DRYDEN AQUA 90028 Operating Manual - Page 7

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Installation cont.

6.2. Installing FlowVis Digital to an existing 3"(DN80) or 4" (DN100) FlowVis

Remove the screws from the existing lid of the FlowVis unit and remove the lid

assembly.

It is not uncommon for the FlowVis 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 off with a screwdriver or similar

device. Instead, momentarily open a valve that is either upstream or

downstream to release the vacuum.

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.

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.

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 FlowVis scale

should be toward the direction of flow.

Referring to Fig.2.5 (right), identify the required side of the FlowVis to mount

the FlowVis sensor, ensuring that the sensor is fully seated and the screw holes

line-up with those on the FlowVis lid assembly.

Place 6 of the 8 FlowVis screws in the lid assembly, and use the 2 longer screws

provided with your FlowVis Digital (Fig.1.3 on page 4) in the holes for the

sensor. Do not tighten.

Using a hand Phillips-head screwdriver, slowly tighten the screws in a diagonal

pattern, per the diagonal sequence shown in Fig.2.6. 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:

the screws in the FlowVis 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.

Proceed to section 6.3 to complete the installation of your FlowVis Digital.

Under no circumstances should

Fig 2.5

Fig 2.6