H2flow ACUFLOW User manual

IMPORTANT NOTE: For the most up-to-date version of this manual, please visit www.h2flow.net/product-literature
English
Rev.1.0
01/2021
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Operating Manual
North American version (English)
ACUFLOW™ digital
FLOW METER
digital

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table of contents
Description .............................................................................................................3
Compatibility .........................................................................................................3
Safety Information ..............................................................................................3
What’s included.................................................................................................... 4
Dimensions.............................................................................................................5
Pre-Installation.......................................................................................................5
Installation ..............................................................................................................6
Wiring........................................................................................................................9
Output.......................................................................................................................10
Programming.........................................................................................................11
Operation ................................................................................................................12
Advanced Setup ..................................................................................................12
Auxiliary Relay ...................................................................................................... 15
Display Features..................................................................................................16
Troubleshooting...................................................................................................17
Environmental....................................................................................................... 19
Standards & Approvals..................................................................................... 19
NSF 50 Accuracy Certification......................................................................20
Specifications........................................................................................................21
Warranty .................................................................................................................. 22
Notes.........................................................................................................................back cover
2
SECTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

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1. description
Even with the ability to install AcuFlow in tight spaces and with almost zero straight pipe requirements, it can sometimes
be dicult to install the device in a location that makes it easy to read. AcuFlow Digital solves this problem by allowing you
to install a Digital readout in a user-accessible location. With the digital upgrade, users will also experience even greater
functionality, ease of use, and precision. Unique features such flow rate alarms and the ability to interface with external
equipment further enhance the industry’s most respected flow meter.
AcuFlow Digital employs a patented electronic design to accurately measure and display the flow rate in both a numeric
value as well as in a bar-graph format. The remote digital display is available as a stand-alone PLC for mounting in an existing
cabinet door, or as a PLC housed in an optional NEMA 4X corrosion proof enclosure.
In addition to greater installation flexibility, the Digital upgrade will also eliminate the possibility of experiencing a parallax
error issue when reading the standard AcuFlow.
Note: Parallax error can be caused by not looking at the AcuFlow scale squarely – akin to a passenger in a car looking at
the speedometer and seeing a dierent reading to the driver. Additional details relating to this, can be found in the AcuFlow
Operating Manual.
Using the ‘Advanced Setup’ features, AcuFlow Digital can be interfaced with other systems such as heaters, chemical feeders
and UV units, so that they will only operate above a user-defined flow rate. When using this option, it will be necessary to
include the Auxiliary Interface Unit with your purchase.
AcuFlow Digital also includes a 4-20 mA output that can be interfaced to Variable Frequency Drives, such as the Emotron
FDU or VS10/30 (available from H2flow Controls) in order to achieve constant flow control.
2. compatibility
AcuFlow Digital is designed to be included (as an option) with any new AcuFlow installation. Alternatively, it can be retrofitted
to an existing AcuFlow – regardless of the size or model. For retrofit installations however, it is important to take careful note
of sections 6.1 and 6.2 of this manual.
3
a) Electrical: AcuFlow Digital utilizes a 100-240VAC to 12VDC power supply that needs to be plugged into a
standard receptacle. The power supply cord should be firmly inserted into the receptacle, and a plug restraining clamp
should be added, if any of the AcuFlow Digital’s outputs are being interfaced to other equipment such as VFD’s, Heaters,
Chemical Feeders or any safety related equipment.
b) Mechanical: The AcuFlow Digital sensor housing should only be secured to the AcuFlow lid using the two extra long 1”
(25mm) stainless steel Phillips head screws provided.
3. safety information
ALL CONNECTIONS MUST BE MADE BY A QUALIFIED ELECTRICIAN. ELECTRIC SHOCK CAN CAUSE
SERIOUS INJURY OR EVEN DEATH.
IMPORTANT INSTALLATION NOTE Installers should read the section ‘Advanced Setup’ prior to
installation. This section details the need for a Windows-PC with internet connection to complete an advanced setup.

