Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 453)

App.D-8
IM 11B08A01-01E
 Response Delay of Signal Height (mV)
The signal height of A/O chromatograms is displayed with a response delay of approx. 70 %
compared with HMI and ASET chromatograms.
Table 8 Example of Response Delay of Signal Height of A/O Chromatograms
Time (s) ASET chromatogram (mV) A/O chromatogram (mV)
0.08 0.000
0.16 0.500 (0.00–0.500) Ч 0.7+0.500 = 0.150
0.24 0.500 (0.500–0.500) Ч 0.7+0.500 = 0.500
0.32 1.000 (0.500–1.000) Ч 0.7+1.000 = 0.650
0.40 50.000 (1.000–50.000) Ч 0.7+50.000 = 15.700
0.48 100.000 (50.000–100.000) Ч 0.7+100.000 = 65.000
0.56 100.000 (100.000–100.000) Ч 0.7+100.000 = 100.000
1 1 / 1 1 / 2 2
1 5 : 1 5 : 4 5
A/O Setup (1/2)
1 1 / 1 1 / 2 2
1 5 : 1 5 : 4 5
A/O Setup (2/2)
Slot # 1 AO # 1 Slot # 1 AO # 1
> - GCM number * > - #2 Output stream **
- AO Chromatogram Det 1-1 #2 Output peak ***
- #1 Output stream ** - #2 Percent span offset *****
#1 Output peak *** - #2 Percent zero offset *****
- #1 Percent span offset *****
- #1 Percent zero offset
*****
Menu Status Slot# AO# Menu Status Slot# AO#
F1 F2 F3 F4 F5 F6 F1 F2 F3 F4 F5 F6
Figure 9 Chromatogram Output (A/O Setting Screen on GC-HMI EtherLCD,)
 Auto Gain
This is a function to change (enlarge or reduce) the display width of chromatogram signals
according to gain values.
The display width is calculated as follows.
Type of chromatogram Display width of chromatogram signals
HMI and ASET 1000.000 mV/2^[Gain]
A/O 16 mA/2^[Gain]
4 V/2^[Gain] when a 250-ohm shunt resistor is used
Example: Gain: 5
Display width of HMI and ASET chromatograms:
1000.000 mV / 2^5 = 31.250 mV
Display width of A/O chromatograms: 16 mA / 2^5 = 0.5 mA
4 V / 2^5 = 0.125 V (Shunt resistance: 250 ohm)
There are three types of auto gain function as listed below. The calculation method of the display
width and the relevant types of chromatogram differ among them.
2nd Edition : May 11, 2012-00