As an insertion meter
, flow in large pipes can be measured and the Hot Tap model can be used to measure pipes from 2 to 24-inch (50 to 1200mm).
ABB Limited has enhanced its AquaProbe insertion meter
range with a three year warranty period as standard, with an added two year purchase option if required.
Nice Instrumentation introduced its first insertion meter
, called the Vortex Bar, three years ago.
The other basic type of thermal mass sensor, the bypass or calorimetric meter, overcome the insertion meter's dependence on the assumption of constant thermal conductivity.
Thermal sensors come in three basic forms: hot wire anemometers or insertion meters, thermal profile or bypass meters, and clamp-on thermal meters.
The insertion meter
may be installed or removed from an active line without interrupting service.
Low flow measurements were taken with a Daniel's Senior orifice fitting and the high flow measurements were taken using a Preso insertion meter
. A Barton chart recorder measured the differential across both meters.
are widely used for flare and duct stack gas measurement.
Ultrasonic flow meters come in the form of either clamp-on, spoolpiece or insertion meters
. The transducers of clamp-on ultrasonic flow meters are mounted outside the pipe.
can be installed under pressure using special hot-tap techniques and pipe clamps avoiding the need to switch off compressors and stop production.
The calibration manifold can accommodate wafer meters from 1/2-inch to 4 inches in diameter, along with insertion meters
in a 6-inch diameter pipe.
are and to measure flare gas in stacks, and ultrasonic flowmeters are used more widely in the chemical and refining industries.