Pressure Switch SOR. Sifter ready to run: Adequate pressure to switch. Sifter not ready to run: Either loss of air pressure, or open guard.

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1 Switch SOR SOR (TB) 1 of 1 The wiring for the pressure switch requires some explanation. Great Western sifters use the SOR pressure switch to detect a lack of pressure. Black is normally open, and red is normally closed. When the sifter is operating normally, the pressure will trip the switch indicating the sifter is ready to run. This will close the black, and open the red. A loss of air pressure on the pneumatic circuit (which results from removal of the guards) causes the black to open and the red to close which should stop the sifter and prevent it from starting. Blue Black Red Sifter ready to run: Adequate pressure to switch. Blue Black Red Sifter not ready to run: Either loss of air pressure, or open guard. When the sifter is ready to run with pressure applied to the circuit: The black and blue circuit will be closed. The red and blue circuit will be open. Note: The manufacturer s documentation for the SOR switch assumes the switch will be used to sense the point where excessive pressure is achieved. Black is normally open, and red is normally closed in their literature but this is not how Great Western applies the switch. 7/31/2007

2 Mini-Hermet Switches with Hermetically Sealed Electrical Switching Elements General Instructions The pressure switch may be line mounted to either rigid process piping or electrical conduit. The body of the pressure switch should be clamped in the area between the set point adjustment protrusion and the pressure port to a suitable member on applications when rigid process piping or electrical conduit is not available. General These instructions cover installation, process connection, electrical connection and calibration of SOR, Inc. s Mini-Hermet Explosion Proof Switches. The switching element is hermetically sealed in an explosion proof capsule that is UL Listed and CSA Certified for hazardous locations Class I, Groups A, B, C & D; Class II, Groups E, F & G; Divisions 1 & 2 and SAA Approved for Ex s IIC T6 IP65 Class 1, Zone 1. When certain options are ordered, the Switch may be ATEX Certified EEx d IIC or UL Listed and CSA Certified Class I, Groups A, B, C & D; Class II, Groups E, F & G; Divisions 1 & 2. Static-O-Ring Type (prefaced by 1, 5, 6, 9, 10 or 56) Typical Model No. 6AG-EF3-N4-C1A The Static-O-Ring Type Switch with optional wetted parts is suitable for a wide variety of process applications. This type is not recommended for high-pressure fluid power applications where high shock pressure and high cycle rates are expected. Use SOR, Inc. Pivot Seal type for fluid power applications. Pivot Seal Type (prefaced by 2 or 3) Typical Model No. 3AH-EF45-P1-C1A The Pivot Seal Type Switch is generally suitable for fluid power hydraulic applications where high shock pressures and high cycle rates are expected and where only normally industrial clean hydraulic fluid is used. Use Static-O-Ring type for other process applications. Design and specifications subject to change without notice. Installation This product should only be installed by trained and competent personnel. Process Connection Use two wrenches when connecting process pipe: a 1-1/8 inch open-end wrench to hold the hex port while connecting the process pipe; the other wrench to tighten the process pipe or tube fitting. CAUTION: When rigid process piping is used, it is important that no bending or torsional forces be imposed on the pressure switch. Electrical Connection Ensure that wiring conforms to all applicable local and national electrical codes and install unit(s) according to relevant national and local safety codes. Use a 1-1/8 inch open-end wrench to hold the hex on the electrical connection while conduit or conduit fitting is being tightened. SPDT 2-SPDT Blue (C1) Black (NO) Red (NC) Green (GND) Blue (C1) Black (NO) Red (NC) Yellow (C2) Brown (NO2) Orange (NC2) NO1 NO2 Green (GND) For latest revision, see SOR Form 168 (04.05) Printed in USA Registered Quality System to ISO 9001

