Aeros Instruments and Squire-Cogswell are both regular suppliers to the military and U. S. government.

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2 Squire-Cogswell/Aeros Instruments, Inc. Page 1 Squire-Cogswell/Aeros Instruments, Inc. was formed in 1916 as a supplier of railway and foundry equipment in Chicago. In 1951 the company was purchased by Walter F. Devereux and began to concentrate its efforts on a line of non-lubricated air compressors and vacuum pumps. A niche was found servicing the printing press industry with new and rebuilt pumps. Utilizing this expertise, the company began to supply custom pump packages for various applications. In the early 1950's, Squire-Cogswell/Aeros Instruments, Inc. sold its first hospital vacuum pump package, the cornerstone of today's business and product lines. In 1962 Herbert E. Schifter, Mr. Devereux's son-in-law, became president. The business then grew significantly as a supplier of custom designed and constructed vacuum and air compressor systems for medical and industrial use. To date, Squire-Cogswell/Aeros Instruments, Inc. has manufactured over 15,000 hospital pumping systems that have been installed literally around the world. Today, in the third generation of family ownership by Craig Schifter and his sister, Carol Lewis, the company continues to serve the worldwide needs of hospitals, laboratories, and industrial companies. Squire-Cogswell/Aeros Instruments, Inc. products are distributed through the company's direct sales force and through a network of dealers and distributors. Aeros Instruments, Inc. (now known as Squire-Cogswell/Aeros Instruments, Inc.) is an FDA registered, ISO certified, UL listed medical device manufacturer. Aeros was formed in 1962 as a wholly owned subsidiary of the Squire-Cogswell Company for the purpose of supplying suction equipment to the medical industry. Aeros now offers multiple models of electric and battery operated suction machines for hospitals, surgicenters, homecare, and EMS applications. Along with its own branded products, Aeros Instruments also manufactures and sells other devices for medical suction and medical gas regulation to other marketing companies on a private labeled, OEM basis. Primary to the Aeros Instruments product mix is the assembly and distribution of suction regulators and flowmeters for one of the largest sellers of such devices in the world. Aeros Instruments and Squire-Cogswell are both regular suppliers to the military and U. S. government. In the 1950's and 60's the companies were located in Chicago, Illinois. In 1969 we constructed a 48,000 square foot building and moved to Northbrook, Illinois. On December 1, 1993, Squire-Cogswell/Aeros Instruments, Inc. began operations in a brand new 84,000+ square foot corporate headquarters along Interstate 94 in Gurnee, Illinois, mid-way between Chicago and Milwaukee.

