Welch Vacuum 2581B-50 WOB-L Pinston Pump - Manual (Page 5)

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Section 2: INSTALLATION
2.10 Introduction
This manual has been compiled not only for the care and maintenance of the Welch Dry Vacuum System
now in your possession, but as a helpful reference and guide to prevent many problems which can occur
if used improperly.
2.11 Unpacking
Carefully remove the Dry Vacuum System from the shipping carton. Preserve all paperwork for future
reference. If damage has occurred from shipment a claim must be filed with the carrier immediately;
preserve the shipping carton for inspection by the carrier. If you are required to communicate with your
dealer or Welch Vacuum be sure to include your order numbers for quick identification. Do not return
the system to the factory without first calling for a returned goods number. Call (847) 676-8800
2.12 System Mounting
Rubber feet are attached to the pump. Rubber feet are excellent for applications involving a
semi-flexible surface such as a bench top; they help to isolate noise and eliminate creeping.
2.13 System Location and Enviromental Condition
The Dry Vacuum System should be located preferably in a clean, dry and well ventilated area. Please
be sure not to block the ventilation ports located on the metal shell. The pump should be placed where
the surrounding temperature remains between 10°C and 40°C (50°F and 104°F). Always check to insure
the location chosen is protected from direct or indirect moisture contact. The pump should be located as
closely to its system in order to utilize it most efficiently. The pump is rated for indoor use only.
Maximum altitude 2000 meters. Operating temperature range 5°C to 40°C. Maximum relative humidity
of 80% for temp. up to 31°C decreasing to 50% at 40°C. Rated for ±10% of supply voltage.
Pollution Degree2, Installation Category II.
2.14 Inlet and Outlet Provisions
A inlet hose barb which accepts ¼” I.D. hose makes it easy to connect the system to your concentrator,
rotary evaporator or gel dryer. Since the vacuum system operates in the viscous flow regime, the small
diameter of the hose will generate minimal conductance loss. For best results, Welch recommends the
length of the tubing between the pump and the apparatus be kept as short as possible. Hose clamps
should be used to hold the hose in place.
The hose barb in the outlet port of the pump accepts ¼” ID hose. A vent line can be attached to the
outlet hose barb which allows gases and vapors pumped through the pump to be piped to a fume hood.
Be sure to call Welch technical service prior to start-up at (847) 676-8800 if you have any questions.
WARNING
Don’t operate this pump in an atmosphere
containing flammable or explosive gases or vapors.
WARNING
The motor is thermally protected and will automatically
restart unexpectedly when the overload device resets.
WARNING
Never Block The Outer Port. If the outlet is blocked, pressure will
buildup in the pump which can lead to the pump head bursting
creating the potential of serious injury.
Remove plug from outer port.