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PRODUCTS Filter holders The 270 series disk filters have diameters of 37, 47, 62.5, and 100 mm and are usable with most filter media. Available in both in-line or open-faced (aerosol) configurations, these filters are made of stainless steel or anodized aluminum and come equipped with rain-hat aerosol inlets for outdoor air sampling. Sierra Instruments 101 Solar modules
Fabricated of heat-exchangermethod silicon, these square cells produce higher power from less surface area than is possible with circular cells. Crystal Systems 102
Infrared microscope Model F microscope permits direct viewing of internal defects in silicon integrated circuits. May also be used for failure analysis of solid-state lasers, LEDs, organic materials, minerals, and pigments. The instrument may be used in transmission, reflection, polarization, or IR fluorescent modes. Magnifications range from 30X to 600X. Research Devices 103 Motorized monochromator Model GM252/301 includes a quarter-meter monochromator with a total range of 180-3000 nm and a stepper motor wavelength drive that is compatible with a computer. The motor drive provides seven speedsof 10-1OOO nm/min. This instrument features interchangeable gratings and continuously variable bandwidth control and is suitable for high-power illumination and low-light-level transmission. Kratos/Schoeffel Instrument Division 104
Need more information about any items? vso,just circle the appropriate number3 on one of the reader service cards b a u d into rhis issue and mail in the card. No stamp is necessary. ll(M
Environmental Science 6, Technology
Plastic conductivity cells Flow-through conductivity cells are suitable for in-line sampling when flow rates are low and suspended solids are present. Nickel, graphite, and platinum electrodes are available and all cells are rated 100 psi at 105 OC. 105 Beckman Sample handling systems Used with UV-vis photometer analyzers, these systems include a filter probe for extracting samples; heated tubing for transportation of sample gas, calibration gas, and air; and a selection of termination modules to house valves, connectors, and fittings. The systems contain improved insulation and heating devices, and ball valves for automatic control of gases. DuPont 106 Spill cleanup kits Universal kits are designed for handling 1500-mL spills of toxic and hazardous chemicals and consist of six spill-control pillows, disposable gloves, chemical splash goggles, and a disposal 107 bag. Lab Safety Supply
pH electrode system Designed to monitor the pH of bench-scale systems continuously, this instrument consists of a flat surface combination pH electrode mounted in a flow cell. The cell has an internal volume of less than 0.20 mL and includes inlet and outlet fittings sized for %ein.-o.d. tubing. The device is suitable for a variety of low-flow applications, including the detection of liquid chromatography effluents. Markson 109
NO. analyzer Portable chemiluminescent analyzer is designed for use in the lab or the field. Includes four selectable ranges from 0.5 ppm to 50 ppm full scale with automatic zeroing circuitry. The instrument also has five automatic fault LED displays and an adjustable alarm. Columbia Scientific Industries 110 Mass spectrometer system Model 312 system is suitable for high-performance, low- and high-resolution organic analyses. Designed for routine and research work, capabilities include manual or automated mass determination techniques, metastable and collision-activated metastable investigations, negative ion investigations, and highly specific mass fragmentography. Finnigan MAT 111
Oxygen analyzer An in-situ device for measuring percent oxygen in smoke stacks utilizes a heated zirconia element at the probe end. Response time to changes in oxygen is less than 3 s. Three ranges-O-l0% and 0-2570 linear and 0.25-25% log-and a recorder output of 0-1 V or 4-20 mA are available. A heated element surrounds the zirconia cell to maintain it at a constant temperature. Datatest 108
pH electrodes Porous Teflon reference junctions are used on these electrodes to provide predictable flow or leakage rates. Operating temperatures from -40 to 150 OC may be used. Innovative Sensors 112
Companies interested in a listing in this departnienl should send their releases directly to Environmental Science & Technology, Attn: Products. I155 16th SI.. N.W.. Washington. D.C. 20036
Trace gas analyzer Model I50G chromatograph analyzes trace gases in the low ppm range. The system incorporates an ultrasonic detector that analyzes a gas by measuring the speed of sound traveling through it. The detector operates with all carrier gases, including oxygen, and is equipped with a dual-loopgas-sampling valve and a column-switching valve. Tracor Instruments 117
Liquid chromatography programmer A 24-channel device for programming solenoid valves, power outlets, motordriven selector valves for step gradients. and valves or pumps for continuous gradient generation. Two of the channels can be programmed to produce a pulsing signal to operate sampling valves and fraction collectors. The instrument contains a large instruction memory that retains multiple programs and allows existing programs to be modified or updated throughout a chromatographic run. Eldex Laboratories 113 Gas-sensing electrodes Designed for ammonia-ammonium, carbon dioxide-carbonate, and nitrogen oxide-nitrite applications, these electrodes provide fast response times, minimal drift, high stability, and low detection limits according to the manufacturer. A modular-design membrane cap eliminates handling or assembling the membrane or membrane supports. Graphic Controls
Micro hammer-cutter mill A compact laboratory mill combining the actions of a knife mill and hammer mill pulverizes a wide range of samples: paper, fabric, wood, coal, coke, grains, dried plants, soil samples, soft rocks, chemicals, and pharmaceuticals. The stainless-steel grinding mechanism disintegrates most substances in 30- I20 s. The mill has a variable speed control and a choice of screens to determine particle size. Spex Industries 118
Coliform bacteria tester A multiple-tube fermentation system, accepted by EPA for determining total and fecal coliform bacteria in water and wastewater, includes liquid media vials, incubator, and all accessories necdcd for coliform testing. The incubator holds up to five sets of five IO-mL culture samples and maintains any temperature from ambient to 50 OC fO.l. Hach Company I19