3 Page 2 To Order Call: SELECTION GUIDE ZERO CITY WATER USAGE Laboratory Air Compressor and Vacuum Pump Systems LABORATORY AIR COMPRESSOR SYSTEMS Single-Stage & Two-Stage Oil-Less Piston Air Compressor Systems are used for many applications generally installed in mechanical rooms at facilities. Most air pressure requirements are for 50 PSIG delivery pressure to facility s main air distribution line. For compressed air pressure requirements of 85 to 130 PSIG delivery pressure, Two-Stage Oil-Less Piston Air Compressors are suggested. Chilled water cooled compressed air after-coolers are available to reduce room heat load/temperature/possibly size of dryers. Air-Cooled and COMBINATION AIR-COOLED / CHILLED WATER COOLED AFTER-COOLER Air Compressor Systems are also available to accommodate particular situations. Oil-Less Scroll Air Compressor Systems are suggested when low noise level is needed close to occupied areas, low vibration is needed close to vibration sensitive instruments/occupied areas, and/or when needed for a small capacity unit at higher delivery pressures up to 130 PSIG. Air-cooled after-coolers are common. Chilled water cooled after-coolers are available to accommodate special situations. LABORATORY VACUUM PUMP SYSTEMS Oil-Sealed Liquid Ring Vacuum Pump Systems are one of the most reliable and low maintenance vacuum sources available. Systems sealed with 10 WT Food Grade Oil (or equivalent) containing anti-wear agents, anti-oxidents, and corrosion inhibitors are tolerant to many corrosive vapors/gasses. Chilled water cooled systems are suggested to reduce room heat load/temperature and to accurately control operating temperature at optimum level. Air-Cooled and COMBINATION AIR-COOLED / CHIILED WATER COOLED Systems are also available to accommodate particular needs. Single-Stage Liquid Ring Vacuum Pumps are used for maintaining design vacuum levels up to 19 to 21 HGV. Two-Stage Liquid Ring Vacuum Pumps should be considered for design vacuum levels greater than 22 HGV. Oil-Lubricated/Recirculated Single-Stage Rotary Vane Vacuum Pump Systems are used for general service when (as a rule) corrosive vapors/gasses and liquids are not present. These are not recommended for low vacuum applications. CHIILED WATER COOLED ASSIST OPTION is used to prolong pump life, extend maintenance intervals, and/or compensate for expected high equipment room temperatures/altitudes. Oil-Less Dry-Running Single-Stage Rotary Vane Vacuum Pump Systems are suggested for mildly corrosive vapors/gasses, and when low to medium vacuum levels are sufficient to service facility. NOTES: 1. GENERAL RULE OF THUMB SIZING CRITERIA FOR TYPICAL MEDIUM SIZED LABS: COMPRESSED AIR --- ¾ SCFM PER OUTLET WITH 50% USAGE FACTOR. VACUUM SCFM PER OUTLET WITH 50% USAGE FACTOR. Consult factory for other lab sizes and applications. 1. Determination of delivered pressure dew point of compressed air is important for optimal dryer selection. Other vacuum systems are available such as water sealed and recirculated LRVP systems for wet service. 2. CAPACITY SPECS - Air Systems in terms of PSIG & Vacuum Systems as HGV. For performance spec consistency and definition, suggest SCFM capacity basis of 14.7 PSIA, 68F, and 36% R. H. for compressors and HGA, 68F, and 50% R.H. for vacuum pumps. 1. Performance levels listed apply to standard barometer conditions. Consult factory for other conditions. 2. Systems meet latest edition of NFPA 99 for Lab Facilities and conform to National Electrical Code. 3. Standard motors are rated for room ambient temperatures up to 104F. 4. Factory (authorized) start-up assistance/in-service training are included in scope of supply. August 31, 2004

4 Squire-Cogswell/Aeros Instruments, Inc. Page 3 LIQUID COOLING IT S BTU-TIFUL! Remember that mechanical room that used to be 75 degrees back when there were only 3 pieces of equipment in the room? Chances are that, as the facility s equipment needs have grown, the ambient temperature of the room has grown right with it. It s well known that heat is a major enemy of mechanical equipment. The good news is that there are effective ways to deal with the problem. Even though all manufacturers of air cooled equipment provide adequate cooling for their own equipment, the cumulative effect of multiple units can have a detrimental effect on the performance and longevity of mechanical, electrical, and electronic components. The use of a facility s chilled water system can greatly assist in the reduction of local heat loads and the extension of component life. For example, on liquid ring vacuum systems the local heat load can be reduced by 25 to 30 BTU s/minute per HP through the use of chilled water. On oil sealed rotary vane systems the heat reduction can average 15 to 20 BTU s /minute per HP. And chilled water aftercoolers on oil-less piston compressors can help remove 15 BTU s /minute per HP. In the case of oil sealed rotary vane systems, the use of a small adapter and liquid to liquid heat exchanger represents an inexpensive addition with substantial benefits. Cooler operation translates into longer service intervals. It is estimated that, for every 15 to 18 degrees F above the maximum rated operating temperature of an oil in a rotary vane pump on clean service, the oil degradation rate doubles. To the extent that the pump is operating on less than clean service (often the case), the maximum operating temperature of the pump s oil will be reduced. Reduction of local heat loads also provides advantages to electrical components. Electric Motors Rule of Thumb is that each 18 degree F rise above the highest allowable stator winding temperature reduces the motor insulation useful life in half. Motor contactors inside electrical panels can also be adversely affected by excessive heat, especially due to short cycling of pumps. The use of minimum run timers and properly sized receivers will help prevent this condition. How much will this heat reduction cost in terms of chilled water? For removing 15 BTU s/minute from either an air compressor or vacuum pump system, the additional load is about chiller HP for water-cooled chillers (via cooling towers) and about 0.10 chiller HP for air cooled chillers. The use of chilled water on the systems described can help reduce the air temperature around the systems by 7 to 20 degrees F, depending on type of system. Temperature reduction is based on access space of 2 to 3 feet around systems and ceiling height of 12 feet. Selection Guide / Liquid Cooling

