11
Inlet Flow Conditioning
The airflow going into the flowmeter’s measuring section normally has
a uniform flow profile. An upstream valve, regulator, or small diameter
tubing can create a non-uniform jet of gas through the flowmeter. For
best accuracy your design should avoid these devices immediately
upstream of the flowmeter. When these devices are used, they
should be at least 5 inside diameters upstream from the flowmeter
body. For Models 4021–4024: at least 5 inches (127 m). For Models
4120–4122: at least 1.5 inches (39 mm). Shorter diameters may work
depending on flow rate and change in size.
Same-size elbows and normal tubing bends do not create jetting
problems and they can be used close to the flowmeter body.
Devices on the outlet side of the flowmeter do not create jetting
problems, so anything can be used at that location.
Liquids
Never submerge the flowmeter in a liquid or allow liquid to enter the
flow tube. This may degrade accuracy or damage the internal sensor
element. Be sure that your system design does not allow condensate
or other liquids to enter the flowmeter.
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