Eno Scientific 128-2025 User manual

FLOW METER
USER MANUAL
www.enoscientific.com
STATIC WATER LEVEL MEASUREMENT

Eno Scientific
1606 Faucette Mill Rd
Hills orough, NC 27278
USA
www.enoscientific.com
919-778-2660
Copyright Notice
Copyright © 2010 Eno Scientific, Hills orough, NC 27278, USA.
All rights reserved.
Part num er: 128-2025

FLOW METER
USER MANUAL
TABLE OF CONTENTS
PRODUCT OVERVIEW.................................................................................................. 4
FLOW SENSOR OPERATING RANGE..........................................................................5
FLOW SENSOR INSTALLATION: MECHANICAL.......................................................... 6
FLOW SENSOR INSTALLATION: ELECTRICAL........................................................... 7
USING FLOW METER WITH THE WELL SOUNDER....................................................8
USING FLOW METER WITH OTHER EQUIPMENT..................................................... 9
SPECIFICATIONS........................................................................................................ 10
WARRANTY AND SERVICE........................................................................................ 11

PRODUCT OVERVIEW
The Eno Scientific paddle wheel flow meters measure water flow y converting the
rotation of the internal paddle wheel into a num er of electrical pulses proportional to
the amount of water passing through. The flow meter is a modular unit resem ling a
pipe tee with PVC slip type pipe connections on the run and a socket on the ranch to
mount the sensor unit. The housings are made of PVC with sockets for schedule 40
PVC pipe connections in a variety of sizes. The sensor unit contains the paddle wheel
and electronics, and easily mounts to any of the housing sizes with a simple hand-
tightened ring nut. The PVC housings are designed to permanently install at the test
site to provide a socket for the flow sensor. The sensor can e connected while testing
is under way, then can then e removed and replaced with a cap for future testing.
The output from the sensor unit can e plugged into an Eno Scientific Well Sounder for
data collection and readout. It is designed to use very little power to conserve attery
life.
Additional housings, caps and other accessories are availa le from your local
distri utor or on our we site at www.enoscientific.com.
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FLOW SENSOR OPERATING RANGE
Eno Scientific flow sensors use a rotating impeller to sense the water moving through a
closed pipe. As the water moves, it drags the paddles with it, producing a digital pulse
as each paddle passes the sensor. Note that the pipe must e full for the impeller to
accurately reflect flow. The ta le elow shows the flow rate range for each sensor size.
The pressure drop through the sensor at maximum flow rates are included for
reference.
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Water flowing too slow or too fast will not e measured accurately. Eno Scientific flow
sensors measure flow over a range from 0.25 fps to 15 fps. It is important that the flow
size e selected ased on the flow rate to e measured and not the pipe size.The most
common mistake in selecting a flow sensor is to oversize the unit and not e a le to
measure low flow. The flow sensor will operate at significantly higher velocities than
commonly used for sizing pipe. Note: a 2” flow sensor has an operating range high
enough for use with 3 or 4 inch diameter pipelines running at lower velocities. If the
system flow rate falls elow the minimum shown in these ta les, use a smaller
diameter flow sensor installed in a “meter run”- a section of pipe containing 10
diameters of straight pipe ahead of the sensor and 5 diameters of straight pipe after the
sensor, as shown elow.
FLOW SENSOR INSTALLATION: MECHANICAL
Always install a flow sensor in a straight section of pipe where there is a minimum of 10
diameters upstream (ahead) and a minimum of 5 diameters downstream ( ehind) of
the flow sensor. Pipe ends, other fittings, valves, pipe enlargements or reductions or
anything else that would cause a flow distur ance should not e present in this length
of pipe.
The flow meter may e installed in any orientation, horizontal or vertical. It is important,
however, that the pipe e full of water without u les or de ris. With this in mind, in a
vertical pipe, upflow is prefera le to downflow. Orient the sensor so that it is easily
removea le for service or replacement with a cap.
If the flow sensor is installed elow grade, provide access to the sensor y installing a
valve ox or meter pit over it. In underground installations, sensor tees are usually
installed with the insert located in the 12:00 o’clock or straight up position to make
removal easier. Be sure to leave an adequate loop of wire to allow the sensor insert to
e removed for service while still remaining attached.
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The PVC pipe sockets are intended to e solvent welded to the PVC pipe using
standard solvent welding techniques. Threaded connectors or unions may e welded to
the tee for a remova le installation. Disassem le the flow sensor efore joining the tee
to the piping system. Remove the flow sensor from the housing y loosening the
retaining nut y turning it counter-clockwise then pulling the sensor housing straight
out. Caution: do not pull b the wires!
After installation of the tee, make sure the pipe is clean and free of any de ris. Then re-
install the sensor into the tee. Align the ridge on the sensor housing with the groove in
the sensor socket, then carefully slide the sensor all the way into the socket. Slide the
retaining nut over the sensor housing and hand tighten. Do not use a sealant or teflon
tape on the threads.
