* explosion proof level :Exd BT6. * cast aluminum shell * A/D conversion resolution :800000. * display resolution :30000. * A/D conversion speed :80 times/SEC. * sensor excitation :+5VDC, maximum available current 10mA. * it can drive 4, 350 sensors. * sensor temperature drift: less than or equal to 0.15. * sensor sensitivity temperature drift: 10 mu V / ℃ or less * non-linear: no more than 0.01% s. * power supply: input voltage :220VAC(-15% ~ +10%)/50Hz. Output voltage :9 v / 800 ma. * size :285 * 260 x 160(long x width x depth)mm. * RS232C interface * RS485 interface (optional) 4-20 mah output.