Flow Rate – displays the rate at which water is flowing through the flow meter in
gallons per minute (liters/minute). The flow rate displays a running average of the flow
per time. The flow rate may appear to not be very responsive as a result. An instant
reading can be obtained by pressing the ENTER button while viewing the flow rate.
This clears the running average and starts over.
Recov Rate – displays the instantaneous recovery rate of the well. This is the net
difference between the change in the level of the well and the water being pumped
from the well. This value is also filtered with a running average which can be reset by
pressing the ENTER button as above.
USING FLOW METER WITH OTHER EQUIPMENT
The flow meter can be used with data loggers which can count pulses and accept a
TTL level signal or a switch to ground signal. The data can be configured as a totalizer
tracking the total water pumped or as a frequency counter tracking the instantaneous
flow rate. The calibration constants are different.
As a flow totalizer, the scale factors convert each pulse to a volume of water in gallons
as follow:
1”
.0057
1.5”
.0121
2”
.0209
Keep in mind that the total water volume will only be accurate if the flow rate is greater
than the minimum flow rate for the flow meter used.
As a frequency counter, the scale factors convert pulses per second to gallons per
minute and include an offset
Size
K
Offset
1”
.322
0.20
1.5”
.650
0.75
2”
1.192
0.94
The offset increases the accuracy in the operating range of the flow meter but also will
yield a net flow when the flow rate is below the minimum or zero. Used to calculate
total water pumped, this technique is not appropriate.
Eno Scientific Well Sounder 2010 / 2010 PRO
Page 9
