To overcome these disadvantages, a diaphragm meter
has been coupled with an MIU (Figure 2), a modified, electronic secondary element of a new generation equipped with a microprocessor.
The main type of PD meter used for gas flows is the diaphragm meter
Sensus says its patent-pending accuWAVE[TM] diaphragm meter
design will be available on the model 415, Class 400 meter in mid-2010.
Trying to come up with a much smaller alternative that is as accurate as the traditional diaphragm meter
but incorporates microprocessor technology is difficult because they tend to be more expensive, so gas utilities are reluctant to utilize them in a big way.
This assessment, through the application of reverse engineering, resulted in developing an estimate of the relative manufacturing cost, reliability, and metering accuracy of each technology normalized to a reference diaphragm meter
, the Rockwell S-275.
The diaphragm meter
has been used by the gas industry since the mid 1800s and is able to maintain a high degree of accuracy for period of approximately 20 years.
One of the biggest goals has been to make our meters more compact and lighter weight and although this is all the talk these days with residential meters, we have been downsizing our diaphragm meter
line since 1989.
Manufactured by United Gas Industries in London in partnership with Fisher-Rosemount which owns the technology and has sole marketing rights in North America, the Snug Meter is believed to be the smallest four-chamber diaphragm meter
with this capacity available today, Adams says.
GRI currently is pursuing development of a compact diaphragm meter
and evaluating several advanced electronic meters for future use in the U.
The tried-and-true diaphragm meter
and new automated meter reading devices are working together to modernize measurement," he said.
The Elster American Meter diaphragm meter
is preferred by many customers due to its accuracy over a long service life, outstanding durability and impact on maintenance costs.
The first two meters were one of each ultrasonic design and the third meter, which was used for billing, was a new specially calibrated diaphragm meter
with a pulse output.