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4. what’s included
AcuFlow Digital model AF-D / AF-D-PM includes:
Fig 1.2 Sensor with standard
cable
Fig 1.3 x2 extended length
lid screws
Fig 1.4 For 1.5”(DN40),
2”(DN50), 2.5”(DN65)
AcuFlow models: New flapper
with attached indicator arm
and magnet
Fig 1.8 Optional,
AcuFlow unit. Required
for use with all ‘new’
Digital installations. Sold
separately
Fig 1.0 100-240VAC to
12VDC Power Supply (with
interchangable international
adapters for export markets)
Fig 1.1 NEMA 4X enclosure
with pre-mounted Display
(AF-D) or standalone LCD
for existing cabinet mount
(AF-D-PM)
Optional equipment and accessories not included as standard with AF-D / AF-D-PM:
Fig 1.6 Optional, 8M
(26.25ft.) extension cable
Fig 1.7 Optional Auxiliary
Interface Unit
Fig 1.6
Optional, 8M
Fig 1.7
Optional Auxiliary
Fig 1.5 Type A to Type B
cable

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5. dimensions
For product dimensions, please refer to the images below (Figs. 1.9 & 2.0). *Cable glands supplied with model AF-D; not
pictured below. Images shown are of same sized FlowVis Digital.
5.970” / 151.638mm
6.135” /
155.829mm
3.588” /
91.1352mm
 0.510” /
12.954mm*  0.610” /
15.494mm*
Fig 1.9 Fig 2.0
6. pre-installation
This section only applies to AcuFlow models that are 2.5” and below OR, AF-3 and AF-4 that were provided prior to
November 2020. This section covers two scenarios for installing the AcuFlow Digital system:
a) Install AcuFlow Digital to a new OR existing AcuFlow unit for 1.5”/DN40, 2”/DN50, or 2.5”/DN65 pipe. If this section applies
to you, please refer to Installation section 6.1 before proceeding to Installation section 6.3.
b) Install AcuFlow Digital to a 3”/DN80 or 4”/DN100 AcuFlow that was manufactured before January 2021. If this section
applies to you, please refer to Installation section 6.2 before proceeding to Installation section 6.3. If your AcuFlow
3”/DN80 or 4”/DN100 was manufactured after January 2021, please proceed directly to Installation section 6.3.
Note: To confirm the manufacturing date of your AF-3 (DN80) or AF-4 (DN100), look at the 2-digit code on the side of the
AcuFlow lid and confirm that it is equal to or greater (later) than HT18. For example HT18 is greater (later) than HT17. If the code
on your AcuFlow lid is less than (before) HT18, a new, compatible lid assembly will be required. Please contact H2flow for
assistance in determining the appropriate lid assembly for your installation.
2.93” / 74.77mm
Fig 2.1
2.93” /
74.77mm
2.23” /
56.62mm

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7. installation
6.1. Replacing the flapper & indicator assembly in 1.5” (DN40), 2” (DN50) and 2.5” (DN65) installations
For the AcuFlow Digital (AF-D) to function on AcuFlow models AF-15, AF-C-M-DN40, AF-2, AF-C-M-DN50, AF-25, and
AF-C-M-DN65, it will be necessary to replace the Flapper and its attached red indicator with the one provided in the AF-D
packing box (see Fig.1.4 on page 4) - regardless of whether the AcuFlow unit itself is new or already installed. This is a simple
procedure that will take less than 2 minutes; however, it is important to reassemble the unit exactly as shown below.
Spring legs location tabs
Procedure:
1. Release each of the two spring legs from the location tabs - this will
remove the tension from the spring. See Fig.2.1 above.
2. Slide the Hasteloy pivot pin to completely remove it from the lid.
3. Discard the existing gray Flapper with its attached red indicator.
4. Pay attention to the orientation of the spring when reassembling the unit.
5. Install the new Flapper and Indicator following a reversal of the
disassembly procedure. Note, you may find it easier to place the spring’s
legs over their location tabs before sliding the pin.
6. Proceed to Section 6.3 to complete the installation of AcuFlow Digital.
Fig 2.2
Fig 2.3

