Infrared Gas Analyzer

Operation 4

 

 

 

 

 

 

 

 

 

Dpt

INPUT

OUTPUT

Ø

Ø.ØØ

Ø.ØØ

The leftmost digit (under Dpt) is the number of the data point being moni- tored. Use the UP/DOWN key to select the successive points.

The INPUT value is the input to the linearizer. It is the simulated output of the analyzer. You do not need to actually flow gas.

The OUTPUT value is the output of the linearizer. It should be the ACTU- AL concentration of the span gas being simulated.

If the OUTPUT value shown is not correct, the linearization must be correct- ed. ESCAPE to return to the previous screen. Select and Enter SET UP to Calibration Mode screen.

Select algorithm

mode : AUTO

There are two ways to linearize: AUTO and MANUAL: The auto mode requires as many calibration gases as there will be correction points along the curve. The user decides on the number of points, based on the precision re- quired.

The manual mode only requires entering the values for each correction point into the microprocessor via the front panel buttons. Again, the number of points required is determined by the user.

4.3.8 Troubleshooting information

AccessingtheHARDW_VARfunctionwillallowaqualifiedtechnician to get further information on the health of the analyzer. This is a complimentary troubleshooting tool to SELF-TEST. Information displayed in the VFD display is shownbelow:

Calib_factor = 5.00

(This is the slope calibration value of the span,

 

default is 5.00)

AtoD_ave = 1289

(This is the raw ADC count, -262144 to

 

262143 are acceptable raw counts but must still

 

be evaluated by knowing what gas is flowing

 

throughtheanalyzer)

lOffset[r][g] = 492

(This is the current zero offset from the zero

 

calibration of the gain and range the instrument is

 

on at the moment. It should be between

 

10,000 to 10,000)

Teledyne Analytical Instruments

4-11

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Teledyne 7300A manual Troubleshooting information