Help ID this sensor from CPAP machine

In summary, during the conversation, it was mentioned that two sensors were found in an air conduit of a CPAP humidifier, spaced 5 cm apart and located in the center of the conduit. These sensors were identified as temperature sensors, specifically thermistors. It was also suggested that one sensor could be used to find baseline temperature while the other is heated to infer flow. The purpose of these sensors is likely for flow measurement.
  • #1
mishima
570
36
I was taking apart a CPAP (continuous positive airway pressure) humidifier earlier and found 2 of these sensors spaced around 5 cm apart from each other. They were in an air conduit leading from a filter material on the outside of the device to the pump intake. The points of the sensors were more or less in the center of the conduit. Any ideas?

sensor.jpg
 
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  • #3
Thanks for that perfect reference, and it makes sense. I was guessing it was related to air quality. I will put it on an instrumentation amp later.

Edit: actually just an ohmmeter would reveal its character
 
  • #4
Yep, classic mass flow meter.
Sometimes one is used to find baseline temperature while the other is driven hard to heat, such as in an anemometer. Other times, both are heated, but their orientation in the air stream gives preferred heat transfer to one or the other depending upon flow direction.
 
  • #5


Based on the information provided, it is likely that these sensors are flow sensors. Flow sensors are commonly used in CPAP machines to monitor the air flow and pressure delivered to the patient. The placement of the sensors in the air conduit and their proximity to the filter material and pump intake suggest that they are used to measure the air flow and ensure that it is at the desired level. Further examination of the sensors and their specifications would be needed to confirm their exact function in the CPAP machine.
 

Related to Help ID this sensor from CPAP machine

1. What is a CPAP machine and why is it important?

A CPAP (continuous positive airway pressure) machine is a medical device used to treat sleep apnea, a condition that causes a person to stop breathing repeatedly while sleeping. It delivers a constant flow of air pressure through a mask to keep the airway open and prevent interruptions in breathing, promoting better sleep and overall health.

2. What is the purpose of the sensor in a CPAP machine?

The sensor in a CPAP machine detects changes in breathing patterns and adjusts the air pressure accordingly. This ensures that the user receives the correct amount of pressure to keep their airway open and prevent sleep apnea episodes.

3. How does the sensor work within the CPAP machine?

The sensor typically consists of a pressure transducer or a flow sensor, which converts physical changes in air pressure or airflow into an electronic signal. This signal is then sent to the CPAP machine's computer, which adjusts the air pressure to maintain a constant flow based on the user's breathing patterns.

4. Is the sensor specific to each CPAP machine or can it be used interchangeably?

The sensor used in a CPAP machine is typically specific to that particular model or brand. Each machine may have a different type of sensor or require a specific type of sensor to function properly. It is not recommended to use a sensor from one CPAP machine in another as it may not be compatible and could potentially cause harm.

5. How can I identify the sensor in my CPAP machine?

The best way to identify the sensor in your CPAP machine is to consult the user manual or contact the manufacturer directly. They will be able to provide you with specific information about the sensor used in your machine and any other relevant details.

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