Offset Calibration; Calibrating Relative Humidity (Rh) - Thermo Scientific 3110 Operating And Maintenance Manual

Section 2
Calibration
O

Offset Calibration

2
Calibrating Relative
Humidity (RH)
2-6 Water Jacketed CO Incubator
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Startup - Allow the cabinet to stabilize at least 12 hours before proceeding.
Operating Unit - Allow O
proceeding.
1. Measure the O2 concentration in the chamber through the gas sample
port with an independent instrument. Take several readings to ensure
accuracy.
2. Press the Mode key until the CAL indicator lights.
3. Press the right arrow until O2 OFFS XX.X% appears in the message
center.
4. Press the up/down arrow to adjust display to independent instrument
reading.
5. Press Enter to store calibration.
6. Press the Mode key to return to Run Mode.
All Model 3100 Series incubators can be equipped with an optional direct
readout relative humidity sensor. This is a readout only of the chamber
relative humidity. It does not provide any control of the relative humidity
in the cabinet.
Place the calibrated instrument in the center of the chamber. The
instrument should be in the airflow, not against the shelf. Before
calibration, allow the cabinet temperature to stabilize.
Startup - Allow 12 hours for the relative humidity and temperature in the
chamber to stabilize before proceeding.
Operating Unit - Allow at least 2 hours after temperature display reaches
setpoint for relative humidity to stabilize before proceeding.
1. Press the Mode key until the CAL indicator lights.
2. Press the right arrow key until RH CAL XX% appears in message
center.
3. Press the up/down arrow to match the display to the independent
instrument.
4. Press Enter to store the calibration.
5. Press the Mode key to return to Run Mode.
to stabilize at least 2 hours at set point before
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