Meter diameter (mm): And the connection mode 25,40,50,65,80,100,125,150,200,250,300 use flange connection Precision grade   ±1.5%R,±1.0%R,±0.75%R(special) Quantity range:  1:10;1:20;1:30 Instrument material: 304 stainless steel;Impeller: anticorrosive ABS or high quality aluminum alloy;Monitor: cast aluminum Measured medium temperature (?) : -30?~+80? Environmental conditions of temperature :-20?~+60? , relative humidity 5%~90% , atmospheric pressure 86 ~ 106 kpa The output signal Sensors pulse frequency signal, the low level 0.8 V or less, high level 8 V or higher two wire system 4 ~ 20 madc current signal Power supply VOLTAGE + 12 VDC and + 24 VDC (optional) + 24 VDC Display type instrument comes with 3 v lithium battery Signal transmission line  STVPV3 x 0.3 (three-wire system), 2 x 0.3 (two wire) transmission distance   =1000m Protection IP65 Explosion-proof grade basic   ExdIIBT6