Teledyne gfc 7000ta operation manual Dilution Ratio, Primary Setup Menu

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer

6.8.7. Dilution Ratio

The dilution ratio is a software option that allows the user to compensate for any dilution of the sample gas before it enters the sample inlet. Using the dilution ratio option is a 4-step process:

1.Select reporting range units: Follow the procedure in Section 6.8.6.

2.Select the range: Use the procedures in Sections 6.8.2 – 6.8.5. Make sure that the SPAN value entered is the maximum expected concentration of the undiluted calibration gas and that the span gas is either supplied through the same dilution inlet system as the sample gas or has an appropriately lower actual concentration. For example, with a dilution set to 100, a 10 ppm gas can be used to calibrate a 1000 ppm sample gas if the span gas is not routed through the dilution system. On the other hand, if a 1000 ppm span gas is used, it needs to pass through the same dilution steps as the sample gas.

3.Set the dilution factor as a gain (e.g., a value of 20 means 20 parts diluting gas and 1 part of sample gas):

SAMPLE	RANGE = 500.000 PPM	CO2 =X.XXX
< TST TST > CAL		SETUP

	SETUP C.3			PRIMARY SETUP MENU
	CFG DAS RNGE PASS CLK MORE						EXIT
DIL only appears	SETUP C.3			RANGE CONTROL MENU
if the dilution ratio
option has been	MODE SET UNIT DIL						EXIT
installed								EXIT ignores the
								new setting.
Toggle these buttons to set the	SETUP C.3			DIL FACTOR: 1.0 GAIN				ENTR accepts the
dilution factor.	0	0	0	1	.0	ENTR	EXIT	new setting.
This is the number by which the
analyzer will multiply the CO2
concentrations of the gas passing	SETUP C.3			DIL FACTOR: 20.0 GAIN
through the reaction cell.
	0	0	2	0	.0	ENTR	EXIT

The analyzer multiplies the measured gas concentrations with this dilution factor and displays the result.

NOTE

Once the above settings have been entered, the instrument needs to be

recalibrated using one of the methods discussed in Section 7.

Teledyne Analytical Instruments 96