25
TELEDYNE ELECTRONIC TECHNOLOGIES
Analytical Instruments
SECTION ELEVEN DISCREPANCY IN
READINGS
The TED 191 is intended to be used as a secondary oxygen monitor, meaning that it is intended
to verify the accuracy of and check the oxygen concentration leaving anot her oxygen mixing
device or primary life support system (i.e a blender or anaesthesia machine). W henever there is a
significant difference in the oxygen readings between the prim ary and secondary monitors, the
discrepancy must be resolved immediately. The information obtained from the TED 191 should
never be used to make adjustments to the primary life-support system , but should only be used as
an indication that the primary device may require service and/or c alibration.
The "LO BAT" message immediately tells you if the batteries need replaci ng. The TED 191 should
momentarily be removed from the application area and the batteries r eplaced. If the TED 191 can
be calibrated, the unit can be assumed to be in good working order and c apable of providing
readings to specification. If after re-installing the TED 191, the discrepancy in ox ygen readings
persists, the problem is most likely elsewhere (i.e flow block age, primary device error, etc.).
Further investigation should be made until the discrepancy in re adings is resolved.
If it is found that replacing the sensor and/or batteries does not give proper calibration results, the
troubleshooting section of this manual should be consulted.