Series K Pneumatic Switch Mechanism Installation and Operating Manual Non-Bleed Switch For Liquid Level Switches Read this Manual Before Installing This manual provides information on the Series K Pneumatic Switch Mechanism. It is important that all instructions are read carefully and followed in sequence. Detailed installation and hook-up 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 electrical equipment when working with or around high voltage. Always shut off the power supply before touching any components. 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. Notice of Copyright, and Limitations Copyright © 2010 Magnetrol International, Incorporated. All rights reserved. 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. Warranty All Magnetrol mechanical level and flow controls are warranted free of defects in materials or workmanship for five 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 guarantees the highest level of quality throughout the company. Magnetrol is committed to providing full customer satisfaction 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. 42-686 Series K Pneumatic Switch Mechanism 1.0 Description The Series K is a non-bleed pneumatic switch. It incorporates a three-way pneumatic valve assembly, actuated by a magnet swing carriage. Mechanisms are available as an option for most Magnetrol liquid level controls. 2.0 Technology Magnetic force and the lever mechanism transmit movement from the pressure vessel to the pneumatic valve. Figure 1 shows the position of the attraction sleeve and magnet when the liquid level is such that the attraction sleeve is below the field of the magnet. In this position, the flapper has been drawn away from the valve rod, permitting the inlet air or gas to flow to a pneumatic operator. Inlet air pressure against the ball allows the ball to seal off the exhaust outlet. Figure 2 shows the position of the attraction sleeve and the magnet when the liquid level has risen, causing the attraction sleeve to attract the magnet against the enclosing tube. In this position, the flapper actuates the air valve, closing the supply inlet and opening the exhaust port, which reduces the pressure in the operator to atmospheric. This action, “close” on high, is reversible to “open” on high with two simple adjustments (refer to page 4). NOTE: In order to protect the switch assembly from contaminants, filtered and dried gas/air supply is recommended. Pivot Non-magnetic enclosing tube D Non-magnetic enclosing tube Upper shoulder screw R R Reverse link position for opposite action Attraction sleeve Flapper adjustment screw Air valve Actuating link Pivot Lower shoulder screw Air supply open position Magnet (swing out position) To operator Flapper Exhaust closed Pivot Falling level D Attraction sleeve Flapper adjustment screw Air valve Upper shoulder screw Reverse link position for opposite action Actuating link Pivot Lower shoulder screw Magnet (swing in position) Air supply closed position To operator Flapper Exhaust open Rising level Figure 1 Figure 2 Attraction sleeve below field of magnet Attraction sleeve in field of magnet 42-686 Series K Pneumatic Switch Mechanism 1 3.0 Reversing Pilot Action Enclosing tube All Series K Pneumatic Switch Mechanisms are shipped from the factory in the direct (close) position at high level. They can be field modified for the reverse (open) position by following the steps below: 1. The action can be reversed by first removing the upper shoulder screw from the actuator link and moving it from the direct (D) position to the reverse (R); refer to Figure 3. 2. Loosen the screw that positions the spring bracket and move it from the direct (D) position to the reverse (R) position; refer to Figure 4. 3. Fasten screw securely. Reverse position Direct position Fall-out stop Upper shoulder screw Magnet Tab Frame screw Actuator link Housing base The switch is now setup for reverse action. Enclosing tube nut Locking screw 4.0 Figure 3 Locating Air Line Connection Caution: Instrument is designed for dry air/gas service. The housing base may be rotated a full 360° for your convenience in connecting the air supply. 1. Loosen both the special locking screw above the enclosing tube nut and the frame screw. Refer to Figure 3. 2. Rotate the entire base to the desired position. 3. Tighten both the locking screw and the frame screw. 4.0.1 Remove complete mechanism Enclosing tube Direct position Fall-out spring 1. Disconnect air line from air line adapter. 2. Loosen both the special locking screw, above the enclosing tube nut, and the frame screw approximately 3 to 4 turns. Refer to Figure 3. 3. Lift the entire base straight up and off the enclosing tube. Spring bracket 1 ⁄4" NPT Air line inlet connection Reverse position ⁄4" NPT Outlet connection 1 Figure 4 2 42-686 Series K Pneumatic Switch Mechanism 5.0 Preventive Maintenance 5.0.1 Nozzle cleaning To clean the nozzle, follow the steps below: 1. Unscrew and remove the adapter. Refer to Figure 5. Enclosing tube Caution: Do not lose the ball which will drop out when the adapter is removed. Socket set screw 1 ⁄16" Allen wrench Air line adapter Ball Nozzle Actuating rod Flapper Figure 5 2. The ball and actuating rod will now fall out when the switch is tipped. 