Model 310 Series DH Incubator 4-3Thermo Scientific
Section 4
Alarms
Possible problems which cause this alarm are:
• Auto Zero pump, orifice, filter or tubing will not let air to the sensor.
Possibilities are:
Defective or electrically disconnected air pump
Kinked auto zero vinyl tubing
Disconnected tubing between the air pump and the sensor
Plugged filter or orifice on the auto zero assembly
Defective auto zero circuit
• Cabinet temperature has been increased significantly from a previous
setpoint. For example, the unit was calibrated and operating at 30°C
and the setpoint is increased to 50°C. In this example, calibrating the
CO
2 will correct the alarm.
• High background CO
2 in the laboratory. This could be from leaks in
the tank, regulator or vinyl CO
2 tubing.
• High CO
2 sensor calibration drift. This will require replacement of the
sensor.
• Calibration of the CO
2 system to less than 3% actual CO2. If this has
occurred, contact the Technical Services Department.
IR AUTOZ ERR
(continued)
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