Detcon 1000_CO2 - Manual (Page 19)

Model 1000 CO2
Model 1000 CO2 Instruction Manual Rev. 2.2 Page 15 of 28
6.0 Calibration
Model 1000 Series CO2 Process Analyzer is calibrated prior to shipment. Only minimal adjustment should be
required at time of commissioning.
IR-640/IR-642 Initial Calibration Recommendations:
A zero and span calibration should be performed at start-up to assure optimum system performance. After
that, a zero and span calibration interval of every 3 months is recommended.
6.1 IR-640/IR-642 CO
2
Sensor Calibration
Material Requirements
9 Detcon Part Number 327-000000-000 MicroSafe™ Programming Magnet
9 Span Gas containing the applicable CO
2
concentration in air. Span gas concentration is recommended at
50% of full-scale range (which is the factory default). Other concentrations can be used as long as they
fall within 10% to 90% of range.
9 Zero gas containing no CO
2
. Room air may be used as a zero gas.
Zero Calibration
Zero Calibration should be performed quarterly in the field.
1) If the ambient air is known to contain no combustible hydrocarbon gas content, it can be used to calibrate
zero. If a zero air or N2 gas cal cylinder is used, attach the gas to the CO
2
Calibration port of the 3-Way
Valve. Turn the 3-Way valve to Calibrate, and adjust the CO2 Gas Rotameter for a flow rate of
250cc/min. Allow the unit 5 minutes to stabilize before executing the AutoZero.
2) Enter the calibration menu by holding the programming magnet stationary over “PGM 1” (see above) for 3
seconds until the display reads “1-ZERO 2-SPAN”, and remove the magnet. Note that the “CAL” LED
comes on.
3) Enter the zero-menu by holding the magnet stationary over “PGM 1” for 3 seconds until the display reads:
“ZERO 0%”, and remove the magnet. The sensor has now entered the auto zero mode. When complete
the sensor will display “ZERO COMPLETE” for 5 seconds and then return to the normal operation
menu, “0.00 %CO2”.
4) Re-open the sample flow mass flow controller and re-establish the target sample flow rate per the arrow
indicator on the CO
2
sample Rotameter.
Span Calibration
Span gas cylinder containing CO
2
gas in background air as per the following range table. Background gas may
also be nitrogen.
CAUTION: Verification of the correct calibration gas level setting and calibration span gas concentration
is required before “span” calibration can be completed. These two numbers must be equal.
Calibration consists of entering the calibration function and following the menu-displayed instructions. The
display will ask for the application of span gas in a specific concentration. This concentration is equal to the
calibration gas level setting. The factory default setting for span gas concentration is 50% of full-scale range.
In this instance, a span gas containing a concentration equal to 50% of full-scale range is required. If a span
gas containing 50% of range is not available, other concentrations may be used as long as they fall within 10%
to 90% of range. However, any alternate span gas concentration value must be programmed via the calibration
gas level menu before proceeding with span calibration. Follow the instructions below for span calibration.