I am wondering if anyone has experience in looking for multi-channel differential pressure scanners for use with pitot static probes in aerospace? What companies/manufacturers/product familes would you recommend, as I am struggling to find any that meet all my requirements. My application requires differential pressure sensing up to 30 kPa of 7 pressure ports and absolute sensing of one port up to 1bar with accuracies <= 0.1% FS. As the max altitude is 100km it must be able to output differential measurements in essentially a vacuum (0.5kPa static pressure). As far as I can tell this requires the use of a true differential scanner, as absolute scanners generally have a lower pressure limit.
Space and weight are a concern (ideally <<250 grams), hence why I am opting to look for multi-channel pressure scanners rather than individual pressure sensors. These are the companies I have found so far that almost meet my requirements but not quite:
- Chell Instruments NanoDAQ-LTS model: This is a 16 channel absolute pressure scanner with great size, weight, accuracy values. However, lower pressure limit of 12 kPa, so can only work up to 15km altitude.
- EvoScann P8-D: 8 channel true differential model with good accuracy, weight, and space, but only rated up to 20 kPa differential pressure.
- Microscanner 16MS: 16 channel. Unsure if this is true differential or absolute, but seems to require a data system to interface with (big and bulky, dont meet weight requirement)
- Texense 8xPDIF-S: 8 channel true differential, but ±0.5% FS accuracy, ±0.7% hysteresis, ±0.5% drift. So not accurate enough.
- Keller series PD-10LX: Single differential pressure sensor model. good accuracy and reasonable size but accuracy is only rated down to 10 kPa line pressure.
Any extra manufacturers or products I might not have considered would be greatly appreciated! Or if you have worked a similar problem before and think that it is only solvable if I relax a requirement (e.g. size, weight, accuracy, pressure limit etc) please let me know.
