Quick answer: This is the genuine ResMed expiratory flow sensor for the Astral ventilator (part 27936). It measures the flow of exhaled air on the expiratory side of a double-limb circuit, allowing the device to monitor exhaled volume and detect leaks accurately. It's a consumable component used with the Astral's double-limb setup and is replaced periodically or when damaged. Use as directed by the patient's clinical team.
What's included
- 1 × ResMed Astral expiratory flow sensor (part 27936)
Circuit, adapter, and other components sold separately. Confirm the exact pack quantity against your order.
About this part
When the Astral is used with a double-limb circuit, exhaled air returns to the device through a separate expiratory limb. The expiratory flow sensor sits in that path and measures the exhaled flow, giving the ventilator the data it needs for accurate monitoring — including exhaled tidal volume and leak detection — and for its alarm functions. Because the sensor is exposed to exhaled, humidified air, it's a wear component: it should be inspected regularly and replaced per the Astral clinical guide or when performance is affected. After changing circuit components, the Astral requires a "learn circuit" procedure so the device recalibrates to the new setup.
Key features
- Genuine ResMed part (27936) — designed for the Astral ventilator.
- Measures exhaled flow — supports accurate volume monitoring and leak detection.
- For double-limb circuit setups — used on the expiratory side.
- Replaceable consumable — swap out when worn or damaged.
- Clinician-directed use — fit and verify per the Astral clinical guide.
Specifications
| Specification | Detail |
| Product type | Expiratory flow sensor |
| Compatible ventilator | ResMed Astral series |
| Used with | Double-limb circuit configuration |
| Function | Measures exhaled flow for monitoring and alarms |
| Included | Sensor only |
| ResMed reference / SKU | 27936 |
| Prescription | Required — clinician-directed |
| Brand | ResMed |
Setup & care notes
Fit the sensor per the Astral clinical guide and confirm correct orientation. After installing a new sensor or changing any circuit component, run the learn circuit procedure so the ventilator recalibrates. Do not attempt to modify the sensor. Inspect it regularly for damage or moisture ingress, and replace it according to the clinical documentation or if monitoring appears inaccurate.
Frequently asked questions
What does the expiratory flow sensor do? It measures the flow of exhaled air in a double-limb circuit, giving the ventilator accurate data for exhaled volume monitoring, leak detection, and alarms.
When is it used? In double-limb circuit configurations on the Astral, on the expiratory side of the circuit.
How often should it be replaced? It's a wear component — replace it per the Astral clinical guide, or sooner if it's damaged or monitoring seems inaccurate.
Do I need to do anything after replacing it? Yes — run the Astral's "learn circuit" procedure so the device recalibrates to the circuit.
Do I need a prescription? Yes — ventilator components are used under clinical direction. Confirm your setup with your provider.
Can I get it delivered in Brooklyn or shipped nationwide? Yes — Task Supply Corp offers USPS shipping throughout the continental U.S., plus local pickup and delivery in Brooklyn and all five boroughs of New York City.
This is a prescription medical device component for use under clinical direction. Follow the Astral clinical/user guide and your healthcare team's instructions, including the required "learn circuit" procedure after any circuit change.