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

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Reference Dimension
ASchedule 80 - 168.86 mm
(DN150)
B 152.65 mm
C 318.45 mm
D 107.51 mm
E 191.32 mm
WEIGHT 2.27 kg
Models: AF-DN150
METRIC
A
B
E
D
C
Reference Dimension
A Schedule 80 - 220 mm (DN200)
B 216 mm
C 368 mm
D 133.11 mm
E 245 mm
WEIGHT 4.08 kg
Models: AF-DN200
METRIC
A
B
E
D
C

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12
Component
AF-DN40 AF-DN50/65 AF-DN80 AF-DN100 AF-DN150 AF-DN200
Material
Lid ●●●●●●Clear Polycarbonate
Spring ●●●●●●Hasteloy c-276
o-ring ●●●●●●Viton
Lid Screws ●●●●●●316 Stainless Steel
Indicator Pivot Pin ●●●●●●Hasteloy c-276
Scale Label ●●●●●●Armalex
Product Label ●●●●●●Armalex
NSF Label ●●●●●●Armalex
Valve Body ● ● CPVC
Union Valve Body CPVC
Check Valve Flapper ● ● PPEPS
Flapper Seal ● ● Viton
Non Check Valve Flapper ABS
Indicator (AF-DN40 and AF-DN50/65) ● ● ABS
Indicator (AF-DN80 to AF-DN200) ●●●●ABS
Magnet ●●●●●●N52 Neodymium
Carriage ●●●●ABS
Flapper Pulley ●●●●ABS
Spring Pulley ●●●●ABS
Flapper to Indicator Link ●●●●ABS
Connecting Wire ●●●●316 Stainless Steel
Dowel Pin - Link to Indicator ●●●●316 Stainless Steel
Dowel Pin - Flapper to Carriage ●●●●316 Stainless Steel
Barrel Bolt - Link to Flapper Binding ●●●●316 Stainless Steel
Tee, Schedule 80, DN80 ●CPVC
Tee, Schedule 80, DN100 ●CPVC
Reducing Bushing 3" ● ● PVC
Reducing Bushing 4" ● ● PVC
Saddle Clamp 6" x 3" ●CPVC
Saddle Clamp 8" x 4" ●CPVC
Saddle Clamp Nut & Bolt Set ● ● 316 Stainless Steel
TECHNICAL DATA
Material Data Sheet (MSDS)

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Although AcuFlow™ is designed to be maintenance-free, periodic checks should be made to the following:
Condition Check for Remedy
Leak around lid seal O-Ring Failure Replace O-Ring
Leak from lid Cracks in lid Order new lid from supplier
Higher flow reading than normal Broken or weak spring Replace spring
Lower flow reading than normal Indicator arm stuck due to debris Remove lid and clear debris
Flow indicator stuck at one position Debris between indicator arm and lid Remove lid and clear debris
Indicator always at max flow when pump
running Broken spring Replace spring
MAINTENANCE
Operational Data
Model Accuracy Pressure
Rating
Calibration
Required?
Min/Max Operating
Ambient Temp Design Life
AF-DN40 Average: 98.7%
8.62 bar No 32˚F (0˚C) / 140˚F (60˚C) Greater than 5 years
AF-DN50/65 Average: 99.2%
AF-DN80 Average: 98.9%
AF-DN100 Average: 99.6%
AF-DN150 Average: 98.1%
AF-DN200 Average: 98.9%
Straight Pipe Requirements
Model Straight Pipe Before (x Pipe Diameters) Straight Pipe After (x Pipe Diameters)
AF-DN40, AF-DN50/65 0mm (x0) 0” (x0)
AF-DN80 381mm (x5) 0” (x0)
AF-DN100 508mm (x5) 0” (x0)
AF-DN150 914mm (x6) 0” (x0)
AF-DN200 1625mm (x8) 0” (x0)

H2flow Controls, Europe
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Release 1.0 04/2021 Europe-English
IMPORTANT, please read and keep this document on record.
1. Definition
H2flow Controls, Inc., warrants the AcuFlow™ product for 3-years from its date of supply from H2flow Controls, Inc. or its stocking Distributor. In
the event that the product experiences a premature failure due to defective workmanship or materials, H2flow will, at its discretion, replace either
the failed component(s) or the complete AcuFlow unit. H2flow shall not be responsible for third-party labor or any consequential losses. Damage
caused by improper installation, misuse or exposure to excessive chemicals such as acids or chlorine, will not be covered by this warranty.
2. Eligibility
This warranty extends to the original purchaser only or to the end-user client of an H2flow Controls Inc authorized affiliate.
3. How to obtain service
To obtain service under the terms of this warranty, the customer is required to notify H2flow Controls Inc. before the expiration of the warranty
period and to return the item in accordance with H2flow Controls Inc’s product return policy. Any product returned for warranty repair must be
accompanied by a full fault report specifying the symptoms and the conditions under which the fault occurs. Should H2flow Controls Inc incur
additional cost as a result of a failure to complete the appropriate paperwork, an administrative charge may be levied.
4. Exclusions
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate care. H2flow Controls Inc. shall
not be obligated to provide service under this warranty if:
a) damage has been caused by a failure to make a full and proper inspection of the product (as described by the documentation enclosed with the
product at the time of shipment) on initial receipt of the product following shipment;
b) damage has been caused by the attempts of individuals, other than H2flow Controls Inc sta to repair or service the product;
c) damage has been caused by the improper use of the product, including but not limited to, the installation of a AcuFlow unit using a chlorination
system as described in this manual.
5. Charges
Under cover of this warranty, H2flow Controls Inc will pay the carriage and insurance charges for the shipment of defective product back to H2flow
Controls Inc and for its return to the client’s original site of dispatch except when:
a) H2flow Controls Inc’s product return policy has not been followed.
b) product failure is caused by any of the exclusions described at paragraph 4 above, when the customer will be liable for the full cost of the repair
(parts and labor) plus all carriage and insurance costs to and from H2flow Controls Inc’s premises.
c) the product is damaged in transit and a contributory cause is inadequate packaging. It is the customer’s responsibility to ensure that the
packaging used to return equipment to H2flow Controls Inc is the same, or has equivalent protective qualities, to that used to ship the product to
the customer in the first instance. Any damage resulting from the use of inadequate packaging will nullify H2flow Controls Inc’s obligations under
this warranty.
Should the customer’s product be damaged in transit following a repair at H2flow Controls Inc’s site, a full photographic record of the damage must
be obtained (packaging and the product) to support any claim for recompense. Failure to present this evidence may limit H2flow Controls Inc’s
obligations under this warranty.
THIS WARRANTY IS GIVEN BY H2FLOW CONTROLS INC IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY, NON INFRINGEMENT OR FITNESS FOR
A PARTICULAR PURPOSE. H2FLOW CONTROLS INC SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES OR LOSSES. WE SPECIFICALLY DISCLAIM ANY AND ALL WARRANTIES TO CUSTOMERS OF THE
CUSTOMER. THE CUSTOMER’S SOLE REMEDY FOR ANY BREACH OF WARRANTY IS THE REPAIR OR REPLACEMENT, AT H2FLOW
CONTROLS INC’S DISCRETION, OF THE FAILED PRODUCT.
WARRANTY