Keller USA, Inc.54 Great Hill Road, P.O. Box 546Naugatuck, CT 06770 USAPhone (203) 729-0145 . Fax (203) 729-0148E-mail: info@kellerusa.comwww.kellerusa.com

REFERENCE INSTALLATIONS

AIR FILTRATIONSYSTEM SOLUTIONS

AIR FILTRATIONSYSTEM SOLUTIONS

VARIO – SEPARATION OF FINE DUST PARTICLES

THE TASK

Keller plans, engineers, and manufactures air pollution controlsystems for the capture, removal and separation of airborneparticles for all types of industry. High filtration efficiency isachieved with the use of innovative filtration technology andefficient design. Suitable exhaust systems offer solutions toindividual problems at high levels of quality.

The VARIO series is particularly suitable for the separation offine dust. Nearly all types of dust can be successfully separated, such as those created in metal processing, polymerprocessing, and in chemical, pharmaceutical and ceramic industries, as well as non-metallic minerals.

The VARIO units are modular construction in order to meetdifferent requirements, such as dust characteristics or thevolume of exhausted air. Sturdy and low-noise units allow forreliable 24-hr. operation with constant air flow. Short deliverytimes and competitive pricing are possible because of seriesproduction planning.

SCOPE OF APPLICATIONS

Machining processes: – lathing, drilling, milling, grinding– removing bulk waste– blending, fusing– measuring– manufacturingThermal processes: – laser cutting/etching– welding

VARIO 6.2, durable, heavy-duty assembly

VARIO 6, for welding fume exhaust

2

ADVANTAGES– high-quality filter element

– compact construction

– large filter area

– low filter resistance

– integrated sound insulation

OPERATION

The dust-laden air flows through the dirty air inlet into the filter unit. A baffle plate slows down and deflects the dustparticles to protect the filter elements from direct impact. Anair down-flow is created between the filter elements, allowingthe dust particles to drop. A fan in the clean air chamberdraws the polluted air through the filter elements, depositingthe dust particles onto the filter surface. Because the filterelements are cleaned continuously by compressed air pulsesduring operation, the air flow remains constant. The cleanedair exits through the top of the unit and in most cases can bere-circulated into the work area or vented outdoors. The separated dust falls into the dust collector containers.

FILTER ELEMENTS

The SINBRAN filter elements, a combination of sintered polyethylene and laminated GORETM-membran, combine theadvantage of membrane filtration (low pressure loss with highfiltration efficiency) with a long-life rigid frame construction.These elements are reusable, have “BGIA” test certificationaccording to DIN EN 6035-2-69 Appendix AA (08/99) and meetthe requirements of dust class "M", formerly known as categories U, S, G and C. Alternative filter elements such ascartridge filters, multitube and Y-filters are also available.

CLEANING THE FILTER ELEMENTS

The pulse cleaning cycle can be adjusted for each applicationby means of an integrated control unit. The air flow of the fanremains nearly constant. The cleaning operation is activatedeither by a differential pressure regulator while in operation,or by a programmable downtime cleaning cycle.

WASTE DISPOSAL

The air-tight and dust-tight disposal bins are connected to thefilter's hopper with a clamping device, simplifying the exchange of dust collector containers.

The reusable bins can be directly discharged with the use of aclosed lid and clamping ring. For large dust quantities orduring 24-hour operation, continuous disposal is accomplishedby means of an air lock.

VARIO 2, exhaust system for dust created by grinding and polishing processes

accessories

114

64

116

110

120

115

50

104

ACCESSORIES FOR VARIO UNITS

Access.ref. Designation Description

50 Connecting elbow to connect ductwork for dirty air and clean air openings

64 Compressed air regulator integrated oil and condensation separator with automatic drain and pressure reducer bymanometer

104 Injector device IN compressed air operated suction vacuum to keep the workstation tidy as well as clean thework pieces and machines. Connected to the separator (please request the special information sheet)

110 Additional silencer to reduce the noise level by about 5 dB(A)

114 Shed with sound-insulating lining

for outdoor installation. Reduces the discharge noise by about 4 dB(A).