114
Hydrogen sulfide monitor Operates either as a portable or fixed monitor to measure HzS concentrations in the range of 1-50 ppm. The compact unit incorporates an HzS sensor, electronic circuit, microprocessor, digital concentration displays, operating controls, and audible alarm. The LED displays show present concentration, time-weighted average value for exposure on a single work shift, or maximum concentration value during a work period. Sierra Monitor 115
Spectrofluorometer $9 double-grating, scanning instrument features an advanced optical system with holographic concave gratings. Monochromator emission and excitation as well as fluorescence energy are displayed digitally, and a wavelength range of 200-800 nm is provided. A special model is available for liquid chromatography applications. Kontron Analytical 116
High-capacity stack sampler Sampler for in-stack particle sizing collects gram quantities without overloading, provides size data in four size ranges, 11-1.5 pm; fits a 3-in. sampling port; and may be used in temperatures up to 1500 OF. Andersen Samplers 121 Purging device Isolates purgable halo- and hydrocarbons in wastewater and drinking water for subsequent analysis. Passes an inert gas through the sample which purges the compounds of interest. The gas then enters a trap that retains the purged compounds while letting the gas pass through. The trap is then heated to release the compounds for analysis with gas chromatography. 122 Whcaton Scientific Interface card for computers An interface card designed for use with the APPLE I I computer controls or collects data from most scientific instruments, including chromatography systems, spectrophotometers, pH meters, strip chart recorders, temperature controllers, etc. The instrument includes a 12-bit A/D and a 12-bit D/A converter, each having four jumperselectable voltage ranges. Interactive Microware 123
HPLC guard column Protects the packing of analytical columns from degradation or dissolution by aggressive mobile phases and from contamination by sample impurities such as particles or precipitated traces of protein. The refillable guard column may be tappacked with a pellicular packing or slurry-packed with 3-, 5-, or IO-pm material to match the analytical column functionality. Scientific Systems 124 Portable digital thermometers Model 6100 has a single continuous range from -99 to 999 F and model 6200 a range of -99 to 999 OC. The thermometers have a built-in calibration reference that permits field inspection and calibration to plus or minus one degree and include built-in rechargeable batteries, a 0.3-in.-high LED display, and a charger that permits continuous line operation without recharging the batteries. IMC Instruments 120
Mass spectrometer controller BalzersQMS 212 control unit replaces the standard control unit of any QMG I12 quadrupole mass spectrometer and provides visual output of spectra on a 12-in. black-and-white CRT. The unit provides a variety of display formats including bar graph, analog, multiple ion detection output for up to eight channels, and tabulation of normalized and unnormalized mass spectra. Balzers 125 Volume 15. Number 10. October 1981 1187
Zirconium mortar and pestle This unbreakable mortar and pestle will not contaminate samples with the normal elements for which they are being tested, according to the manufacturer. Teledyne Wah Chang Albany 126 Digital Humeter Measures relative humidity directly. Provides measurements over a range of O-lOO% relative humidity with automatic temperature compeisation from -5-65 "C. Phys-Chemical Research 127 Kits for time-weighted average Determines the time-weighted average of many substances colorimetrically in the field. Consists of a sample pump, spillproof impinger, solutions for about 25 tests, and a color comparator. Kits are available for over 25 substances, such as carbon monoxide, hydrogen sulfide, sulfur dioxide, and lead. Daco 133 Products Reference standards Reference standard kits for analysis of PCBs, PBBs, haloelhers, nitrosamines, heterocyclic carcinogens, polynuclear aromatics, chloroaromatics, and other
pollutants are made to specifications in many combinations, including rep licas of those outlined in EPA's methods #601-612. Analabs 134 Logger for harsh environments Environmentally sealed data logger permits high-frequency measurements in harsh land and shipboard environments. Provides 16 full differential recording channels with 12-bit A/D conversion for high resolution. Scan intervals can be set l/4-2048 s, burst intervals of 7% min-16 h, and burst durations of 32-4096 scan/burst. Incorporates a digital cassette recorder with a 725 OOO measurement capacity. 135 Sea Data Digital density meter This hand-held instrument, designed to be used in the field, production line, or lab, is independent of an external thermostat and operates on a 9-V battery. The sample is introduced into the sample cell by means of a syringe or the attached hand pump. Within 15-60 s, the meter calculates the density of the sample at the sample temperature and both measurements are shown on liquid-crystal diode displays. Mettler 129
$3560 buys industry's newest and most advanced Ozone Monitor
1108 Envlronmemal Scienu, 6 Technology
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-.. Quartz filters Manufactured from pure silica fibers that are acid-washed and leached to achieve a purity of 99.6% SiO2, these filters are completely binder-free. They obtain strength and easy handling from an addition of 5% pure borosilicate glass microfibers. According to the manufacturer, they provide high particle retention efficiency, even with high flow rates, and the levels of heavy metals and alkaline earths are very low. Whatman Laboratory Products 131
Temperature sensors Platinum sensor, '/16-in. wide, makes fast temperature measurements. This can be used in laboratories, engines, and other locations where fast temperature measurements are needed. 132 Hy-Cal Engineering
This entirely new, state-of-the-artozone-in-air monitor eliminates the chemicals and reactive gases required for other types. It is based on the UV absorption principle and features microprocessor-based,digital electronic design. Included in Model Lc's many standard features are: Range of 0.000-9.999PPMby volume with precision of 1 % or 1 digit. 8 Incremental Sensitivitv of 0.001 PPM with linearitv of
