Service Manual |
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Symptom | Why | What To Do | |
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| the reading again. | |
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| E) Try calibrating with a known | |
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| good sensor; if this fails, see | |
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| symptom "Reading drifts | |
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| over | |
The sensor does not | Water is condensing | A) Remove the sensor from tee | |
react to changes in | on the sensing | adapter and unscrew the | |
oxygen concentration, | surface. | plastic flow diverter. Using | |
or the readings are | Electrical interference | absorbent tissue or cotton | |
unstable and drifting. | swab, gently wipe off sensing | ||
is disrupting the | |||
| surface inside threaded | ||
| electronics | ||
| portion of sensor assembly. | ||
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| B) Relocate unit away from | |
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| sources of electrical noise | |
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| such as cauterizing equipment | |
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| and | |
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The display is flashing | The unit has detected | A) Check sensor cable | |
√ SENSOR | a fault in the signal | connections and make sure | |
from the sensor. | they are completely | ||
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| Sensor has expired. | inserted into the mating | |
| connector and the capture | ||
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| The sensor has been | nut is firmly in place. | |
| exposed to a gas | B) Expose the sensor in 100% | |
| containing little or no | ||
| O2 and check calibration. | ||
| oxygen. | ||
| C) The sensor output has | ||
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| fallen to a level where it is | |
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| no longer usable. Replace | |
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| sensor. | |
The oxygen reading | Like all O2 sensors, | A) During calibration, make | |
fluctuates or appears to | the R17MED detects | sure there is no restrictions | |
be incorrect. | the changes in the | on exhaust side of sensor. If | |
| partial pressure of | the reading changes with | |
| O2. | flow, the sensor is | |
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| pressurized or there may be | |
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| a leak in the system. | |
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| B) If a high degree of accuracy | |
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| is desired, or the | |
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| concentration of O2 is in | |
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| excess of 40%, calibration | |
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| with 100% is recommended. | |
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| C) If humidified gas is used to |
Teledyne Analytical Instruments | 38 |
