Panametrics PT878GC, Инструкция по эксплуатации

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TransPort™ PT878GC User’s Manual 17
Chapter 3.
3.1.1 Application Requirements
Before you begin to use the PT878GC, you should ensure that your meter can handle the frequencies required for
your particular application. To check the capabilities of your particular PT878GC, refer to the back label of the
PT878GC, shown in Figure 11 below. The gray label below “Communication” lists the meter type and transducer
frequency the PT878GC can support.
Figure 11: PT878GC Back Label
In addition to checking the available frequencies, you should determine that your application meets the minimum
gas pressure and maximum flow velocity range requirements for optimal measurements, given the pipe size and
pipe thickness. The tables on the following pages list the minimum pipe sizes, schedules, and pressures for use with
the PT878GC.
•
For air, nitrogen, oxygen or argon, refer to Table 4.
• For natural gas, refer to Table 5.
• For steam, refer to Table 6.
1. Find the pipe size of your application
2. Then find the pipe wall thickness of your application.
3. With the pipe size and pipe wall thickness, determine if your application meets the minimum pressure
requirements.
4. Use the same row in the appropriate table to determine the maximum flow velocity capability of the PT878GC.
For reference, the table provides the recommended number of traverses and transducer frequency for your
application.
Note: All provided data is based on metal pipes; plastic pipes have a minimum pressure requirement of ambient
air or any non-attenuating gas with a minimum density of 0.074 lbs/cf (1.185 kg/m
3
). Consult the factory for
applications involving natural gas with sulfur or high carbon dioxide content, or for applications not listed in
the tables.