5 Page 4 To Order Call: PRINCIPLE OF OPERATION LIQUID RING VACUUM PUMPS Figure 1 shows a cross section of a liquid ring vacuum pump. The impeller is cylindrical in shape with a multitude of fins and is located eccentrically in the impeller housing which is partially filled with the sealing liquid, either water or oil. A port plate with suction and discharge openings is located on each side of the impeller cell. As the impeller rotates, the centrifugal force pushes the sealing liquid outward where it forms a liquid ring which follows the contour of the impeller housing. Starting at point "A" the impeller cell is completely filled with the sealing liquid. As the impeller advances, the liquid in the cell recedes and creates a vacuum in the empty space, which draws in the air or gas through the suction port. Continued rotation increases the gas volume in the impeller cell until the end of the suction cycle at point "B". From point "B", the liquid is gradually forced back into the impeller cell, compressing the gas to near atmosphere, until at point "C" the compressed gas is expelled through the discharge port together with a portion of the sealing liquid. The complete cycle can be compared with a piston in a cylinder where the piston is the liquid ring and the impeller cell is the cylinder. The heat generated by the pump during the compression cycle is dissipated into the sealing liquid. The discharged sealing liquid is recirculated back from the separator tank to the pump on Partial Recirculating Systems. Any fresh make-up seal liquid is controlled by the liquid temperature and level switches, reducing consumption of fresh water. Total Recirculating Systems are available in either water sealed or oil sealed configurations, utilizing a heat exchanger, and eliminating the requirement for fresh make-up seal liquid. The heat exchanger removes the heat from the seal liquid before it is re-introduced into the pump. A C B Figure 1

6 Squire-Cogswell/Aeros Instruments, Inc. Page 5 Liquid Ring Vacuum Systems Water Sealed Water Miser or Total Recirculation Food Grade Oil Sealed Chilled Water Cooled or Air Cooled U.L. Listed Electrical Control panel Available in Simplex, Duplex, Triplex or Quad Configurations: Tank, Base or Stack Mounted Partial Recirculation runs without any make-up water for 48 hours Medical or Laboratory Applications Minimal maintenance, Maximum Durability No contacting parts in pumping chamber Cool running and long wear Optional Heat Exchanger shown on chart on page 6 Warranty: 2/24 Months Single Stage Two Stage Model No HP 19" HGV 25" HGV Model No HP 19" HGV 25" HGV SM LC SM C SM C SM C SM C SL C SL C B C B A B A B Liquid Ring Vacuum Systems

7 Page 6 To Order Call: TOTAL RECIRCULATION OF SEALING LIQUID CUSTOMER'S COOLING FACILITIES (CHILLER, COOLING TOWER, ETC.) VACUUM INLET GAS DISCHARGE VACUUM PUMP GAS/LIQUID SEPARATOR LIQUID LEVEL SWITCH FRESH LIQUID MAKE-UP LINE HEAT EXCHANGER COOLANT OUT OVERFLOW HEAT EXCHANGER COOLANT IN TEMPERATURE SWITCH HEAT EXCHANGER RECIRCULATION LINE FRESH LIQUID MAKE-UP LINE RECIRCULATION LINE DISCHARGE GAS AND LIQUID TO SEPARATOR GAS DISCHARGE VACUUM INLET LINE HEAT EXCHANGER COOLANT INLET LINE HEAT EXCHANGER COOLANT OUTLET LINE PARTIAL RECIRCULATION OF SEALING LIQUID VACUUM INLET GAS DISCHARGE VACUUM PUMP GAS/LIQUID SEPARATOR LIQUID LEVEL SWITCH FRESH LIQUID MAKE-UP LINE OVERFLOW TEMPERATURE SWITCH RECIRCULATION LINE

