H2flow ACUFLOW User manual

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IMPORTANT NOTE: For the most up-to-date version of this manual, please visit www.h2flow.net/product-literature
English
Rev.1.0
04/2021
Operating Manual
European version (English)
ACUFLOW™
FLOW METER

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2
Description...................................................................3
Concept ........................................................................3
Resources.....................................................................3
Service Repair Kit........................................................3
Models & Specifications ............................................4
Valve Body Feature....................................................4
Installation....................................................................5
Operation .....................................................................7
Head Loss Data...........................................................8
Dimensions ..................................................................9
Technical Data........................................................... 12
Maintenance.............................................................. 13
Warranty ............................................................back cover
TABLE OF CONTENTS

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Thank you for purchasing the AcuFlow flow meter by
H2flow Controls. If you would like to find additional
product resources, including tech tip sheets, brochures,
videos, and materials in other languages, please visit our
website at www.h2floweurope.com.
Service repair kits are available for all models:
AF-SK for all DN40 and DN50/65 models, comprising:
• 1 x o-ring
• 1 x spring
• 1 x flapper and indicator arm
• 1 x pivot pin
AF-SK-CAR for all DN80, DN100, DN150, and DN200
models, comprising:
• 1 x o-ring
• 1 x spring
• 1 x spring pulley pivot pin
• 1 x spring pulley to flapper pulley wire
For all other parts, please contact H2flow Europe at:
([phone].
RESOURCES SERVICE REPAIR KIT
DESCRIPTION
Above: AF-DN40, AF-DN50/65, AF-DN80, and AF-DN100
AcuFlow™ is a revolutionary, patented solution for accurate
and reliable flow and velocity rate measurement in fresh, gray
and potable water applications. A variation of this product,
named FlowVis®, is also available for swimming pool, spa,
fountain, water feature and flotation tank applications.
Using a design that is based on ‘mass flow’ principles,
AcuFlow™ provides many benefits that include:
• Ease of installation with zero to minimal straight pipe
• Installation flexibility that allows orientation in any position,
e.g., horizontal, vertical or even upside-down
• Long life without sticking floats or paddle wheels
• Combined Flow Meter and Check Valve for models
AF-DN40 and AF-DN50/65
• User upgradeable to include Digital functionality (model
AF-D)
As flow increases, the flapper moves forward toward
its fully open position. The flapper’s angular position is
directly related to the flow rate through the valve body /
tee / pipe. A calibrated scale on the valve’s lid provides a
highly accurate reading of the flow rate and velocity.
Calibrated Scale
Flow
CONCEPT

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4
On the side of the valve body that is used for the DN40, DN50, and DN65 models, you will note the following feature:
This feature has no functionality relating to the operation of the AcuFlow™ and is simply provided as an attribute to be able to
plumb in a drain down pipe and valve. A typical use for this might be a roof mounted solar system. Under no circumstances
should this hole be drilled out when using the valve body with the AcuFlow™.
VALVE BODY FEATURE
Model
Pipe Diameter (DN) Pipe
Schedule
GPM
Scale
Body Type
Independently verified
(NSF 50)
Flow Range
(m3/h)
40 50 65 80 100 150 200 40 80
Union
Valve
Te e
Saddle
clamp
AF-DN40 ● ● ● ● ● 2-20
AF-DN50/65 ● ● ● ● ● ● 2-25
AF-DN80 ● ● ● ● ● 16-55
AF-DN100 ● ● ● ● ● 28-102
AF-DN150 ● ● ● ● ● 89-227
AF-DN200 ● ● ● ● ● 113-410
AcuFlow™ comprises several models; it is important that you check that the model you are about to install is the correct one for your
application.
MODELS & SPECIFICATIONS