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installation cont.
6.2. Installing AcuFlow Digital to an existing (pre- January 2021) 3”(DN80) or 4” (DN100) AcuFlow
1. Remove the screws from the existing lid of the AcuFlow unit and remove the lid assembly.
2. It is not uncommon for the AcuFlow lid to be retained by a vacuum
suction after the 8 screws have been removed. Under no circumstances
should you try to leverage the lid o with a screwdriver or similar
device. Instead, momentarily open a valve that is either upstream or
downstream to release the vacuum.
3. Ensure that the new lid assembly has a code on the side of the lid that
is equal to or greater than HT16. For example HT16 is greater (later) than
HT15.
4. Ensure that the o-ring on the underside of the new lid assembly is
undamaged, lubricated with silicone (such as Boss 820), and is in-place
without twists.
5. Carefully lower the lid onto the Tee, making sure that the o-ring stays in
place. Also make sure that its orientation is correct; the top of the AcuFlow
scale should be toward the direction of flow.
6. Referring to Fig.2.4 (right), identify the required side of the AcuFlow to mount
the AcuFlow sensor to, ensuring that the sensor is fully seated and the screw
holes line-up with those on the AcuFlow lid assembly.
7. Place 6 of the 8 AcuFlow screws in the lid assembly, and use the 2 longer
screws provided with your AcuFlow Digital (Fig.1.3 on page 4) in the holes
for the sensor. Do not tighten.
8. Using a hand Phillips-head screwdriver, slowly tighten the screws in a
diagonal pattern, per the diagonal sequence shown in Fig.2.5. 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 in./lbs. or 2.8 Nm. Disclaimer: Under no
circumstances should the screws in the AcuFlow lid assembly or sensor be
tightened with an electric screwdriver in the ‘drill’ setting. This can result in
a cracked lid or sensor and will void the product warranty.
9. Proceed to section 6.3 to complete the installation of your AcuFlow Digital.
Fig 2.4
1
2
3
5
4
6
7
8
Fig 2.5