8 Squire-Cogswell/Aeros Instruments, Inc. Page 7 Quick Selection Chart for Food Grade Oil Sealant Liquid Ring Vacuum Systems: HP Per Pump Model 19" Hg 25" Hg 3 SM30-OA SM40-OA SM55-OA SM75-OA SM75-OL SM100-OA SM100-OL SL150-OA SL150-OL SL200-OA SL200-OL B-OA B-OL B-OA B-OL B-OA B-OL B-OA B-OL LC-OA LC-OL C-OA C-OL C-OA C-OL C-OA C-OL C-OA C-OL C-OA C-OL C-OA C-OL C-OA Overall Length Overall Width Overall Height Please contact Squire-Cogswell/Aeros for dimensional information at Models SM30 thru 175B are single stage pumps Models 27LC thru 275A are two-stage pumps Reciorc of Sealing Fluid / Quick Selection Chart C-OL A-OA A-OL A-OA SM100 OL Pump Model/Horsepower OA = Food Grade Oil Sealed, Air Cooled OL = Food Grade Oil Sealed, Chilled Water Cooled A-OL

9 Page 8 To Order Call: Quick Selection Chart for Water Sealed Liquid Ring Vacuum Systems: HP Per Pump Model 19" Hg 25" Hg Average Cooling Fluid Required (GPM) Overall Length Overall Width Overall Height 3 SM30-PR SM30-WL SM30-PR-T SM30-WL-T SM40-PR SM40-WL SM40-PR-T SM40-WL-T LC-MB LC-PR LC-WL SM55-PR SM55-WL SM55-PR-T SM55-WL-T SM75-PR SM75-WL SM75-PR-T SM75-WL-T C-MB C-PR C-WL C-MB C-PR C-WL SM100-PR SM100-WL SM100-PR-T SM100-WL-T C-MB C-PR C-WL C SL150-PR SL SL150-WL C-MB C-PR C-WL C Please contact Squire-Cogswell for dimensional information at

10 Squire-Cogswell/Aeros Instruments, Inc. Page 9 HP Per Pump Model 19" Hg 25" Hg Average Cooling Fluid Required (GPM) Overall Length Overall Width Overall Height C-MB C-PR C-WL C SL200-PR SL SL200-WL B-PR B B-WL C-MB C-PR C-WL C C-MB C-PR C-WL C A-MB A-PR A-WL A B-PR B B-WL B-PR B B-WL A-MB A-PR A-WL A B-PR B B-WL Please contact Squire-Cogswell/Aeros for dimensional information at Quick Selection Models SM30 thru 175B are single stage pumps Models 27LC thru 275A are two-stage pumps SL150 WL Pump Model/Horsepower Also available in Base or Stack Mounted Systems PR = Water Sealed, Partial Recirculation, Liquid Cooled WL =Water Sealed, Total Recirculation, Liquid Cooled MB - Pump, Motor, Base T2 = Duplex Tank Mounted

11 Page 10 To Order Call: PRINCIPLE OF OPERATION ROTARY VANE VACUUM PUMPS The SelecTORR vacuum pump operates as follows: The rotor is mounted on the drive shaft and positioned eccentrically in the cylindrical casing. The rotor has slots for radially sliding vanes, which divide the pump chamber into segments. The centrifugal force of rotation pushes the vanes out of these slots and toward the wall of the casing. As the rotor turns, the gas is drawn through the inlet, compressed and pushed out through the exhaust. In lubricated vacuum pumps, the lubricating oil collects in the bottom of the exhaust oil separator chamber as the gas passes through a demister, then through an exhaust filter, before finally exhausting to the atmosphere. Vanes Rotor Discharge Casing Inlet Dry rotary vane vacuum pumps do not use lubricating oil. Typical Vacuum System FROM DISTRIBUTION PIPING VACUUM SWITCH AND GAUGE FLEXIBLE CONNECTOR ISOLATION VALVE(S) DISCHARGE TO OUTSIDE MAINLINE ISOLATION VALVE AIR RECEIVER MANUAL DRAIN VACUUM PUMPS

