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Section 2
Calibration
Infrared CO
2
(continued)
Relative Humidity
2-4
Direct Heat CO2 Incubator
System
1. Measure the CO
sample port with a Fyrite or other independent instrument. Several
readings should be taken to ensure accuracy.
2. Press the MODE key until the CAL indicator lights.
3. Press the right arrow until "IR CAL XX.X" appears in the message
display.
4. Press the up/down arrow to adjust the display to match the
independent instrument reading.
5. Press ENTER to store the calibration.
6. Press the MODE key to return to RUN mode.
Model 3540 and 3541 incubators are equipped with an optional direct-
readout relative humidity sensor. This is a readout only of the chamber
relative humidity level. It does not provide any control of the relative
humidity in the cabinet.
Relative Humidity Stabilization Times
Start-Up - Allow 12 hours for the relative humidity and temperature in the
chamber to stabilize before proceeding.
Already Operating - Allow at least 2 hours after temperature display
reaches setpoint for relative humidity to stabilize before proceeding.
1. Place an accurate independent instrument in the center of the
chamber. Allow at least 30 minutes for RH to stabilize.
2. Press the MODE key until the CAL indicator lights.
3. Press the right arrow key until "RH CAL XX" appears in the message
display.
4. Press the up/down arrow to match the display to the independent
instrument.
5. Press ENTER to store the calibration.
6. Press the MODE key to return to RUN mode.
concentration in the chamber through the gas
2
Thermo Scientific
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