115 Vibration damper four rubber-metal elements for the substructure, to prevent the transfer of vibrations to buildings or foundations

116 Stepladder with railing facilitates inspection and maintenance work

120 Electrical differentialpressure measuring gauge

steady measurement of filter resistance and triggers the compressed air pulses to clean thefilter elements as needed (when the resistance exceeds the preset limit value)

11

14

12

68

16

11

15

12

13

9

3

4

FEATURES OF THE VARIO P 4

Unit type VARIO P4-10 VARIO P4-12

filter elements cartridge 327/985 327/985amount pcs. 10 12

motor1) output kW 15,0 18,5valves2) amount pcs. 5 6compressed air3) consumption L/min 19 19sound level4) dB(A) 76 76weights standard unit kg 1900 1980

model A kg 1640 1720model Z/F kg 1890 2070

subject to modifications1) Voltage 400 Volt/50 Hz, speed 3000 min -1.2) Nominal width 2”, voltage 24 Volt DC.3) Nominal pressure 4 - 5 bar. Consumption litre in normal

conditions if the pulse pause between the pulses is 250 - 400 s. These are estimated values and can differ depending on dust quantity and quality.

4) Measured in 1 m distance in front of the unit (door). Measured according to DIN EN ISO 3744, freefield conditions.

DIAGRAM AND DESCRIPTION OF VARIO P 4 - 6

1 dirty air inlet; on optional sides of the unit2 baffle plate; at the dirty air inlet3 filter elements4 clamping mechanism for disposal bin5 waste disposal bin6 jet piping to clean the filter elements7 compressed air connection for VARIO P 4 - 6

with 1" nozzle 8 compressed air tank9 diaphragm valves; electromagnetic10 terminal box11 clean air outlet; pipe connection possible12 support frame13 hopper14 filter housing without waste disposal device15 motor with three built-in temperature probes

(for motor protection)16 radial fan

103

VENTING OUTDOORS OR RE-CIRCULATION

Air recirculation is often possible with the use of high-qualitySINBRAN filter elements. The cleaned air can be ducted andchanneled (even with heat exchangers) to the outdoors, or re-circulated back into the workplace. Alternate venting orrecirculation can be accomplished by activating a switch within the exhaust duct.

We will be pleased to furnish you with detailed informationregarding the feasibility of a recirculation system, ensuringcompliance with your local rules and regulations.

PLACEMENT

The VARIO filter unit is meant for indoor use, adjacent to thedevice to be exhausted. Outdoor installation is possible, provided certain protective measures are adopted.

SAFETY

The VARIO filter unit can be equipped with additional safetyprecautions when processing combustible or explosive dusts.

FAN SECTION

The direct-drive radial fan is very silent. Depending on thesize of the filter unit, the fan is either integrated, top-mountedor placed next to it.

Two VARIO 6; exhaust systems for dust created by spring steel grinding processes

VARIO 3

VARIO 4

4

The VARIO is available in different sizes and designs.Calculating the air flow to be exhausted (m³/hr) is essential forselecting the right unit.Different variations are available.

VARIO UNIT TYPES

2630

1125

700 602

412

Ø 315

Ø 25080

0

1000

1855

3655

700

3655

1150

675

780Ø 560

Ø 500

1540

1100

1350

1350

3860

1100

2760

4960

700

4960

1150

900

2630

1235

1050

1350

Ø 400

Ø 450

515

2300

4555

700

4555

1150

VARIO 2, basic unit and variations A, Z, F

VARIO 1, basic unit and variations A, Z, F

VARIO 3, basic unit and variations A, Z, F

1420x470

1510

560

3080

1540

1300

1800

3490

1420x470

560

3410

700

3080

1800

1540

5390

2190

3200

VARIO 6 basic unit H VARIO 6 variation Z-H

Unit type VARIO 4 VARIO 5 VARIO 64.1 4.2 4.3 5.1-H 5.2-H 6.1-H 6.2-H 6.3-H

filter elements SINBRAN, Multitube, Y-Filter 1500/18 1500/ 18 1500/ 18amount pcs. 16 18 20 24 28 32 36 40

motor1) output kW 15 18,5 22,0 - - - - -valves2) amount pcs. 8 9 10 12 14 16 18 20compressed air3) consumption l/min 250 350 500sound level4) dB(A) 76 - -weights standard unit kg 1830 1980 2120 2340 2420 3040 3110 3190

model A kg 1570 1720 1860 - - - - -model Z-H (F-H) kg 1920 2070 2210 2350 2430 3050 3160 3200

