Tuffy Liquid Level Controls with Pneumatic Switch Owner’s Manual
- June 4, 2024
- Tuffy
Table of Contents
Tuffy Liquid Level Controls with Pneumatic Switch Owner’s Manual
UNPACKING
Unpack the instrument carefully. Make sure all components have been removed from the foam protection. Inspect all components for damage. Report any concealed damage to the carrier within 24 hours. Check the contents of the carton/crates against the packing slip and report any discrepancies to Magnetrol. Check the nameplate model number to be sure it agrees with the packing slip and purchase order. Check and record the serial number for future reference when ordering parts.
MOUNTING
- Ensure that the length and inside diameter of the mounting nozzle are sized correctly to allow for switch actuationat design levels . Refer to Figure 1.
- 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.
- Ensure that the area is free of metallic particles which might be attracted to the magnet holder/counterbalance and interfere with the function of the Tuffy.
- The Tuffy must be installed with the serial number plate on top to ensure correct switching action.
- Inlet air should be filtered with a 5 micron or finer filter. This will extend the life of the valve mechanism. The inlet air pressure should be between 0–13,8 bar (0–200 psi).
- Connect the inlet, outlet and exhaust air line(s) to the appropriate ¼” NPT connection port(s) based on the required valve action. Refer to Figure 1 and Table 1.
Figure 1
Port
| 3-way| Diverter| Selector| 2-way
---|---|---|---|---
N.O.| N.C.| N.O.|
N.C.
A| Inlet| Exhaust| Outlet| Inlet| Inlet| Plug
B| Exhaust| Inlet| Outlet| Inlet| Plug| Inlet
C| Outlet| Outlet| Inlet| Outlet| Outlet| Outlet
N.O.- Direct acting: air supply on switch condition.
N.C.- Reverse acting: air cut-off on switch condition.
Table 1
PRINCIPLE OF OPERATION
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.
Figures 2 and 3 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.
Figure 2: Low level operation – direct acting
At a “low operating level” of liquid in a tank or vessel (refer to Figure
2) , 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 3).
Figure 3: High level operation – direct acting
For direct acting low level operation, air inlet A is closed off when liquid level increases. Conversely, for 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. Plug the air inlet that is not in use to prevent foreign materials from entering.
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 equipment for many years.
WHAT TO AVOID
- 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.
- NEVER attempt to make adjustments without reading the instructions carefully. When in doubt, consult the factory or your local representative.
- 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.
TROUBLESHOOTING
FAILURE TO SHUT OFF OR TURN ON INLET AIR
- Check float for full range of travel; clicking of mechanism should be heard.
- 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.
- 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.
- 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.
MODEL IDENTIFICATION
MECHANICAL SPECIFICATIONS
Description
|
Specification
---|---
Process pressure| Min. S.G. = 0,6: 103 bar @ 150 °C (1500 psi @ 300 °F)
Min. S.G. = 0,4: 34,5 bar @ 150 °C (500 psi @ 300 °F)
Process temperature| -40 °C to +150 °C (-40 °F to +300 °F)
Ambient temperature| Max. 40 °C (100 °F) with max. process temperature
Pneumatic switch supply pressure| Vacuum up to 13,8 bar (200 psi)
Max. leakage rate| 14,16 l/h @ 6,9 bar (0.5 SCFH @ 100 psi)
Max. air flow| 3,40 m³/h @ 6,9 bar (120 SCFH @ 100 psi)
Specific gravity| 0,6 minimum or 0,4 minimum
Wetted parts| 316/316L (1.4401/1.4404) including NACE and ASME B31.3
Housing material| 316 stainless steel, IP 65
REPLACEMENT PARTS
The pneumatic Tuffy is designed for years of trouble free use. Due to the nature of the valve design and the factory calibration required for proper operation, no specific replacement parts are offered.
DIMENSIONS in mm (inches)
IMPORTANT
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 transportation cost if:
- a. Returned within the warranty period; and,
- b. The factory inspection finds the cause of the malfunction to be defective material or workmanship.
If the trouble is the result of conditions beyond our control; or, is NOT covered by the warranty, there will be charges for labour 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, credit for the materials returned, will be determined on the basis of the applicability of our warranty.
No claims for misapplication, labour, direct or consequential damage will be allowed.
RETURNED MATERIAL PROCEDURE
So that we may efficiently process any materials that are returned, it is essential that a “Return Material Authorisation” (RMA) form will be obtained from the factory. It is mandatory that this form will be attached to each material returned. This form is available through Magnetrol’s local representative or by contacting the factory. Please supply the following information:
- Purchaser Name
- Description of Material
- Serial Number and Ref. Number
- Desired Action
- Reason for Return
- Process details
Any unit that was used in a process must be properly cleaned in accordance
with the proper health and safety standards applicable by the owner, before it
is returned to the factory.
A material Safety Data Sheet (MSDS) must be attached at the outside of the
transport crate or box.
All shipments returned to the factory must be by prepaid transportation.
Magnetrol will not accept collect shipments.
All replacements will be shipped Ex Works.
UNDER RESERVE OF MODIFICATIONS SUPERSEDES: November 2011
BULLETIN N°: BE 44-606.5
EFFECTIVE: JULY 2021
Support
European Headquarters & Manufacturing Facility
Heikensstraat 6
9240 Zele, Belgium
Tel: +32-(0)52-45.11.11
e-mail: info@magnetrol.be
www.magnetrol.com
References
Read User Manual Online (PDF format)
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