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3.1.3 Dual Range Calibration
If the analyzer is being operated in Dual Range mode or Auto-Ranging mode, then the
High and Low ranges must be independently calibrated. When the analyzer is in Dual or
Auto Range mode you will be prompted to enter the range to calibrate whenever you
enter a calibration command from the front panel. Press HIGH or LOW followed by the
ENTR button to proceed with the calibration. To calibrate the other range you must exit
to the sample menu and restart the calibration. See Section 4.6 for more information on
the Range Modes. The following procedure shows an example of how to calibrate the
two ranges with calibration gas coming in through the sample port:
Step Action Comment
1. Press CAL Analyzer enters M-P calibration mode. Calibration gas
source should be set to deliver zero gas to the sample port.
2. Press LOW-ENTR Select range to calibrate
3. Wait 15 min. Wait for CO reading to stabilize at zero value.
4. Press ZERO-ENTR Changes calibration equations for Low range so analyzer
will read zero.
5. Press CONC Enter span gas concentration for Low range.
6. Key in span
concentration
Enter span gas concentration for Low Range. Set
calibration gas source to deliver span concentration
7. Press ENTR
8. Wait 15 min. Wait for CO reading to stabilize at span value
9. Press SPAN-ENTR Changes calibration equations for Low range so analyzer
will read span value.
10. Press EXIT Exits back to sample menu
Repeat steps 1-10 for High range.
3.2 IZS zero/span check (Option)
If the IZS (Internal Zero Scrubber) option has been installed and a source of CO span gas
has been connected, the operator can check the zero and span setpoints of the analyzer at
any time by pressing the CALZ or CALS button.
Pressing CALZ switches the Sample/Cal valve and allows the analyzer to draw air
through the zero air scrubber. After a few minutes the CO reading should go to zero. If
it doesn't, the operator may press the ZERO button followed by ENTR.
CALS works like CALZ except that externally supplied span gas is drawn through the
analyzer. After a few minutes the CO reading should approach the span level (typically
40 PPM). If it doesn't, the operator may press the SPAN button, followed by ENTR.
The expected span gas concentration may be changed by pressing the CONC button.
The operator can exit the IZS calibration only by pressing the EXIT button. If either the
ZERO or SPAN buttons were pressed and ENTR was not pressed, the Analyzer will
beep once to indicate that no changes have been made.
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 32