Yokogawa GC1000 Mark II Process Gas Chromatograph - Manual (Page 74)

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IM 11B03A03-01E
(4) Input Register (Measured Data)
(1) Stream number
The currently active stream number on the GC1000 Mark II is displayed. In Stop or
Manual mode, the stream number is 0. In Lab mode, the stream number is 32.
(2) Starting peak number
The starting peak number assigned to each stream on the GC1000 Mark II is dis-
played. The maximum number of analysis values, including peaks of all streams, is
255. The number is 0 if no peak is assigned.
(3) Peak number
Peak number assigned to each stream on the GC1000 Mark II is displayed. See the
Figure 5.5 below.
Example: the peak number of Stream 2, Peak 3 is 7.
F0519.EPS
Stream 1
Stream 2
Stream 3
255
Starting peak number = 1
Starting peak number = 5
Starting peak number = 15
Number of peaks = 4
Number of peaks = 10
Number of peaks = 10
Starting peak number = 25
Figure 5.5 Example of Peak Allocation
(4) Sampling time
This register contains the latest sampling time for each stream on the GC1000 Mark II.
Hour and minutes are stored.
F0520.EPS
Hour Minute
Example : 15:23
0F17 (hexadecimal)
(5) Analysis value
This register contains each analysis value. The value is represented by a fraction to
the full scale or by a real number (floating point format). The full scale is set in ad-
vance for each analysis value and the scaling factor is user selectable as either 9999
or 65535. The real number format conforms to the IEEE standard and requires two
registers per peak.
The fraction format is calculated as follows:
(Analysis value x Scaling factor)/Full scale value
For example, if the analysis result is 5 ppm and the range is 0-20 ppm, the value read
using a scaling factor of 9999 is
F0521.EPS
20
x 9999 = 2499 (09C3)
5
For the real number format, units such as % and ppm are considered. For example,
the real number value converted from 1.5 is directly transmitted as 1.5%. The
GC1000 Mark II updates analysis values at the end of each cycle. The GCIU updates
the average values according to the userset scan interval.
(6) Retention time
This register contains the retention time for each measured stream of the GC1000
Mark II. The unit is in seconds.
3rd Edition : Aug. 23. 2006-00