Chapter 3: Calibration and Maintenance
SENSITIVE TO ELECTROSTATIC DISCHARGE CAUTION
An Electrostatic Discharge (ESD) Susceptibility symbol is displayed to alert service personnel that the
part(s) are sensitive to electrostatic discharge and that static control procedures must be used to
prevent damage to the equipment.
WARNING:
After performing any repair or calibration, always perform the Service Checkout Procedure before
putting the unit back into service.
3.1 Service Maintenance Schedule
The unit should be maintained in accordance with the procedures detailed in this manual. Service maintenance
must be performed by a technically competent individual.
This schedule lists the minimum frequencies. Always follow hospital and local regulations for required
frequencies.
Frequency Maintenance
Annually
• Perform the electrical safety and calibration procedure as described later in this chapter.
• If the unit is equipped with a scale, perform checkout procedures in Chapter 2. If the
scales fail the weight check, perform the scale calibration procedure in section 3.7.
• If the unit is equipped with Servo Controlled oxygen:
• Replace vent screen.
• Perform supply valve leak test.
• Replace sensors*. It is recommended both sensors be replaced at the same time.
*Sensor life of one year is approximate. If the sensor is used often at high oxygen concentrations, sensor life will
decrease.
Every Two
Years
• Replace the battery.
NOTE: The battery is used to sound the power failure alarm and to power memory circuits
during a power failure. Run the unit for at least two hours to charge the new battery before
using the unit. The battery charges only when the unit is powered on.
Every Three
Years
Calibrate the humidier.
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