BUSCH COBRA NC 0100 300 B Series, Дополнение к инструкции по установке и обслуживанию

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English
Introduction
Congratulations on your purchase of the Busch vacuum pump. With
watchful observation of the field’s requirements, innovation and steady
development Busch delivers modern vacuum and pressure solutions
worldwide.
These operating instructions contain information for
–
product description,
–
security,
–
installation and commissioning,
–
maintenance,
of the the vacuum pump.
For the purpose of these instructions, “handling” the vacuum system
means the installation, commissioning, influence on operating condi-
tions and maintenance of the vacuum system.
Prior to handling the vacuum system, these operating instructions
shall be read and understood. If anything remains to be clarified
please contact your Busch representative!
Keep these operating instructions and, if applicable, other pertinent
operating instructions available on site.
Please keep the documentation for further reference.
Description
CAUTION
The indications noted in this chapter replace the indications of the
standard installation and operating manuals !
Area of application
The COBRA NC 0100 ... 0300 B vacuum pumps are certified for dra-
wing explosive gas and vapour mixtures out of and in zone 1 or
zone 2.
The vacuum pump can draw explosives gases or vapours of explosion
group IIB and temperature class T4 (COBRA NC 0100/ 0200/ 0300 B)
or T3 (only COBRA NC 0200/ 0300 B). The outside of the vacuum
pump is an equipment of temperature class T4 (COBRA NC 0100/
0200/ 0300 B) or T3 (only COBRA NC 0200/ 0300 B). Please also note
the corresponding explosion protection markings on the pump and the
switch off temperature setting.
The vacuum pump should not be used for the handling of explosive at-
mospheres, which can self-destruct or are chemically unstable.
The vacuum system may be set up in zone 1 or zone 2 areas.
The authorized ambient temperature is situated between -20 °C and
+40 °C.
The temperature of the sucked gases must be inferior to 60 °C.
For category 2G(i/o) or 2G(i) vacuum pumps, the authorized back
pressure at exhaust will be controlled through PSA+/ 0301 (see table
below):
COBRA Back pressure
NC 0100...0300 B 300 hPa
NT 0100 & 0300 B 300 hPa
The vacuum pump should only be used if the material is made to resist
to chemical and mechanical influences (e.g. corrosion) during opera-
tion, so that the explosion protection isn’t suppressed. This is particu-
larly applicable for the safety devices, such as temperature probe and
pressure switch.
General description
The vacuum system consists of a single-stage screw vacuum pump, as
well as the necessary supervisory and monitoring equipment. The va-
cuum system is mounted on a robust base frame and completely wired
up with Exi or Exe terminal boxes. The vacuum pump is equipped with
a direct cooling system or a recirculating cooling system to cool the
pump.
Operation / Running
Start up of the pump
Before the effective start up of the vacuum pump, the screw vacuum
pump has to be inertised inside, when it could not be excluded that an
explosive mixture is present inside the pump. This will be achieved on
flushing the vacuum pump with an non explosive gas, e.g. air or nitro-
gen, when the pump is stopped and the pump inlet is closed.
Introduction
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