Before use
04
Precautions about safety in operation
<Application>
(1) This pump is not designed for explosion-proof construction. Do not use for exhaust of explosive gas.
(2) Suction gas may leak out of the pump main unit from other area than exhaust vent. Do not use for
exhaust of toxic gas. When toxic gas is exhausted by any chance, internal pump may be polluted by
the toxic gas. Please pay attention during maintenance work.
<Maintenance / repair>
(3) When requesting ULVAC overhaul, fill the type of suction gas in "Usage Status Check Sheet"
provided at the end of this Instruction Manual. In case the pump is used for exhaust of toxic gas by
any chance, internal pump unit is polluted by the toxic gas. Overhaul of some contaminated pump
cannot be made according to the type of toxic gas. Please pay enough attention.
<Suction gas>
(4) Suction gas may leak out of the pump main unit from other area than exhaust vent.
Do not use for exhaust of toxic gas.
<Leakage rate>
(5) The amount of the leakage of this pump is recorded. Use it in consideration of the leak rate. The
helium gas is used for the Leak examination. Leakage rate:2.6
×
10
-4
Pa
･
m
3
/sec
※：
The measurement of the amount of Leake rate the inside of the pump a vacuum and is a
measurement of the amount of penetration of the helium gas.
(6) The amount inspection of leaks
（
Flux inspection by the side of an exhaust gas by attainment
pressure
）
0.03L/min
<Grounding Instructions [Plug]>
(7) This product must be grounded. In the event of an electrical short circuit, grounding reduces
the risk of electric shock by providing an escape wire for the electric current.
If the product is equipped with a cord having a grounding wire with an appropriate grounding
plug, the plug must be plugged into an outlet that is properly installed and grounded in
accordance with all local
codes and ordinances.
(8) Improper installation of the grounding plug can result in a risk of electric shock. If repair or
replacement of the cord or plug is necessary, do not connect the
grounding wire to either flat
blade terminal. The wire with insulation having an outer surface that is green with or without
yellow stripes is the grounding wire.
(9)
Check with a qualified electrician or serviceman when the grounding instructions are not
completely understood, or when in doubt as to whether the product is properly grounded. Do
not modify the plug provided; if it does not fit the outlet, have the proper outlet installed by a
qualified electrician.
(10)DTU-20B is for use on a nominal 115_V circuit, and has a grounding plug similar to the plug
iiiustrated in sketch A in figure. A temporary adapter similar to the adapter illustrated in
sketches B and C may be used to connect this plug to a 2_pole receptacle as shown in
sketch B when a properly grounded outlet is not available. The temporary adapter shall be
used only until a properly grounded outlet (sketch A) is installed by a qualified electrician.
The green colored rigid ear, lug, or similar part 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.
DANGER
Quotation from UL1450
