Indoor Air Quality (IAQ) Monitor ST-501 Indoor Air Quality (IAQ) Monitor - Building HVAC Monitoring. - Indoor Air Quality Survey. - Locate Combustion Fumes. FEATURES: - 3 independent CO2, humidity and temperature sensors. - User operated CO2 calibration. - Datalogging up to 50,000 records with fast USB download. - Internal back-up battery to maintain the data of Date/Time. - Power management IC to increase battery efficiency. - Easy-to-use PC software or parameter setting and data analysis. - Building in audio CI2 buzzer/alarm. ST-501 SPECIFICATION: CO2 Sensor- GE Dual Bean Absorption infraredTM. Temperature /Humidity sensors. Measurement range : 0 to 5,000 PPM. Display resolution: +/-1 PPM Accurancy: +/- 75 PPM or 10% of reading. Measurement Ranges Accuracy CO2 0 ~ 5,000 PPM +/- 75 ppm or 10% of the reading Humidity 0 ~95% RH 2.5% at 10% to 90% RH Temperature 0ºC ~50ºC +/- 5ºC @ 0 ~50ºC Signal Update Every 2 seconds Warm Up Time < 2 minutes Operation Conditions 0ºC ~50ºC (32ºF to 122ºF), 0 to 95% RH, non condensing Carbon dioxide Meter CO2 Meter Gas Leak Detector Gas Meter ST-501 TENMARS à¤Ã×èͧµÃǨ¨Ñºá¡êÊÃÑèÇ à¤Ã×èͧÇÑ´ CO2 à¤Ã×èͧÇÑ´¡êÒ«¤ÒÃìºÍ¹ä´ÍÍ¡ä«´ì à¤Ã×èͧÇÑ´¤Ø³ÀÒ¾ÍÒ¡ÒÈ à¤Ã×èͧÇÑ´á¡êÊ