App Note: Measuring Bidirectional Air Flow from Furnace Bellows
The flow meter is measuring the air flow to and from a contained furnace to help in maintaining consistent temperatures.
Using the bi-directional meter allows for the replacement of two individual flow meters and all the associated plumbing.
The temperature and pressure signals are also incorporated as safety checks.
Device accuracy is based on total span: ± (0.8% of reading + 0.2% of total span positive full scale to negative full scale)