Emerson I-0021 Manuel D’Utilisation

90003482(2) [NGA-e (MLT-Software 3.2.X)] 07/98

NGA 2000

♦ 

You have three channels in your analyzer: CO, SO

2

 and O

2

.

♦ 

You want to write a program for the zero and span gas calibration.

♦ 

The valve gear is:

So you have the following zero and span gas for each gas component:

Zero gas:

O

2

O

2

CO/SO

2

Span gas:

CO/SO

2

CO/SO

2

O

2

So you have the following logical combination of the valves:

With the conditions described you will get the following program:

Step-

No.

Code Function/Parameter

1

-2

OR (Combination of the next three operands)

2

112

Zero gas calibration of channel 1

3

162

Zero gas calibration of channel 2

4

218

Span gas calibration of channel 3

5

-5

STORE (Saving the intermediate result to the result buffer)

6

40

Output result buffer 1

7

-6

CLEAR (Deleting the intermediate result of the calculator)

8

-2

OR (Combination of the next three operands)

9

118

Span gas calibration of channel 1

10

168

Span gas calibration of channel 2

11

212

Zero gas calibration of channel 3

12

-5

STORE (Saving the intermediate result to the result buffer)

13

41

Output result buffer 2

14

-6

CLEAR (Deleting the intermediate result of the calculator)

15

-7

END (End of program)

Sample

CO/SO

2

O

2

CO/SO

2

/O

2

Or

O

2

 Valve

Zero-Cal. Channel  1

Zero-Cal. Channel  2

Span-Cal. Channel  3

PLC Output 1

Or

CO/SO

2

 Valve

Span Cal. Channel  1

Span Cal. Channel  2

Zero Cal. Channel  3

PLC Output 2