Operation - H2flow ACUFLOW Operating Manual

Tightening Lid Screws
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 fl apper 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 fi nal torque of 25 inch / pounds or 2.8 Nm.

OPERATION

Reading the Flow Rate
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
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(1) Indicator arm is
being viewed too far
forward / near the rear
of the lid.
(1)
(2)
(3)
5
1
3
7
2 6
(2) Indicator arm is
being viewed correctly.
(3) Indicator arm is
being viewed too far
back / front of the lid.
8
4
7