Dwyer MVR User Manual

ViewRite

Magnetic Liquid Level Indicator

Instruction Bulletin No. 204129

Thank you for purchasing the Dwyer ViewRite Magnetic Level Indicator . Please read this document prior to installing your ViewRite and store it where it may be readily referred to for familiarization and maintenance purposes. If you require any additional information, you are welcome to call Dwyer at the number shown below.

1-219-879-8000

Record the Part Number of your ViewRite here to use when ordering spare or replacement parts: Part Number:____________________

ViewRite Operating Principle

The liquid level of a tank is made visible, even at great distances, through the use of a shock and vibration-proof magnetic level indicator that employs “flags” arranged within a specially constructed external housing: the flag assembly . The two sides of each pivoting flag are marked with contrasting colors. A permanent magnet is encapsulated inside each flag and forms a secure magnetic interlock with the adjacent flags. As the liquid level rises, a float equipped with a permanent magnet causes each of the flags to begin rotating in turn. This action exposes the contrasting (fluid level indicating) color on the other side of the flag. As the float and liquid level rise, each flag below the level of the float completes a 180 degree rotation, while remaining magnetically interlocked with the other lower flags. Together, the rotated flags display a band or column of color, the height of which corresponds with the liquid level within the tank. An exclusive feature of the ViewRite is the patented magnetic guide that is integrated into the flag assembly. This magnetic attraction ensures that the float is always aligned for optimum performance and exactness, regardless of any shock, vibration, or rapid change to the level of fluid in the tank.

Flag Channel

Liquid

Magnetic Flags

(Plain Side Out)

Magnetic

Float

Magnetic Flags

(Colored

Side Out)

Weldment

Standard and Mini-ViewRites are supplied with the floats packed either separately , or securely strapped to the unit. The float supplied with each unit has been designed to the specific gravity of the fluid being monitored, so that the permanent bar magnet will always seek and indicate the fluid surface. Because of the attraction of the permanent bar magnet in the float and the patented magnetic guide, the ViewRite flag assembly can be rotated to a position which will allow for optimum viewing.

Tank

(See the Maintenance Section on page 4 for instructions on how to rotate your ViewRite flag assembly.)

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Important!

Read the following instructions completely - BEFORE installing the ViewRite.

Installation Precautions and Preparation

Failure to observe these precautions could affect the operation of your unit.

1. When locating the tank ports for the ViewRite, make sure that no strong magnetic fields or magnetic materials (such as railings, protective cages, I-beams, etc.) will be any closer than 6 inches (153 mm) from the ViewRite.

2. Make necessary efforts to ensure that all tank-side modifications and equipment; i.e., the mating flanges, NPT ports or shut-off valves (if used) will align properly with the connections. Improper alignment could cause distortion and may damage welds and compromise the integrity of the ViewRite and/or the tank.

3. After any necessary tank modifications are completed, the tank should be cleaned to remove contaminants. This will ensure that the installation is free of foreign particles; especially those which could be magnetic and which could impair the performance of the ViewRite.

4. Do not begin the installation of the ViewRite until all necessary tools and materials are obtained. (Such as mating flange gaskets, bolting hardware, etc. )

5. Gasket material typically supplied with the standard ViewRite unit is either Viton or nitrile rubber, Garlock 3000 style. Higher pressure units are typically supplied with FlexitallicTM gaskets.

6. All supplied flag assembly clamps are intended to be installed with a torque on the clamp screw not to exceed 5 lb.-inches.

Installation

Caution

Handle the ViewRite with care to avoid damaging the threaded areas, flange surfaces, etc.

For Standard ViewRites (Alloy and Mini)

1. Remove the protective packing materials from your ViewRite.

2. Position the unit horizont ally on a level surface.

3. Unpack the float assembly or, with the aid of a wire-cutter or similar device, remove the strapping that secures the float to the exterior of the ViewRite Unit.

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Warning D0 NOT : 1) Hold the V iewRite in a vertical position or 2) Drop the float assembly into the unit. Avoid this or any action which could damage or dent the float. Such damage could cause the float to crush under normal working pressures.

TOP

Weldment

Float

TOP

Weldment

Float

Flange

Remove Bolts

Standard ViewRite

Remove Bolts

Mini ViewRite

4. Remove the end cap or flange attaching bolts, as indicated in the appropriate drawing. Then remove the end cap or flange.

5. With the unit still in a horizontal position, insert the float assembly into the weldment, with the “TOP” indication on the float assembly moving in the same direction as the “UP” arrows that are located on each side of the externally mounted flag assembly.

6. With the gasket or O-ring properly positioned, reassemble the end cap or flange to the weldment. Tighten the end cap or flange bolts securely, using the proper recommended torque value as supplied in Figure A, page 4.

7. Slowly raise the top end of the ViewRite, while the bottom end remains on the level surface, permitting the float to slowly slide to the bottom, avoiding any sudden impact damage to the float assembly.

8. Move the ViewRite to the tank and position the unit with the end marked “TOP” pointing upwards. Install any necessary mounting gaskets or seals1, and align the mating port flanges, NPT’s or connections of the tank with those of the ViewRite. DO NOT A TTEMPT T O FORCE ALIGNMENT. To do so may damage the welds or

compromise the integrity of the ViewRite. While following standard practices and procedures, tighten the flange bolts, NPT’s or connections. Recommended torque values are supplied in Figure A, page 4.

9. Before Filling the T ank . . . . Be sure that the inst allation is free of foreign particles, especially any that are

magnetic. Check that all connections are secure. A hydrostatic pressure test of the complete assembly is recommended.

NOTE

Dwyers recommends that you include at least one support bracket in your installation for ViewRite units greater than 10 feet (120 inches, 3048 mm) in length. Depending on the specific installation, a load-bearing support at the base of the ViewRite may be beneficial.

______________________________________

Gaskets or seals for the port flanges are not supplied with the ViewRite.

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