after the instrument is reset or powered on the initial wait is typical h longer than the settled time the automatic reset time is not directly related to variable speed control instead it is simply a background timer which upon time out at step 104 initiates an automatic reset of the controller this causes the speed table to be rebuilt the automatic rest serves several purposes as described earlier referring now to fig7 a process flow for controlling an on off type pump is shown generally by numeral 170 in this case the micro controller 58 may send a signal to the digital to analog converter 67 one of two signals namely a value corresponding to a pump off signal or a value corresponding to a pump on signal alternatively a relay 67 u2032 may be provided which turns the pump 12 on or off the process is divided into four steps namely establish flow 172 regulate flow 174 timing out 176 and shut in 178 it is to be noted that each step is associated with a single control parameter which directs the process of that step a default setting is assigned to each control parameter however these parameters may be easily changed via the external computer 20 the parameters associated with these steps are establish flow period regulate flow cutoff point timing out period and shut in period generally these parameters are set at a default value of 15 minutes 25 1 minute and 30 minutes respectively the establish flow step 172 starts the pump and settles into an interval of time called the establish flow.