Infrared Co System - Thermo Scientific 370 Operating And Maintenance Manual

Section 2
Calibration
Infrared CO
2
(continued)
Relative Humidity
2-4 Steri-Cycle CO Incubator
2
System
1. Measure the CO
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. Press the Mode key to return to Run mode.
All Model 370/380 Series incubators can be 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
center.
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 sample
2
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