Conductivity Analyzer. A device that measures a liquid’s or an object’s ability to conduct an electric current between two points, and displays the result in mhos (the reciprocal of resistance (ohms).
Things to Consider: Range, Resolution, Accuracy, Calibration, Automatic temperature compensation, Power requirements, Power consumption, Display type, Auto shut-off, Operating temperature range, Hold function, Dimensions, Weight, Warranty.
Gas Detector Analyzer. A device which detects the presence of various gases within an area, and identifies them. These devices are used as part of a system to warn about gases which might be harmful to humans or animals. Gas detectors can be used to detect the presence of combustible, toxic, or specific gases.
Things to Consider: Approvals, Accuracy, Current Draw, Detection method, Enclosure Construction, Installation category, Operating voltage, Analog output, Digital output, Power consumption, Response time, Sampling method, Temperature range, Weight, Wire connection scheme, Warranty.
Photodiode Array Wavelength Analyzer. These analyzers disperse a broadband light source through a prism and direct it onto a diode array. Individual diodes can be monitored for substances that absorb light at that particular wavelength. The results are electronically modified and sent to a readout device.
Things to Consider: Noise, Drift, Wavelength accuracy, Self-calibration and verification capabilities, Resolution, Linearity, Photodiode array size, Pixel resolution, Optical resolution, Lamp types, Analog output ports available, Flow cell materials, Path length, Cell volume, Flow cell pressure limit, Dimensions, Power requirements, Operating temperature and humidity (noncondensing) ranges, Data collection software, USB-based digital data collection, Detector status indicators on front panel, Agency approvals, Warranty.
UV Detector Wavelength Analyzers. These analyzers take light from a UV light source, pass it through a sensor cell onto a photoelectric cell, electronically modify the the output, and publish it to a potentiometric recorder, a computer, or a printer. It operates due to the characteristic of many compounds to absorb light in the ultraviolet wavelength range. With a monochrometer placed between the light source and the cell, light of a specific wavelength can be detected. With a broadband light source dispersed by prism and directed onto a diode array, individual diodes can be monitored for substances that absorb at that particular wavelength.
Things to Consider: Wavelength range, Spectral half-width, Accuracy of adjustment, Reproducibility, Light sources, Noise level at empty cell, Drift at empty cell, Materials in contact with mobile phase, Time constant selection, Programming capability, Adjustable offset, Output for integrator, Interface, Power supply, Power input, Dimensions, Weight, Standard cell volume, Optical path, Diameters of capillaries, Optional cell specifications, Agency approvals, Warranty.
