Teledyne AX300-I - Medical application oxygen analyzer - Manual (Page 28)

Service Instructions AX300-I
Teledyne Analytical Instruments
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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.
3.5 Calibration
Incorrect readings can often be traced to improper calibration. The AX300-I
should be calibrated before each use and every 8 hours to maintain accuracy. It
must be calibrated whenever new sensor or batteries are installed. Calibration
using methods other than described in section 2.1.4 will lead to improper opera-
tion.
Whenever new batteries are installed or removed for any reason, the oxygen
analyzer defaults to the calibration mode with the LCD display flashing 00.0.
Only the CAL and ON/OFF (I/O) keys are functional at this point.
3.6 Factors Affecting Sampling Accuracy
Refer to Section 2.3 of this manual.
3.7 Troubleshooting
The AX300-I oxygen analyzer provides a variety of built-in safety features that
prevent its use when a fault is detected. When a unit displays the message √ SENSOR
and sounds the audible and visual alarm continuously, it is an indication of a faulty
connection between the sensor and the unit or an expired or faulty sensor. It also indi-
cates when oxygen concentrations are below 18%.
For assistance with troubleshooting, see Table 3-1.
Table 3-1 Troubleshooting
Symptom Why What To Do
New sensor responds
slow or drifts. If the sensor is new
and was just removed
from its sealed bag it
may need to run for
several hours. A) Wait 1–2 hours and recali-
brate.