12 Squire-Cogswell/Aeros Instruments, Inc. Page 11 Rotary Vane Vacuum Systems Continuous on demand Lubricated oil recirculated or dry running Available in Simplex, Duplex, Triplex or Quad Configurations: Tank Mounted: Up to 10 Hp Base or Stack Mounted: Up to 25 Hp Warranty: 12/24 Months Oil sealed system feature synthetic oil, reducing maintenance and oil changes U.L. Listed Electrical Control Panel Available Lubricated Models Dry Running Models Model 25" HGV Model Hp No. HP 19" HGV (S / SD) No. HP 19" HGV I /2.3 ID I /3.5 ID I300L /5.1 ID I /7.3 ID I500L ID500L I /19.7 ID I /27.3 ID I /32.3 ID I Maximum Vacuum: I ,2 & 10 Hp 25" HGV I / & 5 Hp 27" HGV Maximum Vacuum: 7.5 Hp.. 22" HGV S' Style Pumps 29.1" HGV 'SD' Style Pumps 29.9" HGV Rotary Vane Vacuum Systems

13 Page 12 To Order Call: Quick Selection Chart for Oil Lubricated Rotary Vane Vacuum Systems 25" HP per Pump Total Hp Mode l 19" Hg each Hg each ( S / SD ) Re ceiver Size Overall Length Overall Width Overall Height 1 1 I100TR-T / I100TR-T1V / I100TR-T / I100TR-T2V / I200TR-T / I200TR-T1V / I200TR-T / I200TR-T2V / I300TRL-T / I300TRL-T1V / I300TRL-T / I300TRL-T2V / I300TRL-ST / / I300TR-T / I300TR4-T1V / I300TR-T / I300TR-T2V / I300TR-ST / / I500TRL-T I500TRL-T1V I500TRL-T I500TRL-T2V I500TRL-ST / I500TRL-ST I500TRL-ST I500TR-T / I500TR-T1V / I500TR-T / I500TR-T2V / I500TR-ST / / I500TR-ST / I500TR-ST / I750TR-T / I750TR-T1V / I750TR-T / I750TR-ST / / I750TR-ST / I750TR-ST /

14 Squire-Cogswell/Aeros Instruments, Inc. Page 13 25" HP per Pump Total Hp Mode l 19" Hg each Hg each ( S / SD ) Re ceiver Size Overall Length Overall Width Overall Height I1000TR-T / I1000TR-T1V / I1000TR-T / I1000TR-ST / / I1000TR-ST / I1000TR-ST / I1500TR-ST I1500TR-ST I1500TR-ST I2000TR-ST I2000TR-ST I2000TR-ST I2500TR-ST / I2500TR-ST / I2500TR-ST / Quick Selection Chart for Dry Running Rotary Vane Vacuum System HP per Pum p I T 1 V Vertical Tank 1 = Simplex 2 = Duplex Tank 3 = Triplex STack 4 = Quadruplex Horsepower (Example: 100 = 1.0 Hp) Industrial SelecTORR Series Rotary Vane Vacuum Pump Total Hp Model 19" Hg 25" Hg Receiver Size (Gallons) Overall Length Overall Width 1 2 ID100-T ID100-T2V ID150-T ID150-T2V Overall Height Quick Selection Chart 3 4 ID200-T ID200-T2V ID300-T ID300-T2V ID500L-T ID500L-T2V ID500-T ID500-T2V ID750-T ID1000-T ID T 2 V Vertical Tank 2 = Duplex Tank Horsepower (Example: 100 = 1.0 Hp) Industrial Dry Running Vacuum Pump

