Its simple automatic operation, continuous measurement & digital display of purity concentration makes it a valuable aid for on-site instant analysis & follow up action. Its data logging & computer interface features can be used for further detailed analysis in the laboratory.The HNL Portable Model GA - 154 with digital read out and alarms is a direct reading compact Portable Gas Purity Analyzer, designed to serve the demanding field requirements of various gases Producing and using Industry. It is designed to replace the cumbersome and time consuming Or set apparatus and provide quick and accurate reading of gas Purity. It offers the user a distinct advantage in terms of economy, dependability maintenance and ease of operation. The instrument incorporate TCD / INFRARED as a transducer. It has adjustable visual and audible alarms with Automatic Zero Calibration Feature