3. Unscrew the socket set screw with a 1⁄16" Allen wrench. This will prevent damage to the flapper when performing step 4. 4. Insert a 1⁄16" diameter wire into the nozzle from the air line connection side. Refer to Figure 6. The wire may be moved back and forth to clean the opening of any accumulated matter. 5. Reassemble the actuating rod, ball, and adapter; insert into nozzle. Refer to Figure 5. 6. Securely tighten the air line adapter. 7. Readjust the flapper to its original position; refer to Nozzle Flapper Readjustment procedure. 5.0.2 Nozzle flapper readjustment Magnet (yellow or red dot) Enclosing tube Socket set screw ⁄16" Diameter wire 1 Flapper Nozzle Figure 6 42-686 Series K Pneumatic Switch Mechanism 1. Connect an air line to the adapter. 2. Pressurize the air line. 3. Adjust the flapper with the socket set screw for the desired action: Direct Action A. Hold the magnet against the enclosing tube. B. Adjust the socket set screw with a 1⁄16" Allen wrench until the air flow stops, plus an extra one-eighth turn. Reverse Action A. Hold the magnet tab against the fall out stop. Refer to Figure 3. B. Adjust the socket set screw with a 1⁄16" Allen wrench until the air flow stops. 4. Manually actuate the switch under pressure to assure its correct actuation. The unit is now ready for service. 5. Operate control at normal process conditions to verify adjustments. 3 6.0 Replacement Parts 6.1 K Series pneumatic switch Replacement parts for K Series Pneumatic Switch Mechanisms are available as an assembly only. Switch mechanism consists of entire pneumatic assembly mounted in the switch housing base. See figure 7 below. When ordering an assembly, be certain to specify: 1. The model number of the level control in which the switch was installed. 2. The serial number of the level control in which the switch was installed. Refer to nameplate attached to control. Caution: When ordering replacement switch mechanisms, be certain to determine color dot on magnet. Never replace a mechanism having a red dot magnet with one having a yellow dot magnet, and vice versa. 4.66" (118) Switch Code Magnet Part Number KOE KOF KOG KOH KPE KPF Yellow Yellow Red Red Yellow Yellow 89-7501-023 89-7501-023 89-7501-024 89-7501-024 89-7501-025 89-7501-025 1/4" NPT 1.63" (41) 1.63" (41) 5.46" (139) Figure 7 4 42-686 Series K Pneumatic Switch Mechanism 6.2 Switch housing replacement assembly Standard carbon steel housing replacement assemblies are designed for general purpose indoor use installations requiring protection against entrance of dust, water, lint and fiber/oil. Refer to Figure 8. 4.00" (102) or 6.00" (152) Replacement Kit Part Number Description Blue Cover Standard housing cover Short 4" (102 mm) Tall 6" (152 mm) Cover assembly hardware Includes assembly hardware kit 89-6508-001. Figure 8 89-6509-003 89-6510-003 89-6508-001 Carbon steel housing assembly 7.0 “K” Switch Specifications Supply Pressure: Airline Connections: Maximum Leakage Rate: Maximum Airflow: 100 psi Max. supply pressure 40 psi Max. supply pressure Maximum Process Temp.: Housing Protection: Housing Material: Switch Mechanism Material: 8.0 40 psi Max. or 100 psi Max. ⁄ " NPT 0.5 SCFH 1 4 1.1 SCFM 0.7 SCFM +400° F General Purpose/NEMA 1/IP53 Rolled steel/Cast aluminum Stainless steel Switch Codes SWITCH MECHANISM AND ENCLOSURE Switch Code KOG KOH KOE KOF KPE KPF Maximum Supply PSIG 40 40 100 100 100 100 Bar 3 3 7 7 7 7 Magnet Dot Red Red Yellow Yellow Yellow Yellow For use with E-tube Attraction Wall Sleeve Inches (mm) .035 .9 Standard .035 .9 Standard .035 .9 Sheathed or .065 1.7 Standard .065 1.7 Sheathed .065 1.7 Sheathed Cover Height Inches 4 6 4 6 4 6 (mm) 102 152 102 152 102 152 Maximum leakage rate is .5 SCFH at maximum supply pressure. Maximum process temperature is +400° F (+209° C). Example Model Number: B 7 5 1 B 2 42-686 Series K Pneumatic Switch Mechanism 0 5 ASSURED QUALITY & SERVICE COST LESS Service Policy Return Material Procedure 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: 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 factory, prior to the material's return. This is available through Magnetrol’s local representative or by contacting the factory. Please supply the following information: 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 control; 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, credit for the materials returned will be determined on the basis of the applicability of our warranty. 1. 2. 3. 4. 5. Company Name Description of Material Serial Number Reason for Return 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. No claims for misapplication, labor, direct or consequential damage will be allowed. 5300 Belmont Road • Downers Grove, Illinois 60515-4499 • 630-969-4000 • Fax 630-969-9489 • www.magnetrol.com 145 Jardin Drive, Units 1 & 2 • Concord, Ontario Canada L4K 1X7 • 905-738-9600 • Fax 905-738-1306 Heikensstraat 6 • B 9240 Zele, Belgium • 052 45.11.11 • Fax 052 45.09.93 Regent Business Ctr., Jubilee Rd. • Burgess Hill, Sussex RH15 9TL U.K. • 01444-871313 • Fax 01444-871317 Copyright © 2010 Magnetrol International, Incorporated. All rights reserved. Printed in the USA. BULLETIN: 42-686.10 EFFECTIVE: August 2010 SUPERSEDES: June 2002