Welch 8905 - Section 03 - Specifications; Specification Chart

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Section 3: PUMP SPECIFICATIONS
3.01 Specication Chart
* Partial measurement based upon the American Vacuum Society Test Procedure No. AVS 5.1-1963
using a trapped McLeod Gauge.
SPECIFICATION 8905 8920 8925
Free Air Displacement
CFM (L/min) @ 60Hz 1.8 (52) 7.7 (218) 11.3 (320)
(L/min) m3h @ 50Hz (43) 1.5 (182) 10.8 (266) 16.0
Normal Pumping Speed
CFM (L/min) @ 60Hz 1.5 (43) 7.4 (210) 10.0 (283)
(L/min) m3h @ 50Hz (36) 1.3 (175) 10.5 (236) 14.2
Guaranteed Ultimate Pressure* Torr
2 x 10
-3
3 x 10
-4
4 x 10
-4
Water Vapor Tolerance (capacity), Torr 6 15 15
Water Vapor Tolerance (capacity), g/hr 30 180 180
Sound Level dBA 56 54 55
Motor/Pump Speed
RPM @ 60Hz 3450 1725 1725
RPM @ 50Hz 2875 1425 1425
Motor Voltage 50/60Hz Single Phase
Current 115V (230V) @ 60Hz 3.8A (1.9A) 6.8A (3.4A) 10.0A (5.0A)
Current 230V @ 50Hz 1.2A 3.4A 5.0A
Motor Horsepower 1/4 1/2 3/4
Oil Capacity , quarts (liters) 0.42 (0.4) 1.3 (1.2) 1.2 (1.1)
Unibarb for Unibarb for Unibarb for
3/16" and 7/16" 9/16" and 13/16" 9/16" and 13/16"
Intake Connection I.D. Hose, I.D. Hose, I.D. Hose,
Threaded for Threaded for Threaded for
3/4"-20 1-1/8"-20 1-1/8"-20
Tubing needed, I.D.
in inches 3/16 or 7/16 9/16 or 13/16 9/16 or 13/16
in mm 5 or 11 14 or 20 14 or 20
Exhaust Connection 3/4"-20 Thread 1"-20 Thread 1"-20 Thread
Gas Ballast Connection 10-32 Thread 10-32 Thread 10-32 Thread
Pump Weight
lbs. 24.5 58.5 63
Kg. 11.1 26.6 31.3
Overall Dimensions
Length (inch / cm) 14.5 / 36.8 20.8 / 52.8 22.2 / 56.4
Width (inch / cm) 5.1/ 13 7.1 / 17.9 7.1 / 17.9
Height (inch / cm) 8.4 / 21.3 11.0 / 27.9 11.0 / 27.9
Shipping Weight
lbs. 26 71 77
Kg. 11.8 32.2 34.6
Shipping Carton Dimensions
Length (inch / cm) 21 / 53.3 29 / 73.7 29 / 73.7
Width (inch / cm) 6.5 / 16.5 10 / 25.4 10 / 25.4
Height (inch / cm) 11.2 / 28.6 14 / 35.6 14 / 35.6
Exhaust Filter (Optional) Cat. No. 1416B / 1417 1417P-10 / 1416C 1417P-10 / 1416C
Oil Type Cat. No. 8995P / 8995G 8995P / 8995G 8995P / 8995G