Portable Oxygen Monitor | Service Manual | |
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Symptom | Why | What To Do |
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| ventilate the patient, water |
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| vapor actually dilutes the |
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| gas. See Appendix: |
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| Humidity, Temperature. |
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| D) If a blender is used, check |
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| its calibration. See |
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| Appendix: Discrepancy in |
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| Readings. |
The unit has stopped | The | A) Disconnect the batteries and |
working and the LCD is | instruments are | inspect the contacts for |
displaying | equipped with an | corrosion. Reconnect the |
alphanumeric figures. | electronic "watch dog," | batteries. If the unit functions |
| which monitors the | properly, calibrate the unit |
| circuitry within the unit | and reset the alarm values. |
| for potential faults and | B) Try a new set of batteries. |
| renders the unit | |
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| inoperable until the | C) Increase the distance |
| condition is corrected. | between the unit and any |
| (See Watch dog | source of radio frequency |
| section below) | interference. The sensor |
| Several conditions | cable is a prime source of |
| pickup as it can act like an | |
| can activate the | |
| antenna. Relocate the | |
| "watch dog." | |
| sensor cable and if possible | |
| Dropping the unit, | |
| change its coiled length to | |
| poor battery | |
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| connections, and | |
| Placing the cable in a | |
| radio frequency | |
| different position may also | |
| interference are the | |
| help. | |
| most common | |
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| causes. See the |
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| watch dog section for |
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| additional information |
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Alarm sounds/flashes | A) Readings are | A) Adjust high and low alarm |
continuously. | outside alarm | setting to be above and |
| limits. | below O2 value being |
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| displayed. |
No display. | A) Batteries expired. | A) Check/replace batteries. |
| B) Bad battery | B) Check battery connections. |
| connection. | C) Calibrate. |
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Keys inoperable/cannot | The LOCK/UNLOCK | A) Press LOCK/UNLOCK key |
turn unit off | key is activated which | once. LCD will flash |
| is preventing key | indicating keys are active. |
| operation |
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Teledyne Analytical Instruments | 39 |