Calibrating The Temperature; Calibrating T/C Co System - Thermo Scientific 3110 Operating And Maintenance Manual

Section 2
Calibration
Calibrating the
Temperature
Calibrating T/C CO
2-2 Water Jacketed CO Incubator
2
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.
Start-Up - Allow 12 hours for the temperature in the cabinet to stabilize
before proceeding.
Operating Unit - Allow at least two hours after the display reaches setpoint
for the temperature to stabilize before proceeding.
1. Press the Mode key until the CAL indicator lights.
2. Press the right arrow until TMPCAL XX.XC appears in the message
center.
3. Press the up/down arrow to match the display to a calibrated
instrument.
4. Press Enter to store the calibration into memory.
5. Press the Mode key to return to Run, or the right/left arrow to go to
the next/previous parameter.
Models 3110, 3111, 3130 and 3131 have a thermal conductivity (T/C)
2
CO sensor. Thermal conductivity of the incubator atmosphere is not only
System
2
effected by the quantity of CO
and the water vapor present in the incubator atmosphere. In monitoring
the effects of CO
constant so any change in thermal conductivity is caused only by a change
in CO
2
Any changes to the temperature setpoint and/or humidity level control
method (humidity pan location, capping ports, HEPA filter type) will
necessitate a recalibration of the CO
Some T/C CO
installations. Calibration should be checked on a weekly basis, and
adjusted as necessary. When stabilization occurs, checks can become less
frequent.
, air temperature and absolute humidity must be held
2
concentration.
sensors go through an aging period, especially on new
2
present, but also by the air temperature
2
control.
2
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