user manual

Calibration Procedures Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 172
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:
M-P CAL 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.
Wait until STABIL
falls be low 1.0 ppm.
This may take several
minutes.
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
Set the Display to show the
STABIL test function.
This function calculates the
stability of the CO
2
measurement
Continue Calibration as per
Standard Procedure
ZERO CAL M RANGE = 50 0.000 PPM CO2 =XXX.X
< TST TST > ZERO SPAN CONC EXIT
ANALYZER ENTERS
ZERO CAL MODE
SAMPLE RANGE TO CAL: LOW
LOW HIGH ENTR SETUP
SAMPLE RANGE TO CAL: HIGH
LOW HIGH ENTR SETUP
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.