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4

Tuffy Liquid Level Control with Pneumatic Switch

1.3

Mounting

The pneumatic Tuffy Liquid Level Switch is available with a
2" NPT mounting bushing, a variety of flange mountings
and external cages for mounting outside of the vessel.

1.3.1 Mounting an NPT Tuffy

1. Apply either Teflon

®

tape or Petrolatum to the mounting

threads to prevent galling.

2. Engage the 2" NPT by hand to avoid damaging threads.
3. Using a pipe wrench, rotate the unit clockwise until threads

are tight in mounting. Ensure that the serial number plate is
on top. See Figure 1.

Caution:

The pneumatic Tuffy must be installed with the serial
number plate on top to ensure correct switching action.

1.3.2 Mounting a Tuffy with Flange

1. Have proper flange bolting and gasket on hand.
2. Carefully align mounting flange with the vessel mounting

flange.

3. Ensure that the flange gasket is seated properly. Install

flange bolts and nuts.

4. Tighten alternating flange bolts in a star pattern.
5. Install Tuffy into 2" NPT of mounting flange as described

in Section 1.3.1 above.

Caution:

Operation of all buoyancy type level devices should be done
in such a way as to minimize the action of dynamic forces on
the float or displacer sensing element. Good practice for
reducing the likelihood of damage to the control is to equal-
ize pressure across the device very slowly.

1.3.3 Mounting External Cage Tuffy

A typical Tuffy external cage installation is shown in Figure 2.

1. Install cage so that tappings are within 3° of vertical in all

directions. Check installation with a level.

2. Mount cage as close to vessel as possible, to provide more

accurate level in cage. Long pipe runs may result in cooler,
denser liquid than that in the vessel and cause inaccurate
level in the Tuffy cage.

3. Use pipe of sufficient size and strength to support the

control. If necessary, provide a hanger or stand to help
support the weight of the cage.

4. All piping should be straight and free of low spots or pockets.

Lower liquid line should drain toward vessel and upper line
toward Tuffy cage.

5. Shut-off valves are recommended for installation between

the vessel and the cage assembly.

6. Once external cage is mounted, install pneumatic Tuffy into

cage per Section 1.3.1 or 1.3.2.

C

L

Pressure
vessel

Shut–off
valve

Safety

check

valve

Shut–off
valve

Drain valve

Switch
actuation
level

1/4" NPT
inlet (A)

1/4" NPT
outlet (C)

1/4" NPT

inlet (B)

Figure 2

Содержание Tuffy 039-6000-100

Страница 1: ...Side Mounted Float Level Switch Tuffy Liquid Level Controls with Pneumatic Switch Installation and Operating Manual...

Страница 2: ...any components WARNING Explosion hazard Do not connect or dis connect equipment unless power has been switched off or the area is known to be non hazardous Notice of Trademark Copyright and Limitation...

Страница 3: ...Ensure that the length and inside diameter of the mounting nozzle are sized correctly to allow for switch actuation at design levels Refer to Figure 1 2 Ensure that the mounting nozzle or coupling is...

Страница 4: ...ould be done in such a way as to minimize the action of dynamic forces on the float or displacer sensing element Good practice for reducing the likelihood of damage to the control is to equal ize pres...

Страница 5: ...he field of the switch mechanism magnet As a result the magnets repel causing the pivot arm and valve plunger to move so that air is allowed to pass from air inlet A to air outlet C As liquid level ri...

Страница 6: ...tory or your local representative 3 NEVER use in systems which have excess iron particles in the solution The magnet at the counterweight end of the float can attract the particles which could cause t...

Страница 7: ...40 F to 300 F 40 C to 149 C Ambient Temperature Max 100 F 38 C with maximum process temperature Pneumatic Switch Supply Pressure Vacuum to 200 psig 13 8 bar maximum Maximum Leakage Rate 0 5 SCFH 0 015...

Страница 8: ...e impaired Return Material Procedure So that we may efficiently process any materials that are returned it is essential that a Return Material Authorization RMA number be obtained from the fac tory pr...

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