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| 51 |
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C.1.2 | HIGH TEMPERATURE |
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| Condition detected | Possible cause | F Action to take |
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| Airway temperature high alarm | Sudden spurious increase in gas flow. | Wait for temperature to fall below |
| activated. |
| threshold. |
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| Heater wire too close to temperature | Use shorter heater wire or lengthen |
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| probe. | inspiratory hose so that distance is |
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| between 25 (1”) and 100 mm (4”), ideally |
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| 30 mm. |
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| Possibly faulty EOH sensor on | Check probe, see § 6.4. |
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| temperature probe (low resistance). |
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| Chamber temperature high alarm | No water in chamber. | Refill humidification chamber. |
| activated. |
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| Possibly faulty TOP sensor on | Check probe, see § 6.4. |
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| temperature probe (low resistance). |
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C.1.3 | TEMPERATURE FLUCTUATING |
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| Condition detected | Possible cause | FAction to take |
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| High and low temperature | Ventilation rate too low or too erratic | Ventilation rates below about 6 bpm or of |
| alarms. | for proper humidifier temperature | a highly erratic nature may affect the |
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| control. | stability of the temperature control. |
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| Humidifier temperature control | Shield breathing circuit from external |
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| influenced by external heating or | influence. |
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| cooling such as air conditioner. |
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| Temperature probes incorrectly | Check temperature probe position in the |
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| positioned. | circuit. |
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| Possibly faulty temperature probe | Check probe, see Section 6.4. |
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| (Could be intermittent short or open | (Wriggle probe to pick up intermittent |
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| circuit). | |
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| faults). | |
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C.1.4 | EXCESSIVE WATER IN CIRCUIT |
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| Condition detected | Possible cause | FAction to take |
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| Excessive water in inspiratory | If in | Reposition water trap. |
| circuit due to rainout. | not at the lowest point of the circuit. |
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| If in heated wire mode, heater wire too | Increase distance from heater wire to |
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| close to temperature probe. | temperature probe so that the distance is |
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| between 25 (1”) and 100mm (4”), ideally |
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| 30mm. |
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| Inspiratory circuit being cooled by air | Shield circuit from air conditioner or use |
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| conditioner. | heater wire circuits. |
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| Chamber control set too high | Reduce setting. |
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| Maximum permissible peak flow rate of | Use correct chamber. Refer to the |
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| humidification chamber has been | operating instructions for the type of |
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| exceeded. | chamber used. |
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| Humidifier chamber tilted. | Ensure chamber is level. |
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| Possibly faulty temperature probe (low | Check probe, see § 6.4 |
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| resistance). |
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| Inspiratory heater wire not connected | Connect inspiratory heater wire. |
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| in a parallel wired dual circuit. |
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Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
