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The HD2303.0 is a portable instrument with a large LCD display. It is designed for use in the fi elds of air conditioning, heating, ventilation and environmental comfort. It uses hot-wire or vane probes to measure air speed, fl ow rate, and tem- perature inside pipelines and vents. Temperature only is measured by immersion, penetration or air contact probes. The temperature sensor used can be chosen from the Pt100, Pt1000. The probes are fitted with the SICRAM module, with the factory calibration settings already being memorized inside. The Max, Min and Avg function calculate the maximum, minimum or average values. Other functions include: the relative measurement REL, the HOLD function, and the automatic turning off that can also be disabled. The instruments have IP67 protection degree. INSTRUMENT TECHNICAL CHARACTERISTICS Instrument Dimensions ( Length x Width x Height) 140x88x38mm Weight 160g ( complete with batteries) Materials ABS Display 2x41D2 digits plus symbols Visible area: 52x42mm Operating conditions Operating temperature -5… 50° C Warehouse temperature -25… 65° C Working relative humidity 0… 90% RH without condensation Protection degree IP67 Power Batteries 3 1.5V type AA batteries Autonomy ( * ) 200 hours with 1800mAh alkaline batteries Power absorbed with instrument off 20¼ A Measuring unit ° C - ° F - m/ s - km/ h - ft/ min - mph - knot - l/ s m3/ min - m3/ h - ft3/ s - ft3/ min Connections Input module for the probes 8-pole male DIN45326 connector Measurement of temperature by Instrument Pt100 measurement range -200… + 650° C Pt1000 measurement range -200… + 650° C Resolution 0.1° C Accuracy ± 0.1° C Drift after 1 year 0.1° C/ year