8
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6.4. Sensor/blue light is flashing
A blue LED is visible when looking at the sensor. A flashing blue LED indicates that the AcuFlow does not have a magnet
installed. All AcuFlow models that are 3” (DN80) and larger that were manufactured after January 2021 had this magnet
installed. If your application involves a unit that is ≥ 3” (DN80), and the sensor light is flashing, it is apparent that your AcuFlow
unit was manufactured before this date. Please contact H2flow to find a solution. If your AcuFlow model is for a 2.5” (DN65) or
smaller, and the blue sensor light is flashing, please install the replacement flapper/indicator that was included in the AcuFlow
Digital shipping box (see section 6.1 of this document).
installation cont.
6.3 Installing AcuFlow Digital to a new or existing (post- January 2021) AcuFlow
PLEASE NOTE: If you are installing AcuFlow Digital to either, a) an existing AF-15(DN40), AF-2(DN50), or AF-25(DN65), please
refer to section 6.1, or b) an AF-3(DN80 or AF-4(DN-100) that was manufactured before January 2021, please refer to section
6.2 of this manual before proceeding with section 6.3.
1. Check the contents of your AcuFlow Digital box to ensure that they comply with the components shown on page 4
of this document
2. Unless previously done in section 6.2, remove the two AcuFlow lid screws that will align with the hole mounting tabs
for the sensor (refer to Fig.2.4 on pg. 7).
3. Mount the sensor, ensuring that it is fully seated and the screw holes line-up with those on the AcuFlow lid assembly (see
Fig.2.4).
4. Place the 2 extended screws provided with your AcuFlow Digital (Fig.1.3 on page 4) in the holes for the sensor and
using a hand Phillips-head screwdriver, slowly tighten the screws. Do not fully tighten either screw before proceeding
to the next, i.e., pull them down slowly, multiple times to avoid stressing and cracking the sensor. Screws should be
tighteneed to a final torque of 25 in./lbs. or 2.8 Nm. Disclaimer: Under no circumstances should the screws in the
AcuFlow lid assembly or sensor be tightened with an electric screwdriver in the ‘drill’ setting. This can result in a
cracked lid or sensor, and will invalidate the product warranty.
5. Mount the AcuFlow Digital display in a location that is: a) convenient for viewing, b) close enough to the AcuFlow flow
meter for the sensor cable length (including any extension cables you may have purchased), and c) close enough to a
100-240VAC receptacle to allow the power supply to connect. Note: The power supply output (12VDC) cable has a total
length of 10 feet / 3M, but can be extended up to a total length of 24 feet / 8M. It is essential that its polarity is maintained.
Good electrical practices should be used when extending this cable.
6. Connect the Power Supply low voltage (12VDC) output to the Display (see wiring diagrams on pages 9 & 10).
7. Connect the Sensor to the display using either the standard-length cables provided or the extension cable (if
purchased).
8. Disclaimer: The sensor-to-display cables MUST NOT be cut or spliced in any way. Doing so will invalidate the
AcuFlow Digital product warranty. If these cables are longer than needed, we suggest coiling the excess cable
and tying with a zip-tie.
9. Plug in the Power Supply and ensure that the Digital display illuminates and the blue light on the sensor is on (not
flashing). If the blue light is flashing, please refer to section 6.4.
10. If being used, connect 4-20 mA output to external equipment such as a VFD (see Fig.2.8).
11. If being used, connect the alarm relay (see Fig.3.0).
12. Proceed to the Programming section.

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8. wiring
Power Supply Wiring
Fig 2.6
Fig 2.7
Sensor Wiring

Auxiliary Relay
Wiring
COIL
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9. output
4-20 mA Wiring
Fig 2.8
Auxiliary Relay External
Equipment Connection
Fig 2.9
10
Fig 3.0

10. programming
To proceed with programming, first locate the DIP switches on the back side
of the Digital display. Refer to the circled area in Fig.3.1.
Important Note: It is important to select the correct DIP switch position
based on BOTH the model (first column) and the pipe size (second column)
shown in the table below as multiple AcuFlow models exist for the same pipe
diameter.
AcuFlow Model Pipe Size DIP Switch Position
1 2 3 4
AF-2; AF-M-DN50 2” and DN50 ON OFF OFF OFF
AF-C-S 2” ON ON OFF OFF
AF-25; AF-M-DN65 2.5” and DN65 ON ON ON OFF
AF-3; AF-M-DN80 3” and DN80 OFF OFF ON OFF
AF-4; AF-M-DN100 4” and DN100 OFF OFF OFF ON
AF-6; AF-M-DN150 6” and DN150 OFF ON OFF ON
AF-8; AF-M-DN200 8” and DN200 OFF ON ON OFF
AF-15; AF-M-DN40 1.5” and DN40 OFF ON ON ON
AF-15-U 1.5” ON ON OFF ON
AF-2-U 2” OFF OFF ON ON
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Fig 3.2 (left) The
default setting for
the DIP switches (all
switches set to the
OFF position).
Fig 3.3 (left) DIP
switch number 1 set
to the ON position.
Fig 3.1

