Upgrading a Mark II to a Mark III

Reference, Installation, and Operations Manual

June 2013

3-9000-743 Rev S

 

 

C.4.10 Frequency output configuration

The Mark III, like the Mark II, provides two frequency output pairs:•Freq1A and Freq1B•Freq2A and Freq2B

While the Mark II allows for some frequency output parameters to be specified independently for each pair, the Mark III allows all frequency output parameters to be specified independently for each pair. Thus, the Mark II frequency configuration points that apply to both frequency output pairs are copied to both corresponding Mark III frequency data points as specified below:

•FreqFlowRateCondition is copied to Freq1Content and Freq2Content.•MaxFrequency is copied to Freq1MaxFrequency and Freq2MaxFrequency.

•TestModeOutputPct is copied to Freq1TestModeOutputPercent and Freq2TestModeOutputPercent.

•FreqFullScaleVolFlowRate is copied to Freq1FullScaleVolFlowRate andFreq2FullScaleVolFlowRate.

The Mark II FreqXContent parameters includes information for both the frequency data content direction and the “B” channel operation in the event of an error. The Mark III provides separate data points for these parameters, FreqXDir and IsFreqXBZeroedOnErr. The conversion for the FreqXContent parameters is as follows:

Table C-2 FreqXContent Conversion Mapping

FreqXContent

FreqXDirIsFreqXBZeroedOnErr

 

 

 

 

 

 

0

(reverse flow rate, zero “B” channel on error)

0

(reverse)

1

(TRUE)

 

 

 

 

 

1

(forward flow rate, zero “B” channel on error)

1

(forward)

1 (TRUE)

 

 

 

 

 

 

2

(absolute flow rate, zero “B” channel on error)

2

(absolute)

1

(TRUE)

 

 

 

 

 

 

3

(reverse flow rate, don’t zero “B” channel on error)

0

(reverse)

0

(FALSE)

 

 

 

 

 

 

4

(reverse flow rate, don’t zero “B” channel on error)

1

(forward)

0

(FALSE)

 

 

 

 

 

 

5

(absolute flow rate, don’t zero “B” channel on error)

2

(absolute)

0

(FALSE)

 

 

 

 

 

 

The Mark II uses two parameters for controlling the frequency feedback on both frequency pairs: EnableFrequencyFeedback to enable/disable the feedback, and FreqFeedbackCorrec- tionPct to specify the feedback correction percentage. The Mark III combines these two parameters into a single data point for each frequency pair, FreqXFeedbackCorrectionPcnt. If the Mark II had frequency feedback enabled, then the FreqFeedbackCorrectionPct value is copied into both FreqXFeedbacMkCorrectionPcnt data points. Otherwise, the FreqXFeedbackCor- rectionPcnt data points are set to zero.

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Frequency output configuration