Ametek Magnetrol Tuffy User manual

Side
Mounted
Float Level
Switch
®




Tuffy Liquid Level Control with Pneumatic Switch
Read this Manual Before Installing
This manual provides information on the Tuffy Liquid
Level Control with Pneumatic Switch. It is important that
all instructions are read carefully and followed in sequence.
Detailed installation and wiring instructions are included in
this manual.
Conventions Used in this Manual
Certain conventions are used in this manual to convey
specific types of information. General technical material,
support data, and safety information are presented in
narrative form. The following styles are used for notes,
cautions, and warnings.
Notes
Notes contain information that augments or clarifies an
operating step. Notes do not normally contain actions.
They follow the procedural steps to which they refer.
Cautions
Cautions alert the technician to special conditions that
could injure personnel, damage equipment, or reduce
a component’s mechanical integrity. Cautions are also
used to alert the technician to unsafe practices or the
need for special protective equipment or specific
materials. In this manual, a caution box indicates a
potentially hazardous situation which, if not avoided,
may result in minor or moderate injury.
Warnings
Warnings identify potentially dangerous situations or
serious hazards. In this manual, a warning indicates an
imminently hazardous situation which, if not avoided,
could result in serious injury or death.
Safety Messages
Follow all standard industry procedures for servicing elec-
trical equipment when working with or around high
voltage. Always shut off the power supply before touching
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.
Warranty
All Magnetrol mechanical level and flow controls are war-
ranted free of defects in materials or workmanship for
three full years from the date of original factory shipment.
If returned within the warranty period; and, upon factory
inspection of the control, the cause of the claim is
determined to be covered under the warranty; then,
Magnetrol will repair or replace the control at no cost to the
purchaser (or owner) other than transportation.
Magnetrol shall not be liable for misapplication, labor
claims, direct or consequential damage or expense arising
from the installation or use of equipment. There are no
other warranties expressed or implied, except special
written warranties covering some Magnetrol products.
Quality Assurance
The quality assurance system in place at Magnetrol guar-
antees the highest level of quality throughout the compa-
ny. Magnetrol is committed to providing full customer sat-
isfaction both in quality products and quality service.
Magnetrol’s quality assurance system is registered to ISO
9001 affirming its commitment to known international
quality standards providing the strongest assurance of
product/service quality available.
Copyright © 2021 AMETEK Magnetrol USA, LLC.
All rights reserved.
Performance specifications are effective with date of issue
and are subject to change without notice. Magnetrol®
reserves the right to make changes to the product described
in this manual at any time without notice. Magnetrol
makes no warranty with respect to the accuracy of the
information in this manual.

3
Tuffy Liquid Level Control with Pneumatic Switch
1 0 Installation
This section provides detailed procedures for properly
installing the Tuffy Liquid Level Control.
 If equipment is used in a manner not specified by
manufacturer, protection provided by equipment
may be impaired.
1 1 Unpacking
Unpack the instrument carefully. Inspect all units for dam-
age. Report any concealed damage to the carrier within 24
hours. Check the contents of the packing slip and report
any discrepancies to Magnetrol. Check the nameplate model
number to be sure it agrees with the packing slip and pur-
chase order. Check and record the serial number for future
reference when ordering parts.
Model Number
Serial Number
1 2 Before You Begin
 
1. 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 within 3°
of horizontal. If mounting the Tuffy in an external cage,
ensure that the cage is mounted within 3° of horizontal
and that the top/bottom piping is within 3° of vertical in all
directions.
3. Ensure that the area is free of metallic particles which might
be attracted to the magnet holder/counterbalance and inter-
fere with the function of the Tuffy.

No special equipment or tools are required to install the
Tuffy Liquid Level Switch. The following items are recom-
mended:
• Wrenches, flange gaskets and flange bolting appropriate for
process connection(s).
• Pipe wrench
• Level

1/4" NPT
inlet (A)
1/4" NPT
outlet (C) 3.00" maximum
nozzle length
1/4" NPT
inlet (B)
Float must
clear inner
tank wall
Wrench flats
Serial number tag

4Tuffy 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. 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.
 The pneumatic Tuffy must be installed with the serial
number plate on top to ensure correct switching action.
 
