Teledyne TED-200 - Medical application oxygen monitor - Manual (Page 22)

3 Maintenance and Troubleshooting
Teledyne Analytical Instruments 3-2
If the unit is left on after this, the LCD display will eventually shut down, the red LED
will stay lit, and the beeper will emit a continuous tone. If the batteries are still not replaced,
the LED and beeper will drain the remaining power and go completely dead.
If the TED 200-T will not be used for a period of 30 days or more, the batteries should
be removed prior to storage.
To replace batteries, see chapter 2, section 2.1.1. Remember, the unit must be calibrated
after the batteries are replaced.
3.3 Sensor Maintenance
DO: check the sensor for damage or leaks before use.
DO: recalibrate after replacing the sensor.
DON’T: immerse the T-7 sensor in liquid.
DON’T: autoclave the T-7 sensor.
DON’T: open or try to repair the sensor.
Before every use, the sensor, cable and connections should be checked. Check the
sensor for leaks and condensation. Check the cable for splitting or cracked insulation. Make
sure the connections are tight and dry.
In the event that the sensor has been damaged, consult the Material Safety Data Sheet in
the Appendix for handling guidelines.
To replace the sensor, see chapter 2, section 2.1.2.
3.4 Troubleshooting
The TED 200-T provides a variety of built-in safety features which prevent instrument
use when a fault or incorrect calibration procedure is detected. When a unit repeatedly
displays the messages REPLACE SENSOR or SEE TROUBLESHOOT, sounds/flashes
the alarms continuously, or refuses to turn on, it may be an indication of an erroneous cali-
bration, an intermittent or faulty connection, an expired sensor, or a low battery. To deter-
mine where the difficulty lies, refer to the following guidelines.
NOTE: The TED 200T Service Manual (P/N SMC41901.02) is available from the
factory and contains circuit diagrams, test procedures and other informa-
tion which will assist qualified technical personnel in repairing the Monitor.