the fluid pressure in response to the movement of the mechanical element and a transducer coupled to the fluid containing device for producing an output signal in response to changes in the fluid pressure an energy storage device such as an accumulator may be coupled to the fluid containing device for receiving a limited amount of fluid in response to changes in the fluid pressure to damp pressure spikes in the output signal of the transducer application_number US 201514858089 A description an agricultural planter typically includes a number of individual row units each of which includes its own row cleaner device row opener device and row closing device the down pressure is typically controlled separately for each row unit or each of several groups of row units and is preferably controlled separately for one or more of the individual devices in each row unit as described in more detail in pending u s application ser no 14 146 822 filed jan 3 2014 which is incorporated by reference herein in its entirety fig1 6 illustrate an improved gauge wheel load sensor that takes the upward force from a pivoting planter gauge wheel support such as the pivoting support arms 10 in the row unit equipment shown in fig1 and 2.