Frequently Asked Questions  Date  HT50    Adjusting Baseline (PEEP) Pressure: Built-In Servo Control Of Peep How does the HT50 servo-control the baseline pressure (PEEP)? 3/25/2003        Adjusting Baseline (PEEP) Pressure: Handling Breathing Circuit/Airway Leaks How does the HT50 compensate for leaks and keep baseline (PEEP) stable? 3/14/2003        Adjusting Pressure Support /Pressure Control On some ventilators there is an adjustment for termination percent for pressure control/pressure support breaths. Is this adjustment available on the HT50? 3/25/2003 Why isn’t my tidal volume the same at the same pressure control level on the HT50 as it is on my other ventilator? 3/25/2003 Are there specific factors that are controlled by the ventilator itself that may affect tidal volume delivery in pressure control? 3/25/2003        Adjusting Tidal Volume Will adjusting inspiratory time affect my tidal volume setting in volume control? 3/14/2003        Adjusting Trigger With PEEP How do you adjust trigger to accommodate changes in PEEP setting? 3/14/2003        Air Oxygen Entrainment Mixer: Why Optional? I see that the HT50 Air/Oxygen Entrainment Mixer looks very simple, and it is an optional accessory, Why? 3/25/2003        Back Up Ventilation How does back up ventilation work? 3/14/2003        Battery:Internal Battery Performance & Lifespan Why doesn’t my internal battery power my HT50 with average ventilation settings for 10 hours? 3/14/2003        Battery:Internal Battery Sometimes when I switch from AC – DC – AC it takes up to a minute for the Internal Battery light to go out. Why? 3/25/2003        Battery: External Battery In addition to the internal battery can the HT50 run off an external battery in the case of extended power failures etc.? 3/25/2003        Battery: External Battery, Cigarette Lighter Cord In addition to the excellent internal battery time can the HT50 be run from a car's cigarette lighter? If so, does the internal battery charge while doing so? 3/25/2003        Battery: Internal Battery Replacement Interval How often do you need to replace the HT50 internal battery? 3/14/2003        Battery: Internal Battery, Charge Time From AC Power How long does it take to charge the HT50 from AC power? 3/14/2003        Battery: Internal Battery, Charge Time From Cigarette Lighter Cord How long does it take to charge the HT50 from the auto lighter DC power cord? 3/14/2003        BiPAP (Mask Ventilation) Can I use the HT50 to deliver BiPAP? 3/14/2003        Breathing Circuit:Proximal Pressure Inline Filter Why do I need to place a filter inline with the proximal pressure tubing? 3/14/2003 What happens if my proximal inline filter is contaminated/occluded by fluid in the proximal tubing? 3/14/2003        Breathing Circuit: Configuration How is the HT50 Breathing Circuit Configured? 3/14/2003        Breathing Circuit: Disposable Circuit Can I use a disposable breathing circuit on the HT50? 3/14/2003        Breathing Circuit: Continuous Flow Does the HT50 provide continuous flow through the circuit for the pediatric patient to breathe from spontaneously if the patient fails to trigger the ventilator? 3/28/2003        Durability: Construction? Durability: Is the outside case on the HT50 Ventilator durable? 3/14/2003        Exhalation Valve Calibration Why do I have to calibrate the exhalation valve? 3/14/2003 How do I calibrate the exhalation valve? 3/14/2003        Exhalation Valve Calibration Failure What do I do if my exhalation valve calibration fails? 3/14/2003        Exhalation Valve: Calibration How often should I calibrate the HT50 exhalation valve? 3/14/2003        Humidification: Built-In Humidifier In some cases my humidifier does not heat up to the set temperature. Why? 3/14/2003 How do I prepare the humidifier for patient use? 3/14/2003 How often should I fill the humidifier? 3/14/2003 When the HT50 with humidifier for home use is being used in a vehicle, can the humidifier also be run? 3/25/2003        Humidification: HME/HCH Is it possible to use a heat moisture exchanger (HME) or hygroscopic condensing humidifier (HCH) wit 3/14/2003        Inspiratory Pause Inspiratory Pause: How do you perform an end inspiratory pause how do you read the pause pressure? 3/25/2003        Monitors: Paw Meter Why does the needle on the Paw meter bounce down below the PEEP level at the end of inspiration when I am using a disposable breathing circuit? 3/25/2003        Monitors: Pressure How is pressure measured? 3/14/2003        Monitors: Update Of Monitored Data How are the pressure and volume monitoring displays updated? 3/14/2003        Monitors: Volume How is volume measured? 3/14/2003        Nebulizing Medications Inline How will an inline pneumatic medication nebulizer (powered by an external flow source) affect patient ventilation? 3/25/2003 What precautions should I take to protect the exhalation valve in the breathing circuit from the nebulized medication residue? 3/25/2003        Patient Size >10 Kg Why is the HT50 marketed for patients <10 kg patients even though it has pressure controlled ventilation? 3/25/2003        Vibration/Noise Why does the HT50 Ventilator make a vibration noise? 3/14/2003        Breathing Circuit: Leak How does the HT50 handle leaks in the airway/breathing circuit? 3/14/2003      HT50 - Technical/Service Related Questions    Air Oxygen Entrainment Mixer: FIO2 Accuracy Why is the accuracy of the air oxygen entrainment mixer +8% and not +3%? 3/14/2003        Battery: Internal Battery Lifespan Why doesn’t my internal battery power my HT50 on average settings for 10 hours? 3/14/2003        Calibration: Flow Why do I have to do a flow calibration? (i.e., Volume Factor) 3/14/2003        Calibration: Pressure How do I re-zero the HT50’s pressure transducers? 3/14/2003 Why do I have to calibrate the pressure? 3/14/2003        Monitors: Accuracy What is the accuracy of monitored data? 3/14/2003        Monitors: Paw Meter The needle on my Paw meter seems to move erratically. 3/14/2003           Calibration: Flow Why is it necessary to use an RP50 at the patient connection of the breathing circuit during a flow calibration? 3/25/2003

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