5.1 Analyzer Module Setup

5.1.7 Programmable Calculator

·You have to set each operator in the line above the corresponding variable. After each calculating step you have to store the intermediate result and to delete the memory before you will continue with the next step. Each program must end with the command "End of program".

3)Putting in the constants:

·Press the 8 -key or the → -key in the line "Constants..." of the menu "Programmable

Calculator" to change to the corresponding submenu, where you can define maximum four constants, e.g. conversion constant from ppm to mg/m3.

4)Determination of the units:

·Press the 8 -key or the → -key in the line "Units..." of the menu "Programmable

Calculator" to change to the submenu "Calculator Result Units" to determine in which unit the calculator's result shall be displayed, e.g.ppm, mg/Nm3, Vol.% and so on.

·Note: This step can also be changed after the program is still running.

5)Scaling

·Via the line "Scaling..." of the menu "Programmable Calculator" you can change to a submenu, where you can determine the minimum and maximum for each result. This will be necessary, if you want to show the calculator'sresult in the single component display. The minimum/maximum values are the limits of the bargraphs.

6)Starting the program:

·Select "Enabled" in the line "Calculator is" of the menu "Programmable Calculator".

7)Check the results:

·The results of each calculator will be displayed in the last four lines of the menu "Programmable Calculator".

Example for the calculation with a program:

You want to calculate the whole content of NOx as NO2 in mg/m3 from the concentrations of NO in ppm (Channel 1) and of NO2 in ppm (Channel 2). So you have to add the single concentrations and then to multiply with a constant:

(ppm NO + ppm NO2) · "conversion constant (here: 2,05 mg/ml)" = NOx as mg/m3 NO2

So you will get the following program:

Step-

Code

Program Description

No.

 

 

1

-1

Add to intermediate result (At the beginning the memory is zero)

2

5

NO-Concentration from channel 1 (ppm)

3

-1

Add to IR (the concentration of channel 1)

4

10

NO2-Concentration from channel 2 (ppm)

5

-13

Result of the addition to memory and set IR = 0

6

1

Result 1

7

-9

Add memory to IR (= sum of NO and NO2 in ppm)

8

1

Result 1

9

-8

Multiply IR with constant ([ppm NO + ppm NO2] · "conversion constant")

10

1

Result 1 (= "conversion constant" ppm to mg/m3, here: 2,05 mg/ml)

11

-14

Store IR to result and set IR = 0

12

1

Result 1 (= mg/m3 NO2)

13

-17

End of program

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

NGA 2000

5 - 47