subject to modifications

9

VARIO 4 variation Z with top mounted fan

5450

400

2190

2410

4600

1540

700

1540

710

261040

0

710

1540

2190

1300

1420x470

400

710

1540

2190

1300

VARIO 4 basic unit

COMPACT DESIGN, HIGH FILTRATION EFFICIENCY - SERIES VARIO 4 - 6

2400

1540

470

1260

1540

1040

3300

1420x470

VARIO 5 basic unit H VARIO 5 variation Z-H

5260

2260

3000

2400

700

1540

1420x470

1420

3220

470

VARIO 4 basic unit with top mounted fan

8 5

FEATURES OF THE VARIO 1 - 3

VARIO 1-3

VARIO 1-3 series

DIAGRAM AND DESCRIPTION OF VARIO 1 - 3

1 dirty air inlet; on optional sides of the unit2 baffle plate; at the dirty air inlet3 filter elements4 waste disposal bin5 clamping mechanism for disposal bin6 jet piping to clean the filter elements7 suction nozzle8 fan impeller; directly coupled with the motor9 radial fan10 compressed air tank11 diaphragm valves; electromagnetic12 motor with three built-in temperature probes

(for motor protection)13 sound-absorbing lining14 compressed air connection for VARIO 1 - 3 with ½" fitting15 clean air outlet; pipe connection possible 16 door to access the filter housing17 electrical switch control cabinet or terminal box18 safety device against fall19 filter housing without waste disposal device20 connecting frame21 rotary valve22 support frame23 hopper24 electrical connection

14

11

10

6

3

4

5

15

1213

987

1

2

15

16

4

17

1819, 20

17

21

14, 24

23

22

Unit Type VARIO 1 VARIO 2 VARIO 31.1 1.2 1.3 2.1 2.2 2.3 3.2 3.3

filter elements SINBRAN, multitube, Y-Filter 900/ 12 1200/ 18 1500/ 18amount pcs. 4 6 8 8 10 12 12 14

motor1) output kW 3,3 3,3 3,3 5,5 7,5 11,0 12,5 15,0valves2) amount pcs. 2 3 4 4 5 6 6 7compressed air3) consumption l/min 20 30 40sound level4) dB(A) 72 75 75weights basic unit kg 640 660 680 1040 1070 1110 1660 1700

variation A kg 550 570 590 870 890 910 1390 1430variation Z/F kg 650 670 690 1050 1080 1120 1670 1710

1) voltage 400 V/50 Hz; speed 3000 r.p.m.2) nominal width 2 inches; 24 Volt DC3) nominal pressure 6 bar; consumption in litres under normal operating conditions,

if the pause between pulses is 3 minutes

4) measured at a distance of 1 m from the unit (door); measured according to DIN EN ISO 3744, field conditions

subject to modifications

6

DIAGRAM AND DESCRIPTION VARIO P 1 - 3

1 dirty air inlet; on optional sides of the unit2 baffle plate; at the dirty air inlet3 filter elements4 waste disposal bin5 clamping mechanism for disposal bin6 jet piping to clean the filter elements7 suction nozzle8 fan impeller; directly coupled with the motor9 radial fan10 compressed air tank11 diaphragm valves; electromagnetic12 motor with three built-in temperature probes

(for motor protection)13 sound-absorbing lining14 compressed air connection for VARIO 1 - 3 with ½" fitting15 clean air outlet; pipe connection possible

VARIO P 1 - 3 FEATURES

Unit type VARIO P1 VARIO P2 VARIO P3

filter elements cartridge 327/600 327/985 327/985amount pcs. 4 6 8

motor1) output kW 3,3 7,5 12,5valves2) amount pcs. 2 3 4compressed air3) consumption L/min 6 9 12sound level4) dB(A) 72 75 75weights basic unit kg 680 1110 1700

variation A kg 550 870 1390variation Z/F kg 650 1050 1670

1) Voltage 400 Volt/50 Hz, speed 3000 min -1.2) Nominal width 2”, voltage 24 Volt DC.3) Nominal pressure 4 - 5 bar. Consumption litre in normal

conditions if the pulse pause between the pulses is 250 - 400 s. These are estimated values and can differ depending on dust quantity and quality.

