Principle of low-voltage, multi-pulse accuracy better than 1%; Repeatability: 0.5%; measurement cycle: 500ms backlit LCD can display instantaneous flow and cumulative flow, instantaneous heat and heat accumulation, flow rate, and time data signal output current output: 4-20mA or 0-20mA, etc., impedance 0-1K, accuracy 0.1% OCT output: positive, negative and net flow or heat pulse or instantaneous flow cumulative frequency signal (between 1-9999HZ optional) Relay: output nearly 20 kinds of source signals (such as no signal, reverse flow, etc.) sound the alarm: the buzzer to sound an alarm (such as the amount of traffic, too) can be entered Rd signal input current signal (eg depending on the setting: temperature, pressure , level, etc.) in order to achieve thermal measurements or one machine to automatically remember the first 64 days, 64 months ago, five years ago before the cumulative flow automatic memory 64 times calls and power outages and traffic can be carried out manually or automatically fill volume reduce user traffic loss recorded automatically 64 days before the normal working condition meter data interface: factory configured for RS-232 mode, the optional RS-232 / RS-485 converter can be changed after the RS-485 mode programmable batch (quantitative) controller dedicated cable type:. SEYV75-2 shielded single can be extended to 500 meters (over this length contact the manufacturer), but the user should pay attention not to the parallel cable and high-voltage cables, try to avoid the drive pipe pipeline case all the mass density of the pipeline steel, stainless steel, cast iron, cement pipes, copper, PVC, aluminum, glass, steel, etc., allowing lining tube diameter 15mm-6000mm straight pipe sensor installation point best meet: Upstream 10D, downstream 5D, away from the pump outlet 30D (D refers to the diameter) to measure the kind of medium water, sea water, industrial waste water, acid, alcohol, beer, oils, etc. can be conducted ultrasonic single homogeneous liquid 0-160 ℃ temperature and turbidity ≤10000ppm small bubbles content velocity 0- ± 30m / s bi-directional flow measurement of positive and negative, and net heat flow measurement or host operating ambient temperature: -30-80 ℃ flow sensor: -40-160 ℃ humidity of 85% RH hosts flow sensor: work can be flooded, depth ≤3m Power AC220V or DC8-36V or AC7-30V power 2W Weight F1: 2.5Kg F2: 7Kg S: 1.5Kg