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TRAK-IT® IIIa is the most durable and user friendly CGI ( Combustible Gas Indicator) available. The " T3a" can be configured for combustible gas readings in PPM, LEL and/ or percent volume as well as a variety of toxic sensors, oxygen and VOC. The TRAK-IT IIIa is ideal for underground gas leak pin pointing, pipeline purging, and confined space applications. Designed for Extreme Working Conditions Detects and Displays Up To 4 Gases Simultaneously � LEL ( % Volume and PPM Optional) � Oxygen � Carbon Monoxide � Hydrogen Sulfide Stainless steel housing Internal 2 Speed High-Volume Pump Identifies Propane versus Natural Gas Detection SMART-CAL automatic calibration system compatible Regulatory Compliance Applications: NFPA 54 - National Fuel Gas Code Gas Piping System Purging Requirements EPA Method 21 Determination of Volatile Organic Compound Leaks ( VOC) Trak-It IIIa Standard Features � Lowest Cost, Long Life Sensors � LED Warning Lights � Large Bright Graphic Display � Loud Audible Alarm � Optional 1600 Event Auto Log � Exceptional Water Protection � Long Battery Life � Cost Effective As An Area Monitor � Infrared Downloading � Built-in Natural Gas Calibration � Built-in Propane Gas Calibration � Stainless Steel Housing SENSOR SPECIFICATIONS TYPE RESOLUTION RANGE ACCURACY PPM* 50ppm 0-2, 000 ppm ± 10% LEL 0.1% up to 2% 0-100% LEL ± 10% % NAT GAS 0.1% 5.0-100% GAS ± 5% O2 0.1% 0-25% ± 0.2% or 2% * * CO 1ppm 0-2000ppm ± 5ppm or 5% * * H2S 1ppm 0-100ppm ± 2ppm or 5% * * HCN 1ppm 0-30ppm ± 2ppm or 5% * * PRODUCT SPECIFICATIONS Size: 6.5� x 4� x 4.25� ( 16.5 x 10.2 x 10.8 cm) Weight: 2.8 lb. ( 1.27 kg) Operational Temp: -4 to 104 F ( -20 to 40° C) Battery Life: Alkaline: Approximately 40 hrs. Continuous