4) Measured in 1 m distance in front of the unit (door). Measured according to DIN EN ISO 3744, freefield conditions.

subject to modifiations

7

DIAGRAM AND DESCRIPTION OF VARIO 4 - 6

1 dirty air inlet; on optional sides of the unit2 baffle plate; at the dirty air inlet3 filter elements4 clamping mechanism for disposal bin5 waste disposal bin6 jet piping to clean the filter elements7 compressed air connection for VARIO 4 - 6 with 1" nozzle 8 compressed air tank9 diaphragm valves; electromagnetic10 terminal box11 clean air outlet; pipe connection possible12 support frame13 hopper14 filter housing without waste disposal device15 motor with three built-in temperature probes

(for motor protection)16 radial fan

9

87

3

4

5

10

11

6

12

12

VARIO 4-6 variation H

11

16

15

10

6

12

13

12

8

7

14

VARIO 4-6 with top mounted fan

COMPACT DESIGN, HIGH FILTRATION EFFICIENCY - SERIES VARIO 4 - 6

1) voltage 400 V/50 Hz; speed 3000 r.p.m.2) nominal width 2 inches; 24 Volt DC3) nominal pressure 6 bar; consumption in litres under normal

operating conditions, if the pause between pulses is 30 seconds4) measured at a distance of 1 m from the unit (door); with

connected suction and discharge ductworks, measured accordingto DIN EN ISO 3744, field conditions.

Unit type VARIO 4 VARIO 5 VARIO 64.1 4.2 4.3 5.1-H 5.2-H 6.1-H 6.2-H 6.3-H

filter elements SINBRAN, Multitube, Y-Filter 1500/18 1500/ 18 1500/ 18amount pcs. 16 18 20 24 28 32 36 40

motor1) output kW 15 18,5 22,0 - - - - -valves2) amount pcs. 8 9 10 12 14 16 18 20compressed air3) consumption l/min 250 350 500sound level4) dB(A) 76 - -weights standard unit kg 1830 1980 2120 2340 2420 3040 3110 3190

model A kg 1570 1720 1860 - - - - -model Z-H (F-H) kg 1920 2070 2210 2350 2430 3050 3160 3200

subject to modifications

6

DIAGRAM AND DESCRIPTION VARIO P 1 - 3

1 dirty air inlet; on optional sides of the unit2 baffle plate; at the dirty air inlet3 filter elements4 waste disposal bin5 clamping mechanism for disposal bin6 jet piping to clean the filter elements7 suction nozzle8 fan impeller; directly coupled with the motor9 radial fan10 compressed air tank11 diaphragm valves; electromagnetic12 motor with three built-in temperature probes

(for motor protection)13 sound-absorbing lining14 compressed air connection for VARIO 1 - 3 with ½" fitting15 clean air outlet; pipe connection possible

VARIO P 1 - 3 FEATURES

Unit type VARIO P1 VARIO P2 VARIO P3

filter elements cartridge 327/600 327/985 327/985amount pcs. 4 6 8

motor1) output kW 3,3 7,5 12,5valves2) amount pcs. 2 3 4compressed air3) consumption L/min 6 9 12sound level4) dB(A) 72 75 75weights basic unit kg 680 1110 1700

variation A kg 550 870 1390variation Z/F kg 650 1050 1670

1) Voltage 400 Volt/50 Hz, speed 3000 min -1.2) Nominal width 2”, voltage 24 Volt DC.3) Nominal pressure 4 - 5 bar. Consumption litre in normal

conditions if the pulse pause between the pulses is 250 - 400 s. These are estimated values and can differ depending on dust quantity and quality.

4) Measured in 1 m distance in front of the unit (door). Measured according to DIN EN ISO 3744, freefield conditions.

subject to modifiations

7

DIAGRAM AND DESCRIPTION OF VARIO 4 - 6

1 dirty air inlet; on optional sides of the unit2 baffle plate; at the dirty air inlet3 filter elements4 clamping mechanism for disposal bin5 waste disposal bin6 jet piping to clean the filter elements7 compressed air connection for VARIO 4 - 6 with 1" nozzle 8 compressed air tank9 diaphragm valves; electromagnetic10 terminal box11 clean air outlet; pipe connection possible12 support frame13 hopper14 filter housing without waste disposal device15 motor with three built-in temperature probes

