Calibrating Infra-Red Co System; Calibrating The O2 System - Thermo Scientific 3110 Operating And Maintenance Manual

Calibrating T/C CO
System (continued)
Calibrating Infra-Red
CO
2
Thermo Scientific
Start-up - The CO
2
Allow temperature, humidity, and CO
at least 12 hours before checking the CO
pendent instrument.
Presently operating - Make sure the chamber doors are closed. Allow at
least 2 hours after the temperature and CO
points for chamber atmosphere stabilization.
1. Measure the CO
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 CO2CAL XX.X% is displayed in the
message center.
4. Press the up/down arrow to change the display to match the
independent instrument.
5. Press Enter to store calibration.
6. Press the Mode key to return to Run Mode, or the right or left arrow
keys to go to the next/previous parameter.
Models 3120, 3121, 3140 and 3141 have an infra-red CO
red CO
System
humidity. However, the light detector in the sensor is affected by wide
temperature changes. Therefore, changing temperature setpoints could
necessitate a recalibration of the IR CO
temperature should be allowed to stabilize before checking CO
concentrations with an independent instrument, especially on start-up.
All models equipped with an IR CO
that occurs every 24 hours, and lasts for 5 to 6 minutes. During automatic
calibration, the CO
pumped through the CO
memory for use as the 0.0% CO
panel is locked during calibration, with the message center reading CO2
AUTO CAL.
sensor has been calibrated at the factory for 37°C.
2
concentration in the chamber through the gas
2
sensors are not affected by chamber atmosphere, temperature or
2
display is blanked out and HEPA filtered room air is
2
sensor. A new CO
2
levels in the chamber to stabilize
2
concentration with an inde-
2
displays reach their set-
2
sensor before use. Chamber
2
sensor have an automatic calibration
2
calibration value is stored in
2
reference point. The keypad/ control
2
Water Jacketed CO
Section 2
Calibration
sensor. Infra-
2
2
Incubator 2-3
2