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.
 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.
 
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)


5
Tuffy Liquid Level Control with Pneumatic Switch
1 4 Airline Connections
1. Inlet air should be filtered with a 5 micron or finer filter.
This will extend the life of the valve mechanism.
2. Connect the inlet air line to the 1⁄4" NPT connection for
either air inlet A or air inlet B, depending on the valve
action desired (refer to Figure 3). Inlet air pressure should
be between 0 200 psig. Refer to Figure 1 for location of air
inlets.
3. Connect outlet air line to the 1⁄4" NPT connection on the
bottom of the valve. This air outlet is designated with a
“C”. Refer to Figure 1 for location.
4. If 3-way function is used, attach the exhaust air line to the
appropriate 1⁄4" NPT connection based on valve action
described in Figure 3.
2 0 Reference Information
2 1 Description
Tuffy liquid level switches are designed for horizontal
mounting in a tank or vessel through threaded or flanged
pipe connections. Standard models are equipped with a
three-port/two-position valve actuated by a magnetically
actuated pivoted cam mechanism. This instruction manual
covers Tuffy level controls which have pneumatic switches.
For Tuffy controls with electric switches, please consult
Bulletin 44-607.
2 2 Theory of Operation
At a “low operating level” of liquid in a tank or vessel (refer
to Figure 4), the float moves the magnet upward and into
the 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 rises, the float moves the magnet
downward until the switch mechanism magnet reverses
position, allowing the valve plunger to move so that air is
allowed to pass from air inlet B to air outlet C (refer to
Figure 5).
For direct acting low level operation, air inlet A is closed off
when liquid level increases. Conversely, for high level opera-
tion, air inlet B is closed off when liquid level recedes.
For reverse acting operation, air inlet A is used for high level
and air inlet B is used for low level. Plug the air inlet that is
not in use to prevent foreign materials from entering.

N.O.—Direct acting: Air supply on switch condition.
N.C.—Reverse acting: Air cut-off on switch condition.
   
      
   
AInlet Plug Inlet Exhaust Outlet Outlet
B Plug Inlet Exhaust Inlet Outlet Inlet
C Outlet Outlet Outlet Outlet Inlet Outlet
Float
Tuffy body
(Non-magnetic)
Magnet
Pivot
Falling level
Air inlet (B)
(no air flow)
Air inlet (A)
Air outlet (C) Pivot arm
Magnet
pivot
Spring
Valve
plunger
Valve body
Float
Pivot
Rising level
Tuffy body
(Non-magnetic)
Air inlet (B)
Air inlet (A)
(no air flow)
Air outlet (C)
Spring
Valve
plunger
Valve body
Magnets
Pivot arm
Magnet
pivot





6Tuffy Liquid Level Control with Pneumatic Switch
2 3 Preventive Maintenance
Periodic inspections are a necessary means to keep your
Magnetrol level control in good working order. This control
is a safety device to protect the valuable equipment it serves.
A systematic program of preventive maintenance should be
implemented when the control is placed into service. Based
on utilizing a preventative maintenance program and
observing the following section on “what to avoid”, your
Tuffy will provide reliable protection of your capital equip-
ment for many years.
WHAT TO AVOID
1. Use only the 2" wrench flats to install or remove the unit.
Refer to Figure 1. Use of any other surface could change the
calibration. The valve body is calibrated at the factory and
locked in place.
2. NEVER attempt to make adjustments without reading the
instructions carefully. When in doubt, consult the factory 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 the float rod
to jam.
2 4 Troubleshooting
If Tuffy fails to shut off or turn on inlet air:
1. Check float for full range of travel; clicking of mechanism
should be heard.
2. If the complete Tuffy mechanism operates properly when
removed from service, check to be certain that liquid is
entering the storage tank or vessel. A valve may be closed
or a pipe line clogged.
3. If the float is determined to be filled with liquid or is
collapsed, the entire level switch must be replaced. Do
not attempt to repair the float.
4. The factory calibration setting should not require any
adjustment in the field. Check to see that the unit is
installed properly with the serial number tag positioned
on the top of the unit. If the unit is still not operating
correctly, please contact the factory.
NOTE: When in doubt about the condition or performance of a
control, please contact the factory for assistance.

