Titan Insertion Flow Meters
The Polyvinylidene Fluoride (PVDF) turbine on Titan insertion flow meters rotates freely on a 316 stainless steel shaft and has specially aerofoil shaped blades to extend the dynamic range of the meter. The specially contoured housing further improves the meters linearity particularly at lower fluid velocities. Each insertion flow meter contains two sensors, one self-powered (for battery operated equipment) and the other an open collector transistor. A reed switch may be specified for hazardous areas were simple apparatus is acceptable. The body of the insertion flow meter is manufactured from AISI316 stainless steel and as standard is supplied with three metres of five core screened instrument cable. These insertion flow meter devices provide a cost effective and simple means to measure the flow of a wide range of low viscosity liquids.
Insertion flow meter devices measure the point velocity of the liquid in a pipe. Flows in very large pipes can be measured this way using relatively inexpensive metering devices. There are two basic types of insertion flow meter turbines, an axial (propeller type) and a radial type (undershot water wheel). Overall accuracy is similar in either case. In both turbine types the fluid velocity profile in the pipe must be “fully developed” as the arithmetic for the whole pipe throughput is derived from this point flow measurement. Upstream disturbances such as control valves, pipe bend, pumps and pressure regulators must be positioned well away from the flow meter insertion point, up to 100 pipe diameters in the worst case. Due to the relatively small disturbance the metering head introduces to the pipe, pressure losses for this type of insertion flow meter are very low making energy savings by reducing pumping costs. Some types of insertion flow meter turbines are self-powered permitting their use in remote areas where power is an issue.