Unisearch Associates Inc. products

Differential Optical Absorption Spectroscopy or DOAS, is based on the principle of measuring the differential absorption of the incoming signal in the wavelength region of interest after it has passed through a gas medium.  It uses a broadband light source and the measurement is made over a large wavelength range (like FTIR and NDIR, and unlike TDL that uses a very narrow wavelength range). In general, overlap of absorption features of several gases is observed. This requires the use of multiple regression methods of analysis. The concentrations of a gases are calculated by comparing the absorption signals with their stored reference signals. As in any broadband measurement technique, interference from other gases must be taken into account and corrected for to improve accuracy of measurement. This requires a prior knowledge of the gas composition before the final measurements can be made.

LasIR Laser-based In-situ Gas Monitor For US-EPA (PS-18) & TÜV Compliance (EU-EN 14181), Process Monitoring.

LasIR Laser-based In-situ Gas Monitor For US-EPA (PS-18) & TÜV Compliance (EU-EN 14181), Process Monitoring. Unisearch LasIR Gas Analyzer is a continuous monitor designed to measure flue gases for both compliance and process monitoring. The Controller uses a near infrared (NIR) Tunable Diode Laser Absorption Spectrometer System utilizing a single mode laser mounted in a thermoelectric cooler for unsurpassed accuracy and performance. Since the spectral purity of the laser is high and the selected absorption feature is unique, measurements can be made free of interferences from any other gas. The measurements are made in-situ across the stack or duct in either a single or dual pass design (depending upon the application). A Windows based software package displays the data on either a Host laptop PC or the client’s existing data acquisition system.

LasIR Laser-based Fence Line Gas Monitor for Emissions Monitoring. Unisearch LasIR Gas Analyzer is a continuous monitor designed to measure open path both compliance The Controller uses a near infrared (NIR) Tunable Diode Laser Absorption Spectrometer System utilizing a single mode laser mounted in a thermoelectric cooler for unsurpassed accuracy and performance. Since the spectral purity of the laser is high and the selected absorption feature is unique, measurements can be made free of interferences from any other gas. A Windows based software package displays the data on either a Host laptop PC or the client’s existing data acquisition system.

This multichannel gas analyzer allows you to take readings in up to sixteen locations simultaneously. Onboard memory enables you to save the data, which can then be loaded into a computer for analysis. Detection Limits (ppm-m) : HF - 0.1 NH3 - 0.5 CO/CO2 - 200 CH4 - 0.5 H2S - 10 H2O - 0.2 HCl - 1. Path Length  : 1 - 1000 meters. Environment  : -10°C - +50°C 95 - 110 KPa 0 - 95% RH. Data Storage : 2000 MB Compact Flash. Power : 12 VDC; 1.5 Amps. Dynamic Range : 5 orders of magnitude. Response Time : Typically 1 second. Output : RS-232 Ethernet 4-20 mA. Calibration : Factory set. AC Adapter : 110/240 VAC 50/60 Hz 60 W.

Our Patented 1 and 2 channel LasIR gas analyzers ensure ambient air quality monitoring. Their detection capabilities include oxygen monitoring, CH4 monitoring, NH3 monitoring, HF monitoring and HCl monitoring.

Compact and durable, this portable gas measurement equipment allows the user to move easily from one location to the next in order to analyze gas emissions in a variety of environments. Onboard memory allows to save data which can then be loaded into a computer for analysis.

This compact unit is perfect for use in ducts or stacks. Onboard memory enables you to save the data, which can then be loaded into a computer for analysis. Onboard memory enables you to save the data which can be loaded into a computer for analysis.

The IMx Monitoring system is a highly modular Fourier Transform Infrared (FTIR) monitor that can be configured by the user to perform one of several different monitoring tasks. The IMx consists of a base unit and snap-on accessories. The accessories allow for A. extractive monitoring (e.g. stack or process control) using one of several different cell configurations or B. open path monitoring (e.g. cross-stack or open-air) using telescope based accessories. All units are NEMA enclosed for use outdoors or in explosive environments and configurations exist for internal or external computer control.

These are a series of lightweight, highly sensitive instruments, based on a novel surface chemiluminescence. Suited for indoor and outdoor monitoring and ideal for applications where battery operations and lightweight mobility are required, such as on aircraft. The principle of operations is very simple. The sample air is drawn through the instrument by a micro pump and flows across a fabric wick wetted with a prescribed solution. The solution is continuously replenished at the top of the wick and removed at the bottom by a liquid mass flow system. Surface reaction of the monitored gas results in chemiluminescence. The resultant signal from the photomultiplier is directly proportional to the mixing ratio of the gas in the air.