Badger Meter Positive Displacement - Manual (Page 4)

4
GENERAL DESCRIPTION
The Blancett B1750 positive displacement gear flow meters are
similar in design to the gear pump. The principle of operation is
reversed; instead of the gears driving the medium, the medium
drives the gears. A non-intrusive magnetic pick-up or hall-effect
sensor detects the movement of the gear and as each gear tooth
passes the sensor a square wave pulse is produced and a discrete
volume of liquid is measured. The resulting pulse train is
proportional to the actual flow rate and provides a highly accurate
representation of the fluid flow. All meters are designed with
highly wear resistant moving parts to provide exceptionally long
service life.
Filtration:
Depends upon model.
Fluid Compatibility:
The materials of construction include stainless steel or high
strength aluminum housings, stainless steel gears and either
tungsten carbide or stainless steel bearings (depending upon the
model). The fluids should be compatible with these materials.
INSTALLATION INSTRUCTIONS
The preferred flow direction is etched or marked by an arrow on
the meter as this is the flow direction in which the meter was
calibrated. However, the flow meters have bi-directional flow
capabilities. Damage will not occur from reverse flow, but the
meter will count reverse flow as forward flow. To prevent this
possibility, an in-line check valve may be a consideration.
The preferred orientation is to mount the meter vertically;
although horizontal mounting is acceptable if conditions deter
vertical orientation. There is no need for straight run piping
upstream or downstream of the flow meter.