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11. operation
After setting the DIP Switches to reflect the AcuFlow model and Pipe Size employed in your application, the AcuFlow Digital
is ready to use. No calibration or further settings are required. However, by default, the AcuFlow Digital readout will display
the flow rate in US GPM and the Turnover Rate will show --- (indicating that this function is not activated). If you would like to
change the unit of measurement from US GPM to either LPM or M/hr, and / or activate the Turnover Rate function, then it will
be necessary to access these functions as described in the Advanced Setup section.
12. advanced setup
Although AcuFlow Digital will function as a flow meter without additional steps, there are several very useful features that can
be accessed via the ‘advanced setup’ procedures. These features comprise:
• Display of a turnover rate
• Changing the display’s appearance at a user-defined flow rate
• Programming an (optional) auxiliary relay to operate external equipment such as a Heater or Chemical Feed System,
which will only operate at user defined flow rates
Programming the advanced features will require a Windows-based laptop PC. The initial step is to download the Advanced
Panel Display Software from the internet, we recommend that this be done in an oce environment rather than at the
installation location. Note: there is no requirement to connect the laptop to the Display during this initial step.
The laptop PC will require the following:
• Running either a Windows 7, 8, or 10 operating system, using either a 32 or 64-bit configuration
• Microsoft .NET Framework (if you don’t have this, it can be downloaded from www.microsoft.com/net)
• A spare USB 2.0 port (for later connection to the Display)
• An internet connection

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advanced setup cont.
Step 2 - Programming the advanced features of the AcuFlow Digital Display
With the Configurator program still open, connect the Display to your PC using the Type A to Type B cable that was delivered
with your AcuFlow Digital (Fig 1.5).
The AcuFlow Digital screen should display the text ‘US.b’, and the Configurator should now look like Fig.3.5, below. Click on
the ‘Configure APM’ button.
Fig 3.5
Step 1 - Download and install the ‘Advanced Panel Display’ Configurator Software:
Launch an internet browser page and go to www.h2flow.net/acuflow-flow-meter and locate the ‘Configurator Download’
section.
Click on the ‘Configurator Download’ button. When the Configurator has
finished downloading, open the file, either from your Downloads folder, or
from the bar at the bottom of your browser. Follow the prompts provided by
the Setup Wizard and when asked, click on ‘Save As’. Save the file to your
preferred location. The default file name will be ‘APM Configurator’.
After downloading the file, double-click on the icon labelled ‘APM Configurator’.
You should then see an image on your desktop which resembles Fig 3.4 (right).
Click on the ‘Updates’ tab and make sure that the ‘Automatic Updates’ option is
checked. If ‘Automatic Updates’ was un-checked, please check this, and then
close the program and re-launch. If new updates are available, they will be
automatically downloaded and saved to your PC.
The Configurator program has now been successfully installed and your laptop
is ready to connect to the AcuFlow Display.
Fig 3.4

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advanced setup cont.
You can change this value to that desired for your application, and you can also determine the condition that you wish it to
operate, e.g., above or below the programmed value, between or outside the programmed values. Note that when either of
these latter two options are selected, a second value window will appear.
Beneath this you will see an option to select the relay’s sensitivity in detecting the programmed condition at which you wish
it to activate; the default is set to ‘low’. It is recommended that you do not adjust this unless you need the relay to operate
immediately when the flow rate hits the programmed level. Please note, however, that the equipment connected to the relay
may experience rapid turning on and o when the flow rate is turbulent and is close to the programmed alarm value.
Finally, you may also wish to change the appearance of the Display when the Alarm condition is met. For example, if you
wanted to make the screen flash red when the flow rate is above a certain value such as a high flow rate, you can achieve
this by checking the ‘Change Backlight’ box and selecting the desired appearance.
When all changes have been made, it is essential that you click on ‘APM’ in the menu at the top of the screen, and then
click on the dropdown option ‘Write Configuration to APM’.
Before disconnecting the Type A to Type B cable between your PC and the Display, you may wish to save your configuration
settings. To do so, click on ‘File’ at the top-left of the Configurator screen, and then click on ‘Save Configuration File’ from the
dropdown menu. In the ‘Save As’ dialog box, navigate to the location that you wish to save the file, and give it a Filename
before clicking on the ‘Save’ button.
Fig 3.6
You should now see a screen that looks like the one below (Fig. 3.6):
In this screen, you can program:
• The unit of measurement in either
US GPM (default), LPM, or M3/h
• If being installed to a swimming pool
or tank application, then the turnover
rate by inserting the volume
Please do not change any other values.
‘Alarm 2’ has been designated to the
Digital (Open Collector) output that can
be connected to control the optional
Auxiliary Relay kit discussed in section
13 of this manual. In the right-hand side
of this screen, you can program the
condition that you wish the relay to
activate. As can be seen from the default
values, it will operate when the flow rate
is above 25 GPM.