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Installation of AcuFlow™ should be in accordance with the following instructions.
Normal plumbing procedures such as cleaning, priming and gluing of fixtures should be followed in order to avoid leaks. If
you are not familiar with plumbing procedures, it is recommended that you employ the skills of a qualified plumber.
Unlike other flow meters, the majority of AcuFlow™ models are not aected by flow stream disturbances caused by its
proximity to pumps, elbows, tees, valves, etc. AcuFlow™ can be installed either horizontally or vertically. Straight pipe
requirements are addressed in the table on page 13.
Pay particular attention to the system’s direction of flow and make sure that the arrow on the lid of the AcuFlow™ is pointing in
the correct direction. For the AF-DN80, AF-DN100, AF-DN150 and AF-DN200 versions, the Tee / Saddle-clamp will feature an
additional arrow label. In the event that the AcuFlow™ is inadvertently installed into the plumbing in the wrong direction, simply
remove the (8) screws holding the lid in place and rotate the entire lid assembly by 180˚.
NOTE: For models DN40 and DN50/65, always remove the AcuFlow™ lid assembly prior to gluing in the valve body.
NOTE (1): When selecting a physical location to install AcuFlow™, be sure to allow accessibility to read the scale on the lid.
NOTE (2): Due to the possibility of excessive turbulence, models AF-DN80, AF-DN100, AF-DN150, and AF-DN200 should not be installed directly after the
pump.
NOTE (3): AcuFlow models are designed for the specific pipe Schedule stated at the bottom of the flow scale label. While it is important to comply with the
specific Schedule of pipe, the accuracy stated within this manual can be maintained if a short length (3-6 inches / 75-150mm), of the correct pipe type, is
installed either side of the AcuFlow. For example, an AF-DN100 can be installed to a SCH40 plumbing system, provided that a short length of SCH80 pipe is
installed into each end of the AcuFlow AF-DN100.
INSTALLATION
General Installation Guidance
Pipe Configuration Definitions:
A. Zero straight pipe before of after AcuFlow. Can be
installed in any orientation - horizontal, vertical up or
vertical down.
B. Straight horizontal pipe of ≥279mm before AcuFlow
C. Straight horizontal pipe of ≥432mm before AcuFlow
D. Straight horizontal pipe of ≥838mm before AcuFlow
E. Straight horizontal pipe of ≥1626mm before AcuFlow
Certified NSF 50 Accuracy and Associated Pipe Configurations
Model NSF 50 Level Pipe Configuration
AF-DN40 L1 A
AF-DN50/65 L1 A
AF-DN80 L1 B
AF-DN100 L1 C
AF-DN150 L1 D
AF-DN200 L1 E

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AcuFlow models AF-DN150 and AF-DN200, use Schedule 80 Saddle Clamps. Dimensional details are as follows:
Installation of Saddle-clamp style models (AF-DN150 and AF-DN200)
AcuFlow Model Saddle Size Hole to be Drilled in Pipe Angle for Hole / Saddle Clamp
AF-DN150 6” x 3” � 76.2 45º
AF-DN200 8” x 4” � 101.6 45º
When drilling the hole, the following precautions should be taken:
1. Prior to drilling, make sure that the intended hole will be at 45 degrees from
the perpendicular.
2. Ensure that the intended position will allow the user to read the AcuFlow
scale on the lid. If this is not possible, then we recommend adding an
AcuFlow Digital upgrade to enable the flow reading to be read remotely.
NOTE: Model AF-DN200 includes AcuFlow Digital as standard.
3. Do not damage the external pipe area around the drilled hole. Surface
damage will result in the Saddle’s o-ring being unable to provide a watertight
seal.
4. If using a hole saw, it is advisable to run the drill in reverse, and although this
will take longer to cut through the pipe, it will be less aggressive and will cut
a cleaner hole.
5. Be sure to obtain the correct sized hole saw.
Before securing the Saddle Clamp to the pipe, apply a good quality o-ring lubricant to the o-ring. Install the o-ring into the
socket on the underside of the upper-half of the Saddle Clamp. Position the Clamp to the pipe so that the o-ring is centered
around the drilled hole. Evenly tighten the nuts and bolts until both halves of the Saddle Clamp are mated together.
Piping configurations that are more demanding than those used by NSF for testing AcuFlow, e.g., installing an AF-DN80 right
next to another fitting such as an elbow, will result in a lower accuracy level than stated above. It is impossible to determine
the exact impact that each scenario will have, but like all flow meters installed in larger pipe sizes, turbulence becomes an
issue. The longer the run of straight pipe before the AcuFlow, the better.
Pipe Configurations other than those used by NSF for Testing
Level 1 (L1) - Average of absolute values of all single point deviations must be ≤2%. Single point deviations shall
not exceed ±4%.
Level 2 (L2) - Average of absolute values of all single point deviations must be ≤5%. Single point deviations shall
not exceed ±7.5%.
Level 3 (L3) - Average of absolute values of all single point deviations must be ≤10%. Single point deviations shall
not exceed ±12.5%.
Level 4 (L4) - Average of absolute values of all single point deviations must be ≤12.5%. Single point deviations
shall not exceed ±15%.
Level 5 (L5) - Average of absolute values of all single point deviations must be ≤15%. Single point deviations shall
not exceed ±20%.
NSF 50 Accuracy Levels
The NSF 50 Standard for flow meters, has five levels of accuracy (L1-L5) that are expressed as follows:

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When removing and re-installing the AcuFlow™ lid assembly, it is important to adhere to the following procedure:
1. Make sure that the o-ring on the underside of the lid is undamaged, lubricated with silicone (such as Boss 820) and is
in-place without twists.
2. Ensure flapper hinge pin is centered.
3. Carefully lower the lid onto its valve body, Tee, or Saddle-Clamp, making
sure that the o-ring stays in place.
4. Insert by hand the (8) stainless steel screws but do not tighten at this
stage.
5. Using a hand Phillips-head screwdriver, slowly tighten the screws in a
diagonal pattern, per the sequence to the right. Do not fully tighten one
screw before proceeding to the next, i.e., pull them down slowly multiple
times to avoid stressing and cracking the lid. Screws should be tightened
to a final torque of 25 inch / pounds or 2.8 Nm.
1
2
3
5
4
6
7
8
Tightening Lid Screws
AcuFlow is factory-calibrated to be extremely accurate across
its full operating range. Any perceived ‘inaccuracy’ is related
to the viewing angle at which the scale is being read. To avoid
so-called ‘parallax error’, it is important to position your eye so
that you are looking squarely at the tip of the indicator arm. To
achieve this, simply move your head so that you just lose sight
of the vertical leading edge of the red arm.
NOTE: Slowly move your head in this direction to the point
where the leading edge of the indicating arm is not visible.
Vertical leading edge
(1) (2)
(3)
(1) Indicator arm is
being viewed too far
forward / near the rear
of the lid.
(2) Indicator arm is
being viewed correctly.
(3) Indicator arm is
being viewed too far
back / front of the lid.
Reading the Flow Rate
OPERATION

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HEAD LOSS DATA
Head Loss (DN40):
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
5 7 9 11 13 15 17 19 21
Head Loss -Bar
Flow Rate m3/h
Head Loss (Bar) -DN40
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
5 7 9 11 13 15 17 19 21 23 25
Head Loss -Bar
Flow Rate m3/h
Head Loss (Bar) -DN50
Head Loss (DN50 / DN65):
Head Loss (DN80): Head Loss (DN100):

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DIMENSIONS
A
F
D
D
E
B
C
Refence Dimension
A 165.1 mm
B 149.23 mm
C Schedule 40 - DN40
D 34.93 mm
E 117.6 mm
F 92.25 mm
WEIGHT 0.544 kg
Models: AF-DN40
METRIC
A
F
D
D
E
B
C
Reference Dimension
A 165.1 mm
B 149.23 mm
CSchedule 40 - DN50 (Slip) /
DN65 (with coupling)
D 34.93 mm
E 117.6 mm
F 92.25 mm
WEIGHT 0.544 kg
Models: AF-DN50/65
METRIC

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A
D
F
Reference Dimension
A 203.2 mm
B 241.3 mm
CSchedule 80 -
DN80
D 47.63 mm
E 114.3 mm
F 107.96 mm
WEIGHT 1.36 kg
Models: AF-DN80
METRIC
C
B
E
A
D
F
C
Reference Dimension
A 241.3 mm
B 247.65 mm
CSchedule 80 -
DN100
D 57.15 mm
E 133.26 mm
F 127.0 mm
WEIGHT 2.27 kg
Models: AF-DN100
METRIC
B
E