FLOW SENSOR INSTALLATION: ELECTRICAL
The flow sensor comes in two configurations:
1 – with a plugged ca le for simple attachment to other Eno Scientific devices such as
the Well Sounder. Installation is simple. Plug the ca le into the compati le connector
on the Well Sounder. Where the connector is occupied y another device such as the
pro e, a splitter is availa le to provide sockets for oth devices. An extension ca le is
availa le if the flowmeter is to e mounted more than 6 feet from the Well Sounder
connection point.
2 – with 3 separate wire leeds for connection to a well sounder or other devices. The
three leeds must e connected as follow:
Black - signal and power ground
Red - power 5 – 12 VDC
Brown - signal
Caution: improper connection ma damage or destro the sensor.
Attachment to a Well Sounder with this configuration requires a reakout adapter which
provides a plugged connection to the Well Sounder on one end and terminals on the
other end for the connection of the sensor leeds.
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If the sensor is to e mounted more than 4 feet from the connection point, the leeds
can e spliced and extended using wire as small as #28 AWG up to 300 feet. On runs
of more than 20 feet, it is recommended that shielded ca le e used and that the shield
e tied to a good earth ground. Otherwise lightning induced transients may damage the
sensor or other equipment.
USING FLOW METER WITH THE WELL SOUNDER
Once the flow meter is attached to the Well Sounder, ena le the flow meter y pressing
the SET utton several times until the Flow Meter ena le screen is displayed. Press
the UP utton until Ena led is displayed. The flow meter functions in the Well Sounder
are now turned on.
Press the SET utton once more to show the auto cali ration screen. To perform an
automatic cali ration, press the UP utton to start. Turn on the pump or open a valve to
pump 5 gallons into a ucket. As the ucket reaches the 5 gallon mark, press the
DOWN utton on the keypad. Cali ration is complete and has compensated for any
irregularities of the installation.
There may e situations where an auto-cali ration is not possi le. In this case, when
on the auto cali ration screen, press the ENTER utton to show the scale factor
screen. Use the UP or DOWN uttons to enter the scale factor for the installed flow
meter. When the correct scale factor shows on the display, the cali ration is complete
and the DISP utton may e pressed to resume operation mode on the Well Sounder.
Scale factors are as follow for the three housing sizes:
1” .0057
1.5” .0121
2” .0209
Once the display mode is active, press the DOWN utton to the new flow meter
information screens, Flow, Flow rate and Recov rate.
Flow - displays the total water through the flow meter in gallons or liters if in metric
mode. The total can e reset y pressing the ENTER utton while viewing on the
display.
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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 e very responsive as a result. An instant
reading can e o tained y pressing the ENTER utton 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 etween the change in the level of the well and the water eing pumped
from the well. This value is also filtered with a running average which can e reset y
pressing the ENTER utton as a ove.
USING FLOW METER WITH OTHER EQUIPMENT
The flow meter can e used with data loggers which can count pulses and accept a
TTL level signal or a switch to ground signal. The data can e configured as a totalizer
tracking the total water pumped or as a frequency counter tracking the instantaneous
flow rate. The cali ration 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 e 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 ut also will
yield a net flow when the flow rate is elow the minimum or zero. Used to calculate
total water pumped, this technique is not appropriate.
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SPECIFICATIONS
Materials:
Housings – Type 1 PVC
Rotor – HDPE
O-ring – Buna N
Axle – Tungsten Car ide
Plumbing:
Pipe size – Schedule 40 PVC
Pressure - 240PSI
Ph sical:
Pipe size – Schedule 40 PVC
Test Pressure – 240 PSI
Temperature: 32 – 140 F (0 – 60 C)
Dimensions:
1” 5.75 x 4.5 x 2.4”
1.5” 6.25 x 5.25 x 2.4”
2” 7.11 x 5.75 x 3”
Clearance for sensor removal: 3.5”
Electrical:
Power: 5 – 24V @ 500 uA max
Output signal: Pull-to-ground (+V – 0V)
Pulse width: ~5mS
Frequency: .3 – 200 Hz
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WARRANTY AND SERVICE
Eno Scientific warrants to the user that all products manufactured y Eno Scientific, will
e free from defects in workmanship and materials for 1 year from the date of
shipment.
Eno Scientific warrants to repair or replace any such defective equipment or part
(determined to our satisfaction to have a defect in workmanship or original material)
upon receipt and inspection of such defective equipment to Eno Scientific with all
shipping pre paid y the user.
In no event shall Eno Scientific e lia le for any direct, indirect or consequential
damages, a use, acts of third parties (rental equipment), environmental conditions or
other expenses which may arise in connection with such defective equipment. This
warranty shall not apply to damage of equipment caused y incorrect installation,
usage, lightning, storage, alteration or inadequate care.
This warranty does not apply to parts, assem lies or devices not manufactured y Eno
Scientific which are covered y other manufacturers’ warranties. There are no
warranties except as specifically provided in writing herein.
Contact Eno Scientific with any warranty or service questions.
For additional information, please visit our we site at www.enoscientific.com.
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