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13. auxiliary relay (optional kit)
The Auxiliary Relay option is a valuable feature that allows the AcuFlow Digital user to control external devices such as Heater
and Chemical Feeders at user-defined flow rates. For example, you may want to control the Chemical Feeder to operate only
above 20 GPM. Setting this value is discussed in Section 12.
The Auxiliary Relay option kit installs into the rear of the AcuFlow Digital Display enclosure and comprises the following items:
Qty. Item
1 Auxiliary Relay with 12 VDC coil and 2 sets of souble pole / double throw dry contacts
1 Set of relay coil wires
1 Cable zip ties (2) with (1) adhesive pad
6 Crimp style Cable Spades
1 Cable Gland
Installation (internal)
1. Secure Relay by removing adhesive backing tape
2. Attach pre-made blue wire to terminal 1 on Relay
3. Attach pre-made red wire to terminal 0 on Relay
4. After removing protective film, attach Cable Pad to rear of hinged door in location shown
5. Use Zip Ties as shown
6. Connect blue wire to terminal marked ‘SP2’ on rear of Display
7. Connect red wire to terminal marked ‘PSU+’ on rear of Display
8. Drill hole 5/8” (16mm) diameter hole for Cable Gland Be careful not to damage Relay
1
2 3
4 5
6
7
81
1
2
3
4
5
6
7
8

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auxiliary relay (optional kit) cont.
Installation (external)
The Auxiliary Relay comprises two sets of double pole / double throw dry contacts. Both sets of contacts will operate at
the same programmed flow rate as set in the ‘Advanced Setup’ section on page 14. Each of the two sets of contacts has
a normally open and a normally closed relay. The ‘normal state’ is the condition that the contacts are in before they are
activated when the coil is energized by the programming value. Please refer to the Auxiliary Relay Connection Diagram (Fig.
2.9) on page 10.
Using the cable spade connectors provided, connect the external wiring to the required Auxiliary Relay outputs. For example,
if the Heater requires a contact closure to operate, connect the heater enabled circuit to either terminals 4 and 2, or 8 and
6. Both of these are normally open contacts that will close when the relay coil is energized by the setting applied in the
‘Advanced Setup’ section on page 14.
14. display features
The AcuFlow Digital Display comprises certain standard features as well as user-defined parameters / adjustments. Standard
features include a Digital and Bar Graph reading of the measured flow rate. The user has the option to program the Unit
of Measurement to be displayed in either US GPM (default), LPM or M3/hour. The patent pending feature that displays the
Turnover Rate is activated by the user during programming. The Display’s format can also be programmed by the user to
change its appearance under prescribed conditions, e.g., flash above or below a certain flow rate. Refer to the ‘Advanced
Setup’ section for more information on how to take advantage of this functionality.
Graphical display
of flow rate
Unit of measurement
options: US GPM,
LPM, m/h
Digital readout of
flow rate
Pool turnover rate
in hours
H2flow Controls
internal reference
only

