Reference, Installation, and Operations Manual

Section 6: Meter operation

3-9000-743 Rev S

June 2013

 

 

 

6.1.17AGA8 compressibility calculations

The Mark III meter utilizes AGA8 compressibility calculation results for profile-effect correction (for JuniorSonicTM meters) and flow-condition-to-base-condition of the volumetric flow rate.

The Mark III meter provides for five AGA8 method selections via the HCH_Method data point:

external (0) with results specified to the meter (via the SpecRhoMixFlow, SpecZFlow, and SpecZBase data points)

internal via Gross Method 1 (1)internal via Gross Method 2 (2)internal via Detail Method (3)None (4) (AGA8 calculations are not performed)

Refer to Section 5.6.14 for information on configuring the meter for AGA8 calculations via the Daniel MeterLink program.

6.2Frequency, digital, and analog outputs

The Mark III meter provides two pairs of individually configurable frequency outputs (FO1A, FO1B, FO2A, and FO2B), four individually configurable digital outputs (DO1A, DO1B, DO2A, and DO2B), and an optional analog output (AO1 via the Option Board). The frequency and digital outputs are divided into two groups as follows:

Group 1:FO1A, FO1B, DO1A, DO1B

Group 2:FO2A, FO2B, DO2A, DO2B

The two members of a frequency output pair are referred to as channel “A” and the channel “B”.

Each group has a separate ground (i.e., Group1Gnd and Group2Gnd) thus allowing each output group to be connected to a different flow computer. Refer to Section 2.5.2 for further information on the hardware configuration options for these outputs.

The frequency, digital, and analog outputs are updated at the batch update period.

6.2.1Frequency outputs

The following paragraphs describe the frequency output pair options in detail. Since each frequency output pair is individually configurable, the data point names are identical except for the pair identifier (‘1’ or ‘2’). For example, the frequency pair content data points are Freq1Content and Freq2Content. For brevity, they are identified as FreqXContent where X represents 1 or 2.

Refer to Section 5.6.7 for information on configuring these outputs using the Daniel MeterLink Field Setup Wizard. The associated configuration data points can also be configured via the Daniel MeterLink Edit/Compare Configuration screen.

AGA8 compressibility calculations

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