Discussion Overview
The discussion revolves around selecting a suitable pressure sensor for an environment with specific conditions: operating between 1 and 3 bar absolute, at temperatures ranging from 10 to 125°C, and 100% humidity. Participants explore options for small sensors, ideally with a digital interface, while considering budget constraints and the need for temperature compensation.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant seeks a small pressure sensor with a port size no larger than 1/4" and expresses a preference for a digital interface, although it is not critical.
- Another participant questions whether the 125°C temperature refers to the ambient environment or the fluid being sensed.
- A participant clarifies that the sensor will be mounted on the exterior of a metal vessel containing hot vapor, indicating that the vessel will be close to the same temperature as the fluid.
- There is a discussion about the meaning of a digital interface, with one participant suggesting it could refer to either a pressure switch or an analog pressure transducer with a digital output.
- One participant mentions that 125°C is barely achievable with affordable analog pressure sensors and references the ProSense series as an example.
- Another participant suggests that if fast dynamic pressure changes are not a concern, the sensor could be mounted away from the pressure vessel and connected via a suitable tube, describing common practices from historical steam technology.
- Concerns are raised about using a pigtail isolation method, as one participant worries it might perturb the system significantly due to the small chamber size.
- A participant inquires about the required frequency response of the sensor.
- It is noted that the pressure will vary relatively slowly, with a response time of 100ms deemed adequate by one participant.
Areas of Agreement / Disagreement
Participants express various viewpoints regarding the specifications and requirements for the pressure sensor, with no consensus reached on a specific model or approach. The discussion includes both technical considerations and differing opinions on sensor placement and design.
Contextual Notes
Participants discuss the limitations of sensor capabilities at high temperatures and humidity, as well as the potential impact of sensor placement on system performance. There are unresolved questions regarding the best approach to meet the specified requirements.