A rotameter, also known as a variable area flowmeter, is a device that measures the flow rate of liquid or gas in a closed tube. It measures flow rate by allowing the cross-sectional area the fluid travels through, to vary, causing a measurable effect. They are a cost-effective flow measuring device that provides excellent repeatability, requires no external power, can be made from a wide variety of materials, and may be designed for high pressure and high temperature applications.
- Inspect meter for damage that may have occurred during shipping. Report any damage to the container to the freight carrier immediately.
- Make sure your pressure, temperature, fluid and other requirements are compatible with the meter and components (including o-rings).
- Select a suitable location for installation to prevent excess stress on the meter which may result from:
- Misaligned pipe.
- The weight of related plumbing.
- “Water Hammer” which is most likely to occur when flow is suddenly stopped as with quick closing solenoid operated valves. (If necessary, a surge chamber should be installed. This will also be useful in pressure start-up situations.)
- Thermal expansion of liquid in a stagnated or valve isolated system.
- Instantaneous pressurization which will stress the meter and could result in tube failure. note: In closed thermal transfer or cooling systems, install the meter in the cool side of the line to minimize meter expansion and contraction and possible fluid leaks at the threaded connections.
- Use an appropriate amount of teflon tape on external pipe threads before making connections. Do not use paste or stick type thread sealing products.
- Over tightening of plastic connections may result in fitting damage.