H2flow ACUFLOW Operating Manual page 6

Pipe Configurations other than those used by NSF for Testing
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.
NSF 50 Accuracy Levels
The NSF 50 Standard for flow meters, has five levels of accuracy (L1-L5) that are expressed as follows:
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%.
Installation of Saddle-clamp style models (AF-DN150 and AF-DN200)
AcuFlow models AF-DN150 and AF-DN200, use Schedule 80 Saddle Clamps. Dimensional details are as follows:
AcuFlow Model
AF-DN150
AF-DN200
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.
6
Saddle Size
6" x 3"
8" x 4"
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.
www.h2floweurope.com • Tel: (+34) 609 31 52 82
Hole to be Drilled in Pipe
� 76.2
� 101.6
Angle for Hole / Saddle Clamp
45º
45º