App.d-8, Response delay of signal height (mv), Auto gain – Yokogawa GC8000 Process Gas Chromatograph User Manual

Page 453

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<Appendix D Action of External Input and Output Signals>

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

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