Abstract: A pressure sensor assembly, which includes a pressure sensing element having a diaphragm, a plurality of piezoresistors connected to the diaphragm, and at least one layer of sealing glass connected to the diaphragm. The pressure sensor assembly also includes a base, a layer of sealing glass is connected to the base, and is configured to maximize the sensitivity of the plurality of piezoresistors via tailoring the side surfaces of the glass surface to control the deformable diaphragm. The layer of sealing glass includes a first recess portion, and a second recess portion formed as part of the layer of sealing glass on the opposite side of the layer of sealing glass as the first recess portion. One of the plurality of piezoresistors is partially surrounded by the first recess portion, and another of the plurality of piezoresistors is partially surrounded by the second recess portion.

Abstract: A pressure sensor assembly, which includes a pressure sensing element having a diaphragm, a plurality of piezoresistors connected to the diaphragm, and at least one layer of sealing glass connected to the diaphragm. The pressure sensor assembly also includes a base, a layer of sealing glass is connected to the base, and is configured to maximize the sensitivity of the plurality of piezoresistors via tailoring the side surfaces of the glass surface to control the deformable diaphragm. The layer of sealing glass includes a first recess portion, and a second recess portion formed as part of the layer of sealing glass on the opposite side of the layer of sealing glass as the first recess portion. One of the plurality of piezoresistors is partially surrounded by the first recess portion, and another of the plurality of piezoresistors is partially surrounded by the second recess portion.

Abstract: One or more agricultural products, such as seed, fertilizer, herbicide and pesticide, may be dispensed at each of a plurality of row locations on an agricultural implement toolbar. A local bus connects each local metering device to a local controller at the row location, which may also have actual product application rate and soil characteristic sensors. The local controllers are connected through a system bus to a central processor mounted on the tractor, which is connected to a memory for storing product prescription and actual application maps, and also to a GPS receiver for determining current location in the field. Each local controller controls the agricultural product metering device(s) at the row location as a function of the last commanded rate received from the processor and the actual rate as sensed at the row location.