Pfeiffer Vacuum PK 007 300 -T User manual

PD 0091 BEN/A (1609)
OPERATING INSTRUCTIONS EN
Translation of the original instructions
UNO/DUO 35/65 C/M/MC
Gas flushing device

2
About this manual
1 About this manual
1.1 Validity This operating manual is for customers of Pfeiffer Vacuum. It describes the functioning
of the designated product and provides the most important information for safe use of
the unit. The description follows applicableEU guidelines. All information provided inthis
operating manual refers to the current state of the product's development. The documen-
tation remains valid as long as the customer does not make any changes to the product.
Up-to-date operating instructions can also be downloaded from
www.pfeiffer-vacuum.com.
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating instructions are the result of risk
evaluations and hazard analyses and are oriented on international certification stan-
dards as specified by UL, CSA, ANSI Z-535, SEMI S1, ISO 3864 and DIN 4844. In this
document, the following hazard levels and information are considered:
Pictographs
DANGER
Imminent danger
Indicates an imminent hazardous situation that will result in death or serious injury.
WARNING
Possibly imminent danger
Indicates an imminent hazardous situation that can result in death or serious injury.
CAUTION
Possibly imminent danger
Indicates an imminent hazardous situation that can result in minor or moderate injury.
NOTICE
Command or note
Command to perform an action or information about properties, the disregarding of
which may result in damage to the product.
Prohibition of an action to avoid any risk of accidents, the disregarding
of which may result in serious accidents
Warning of a displayed source of danger in connection with operation of
the unit or equipment
Command to perform an action or task associated with a source of dan-
ger, the disregarding of which may result in serious accidents

Product description
3
2 Product description
2.1 Function In cases where gases or vapours are being pumped that are corrosive or that could con-
taminate equipment, it is recommended to flush the vacuum pump using inert gas to ex-
tend the service life of the operating fluid. The gas flushing device is installed via a hole
in the cap on the pump, whereby the gas is fed into the pump's operating fluid reservoir
viaa tube.This saturatesthe operatingfluid with inert gas, preventingthe pumped gases
being dissolved in the oil. The gas introduced also reduces the oil temperature and thus
also lowers the risk of corrosion.
Fig. 1: Gas flushing device for Uno/Duo 35/65 M/C/MC

4
Installation
3 Installation
3.1 Fitting the gas flushing device
3.2 Draining the operating fluid
Turn off the vacuum pump and vent to atmospheric pressure.
Unscrew operating fluid filler screw 140.
Unscrew operating fluid drain screw 142.
Drain the operating fluid while still quite hot;
– to empty the pump fully, tip it forward slightly.
Screw in operating fluid drain screw 142; pay attention to O-ring.
Separate the operating fluid from the condensate.
– If the drained operating fluid is free of contamination, it can be reused.
Fig. 2: Draining the operating fluid
WARNING
Hot operating fluid!
Danger of burns when draining due to contact with skin.
Wear suitable protective clothing.
Use a suitable collecting vessel.
WARNING
Operating fluid may contain toxic substances from the pumped media!
Danger of poisoning from the emission of harmful substances from the operating fluid.
Wear suitable protective clothing and respirators.
Dispose of operating fluid according to the local regulations
140
142

Installation
5
3.3 Remove the cap
Fig. 3: Remove the cap
Unscrew bolt 1 and remove gas ballast valve 2.
Unscrew bolt 3 a remove cap 4 axially; note the spring washer.
Clean the inside of cap 4.
Remove sealing bolt 5.
3.4 Assembling
Fig. 4: Fit flushing gas tube.
Insert flushing gas tube from the inside of the cap through hole "5".
3
3
5
2
1
4
238
5
260
261
261
262 263
264
4

6
Operation
Insert o-ring 238 and screw connection 261 via the end of the tube and screw into the
cap (size 19).
Tighten the crown nut on screw connection 261 (size 14)
– whilst aligning the tube so that it is positioned close to the capbase without making
contact with the side panel.
Push screw connection 262 onto the tube from above, tighten (size 14) and counter-
lock using a second wrench (size 14).
Seal the connection thread with sealing plug 264 and sealing ring 263.
Fit the cap, checking that the sealing surfaces and o-rings are clean and undamaged.
Dismantling Note: It is not possible to remove the flushing gas tube without destroying the tube. If
necessary, it is recommended to lift the tube up slightly and to cut it above the screw con-
nection using a pipe cutter.
3.5 Conducting a leak test
Pumps of C, M and MC
versions Before filling with operating fluid, it is necessary to conduct a helium leak test on the pump housing:
Helium leak test: < 1 · 10-7 Pa m3/s
3.6 Installing the gas supply
Unscrewsealing bolt 264and counter-secureon screw connection262 (size14); note
the sealing ring 263.
Connect the supply line for the flushing gas (1/8" internal taper thread), note the seal.
4Operation
4.1 Commissioning
For processes requiring a gas supply, a shut-off valve should always be installed on the
pump's vacuum flange. This means it is only possible connect up the pump to the vacu-
um system once the operating temperature has been reached.
Switch pump on and bring to operating temperature.
Open the flushing gas supply and check the flow.
Set flushing gas pressure; max. recommended pressure 200 hPa (relative),
– corresponding to a gas flow of approx. 2000 Nl/h.
Open the shut-off valve on the vacuum flange.
Monitor the flushing process during the entire process.
NOTICE
Non-permissibly high flushing gas pressure endangers the operational safety of
the pump.
A rising flushing gas volume increases the expulsion of operating fluids via the pump
exhaust.
Observe the max. permissible flushing gas pressure.
Adjust the flushing gas volume on-site.

Operation
7
4.2 Shutdown To purge the gas from the oil effectively, and to clean the pumped gas residues from the
pump, the pump should be disconnected from the vacuum system once the process has
ended, and should be run on for around one hour at final pressure with the flushing de-
vice switched on (duration depends on the volume of gas being conveyed).
Stop the flushing gas supply and seal the supply line securely.
Turn off the vacuum pump and vent to atmospheric pressure.
NOTICE
Continuous operation
After switching off, condensate or penetrative humidity may react with process residues
and damage the pump.
It is always recommended to operate the pump in continuous operation.

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