparameter meter measures pH, temperature, conductivity, total dissolved solids and salinity. Featuring a stainless steel pH probe and solid-state conductivity electrode, the IQ170 (photo, far left) is NEMA4X rated and can withstand harsh conditions says the manufacturer. — IQScientific Instruments, Inc., Carlsbad, Calif.

edlinks.che.com/5825-431

 

This portable NIR spectrom-eter can be used in the field

The tecSpec near infrared (NIR) spectrometer is designed to fit in a compact enclosure and is suited for spectral data acquisition in laboratory, process and field environments. The instrument can achieve measurement rates of up to 1,000 spectra per second and offers maintenance-free operation using diode-array technology and thermoelectric cooling. The unit comes with a universal a.c.-input power supply and can alternatively be operated by 12 V d.c. Acquired spectral data are transferred to a computer via a USB interface. The tecSpec NIR 1.7 covers the spectral range between 960 and 1,690 nm and the tecSpec NIR 2.2 version allows for measurements in the range between 1,100 and 2,200 nm. — tec5USA, Inc., Plainview, N.Y.

edlinks.che.com/5825-432

 

These gas analyzers detect ppb levels in industrial settings

These industrial Fourier transform infrared spectroscopy (FTIR) systems provide real-time, multicomponent, extractive gas-phase analysis for applications including process optimization and control, industrial hygiene and research. The Titan gas analyzer (photo, middle) is packaged with externally mounted, corrosion-resistant gas cells. Cell pathlengths range from 1 cm to 30 m. Thermal isolation from the spectrometer allows operation from ambient temperature up to 240°C, which in turn allows moist sample streams to be analyzed without condensation. The Titan systems can achieve parts-per-billion (ppb) detection levels for a variety of compounds including formaldehyde. — MIDAC Corp., Costa

Mesa, Calif.

edlinks.che.com/5825-433

 

Capabilities of this analyzer

have been expanded

The Rosemount Analytical Model 700 (photo, top right) is a field-mountable process gas chromatograph (GC) that has been enhanced to include several new capabilities. A microflame-ionization detector (micro-FID) permits measurement of trace hydrocarbons in a variety of samples at ppb concentrations and is small enough to fit inside the explosion-proof housing of the unit. The micropacked methanator converts carbon monoxide and carbon dioxide to methane and permits trace quantity measurements of these compounds in polymer-grade chemicals. A heated liquid-sample inject valve expands the analyzer’s capability to measure liquid hydrocarbon samples, especially sample streams prone to polymerization, such as styrene and dicyclopentadiene. The Flame Photometric Detector (FPD) module allows the analyzer to trace sulfur compounds with sensitivities typically better than 50 ppb. Each Model 700 chromatograph unit is tested in an environmental chamber at temperatures of 0–130°F to ensure reliability in field applications. — Emerson Process Management, Rosemount Analytical,

Solon, Ohio

edlinks.che.com/5825-434

 

Get Karl Fischer titration

results easily

This titrator has six built-in calculation modes to accommodate solid, liquid and gas samples and includes a statistics package. With balance and computer interfaces for good laboratory practice (GLP) and ISO documentation, the Aquacounter Coulometric Karl Fischer Titrator (AQ-300) (photo, p. 57, top center) offers a choice of ion-exchange or fritless cell systems. A thermal and impact printer are available and the results may be downloaded to a computer. — JM Science, Inc., Grand Island, N.Y.

edlinks.che.com/5825-435

 

Remove dissolved gases from samples with this autosampler

This module integrates a pump,

autosampler and degasser specifically designed for gel-permeation, chromatography/scanning-electron microscopy (GPC/SEC) applications used for polymers and biopolymers. The GPCmax (photo, p.57, bottom right) features a fixed loop autosampler capable of handling 2 or 20 mL vials, and a constant-flow pump. The pump and autosampler can be programmed manually using the front instrument panel or through available software. The module comes equipped with an inline solvent degasser to remove dissolved gases. — Viscotek, Houston, Tex.

edlinks.che.com/5825-436

 

This instrument is ideal for trace-gas measurements in the field

The ESP-1000 (photo, left) is based on a spectroscopic technique known as Cavity Ring Down Spectroscopy (CRDS). CRDS is a high-resolution, laser-absorption technique that achieves an optical path length thousands of times longer than the physical length of the measurement cell. This path-length-multiplication effect is the key to achieving part-per-billion sensitivity levels. Special design consideration was given to sample handling, thermal control, vibration isolation and packaging to insure reliable performance when deployed in the field. Current applications for the ESP-1000 include petroleum refining, environmental monitoring, diesel-emissions analysis and semiconductor manufacturing. Materials that have been successfully measured include ammonia, hydrogen sulfide, acetylene, carbon dioxide, ethylene, arsine, silane and stable isotopes of carbon and hydrogen, says the manufacturer. — Picarro, Sunnyvale, Calif.

edlinks.che.com/5825-437

 

Detect sulfur at high pressures with this on-line analyzer

The 682T-HP sulfur analyzer (photo, right) provides continuous detection of sulfur at pressures up to 800 psig. It can operate either as a stand-alone analyzer or it can be connected to plant-wide automation systems for real-time measurements. The analyzer is designed to measure viscous hydrocarbons in crude-oil lines, pipelines and blending operations. Its integral processor monitors and controls instrument parameters such as gas flowrate, pyrolyzer furnace temperature and gaseous sample relative humidity. — SPECTRO Analytical Instruments, Marble Falls, Tex.

edlinks.che.com/5825-438

 

This spectrophotometer monitors concentrations online

The OMA-300 is a diode-array fiber-optics process spectrophotometer, which was designed to address online applications that require cost-effective, continuous-concentration monitoring, says the manufacturer. In one application, for example, the analyzer was used to detect levels of vanadium tetrachloride and titanium tetrachloride at different stages of a process for making titanium dioxide. The OMA uses a tungsten, xenon or deuterium light source, a holographic grating to disperse the light, a fiber-optics probe to transfer the light to and from the sample and a diode array detector, which converts the light intensity into electrical signals. Wavelengths range from 200 to 1,100 nm. A full spectrum is continuously measured and analyzed to give the composition of the stream. The unit is offered in two different enclosures — 316 stainless steel and a Class 1 Division 1 Groups B, C & D NEMA 4X/7 Cenelec approved enclosure. Two fiber-optic cables are used to conduct light to and from the probe or flow cell. — Applied Analytics, Inc., Maynard, Mass.

edlinks.che.com/5825-439

 

Analyzer aids in characterizing plastics and polymers

This system is designed for elemental analysis of a variety of additives such as pigments, flame retardants, UV stabilizers and catalysts as well as heavy metals in plastics and polymers. Axios-Poly is a wavelength-dispersive X-ray fluorescence (XRF) spectrometer. Key to its capability are two sets of standards. The ADPOL standards are designed for the calibration of additive elements including F, Na, Mg, Al, Si, P, S, Ca, Ti and Zn in plastics and polymers. The TOXEL standards are optional and are designed for the calibration of heavy elements such as Cr, Ni, Cu, Zn, As, Br, Cd, Ba, Hg, and Pb in polyethylene. The software database includes templates and worked examples for typical plastics and polymers applications. Axios-Poly can handle up to 168 samples at a time and can be integrated into automated laboratories or operated as a standalone system. — PANalytical, Almelo, The Netherlands

edlinks.che.com/5825-440

Dorothy Lozowski

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