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The green colored rigid ear, lug, or the like extending from the adapter must be connected to a permanent ground such as a properly grounded outlet
box cover. Whenever the adapter is used, it must be held in place by a metal screw. This adapter shown in Fig. B and Fig. C is not acceptable in
Canada.
Extension Cords – Use only a 3-wire extension cord that has a 3-blade grounding plug, and a 3-slot receptacle that will accept the plug on the
product. Make sure your extension cord is in good condition. When using an extension cord, be sure to use one heavy enough to carry the current your
product will draw. For lengths less than 25 feet, No. 18 AWG extension cords should be used. For lengths less than 100 feet, No. 12 AWG extension
cords should be used. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating. If in doubt, use the next heavier
gage. The smaller the gage number, the heavier the cord.
Ambient Conditions – This unit should be operated in a well-ventilated area where the surrounding air is relatively clean, dry and temperatures are
consistently within the range of 41°F (5°C) and 104 °F (40°C). Adequate ventilation is required for pr oper operation.
Operation
The intended use for this vacuum pump is for general physical and chemical laboratory applications requiring vacuum
ranging from atmospheric pressure down to an ultimate vacuum of 2 mbar.
1.
The pump is equipped with an ON/OFF (O/I) power switch.
2.
Gas Ballast – A gas ballast valve (A) is provided on the pump. When condensable vapors are pumped, they may be
compressed above the saturated vapor pressure and condense in the pump. Opening the gas ballast valve admits air
into the last stage of the vacuum pump there by reducing the partial pressure of the condensable vapors and preventing
condensation and flushing the pump clear. Gas ballast operation leads to increasing the ultimate pressure and operating
temperature.
Fig. 2 Gas ballast valve
Maintenance
General Requirements
1. Check the pump daily for unusual running noises and heat building up on the surface of the pump.
2. Replace the diaphragm after 10,000 operating hours. The user may specify replacement be made earlier, depending
upon the application process.
3. Check the electrical and vacuum connections daily.
4. When the unit is not in use, Unplug and wrap the cord securely and store in a dry place. Do not abuse cord or plug.
5. Inspect hose, plug and cord for signs of damage before use. Do not use if a deficiency is found. Contact your nearest
service centre for replacement parts. Never operate a damaged unit.
Maintenance Performed by the User
1. Warning! Be sure to unplug the pump before conducting any maintenance work.
2. Loosen and remove the hoses
3. Open and remove the pump heads
4. Inspect the pump chambers, diaphragms and valves
5. Deposits in the inside of the pump must be cleaned out
6. Change the diaphragms, valves and seals