15 Page 14 To Order Call: OIL-LESS RECIPROCATING PISTON AIR COMPRESSORS PRINCIPLE OF OPERATION With the down stroke of the piston, air is drawn through an intake valve in the head of the compressor and into the cylinder. At the bottom of the stroke the intake valve closes and air is trapped in the cylinder. The air is then compressed in the cylinder and pushed through the discharge valve on the up stroke of the piston. Total compression, from atmospheric pressure to the final discharge pressure, is accomplished in one stroke of the piston. Typical Air System INTAKE FROM OUTSIDE ISOLATION VALVE(S) TO DISTRIBUTION PIPING PRESSURE SWITCH AND GAUGE PRESSURE RELIEF VALVE MAINLINE ISOLATION VALVE FLEXIBLE CONNECTOR RELIEF VALVES DRYER 1 AIR RECEIVER DRYER 2 AIR SAMPLING VALVE FILTER COMPRESSORS AFTER COOLERS AUTOMATIC DRAIN DEW POINT AND CARBON MONOXIDE MONITORS DUPLEX FILTER/REGULATOR BANK

16 Squire-Cogswell/Aeros Instruments, Inc. Page 15 Oil-Less Reciprocating Compressed Air Systems Single Stage and Two Stage Oil-Less Piston Air Compressor NFPA 99, 2002 compliant U.L. Listed Electrical Control panel Available in Simplex, Duplex, Triplex and Quadruplex Configurations: Tank, Base or Stack Mounted Medical, Laboratory and Instrument Air Warranty: 12/24 months Air Systems with Two-Stage Compressors Air Systems with Single-Stage Compressors Compressed Air Systems Model # HP 100 PSIG 125 PSIG 150 PSIG A500QT A750QT A1000QT A1500QT A2000QT A2500QT A3000QT Model # HP 50 PSIG 100 PSIG A200Q A300Q A500Q A750Q A1000Q A1500Q A2000Q A2500Q A3000Q

17 Page 16 To Order Call: Quick Selection Chart for Oil-Less Single Stage Reciprocating Compressed Air Systems HP Per Pump Total HP Model 50 PSIG 100 PSIG Re ceiver Size (Gallons) Overall Length Overall Width Overall Height 2 2 IA200Q-T IA200Q-T IA300Q-T IA300Q-T IA500Q-T IA500Q-T IA750Q-T IA750Q-B / IA750Q-T IA750Q-ST / IA750Q-B / IA750Q-ST / IA750Q-ST IA1000Q-T IA1000Q-T IA1000Q-B / IA1000Q-ST / IA1000Q-B / IA1000Q-ST / IA1000Q-ST IA1500Q-T IA1500Q-B / IA1500Q-ST / IA1500Q-B / IA1500Q-ST IA1500Q-ST IA2000Q-B / IA2000Q-ST / IA2000Q-B / IA2000Q-ST IA2000Q-ST IA2500Q-B / IA2500Q-B / IA3000Q-B / IA3000Q-B / IA 2000Q - ST 2 1 = Simplex 2 = Duplex Tank 3 = Triplex Base 4 = Quadruplex STack Horsepower (Example: 2000 = 20 Hp) Industrial Compressed Air System

18 Squire-Cogswell/Aeros Instruments, Inc. Page 17 Quick Selection Chart for Oil-Less Two- Stage Reciprocating Compressed Air Systems HP Per Pum p Total Re ceiver Size Overall Length Overall Width HP Model 100 PSIG 125 PSIG 150 PSIG (Gallons) 5 5 IA500QT-T IA500QT-T IA750QT-T IA750QT-B / IA750QT-T IA750QT-B / IA750QT-ST / IA750QT-ST / IA750QT-ST IA1000QT-T IA1000QT-T IA1000QT-B / IA1000QT-B / IA1000QT-ST / IA1000QT-ST / IA1000QT-ST IA1500QT-T IA1500QT-B / IA1500QT-ST / IA1500QT-B / IA1500QT-ST IA1500QT-ST IA2000QT-B IA2000QT-ST IA2000QT-B IA2000QT-ST IA2000QT-ST IA2500QT-B IA2500QT-B IA3000QT-B IA3000QT-B Overall Height Please contact Squire-Cogswell/ Aeros for dimensional information at Quick Selection Chart IA 750Q T - ST 2 1 = Simplex 2 = Duplex Tank 3 = Triplex Base 4 = Quadruplex STack Two-Stage Compressor Horsepower (Example: 750 = 7.5 Hp) Industrial Compressed Air System

