Bissell HS-20 Section, INSTALLATION 1-1 GENERAL, OPERATING SPECIFICATIONS See Figure, Model

SECTION I

INSTALLATION

1-1 GENERAL

Upon receipt, inspect the container for evidence of damage in shipment. Do not discard any evidence of rough handling. Factory packing provides for maximum protection during shipment. However, the pump should be inspected immediately and any damage should be reported to the carrier without delay.

Before unpacking and installing the pump, the user should thoroughly familiarize himself with the contents of this instruction manual, particularly the physical and operating specifications listed in the following paragraphs, in order to gain a better understanding of the operating principles, limitations, correct application of the diffusion pump, the hazards involved, and what to do and what not to do in order to avoid these hazards.

1-2 OPERATING SPECIFICATIONS (See Figure 1-1)

Table 1-1 lists the specifications for all standard models of the HS-20 diffusion pump.

Table 1-1. HS-20 Diffusion Pump Specifications

Model	Technical Specifications
Optimum Operating Range	6 x 10-4Torr to < 1 x 10-9Torr
	8 x 10-2Pa to < 1.3 x 10-7Pa
	7.8 x 10-4mbar to <1.3 x 10-9Torr
Maximum Pumping Speed	17,500 liters/sec for air
(See Figure 1-1)	21,000 liters/sec for helium
Maximum Throughput	18 Torr-liters/sec
at 1 x 10-2Torr	2394 Pa-liters/sec
	23.4 mbar-liters/sec
Maximum Forepressure	No Load: 0.65Torr; 86.5 Pa; 0.85 millibar
	Full Load: 0.55Torr; 73.2 Pa; 0.72 mbar
Backstreaming Rate at Pump Inlet	0.0015 mg/cm2/min
Power Required (approximately)	12 KW, 240/380/480V, 50/60 Hz, 3-phase
Warmup Time	45 minutes
Cooldown Time(using quick cool)	85 minutes (45 minutes)
Fluid Charge	5 U.S. quarts (4.75 liters)
Cooling Water Requirements	1.5 gpm at 60°F to 80°F inlet temperatures
Pressure drop across cooling circuits	15 psi
of cold cap and body in series
Backing Pump Size Recommended	100 cfm for maximum throughput

1-1