(for motor protection)16 radial fan

9

87

3

4

5

10

11

6

12

12

VARIO 4-6 variation H

11

16

15

10

6

12

13

12

8

7

14

VARIO 4-6 with top mounted fan

COMPACT DESIGN, HIGH FILTRATION EFFICIENCY - SERIES VARIO 4 - 6

1) voltage 400 V/50 Hz; speed 3000 r.p.m.2) nominal width 2 inches; 24 Volt DC3) nominal pressure 6 bar; consumption in litres under normal

operating conditions, if the pause between pulses is 30 seconds4) measured at a distance of 1 m from the unit (door); with

connected suction and discharge ductworks, measured accordingto DIN EN ISO 3744, field conditions.

Unit type VARIO 4 VARIO 5 VARIO 64.1 4.2 4.3 5.1-H 5.2-H 6.1-H 6.2-H 6.3-H

filter elements SINBRAN, Multitube, Y-Filter 1500/18 1500/ 18 1500/ 18amount pcs. 16 18 20 24 28 32 36 40

motor1) output kW 15 18,5 22,0 - - - - -valves2) amount pcs. 8 9 10 12 14 16 18 20compressed air3) consumption l/min 250 350 500sound level4) dB(A) 76 - -weights standard unit kg 1830 1980 2120 2340 2420 3040 3110 3190

model A kg 1570 1720 1860 - - - - -model Z-H (F-H) kg 1920 2070 2210 2350 2430 3050 3160 3200

subject to modifications

VARIO 4 variation Z with top mounted fan

5450

400

2190

2410

4600

1540

700

1540

710

261040

0

710

1540

2190

1300

1420x470

400

710

1540

2190

1300

VARIO 4 basic unit

COMPACT DESIGN, HIGH FILTRATION EFFICIENCY - SERIES VARIO 4 - 6

2400

1540

470

1260

1540

1040

3300

1420x470

VARIO 5 basic unit H VARIO 5 variation Z-H

5260

2260

3000

2400

700

1540

1420x470

1420

3220

470

VARIO 4 basic unit with top mounted fan

8 5

FEATURES OF THE VARIO 1 - 3

VARIO 1-3

VARIO 1-3 series

DIAGRAM AND DESCRIPTION OF VARIO 1 - 3

1 dirty air inlet; on optional sides of the unit2 baffle plate; at the dirty air inlet3 filter elements4 waste disposal bin5 clamping mechanism for disposal bin6 jet piping to clean the filter elements7 suction nozzle8 fan impeller; directly coupled with the motor9 radial fan10 compressed air tank11 diaphragm valves; electromagnetic12 motor with three built-in temperature probes

(for motor protection)13 sound-absorbing lining14 compressed air connection for VARIO 1 - 3 with ½" fitting15 clean air outlet; pipe connection possible 16 door to access the filter housing17 electrical switch control cabinet or terminal box18 safety device against fall19 filter housing without waste disposal device20 connecting frame21 rotary valve22 support frame23 hopper24 electrical connection

14

11

10

6

3

4

5

15

1213

987

1

2

15

16

4

17

1819, 20

17

21

14, 24

23

22

Unit Type VARIO 1 VARIO 2 VARIO 31.1 1.2 1.3 2.1 2.2 2.3 3.2 3.3

filter elements SINBRAN, multitube, Y-Filter 900/ 12 1200/ 18 1500/ 18amount pcs. 4 6 8 8 10 12 12 14

motor1) output kW 3,3 3,3 3,3 5,5 7,5 11,0 12,5 15,0valves2) amount pcs. 2 3 4 4 5 6 6 7compressed air3) consumption l/min 20 30 40sound level4) dB(A) 72 75 75weights basic unit kg 640 660 680 1040 1070 1110 1660 1700

variation A kg 550 570 590 870 890 910 1390 1430variation Z/F kg 650 670 690 1050 1080 1120 1670 1710

1) voltage 400 V/50 Hz; speed 3000 r.p.m.2) nominal width 2 inches; 24 Volt DC3) nominal pressure 6 bar; consumption in litres under normal operating conditions,

if the pause between pulses is 3 minutes

4) measured at a distance of 1 m from the unit (door); measured according to DIN EN ISO 3744, field conditions

subject to modifications

4

The VARIO is available in different sizes and designs.Calculating the air flow to be exhausted (m³/hr) is essential forselecting the right unit.Different variations are available.