19 Page 18 To Order Call: Oil-Less Scroll Air Compressor Systems Continuous On Demand medical air compressor systems consisting of oil-less rotary scroll compressors, with a vertical receiver and U.L. listed electrical control panel. System meets the latest NFPA 99 standard. Included are ODP motors, high air temperature switches, check valves, pump isolation valve and interconnecting copper piping, dual desiccant dryers, CO and dewpoint monitor. Accessories (shipped separate for field installation) are inlet and discharge flexible connectors, vibration mounting pads, source isolation valve and line pressure relief valve. SCFM System ICFM System SCFM per SCFM per Design Design System HP per No. of Model # Module 50 PSIG 100 to 116 PSIG Pumps 50 PSIG 50 PSIG Duplex MSD MSD MSD MST MSD MSD15-120CS Triplex MST10-200CS MST15-200CS Quadruplex MSQ10-200CS MSQ15-200CS

20 Squire-Cogswell/Aeros Instruments, Inc. Page 19 Quick Selection Chart for Oil-less Scroll Air Compressor Systems HP Per Pump Total HP Model SCFM System De sign 50 PSIG ICFM System Des ign 50 PSIG Receiver Size (Gallons) Overall Length Overall Width Overall He ight System Weight (Lbs.) 2 4 MSD MSD MSD MST MSD MSD15-120CS MST10-200CS MST15-200CS MSQ10-200CS MSQ15-200CS MS D Horsepower D = Duplex T = Triplex Q = Quadruplex Scroll Air Compressor Receiver Size Scroll Air Systems

21 Page 20 To Order Call: Refrigerated Air Dryers Principal of Operation Compressed air enters the air-to refrigerant heat exchanger (A) where it is cooled by the refrigeration system to the desired dew point temperature. As the air is cooled in the heat exchanger, water vapor condenses into liquid droplets. The air and entrained water droplets then enter the separator (B) where liquid water droplets are removed from the air stream. An automatic drain (C) discharges the collected water from the system. As long as the temperature of the compressed air does not fall below the dew point temperature produced in the dryer, the remaining water vapor will not condense into troublesome liquid in downstream air lines. This dryer fully meets the NFPA 99 requirements for 32 F. Desiccant Air Dryers Principal of Operation A single desiccant dryer consists of two towers, primary and secondary and a instrument panel. This dryer fully meets the NFPA 99 requirement for 32 F. Compressed air enters the bottom of the desiccant dryer where the switching valve directs the compressed air to the primary tower. The up flow drying allows water and heavy contaminates to drop out of the air stream as they enter the tower protecting the desiccant bed from contamination. The air is dried in the tower and directed through a series of check valves and discharged through the outlet. Primary Tower (DRYING) Purge Valve Secondary Tower (REGENERATING) A portion of the dried air is diverted through an adjustable purge valve where it is throttled to near atmospheric pressure and the secondary tower. This dried low-pressure air is called purge air, which regenerates the desiccant in the secondary tower by carrying off the water collected. The purge air is then exhausted to atmosphere through the purge valve and muffler. After regeneration, the purge valve closes and the secondary tower depressurized to line pressure. Inlet Switching Valve Air Inlet Purge Valve An inlet switching valve on the secondary tower then opens and the inlet switch valve on the primary tower closes and the purge valve on the primary tower is opened. The inlet air is now being dried in the secondary tower while the primary tower is being regenerated.

