Suppliers and Manufacturers of DP Transmitters
DP transmitters have been in use to measure flow for more than a century. DP transmitters rely on a constriction called a primary element in the flowstream to create a pressure drop in the line. They measure the difference between downstream and upstream pressure to compute flow, using Bernoulliís theorem. DP transmitters rely on a variety of primary elements to create the constriction in the line.
DP transmitters are part of a family of pressure products.
Other types of pressure transmitters include absolute and gauge. Absolute
pressure transmitters measure pressure without taking atmospheric pressure
into account. Gauge pressure transmitters include atmospheric pressure in
their pressure measurement. Between the two, gauge pressure transmitters
are more common than the absolute variety.
One of the most important developments in pressure transmitters
with implications for flow has been the development of multivariable
pressure transmitters. Multivariable transmitters measure two or more
process variables. In the
context of flow, they have differential-pressure capability, which allows
them to compute volumetric flow. In addition to this measurement, they
contain a pressure and temperature sensor and/or transmitter to make a
temperature and/or pressure measurement. Multivariable pressure
transmitters that measure differential pressure, temperature, and gauge or
absolute pressure can compute mass flow. This makes them capable of
measuring the mass flow of steam and gas.
For information on available market studies, please see http://www.flowdp.com.
The following are some of the supplier of DP transmitters used to measure flow:
For information on these and other flowmeters companies, select Companies under Discover More at the home page, or simply click here: http://www.legendsofflow.com.
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Flow Research, Inc.
27 Water Street
Wakefield, MA 01880
(781) 224-7552 (fax)