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Magnetrol Tuffy Instruction Manual And Parts List
Magnetrol Tuffy Instruction Manual And Parts List

Magnetrol Tuffy Instruction Manual And Parts List

Liquid level controls with pneumatic switches

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INSTRUCTION MANUAL AND PARTS LIST
DESCRIPTION
Tuffy liquid level switches are designed for horizontal mount-
ing in a tank or vessel through threaded or flanged pipe con-
nections. 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
BE 44-605.
OPERATING PRINCIPLE
Figures 1 and 2 illustrate the simple Magnetrol operating
principle. Switching action is obtained through the use of a
magnet attached to a float and a switching mechanism.
These two basic component assemblies are separated by a
non-magnetic, pressure tight barrier.
APPLICATIONS
Tuffy is recommended as a high or low alarm switch for
clean liquid applications only.
Magnet
pivot
Air inlet B
(no air flow)
Air inlet A
Spring
Valve
plunger
Air outlet C
Valve body
Figure 1: Low level operation – direct acting
Magnet
pivot
Air inlet B
Air inlet A
(no air flow)
Spring
Valve
plunger
Air outlet C
Valve body
Figure 2: High level operation – direct acting
®
(For Tuffy controls with electric switches, consult bulletin BE 44-605)
Tuffy body
(non-magnetic)
Magnets
Pivot
Float
Falling level
Pivot arm
Tuffy body
(non-magnetic)
Rising level
Magnets
Float
Pivot
Pivot arm
TUFFY
Liquid Level Controls
with Pneumatic Switches
OPERATING CYCLE
At a "low operating level" of liquid in a tank or vessel (refer
to Figure 1), 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 out-
let C. As liquid level rises, for "High Operating Level" indi-
cation (refer to Figure 2), the float moves the magnet down-
ward 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.
For direct acting low level operation, air inlet A is closed off
when liquid level increases. Conversely, for direct acting
high level operation, 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. The air inlet that is not in use
should be plugged to prevent foreign materials from entering.
UNPACKING
Unpack the instrument carefully. Inspect all units for dam-
age. Report any concealed damage to carrier within 24
hours. Check the contents of the packing slip and purchase
order. Check and record the serial number for future refer-
ence when ordering parts.
MODEL IDENTIFICATION
PNEUMATIC SWITCH
0
3
9
6
0 0
0
®
SPECIFIC GRAVITY
0
0,6 minimum
4
0,4 minimum
1 0

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Summary of Contents for Magnetrol Tuffy

  • Page 1 B is used for low level. The air inlet that is not in use should be plugged to prevent foreign materials from entering. APPLICATIONS Tuffy is recommended as a high or low alarm switch for clean liquid applications only. UNPACKING...
  • Page 2 0–13.8 bar (0–200 PSIG). Refer to b. Nozzle must be checked for horizontal alignment. Figure 3 for location of air inlets. Tuffy mounting does not differ for high level or low level Connect outlet air line to the ⁄...
  • Page 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.
  • Page 4 SERVICE POLICY Owners of Magnetrol products 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. Magnetrol International will repair or replace the control, at no cost to the purchaser, (or owner) other than trans- portation cost if: a.