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14. display features cont.
15. troubleshooting
AcuFlow Digital has been designed to be an easy to install, accurate and reliable addition to the renowned AcuFlow flow
meter. However, should an unexpected problem occur, please refer to the following Troubleshooting Guide.
As always, please feel free to contact us with any questions or concerns. Tel: [phone]
Observation Solution
Digital Display not
illuminated
• Check Power Supply is plugged into its receptacle, if yes...
• Check for 12 VDC power at terminals PSU+ and PSU- on rear of Display, if no voltage...
• Check to see if wires from the Power Supply are securely terminated into the PSU+ and
PSU- terminals, if yes...
• Check to see if power source is active. If yes, Power Supply needs to be replaced
Digital Display reads
zero flow rate with pump
running
• Is Display illuminated? If yes...
• Check to see if AcuFlow is reading the expected flow. If yes...
• Check to see if there is a steady blue light on the sensor. If no...
• Check sensor wiring and terminations into the rear of the Display - red wire to I input +,
black wire to I input -, and green wire to COM. Is everything is secure and correct? If yes...
continued on next page
On all AcuFlow Digital installations for 8-inch AcuFlow units, please note that the text ‘X10’ will appear above the flow reading
at all times. See the below examples (Figs. 3.7 & 3.8) and instructions on how to properly read these flow rates:
Note the ‘X10’
indicator
Note the
decimal point
92.4 x 10 = 924 GPM 103 x 10 = 1030 GPM
Fig 3.7 Fig 3.8

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troubleshooting cont.
Observation Solution
Digital Display not
illuminated (continued
from previous page)
• If the blue light is flashing, the sensor has not detected a magnet in the AcuFlow indicator
arm. Contact H2flow for further assistance.
• Is this a retrofit to an existing AcuFlow? If yes, did you install a new lid assembly that is
‘Digital’ compatible? If no...
• Contact H2flow for further guidance
Digital Display is reading
a flow rate that is
significantly dierent to
the AcuFlow
• Check that the DIP switch settings applied in ‘Programming’ section, correcly related to
the AcuFlow model being used. If applied correctly, please contact H2flow for further
guidance.
Turnover rate appears to
be inaccurate
• The turnover rate is calculated by the programmed volume, divided by the flow rate.
Perform a manual calculation as follows: (Volume ÷ Flow Rate from AcuFlow) ÷ 60 =
Turnover rate in hours. If this number is different to the value shown on the AcuFlow
Display, reconnect your laptop and check that the volume has been accurately entered.
External equipment such
as a Heater or Chemical
Feeder, that is being
controlled by the Auxiliary
Output, is turning on and
o erratically
• Reconnect laptop PC and check that the Sensitivity Level has been set to ‘Low’. If yes...
• Check the flow rate reading is well above (or below) the set level programmed to turn
on (or off) the Auxiliary Output. If the actual flow rate is close to the set value and there is
turbulence causing the flow rate to be erratic, consider adjusting the set point value.
Display is showing
the wrong unit of
measurement
• Connect your laptop and check to see the required Unit of Measurement (US GPM, LPM
or M3/hour) has been selected. Change as necessary.

16. environmental
See specification section for environmental operating conditions.
For product disposal, follow all local environmental requirements mandated for plastic and electronic equipment.
17. standards & approvals
Display & Sensor NSF 50 certified, (indoor use only)
Power Supply UL, cUL, CE
www.h2flow.net Tel: [phone] (Toll Free) OR ([phone] (International)
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www.h2flow.net Tel: [phone] (Toll Free) OR ([phone] (International)
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18. NSF 50 accuracy certification
The accuracy of AcuFlow Digital has been independently certified by NSF to the NSF 50 Standard for Flow Meters. At the
time of printing, AcuFlow Digital is the only digital flow meter in the world to have been certified to this rigorous standard.
The NSF 50 flow meter standard has five levels of accuracy that a flow meter can be certified to - Levels 1 to 5 (L1-L5), and
where L1 is the most accurate:
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%.
AcuFlow Digital connected to
AcuFlow model AcuFlow Digital accuracy Flow Range (GPM)
AF-15 L1 20-90
AF-15-U L1 20-90
AF-2 L1 20-110
AF-2-U L1 20-110
AF-25 L1 20-110
AF-3 L1 90-240
AF-4 L2 150-450
AF-6 L1 300-1000
AF-8 L1 600-1800
AcuFlow Digital has been certified to NSF 50 as follows: