Posted by Kevin Antony - May 11 2006

Ryan and I believe that the product rates here are very high and probably beyond the counting ability of the sensor. So when the pea seed runs out, the system rate is higher becuase it can actually count

the individual fertilizer particles.

In simpler terms, say 1 pea seed and 2 fertilizer particles flow by the sensor as a group and get counted as 1 particle. Remove the larger pea seed and the sensor can count both fertilizer particles.

Also, because he only has 4 sensors, any small change in the particle flow will result is big changes in displayed rate. How many runs? What speed is he running at? Does the customer have the number of openers calibrated right? What SRCF?

We can calculate the seed flow in each hose (in seeds/second) with a little more information to confirm this.

180 lb/ac of peas is a big load for the fan to push. There may also be some interesting dynamics in the air system when the seed runs out causing more product to flow in the 4 hoses with sensors installed (pretty hard to prove).