Calibrating Relative
Humidity
1. Measure the CO2 concentration in the chamber through the gas
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
center.
4. Press the up/down arrow to adjust the display to match the
independent instrument reading.
5. Press Enter to store the calibration.
6. After Enter is pressed, the unit will go into a calibration cycle that will
last 5 to 6 minutes. The control panel is locked during this cycle.
7. Press the Mode key to return to Run mode.
All 310 Series incubators can be equipped with an optional direct readout
relative humidity (RH) 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.
2-4 Model 310 Series DH Incubator Thermo Scientific
Section 2
Calibration
Calibrating the IR CO2
System (continued)
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