woltman helix bulk water meter size: 2 "- 12" with various output options (optics or pulses). Detachable mechanical counter assembly ensures quick and easy maintenance. Suitable for large flow measurement, that is, urban water supply, water supply and industrial applications. Woltman turbine Flowmeter is less accurate than positive displacement Flowmeter and Jet Flowmeter in low flow rate, but the flow path is directly passed through Flowmeter, compared with Flowmeter, the flow rate is higher and the pressure loss is smaller. The measuring device does not occupy or severely restrict the flow path, resulting in the reduction of the pressure in the instrument. They are mag meters for large commercial users and master meters for water distribution systems. Normally, filters need to be installed upstream of the meter to protect the measuring elements from sand, ice crystals, or other debris that may enter the water distribution system. Turbine......url:http://www.china-watermeters.com