3 CAUTION: Do not use a pipe wrench or strap wrench on the round body nor an open-end wrench on the hex pressure port while tightening the conduit connection, because the hermetically sealed switching element capsule has been precisely positioned and locked during manufacture. Excessive force could overcome the lock and cause movement which will adversely affect operation or render the pressure switch inoperative. Should movement occur, factory calibration must be performed in order to restore normal operation. The electrical switch element capsule assembly contains UL Listed and CSA Certified factory-sealed leads. A conduit seal is not required to preserve explosion proof integrity. Electrical leads are marked NC (Normally Closed), NO (Normally Open) and C (Common). Electrical switching elements are snapaction and are either 1-SPDT or 2-SPDT set to actuate simultaneously. Calibration Mini-Hermet Switches are field adjustable across the entire cataloged range for a particular piston/spring combination. Field adjustable models have a set point adjustment under the removable weathertight cap. It is not necessary to disconnect the electrical power, since the electrical switching element is inside the hermetically sealed explosion proof capsule, thereby maintaining explosion proof integrity. 1. Remove knurled weathertight cap. 2. Use 1/8 inch hex (Allen type) wrench to turn adjusting screw to achieve desired set point. Turn adjusting screw clockwise (in) to increase set point; turn adjusting screw counterclockwise (out) to decrease set point. Use an external pressure measuring device to accurately calibrate set points. CAUTION: Do not unthread the adjusting screw more than two threads below the flush point of housing as calibration could be adversely affected. WARNING: Units in hazardous locations - Prior to removal from service, make sure that the work area is declassified. Failure to do so could result in severe personal injury or substantial property damage. Special Conditions for Safe Use ATEX, JIS/RIIS units 1. The terminal box to which the equipment is attached must, together with the switch, ensure the requisite thread engagement for Apparatus Group IIC. 2. The reliability of the diaphragm has been assessed on the basis of 100,000 operations. The diaphragm and O-ring seal assembly must be changed before this number of operations is exceeded. 3. The reliability of the pivot seal has been assessed on the basis of 250,000 operations. The pivot seal assembly must be replaced before this number of operations is exceeded. 4. The reliability of the seal for pistons sizes 5, 6 and 9 has been assessed on the basis of 1,000,000 operations. The seal assembly must be replaced before this number of operations is exceeded. 5. The reliability of this seal for piston size 1 has been assessed on the basis of 700,000 operations. The seal assembly must be replaced before this number of operations is exceeded 6. The reliability of the seal for piston size 10 has been assessed on the basis of 300,000 operations. The seal assembly must be replaced before this number of operations is exceeded. 7. The permanently attached cables are to be suitably terminated and protected from impact. 8. When the switch is attached to an increased safety terminal box the assembly must be capable of with standing the impact test specified in BS 5501: Part 1: The sealing arrangements must maintain the minimum IP54 rating required by the increased safety enclosure. 10.The switch must attach to the enclosure using an existing entry. 3. After the set point has been calibrated, replace the weathertight sealing cap tightly to ensure the weathertight integrity of the device. SOR, Inc. discourages field modifications, change-out of wetted parts or repair. It is recommended that products be returned to SOR, Inc. for inspection and necessary repair work. Any field work should be performed by qualified instrument technician with formal SOR, Inc. procedures. NOTE: UL Listed models are suitable for handling petroleum-based, flammable and combustible liquids and gases, air, oxygen and water at fluid temperatures not exceeding 40 C and ambient temperatures not exceeding 40 C. Page 2 of 4

4 Regular Pivot Seal Dimensions Dimensions are for reference only. Contact the factory for certified drawings for a particular model number. Ø Installation Clearance (Min) Factory Sealed Leads Color Coded & Marked min length 1/2 NPT(M) Electrical Connection Process Connection A Dimension 1, 5, 6, 9 Pistons 2 & /4 NPT(F) 157.2/ / /6.91 1/2 NPT(F) 170.4/ / /6.91 9/16 SAE(F) N/A 171.2/6.74 N/A 3/4 NPT(M) 180.3/7.10 N/A N/A 28.7 Hex 1.13 Weathertight Cover Screw * Flexible Seal Retainer External Ground Connection BG, BH & JH Housings Ø Process Connection ** Hex General Information for ATEX Certified Models Vacuum Designators Adjustable Range Overrange Proof psi bar psi bar psi bar to to to to to to to to to to to to to to to to to to to to to to Adjustable Range Vacuum 0 Overrange Proof in. Hg bar psi bar psi bar Designators Adjustable Range Overrange Proof psi bar psi bar psi bar to to to to to to , SOR Form 168 (04.05) Printed in USA

5 Designator AC Rating DC Rating Volts Amps Volts Amps Volts Amps AF & AG EF & EG JF & JG ATEX Marking Materials For ATEX Certified Models Manufacturer s Registered Trademark Thread Form Information Product Type Identification ATEX Listing Information Product Model Identification Serial Number (First Two Numbers Indicate Year of Manufacture) West 105th Street, Lenexa, Kansas Fax Page 4 of 4 Registered Quality System to ISO 9001