Teledyne TED-200 - Medical application oxygen monitor - Manual (Page 21)

Maintenance and Troubleshooting 3
3-1 Teledyne Analytical Instruments
Maintenance and Troubleshooting
3.1 TED 200-T Overall Maintenance
The TED 200-T unit itself requires very little maintenance, other than calibration,
checking and changing the batteries and sensor, and cleaning the plastic housing, which
can be done with isopropyl alcohol. Should any part of the instrument malfunction or
fail to perform, the unit should be removed from service. The unit is not user-service-
able.
3.2 Battery Maintenance
DO: Test batteries regularly (replace immediately when indicated).
DO: Always use alkaline batteries.
DO: Recalibrate after replacing batteries.
To test the batteries, press the BATT TEST button once. The display will show
BATTERY HOURS LEFT (to a maximum of 999 hours) of remaining battery life.
This value is only a guide. Excessive alarm activation will wear down the battery faster
than usual. Should the remaining battery life reach 24 hours, the alarms will activate and
the screen will display LOW BATTERY.
Note: The TED 200-T is designed to automatically check its battery life once
per hour. When setting the HI/LO alarms or checking the batteries, the
unit will freeze the oxygen reading momentarily.
The minimum detectable change in battery voltage corresponds to an increment of
about 50 hours, meaning that the battery voltage reading may not change for several
hours at a time.
When the battery voltage becomes low, a LOW BATTERY message will flash on
the display until the batteries are replaced. If there are only 24 hours remaining and the
batteries are not replaced, the screen will blank except for a LOW BATTERY message.
The unit will beep and flash continuously.