22 Squire-Cogswell/Aeros Instruments, Inc. Page 21 OTHER LABORATORY SUPPORT EQUIPMENT Manifolds -Fully Automatic, High Pressure H 12.8 W See Spacing Right 5 Deep Fully Automatic N2O, CO2, N2, Air Compact Design U.L.. Listed, NFPA 99, 2002 Compliant Liquid Systems Available Cylinder Spacing Cylinders Without Heaters With Heaters 2x2 49" 63.5" 4X4 69" 83.5" 6X6 89" 103.5" 8x8 109" 123.5" 10x10 129" 143.5" 12x12 149" 163.5" N2O/CO2 Manifolds include heaters Other Laboratory Support Equipment Other Equipment Available: Protocol Stations for Single Cylinder High Pressure Gas in Brass or Stainless Steel Construction Semi-Automatic High Pressure Gas Manifolds in Brass or Stainless Steel Construction Compact Design High Pressure Gas Manifold Configurations for tight spaces

23 Page 22 To Order Call: Zone Valve Boxes FREATURES: Up to 5 valves in single, large boxc Full Port Design Blow-Out proof stem Cleaned for medical gas service Teflon seats Gauge port on pipe extension without cover with cover Locking and Non-Locking Valves with extensions Locking Valve Full port design Blow-out proof stem Sized range of 1/2 (13mm) to 4 (102mm) Cleaned for mdical gas service Teflon seats 1/2 through 3 - Dual gauge ports on pipe extensions 4 - Single gauge port on pipe extension Available: Locking and Non-Locking Non-Locking Valve

24 Squire-Cogswell/Aeros Instruments, Inc. Page 23 Alarms: Combination, Area and Master Combination Alarm: With local or remove sensors High Visibility LED readouts Adjustable audible alarm repeat (from 1 to 99 minutes) Can be interfaced with LonWorks Knockout for conduit installation UL and CSA listed The combination alarms are capable to monitor from 1 to 4 gases and 10 to 20 points in a standard box, or 1 to 8 gases and 10 to 40 points in a large box. Area Alarms: Can be equipped with local or remote sensors High Visibility LED readouts 6 gas or 8 gas UL Listed Test and Silence/Reset Button Other Laboratory Support Equipment Master Alarm: Up to 30 or 50 Points High Visibility LED readouts Circuitry allows for Normally open or Normally closed Adjustable audible alarm repeat (fro 1 to 99 minutes) UL Listed

25 Page 24 To Order Call: Vacuum Regulator The reliable AVR vacuum regulator is well suited to a variety of OEM Applications. The anodized aluminum body and diaphragm assure accuracy and reliability. All connections (inlet, outlet and gauge) are 1/8 N.P.T. Suitable for panel mounting. Knob rotates clockwise to increase vacuum level. Regulates from 0 to 20 Hg. Flow range up to 70 liters per minute. Available with optional gauge (shown). Pressure/Vacuum Switch FEATURES NEMA 4 water tight enclosure. Tamper-proof external adjustment. Normally open or normally closed contacts. Snap-action switching elements. High/Low pressure switches for oxygen, nitrous oxide, medical air, carbon dioxide, etc. The pressure switch shall incorporate Underwriters Laboratories Inc. listed single pole double throw snap action switching elements. The switch shall be in a Nema 4 water-tight housing and have an adjustable range of 3.90 to 80 psig and have approximate actuation value (differential) of 1.60 to 3.40 psig. The switch shall be oxygen cleaned, and have a continuous inductive rating of 10 amps 125 or 250 volts AC, 3 amps 480 volt AC. The switch may be wired normally open or normally closed ; has a 1/4 NPTF connection, and will be fitted with a quick connect to facilitate field service and testing. Vacuum switch for vacuum service, The vacuum switch shall incorporate Underwriters Laboratories Inc. listed single pole double throw snap action switching elements. The switch shall be in a Nema 4 water-tight housing and have an adjustable range of 1.60 to 30.0 inches Hg (gauge) and have approximate actuation value (differential) of 0.40 to 0.80 inches Hg (gauge). The switch shall have a continuous inductive rating of 10 amps 125 or 250 volts AC, 3 amps 480 volts AC. The switch may be wired normally open or normally closed ; has a 1/4 NPTF connection, and will be fitted with a quick connect to facilitate field service and testing.

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