VARIO UNIT TYPES

2630

1125

700 602

412

Ø 315

Ø 250

800

1000

1855

3655

700

3655

1150

675

780Ø 560

Ø 500

1540

1100

1350

1350

3860

1100

2760

4960

700

4960

1150

900

2630

1235

1050

1350

Ø 400

Ø 450

515

2300

4555

700

4555

1150

VARIO 2, basic unit and variations A, Z, F

VARIO 1, basic unit and variations A, Z, F

VARIO 3, basic unit and variations A, Z, F

1420x47015

1056

0

3080

1540

1300

1800

3490

1420x470

560

3410

700

3080

1800

1540

5390

2190

3200

VARIO 6 basic unit H VARIO 6 variation Z-H

Unit type VARIO 4 VARIO 5 VARIO 64.1 4.2 4.3 5.1-H 5.2-H 6.1-H 6.2-H 6.3-H

filter elements SINBRAN, Multitube, Y-Filter 1500/18 1500/ 18 1500/ 18amount pcs. 16 18 20 24 28 32 36 40

motor1) output kW 15 18,5 22,0 - - - - -valves2) amount pcs. 8 9 10 12 14 16 18 20compressed air3) consumption l/min 250 350 500sound level4) dB(A) 76 - -weights standard unit kg 1830 1980 2120 2340 2420 3040 3110 3190

model A kg 1570 1720 1860 - - - - -model Z-H (F-H) kg 1920 2070 2210 2350 2430 3050 3160 3200

subject to modifications

9

14

12

68

16

11

15

12

13

9

3

4

FEATURES OF THE VARIO P 4

Unit type VARIO P4-10 VARIO P4-12

filter elements cartridge 327/985 327/985amount pcs. 10 12

motor1) output kW 15,0 18,5valves2) amount pcs. 5 6compressed air3) consumption L/min 19 19sound level4) dB(A) 76 76weights standard unit kg 1900 1980

model A kg 1640 1720model Z/F kg 1890 2070

subject to modifications1) Voltage 400 Volt/50 Hz, speed 3000 min -1.2) Nominal width 2”, voltage 24 Volt DC.3) Nominal pressure 4 - 5 bar. Consumption litre in normal

conditions if the pulse pause between the pulses is 250 - 400 s. These are estimated values and can differ depending on dust quantity and quality.

4) Measured in 1 m distance in front of the unit (door). Measured according to DIN EN ISO 3744, freefield conditions.

DIAGRAM AND DESCRIPTION OF VARIO P 4 - 6

1 dirty air inlet; on optional sides of the unit2 baffle plate; at the dirty air inlet3 filter elements4 clamping mechanism for disposal bin5 waste disposal bin6 jet piping to clean the filter elements7 compressed air connection for VARIO P 4 - 6

with 1" nozzle 8 compressed air tank9 diaphragm valves; electromagnetic10 terminal box11 clean air outlet; pipe connection possible12 support frame13 hopper14 filter housing without waste disposal device15 motor with three built-in temperature probes

(for motor protection)16 radial fan

103

VENTING OUTDOORS OR RE-CIRCULATION

Air recirculation is often possible with the use of high-qualitySINBRAN filter elements. The cleaned air can be ducted andchanneled (even with heat exchangers) to the outdoors, or re-circulated back into the workplace. Alternate venting orrecirculation can be accomplished by activating a switch within the exhaust duct.

We will be pleased to furnish you with detailed informationregarding the feasibility of a recirculation system, ensuringcompliance with your local rules and regulations.

PLACEMENT

The VARIO filter unit is meant for indoor use, adjacent to thedevice to be exhausted. Outdoor installation is possible, provided certain protective measures are adopted.

SAFETY

The VARIO filter unit can be equipped with additional safetyprecautions when processing combustible or explosive dusts.

FAN SECTION

The direct-drive radial fan is very silent. Depending on thesize of the filter unit, the fan is either integrated, top-mountedor placed next to it.