7
Tuffy Liquid Level Control with Pneumatic Switch
2 6 Parts
 

3.75 (95)
Float
minimum
clearance
2" NPT
2.50 (64) Dia.
.75
(19)
C
L
3.00 (76) max.
Nozzle length
7.96 (202) [Sp. Gr. 0.6 min.]
Float size = 2.00 (51) Dia. x 4.57 (116) long
8.91 (226) [Sp. Gr. 0.4 min.]
Float size = 2.00 (51) Dia. x 5.12 (130) long
Switch actuates
Rising level
Falling level
Switch actuates
12.94 (329) [Sp. Gr. 0.4 Min]
12.00 (304) [Sp.Gr. 0.6 Min]
1/4" NPT
inlet (A)
1/4" NPT
outlet (C)
1/4" NPT
inlet (B)
Pressure: 0.6 SG 1 00 psig at +300 °F (103 bar at +149 °C)
0.4 SG 00 psig at +300 °F (34 bar at +149 °C)
Process Temperature: -40 to +300° F (-40 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. SCFH (0.01 SCMH @ 100 psig (6.9 bar))
Minimum Air Flow: 2.0 SCFM (0.06 SCMM @ 100 psig (6.9 bar))
Specific Gravity: 0.6 minimum or 0.4 minimum
Materials of Construction: 316/316L SS wetted components including NACE and ASME B31.3
Housing: 316 stainless steel
2 5 Specifications
 
  

0 3 9 T ffy®Float Switch

6 Pne matic

0 316 Stainless steel with 1 /4" NPT airline connections

0 0.60 minim m S.G., 1500 psi maxim m press re
4 0.40 minim m S.G., 500 psi maxim m press re
2 7 Model Numbers

Service Policy
Owners of Magnetrol may request the return of a control
or any part of a control for complete rebuilding or
replacement. They will be rebuilt or replaced promptly.
Controls returned under our service policy must be
returned by Prepaid transportation. Magnetrol will repair
or replace the control at no cost to the purchaser (or
owner) other than transportation if:
1. Returned within the warranty period; and
2. The factory inspection finds the cause of the claim to
be covered under the warranty.
If the trouble is the result of conditions beyond our con-
trol; or, is NOT covered by the warranty, there will be
charges for labor and the parts required to rebuild or
replace the equipment.
In some cases it may be expedient to ship replacement
parts; or, in extreme cases a complete new control, to
replace the original equipment before it is returned. If this
is desired, notify the factory of both the model and serial
numbers of the control to be replaced. In such cases, cred-
it for the materials returned will be determined on the
basis of the applicability of our warranty.
No claims for misapplication, labor, direct or consequen-
tial damage will be allowed.
Low Voltage Directive
For use in Installations Category II, Pollution Degree 2.
If equipment is used in a manner not specified by the
manufacturer, protection provided by equipment may be
impaired.
Return Material Procedure
To efficiently process any materials that are returned, it is
essential that a “Return Material Authorization” (RMA)
number be obtained from the factory, prior to the mater-
ial's return. This is available through your local Magnetrol
representative or by contacting the factory. The following
information is required:
1. Company Name
2. Description of Material
3. Serial Number
4. Reason for Return
5. Application
Any unit that was used in a process must be properly
cleaned in accordance with OSHA standards, before it is
returned to the factory.
A Material Safety Data Sheet (MSDS) must accompany
material that was used in any media.
All shipments returned to the factory must be by prepaid
transportation.
All replacements will be shipped F.O.B. factory.




705 Enterprise Street • Aurora, Illinois 60504-8149 USA
630.969.4000 • info.magnetr[email protected] • magnetrol.com
Copyright © 2021 AMETEK Magnetrol USA, LLC