Issue
No documentation available through regular sources.
Environment
GV Air flow Sensor:
63 mm 5515010063
80 mm 5515010080
100 mm 5515010100
125 mm 5515010125
160 mm 5515010160
200 mm 5515010200
250 mm 5515010250
315 mm 5515010315
400 mm 5515010400
Cause
Hard to find documentation on these sensors
Resolution
Data sheet is available here.
Mounting instructions here.