Two VARIO 6; exhaust systems for dust created by spring steel grinding processes

VARIO 3

VARIO 4

2

ADVANTAGES– high-quality filter element

– compact construction

– large filter area

– low filter resistance

– integrated sound insulation

OPERATION

The dust-laden air flows through the dirty air inlet into the filter unit. A baffle plate slows down and deflects the dustparticles to protect the filter elements from direct impact. Anair down-flow is created between the filter elements, allowingthe dust particles to drop. A fan in the clean air chamberdraws the polluted air through the filter elements, depositingthe dust particles onto the filter surface. Because the filterelements are cleaned continuously by compressed air pulsesduring operation, the air flow remains constant. The cleanedair exits through the top of the unit and in most cases can bere-circulated into the work area or vented outdoors. The separated dust falls into the dust collector containers.

FILTER ELEMENTS

The SINBRAN filter elements, a combination of sintered polyethylene and laminated GORETM-membran, combine theadvantage of membrane filtration (low pressure loss with highfiltration efficiency) with a long-life rigid frame construction.These elements are reusable, have “BGIA” test certificationaccording to DIN EN 6035-2-69 Appendix AA (08/99) and meetthe requirements of dust class "M", formerly known as categories U, S, G and C. Alternative filter elements such ascartridge filters, multitube and Y-filters are also available.

CLEANING THE FILTER ELEMENTS

The pulse cleaning cycle can be adjusted for each applicationby means of an integrated control unit. The air flow of the fanremains nearly constant. The cleaning operation is activatedeither by a differential pressure regulator while in operation,or by a programmable downtime cleaning cycle.

WASTE DISPOSAL

The air-tight and dust-tight disposal bins are connected to thefilter's hopper with a clamping device, simplifying the exchange of dust collector containers.

The reusable bins can be directly discharged with the use of aclosed lid and clamping ring. For large dust quantities orduring 24-hour operation, continuous disposal is accomplishedby means of an air lock.

VARIO 2, exhaust system for dust created by grinding and polishing processes

accessories

114

64

116

110

120

115

50

104

ACCESSORIES FOR VARIO UNITS

Access.ref. Designation Description

50 Connecting elbow to connect ductwork for dirty air and clean air openings

64 Compressed air regulator integrated oil and condensation separator with automatic drain and pressure reducer bymanometer

104 Injector device IN compressed air operated suction vacuum to keep the workstation tidy as well as clean thework pieces and machines. Connected to the separator (please request the special information sheet)

110 Additional silencer to reduce the noise level by about 5 dB(A)

114 Shed with sound-insulating lining

for outdoor installation. Reduces the discharge noise by about 4 dB(A).

115 Vibration damper four rubber-metal elements for the substructure, to prevent the transfer of vibrations to buildings or foundations

116 Stepladder with railing facilitates inspection and maintenance work

120 Electrical differentialpressure measuring gauge

steady measurement of filter resistance and triggers the compressed air pulses to clean thefilter elements as needed (when the resistance exceeds the preset limit value)

11

Keller USA, Inc.54 Great Hill Road, P.O. Box 546Naugatuck, CT 06770 USAPhone (203) 729-0145 . Fax (203) 729-0148E-mail: info@kellerusa.comwww.kellerusa.com

REFERENCE INSTALLATIONS

AIR FILTRATIONSYSTEM SOLUTIONS

AIR FILTRATIONSYSTEM SOLUTIONS

VARIO – SEPARATION OF FINE DUST PARTICLES

THE TASK

Keller plans, engineers, and manufactures air pollution controlsystems for the capture, removal and separation of airborneparticles for all types of industry. High filtration efficiency isachieved with the use of innovative filtration technology andefficient design. Suitable exhaust systems offer solutions toindividual problems at high levels of quality.

The VARIO series is particularly suitable for the separation offine dust. Nearly all types of dust can be successfully separated, such as those created in metal processing, polymerprocessing, and in chemical, pharmaceutical and ceramic industries, as well as non-metallic minerals.

The VARIO units are of modular construction in order to meetdifferent requirements, such as dust characteristics or thevolume of exhausted air. Sturdy and low-noise units allow forreliable 24-hr. operation with constant air flow. Short deliverytimes and competitive pricing are possible because of seriesproduction planning.

SCOPE OF APPLICATIONS

Machining processes: – lathing, drilling, milling, grinding– removing bulk waste– blending, fusing– measuring– manufacturingThermal processes: – laser cutting/etching– welding

VARIO 6.2, durable, heavy-duty assembly

VARIO 6, for welding fume exhaust