Teledyne gfc 7000ta operation manual Zero/Span Calibration on Auto Range or Dual Ranges

Calibration Procedures Model GFC7000TA Carbon Dioxide Analyzer

7.5.1. Zero/Span Calibration on Auto Range or Dual Ranges

If the analyzer is being operated in dual range mode or auto range mode, then the high and low ranges must be independently calibrated.

When the analyzer is in either dual or auto range modes the user must run a separate calibration procedure for each range. After pressing the CAL, CALZ or CALS buttons the user is prompted for the range that is to be calibrated as seen in the CALZ example below:

ANALYZER ENTERS ZERO CAL MODE

SAMPLE*	RANGE = 500.000 PPM			CO2 =XXX.X
<TST TST>	CAL	CALZ	CALS	SETUP
SAMPLE	STABIL=XXX.X PPM			CO2 =XXX.X
< TST TST > CAL		CALZ	CALS	SETUP

ACTION:

Allow zero gas to enter the sample port at the

rear of the instrument.

M-P CAL	STABIL=XXX.X PPM		=XXX.X
< TST TST >	CAL CALZ	CALS	SETUP
SAMPLE	RANGE TO CAL: LOW
LOW HIGH		ENTR	SETUP
SAMPLE	RANGE TO CAL: HIGH
LOW HIGH		ENTR	SETUP
ZERO CAL M	RANGE = 500.000 PPM CO2 =XXX.X
< TST TST > ZERO SPAN		CONC	EXIT

Set the Display to show the STABIL test function.

This function calculates the

stability of the CO2

measurement

Wait until STABIL falls below 1.0 ppm.

This may take several

minutes.

Continue Calibration as per

Standard Procedure

Once this selection is made, the calibration procedure continues as previously described in Section 7.2. The other range may be calibrated by starting over from the main SAMPLE display.

Teledyne Analytical Instruments 172