Pfeiffer Vacuum Hena 26 User manual

PD 0085 BEN/A (1603)
OPERATING INSTRUCTIONS EN
Translation of the original instructions
HENA 26/41
Rotary Vane Pump

Table of contents
2
Table of contents
1 About this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Protective equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Improper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Transport and storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Product description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3 Range of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Setting up the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Connecting the vacuum side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.3 Connecting the exhaust side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.4 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.5 Filling up the operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1 Before switching on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2 Switching on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.3 Pumping condensable vapours. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.4 Topping up the operating fluid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.5 Switching off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.2 Changing the operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.3 Changing the exhaust filter in the operating fluid separator . . . . . . . . . . . 25
7.4 Cleaning the operating fluid return line . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.5 Changing the gas ballast filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.6 Changing the intake filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.1 Shutting down for longer periods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.2 Re-starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9.1 Rectifying malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
11 Spare parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
11.1 Spare parts packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
12 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
13 Technical data and dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
13.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
13.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

About this manual
3
13.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Declaration of conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
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 applicable EU guidelines. All information provided in this
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.
Applicable docu-
ments
*also available via 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:
Hena 26/41 Operating instructions
Declaration of Conformity Part of this document
Operating instructions for accessories (order-specifically) see section "accessories"*
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.

4
About this manual
Pictographs
Instructions in the
text
Work instruction: here you have to do something.
Symbols used The following symbols are used consistently throughout in all illustrations:
Vacuum flange
Exhaust flange
Gas ballast valve
Power connection
Prohibition of an action or activity in connection with a source of danger,
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
Important information about the product or this document
V
G

Safety
5
2Safety
2.1 Safety precautions
●Do not expose any body parts to the vacuum.
●Observe the safety and accident prevention regulations.
●Check regularly that all safety precautions are being complied with.
●Do not carry out any unauthorised modifications or conversions to the pumps.
●Depending on the operating and ambient conditions, the surface temperature of the
pumps may rise above 70 °C. Use suitable finger guards if necessary.
●When returning the pumps to us please note the instructions in the Service section.
Duty to inform
Each person involved in the installation, operation or maintenance of the vacuum pump
must read and observe the safety-related parts of these operating instructions.
The operator is obligated to make operating personnel aware of dangers originating
from the vacuum pump, the pumped medium and the entire system.
Installation and operation of accessories
Pfeiffer Vacuum pumps can be equipped with a series of adapted accessories. The in-
stallation, operation and maintenance of connected devices are described in detail in
the operating instructions of the individual components.
For information on order numbers of components, see "Accessories".
Use original accessory parts only.

6
Safety
2.2 Protective equipment
Determined situations concerning the handling of vacuum pumps require wearing of per-
sonal protective equipment. The owner, respectively the employer are obligated to pro-
vide an adequate equipment to any operating persons.
2.3 Proper use
●The vacuum pump may only be used to generate a vacuum.
●Only use the vacuum pump for applications with oxygen concentration ≤21%.
●Installation, operating and maintenance regulations must be complied with.
●Other accessories, than those described in this manual, must not be used without the
agreement of Pfeiffer Vacuum.
DANGER
Danger to health by hazardous substances during maintenance or installation
Depending on the process vacuum pumps, components or operating fluids can be con-
taminated by toxic, reactive or radioactive substances.
Wear adequate protective equipment during maintenance and repairs or in case of
reinstallation.
CAUTION
Risk of injury through hot surfaces
Vacuum pumps can become hot during operation.
Allow the pump to cool before maintenance and repairs.
If necessary wear protective gloves according to EN 420.
WARNING
Increased noise emission!
Increased noise emission can occur within a limited area surrounding the vacuum
pump.
Provide noise protection or
wear hearing protection.
NOTICE
EC conformity
The manufacturer's declaration of conformity becomes invalid if the operator modifies
the original product or installs additional components.
Following installation into a plant and before commissioning, the operator must check
the entire system for compliance with the valid EU directives and reassess it accord-
ingly.

Safety
7
2.4 Improper use
Improper use will cause all claims for liability and warranties to be forfeited. Improper use
is defined as usage for purposes deviating from those mentioned above, especially:
●pumping of corrosive gases
●pumping of explosive media
●operation in potentially explosive areas
●pumping of gases containing impurities such as particles, dusts and condensate; note
the vapour compatibility levels of the pump
●pumping of substances that tend to sublime
●use of the vacuum pump to generate pressure
●pumping of liquids
●the use of operating fluids not specified by Pfeiffer Vacuum
●connection to pumps or units which are not suitable for this purpose according to their
operating instructions
●connection to units which have exposed voltage-carrying parts
●operation of the devices in areas with ionizing radiation

8
Transport and storage
3 Transport and storage
3.1 Transport
Fig. 1: Unpack and lift pump
Look for transportation damage when receiving the pump.
Use only a forklift to transport pump packed on pallet.
Unpack pump and undo screws on transport container.
Reuse the transport container of the vacuum pump.
– Transport or ship vacuum pumps in the original packing preferably.
Transport without
packaging
Remove the locking cap from the vacuum and exhaust flange immediately before con-
necting!
Use only the eye bolt on the top side of the pump to lift the pump.
To lift the pump without motor and if accessories are mounted, fit another strap at a
suitable position.
3.2 Storage
Check that all the openings on the pump are securely closed.
Fill up the pump with new operating fluid to the top edge of the sight glass.
Store the pump only indoors, preferably at temperatures between -10 °C and +40 °C.
– In rooms with moist or aggressive atmospheres, the pump must be airproof shrink-
wrapped in a plastic bag together with a bag of desiccant.
– After storage periods longer than two years, it is recommended to carry out main-
tenance and change the operating fluid before using the pump.
WARNING
Danger from falling and swinging loads!
When lifting the pump there is a danger of falling parts.
Make sure that there are no persons under the suspended load.
Close off and supervise the area under the pump.
CAUTION
Operating fluid overflows into the pump system if the pump is tilted!
Vane fractures when pump starts up.
Only transport pump without operating fluid.

Product description
9
4 Product description
4.1 Product identification
To correctly identify the product when communicating with Pfeiffer Vacuum, always have
the information from the rating plate available and use it:
●Pump model and model number
●Serial number
●Type and amount of operating fluid
●Date of manufacture
Please find the voltage range and motor-related data on the separately attached motor
rating plate.
Scope of delivery ●Pump with drive unit
●Operating fluid (except F4 and F5)
●Operating instructions
Pump types Pump type Pump designs
Hena 26 Pump in standard version
●Vacuum connection and gas outlet: G 1 1/4"
●Operating fluid return via float valve
●Gas ballast device without shut-off valve
Hena 41 Pump in standard version
●Vacuum connection and gas outlet: G 1 1/4"
●Operating fluid return via float valve
●Gas ballast device without shut-off valve

10
Product description
4.2 Function
The HenaLine™ series pumps are oil-sealed, single stage operating rotary vane pumps
with air cooling and circulatory lubrication. A vacuum safety valve in the intake flange
closes the intake line automatically and prevents operating fluid back-streaming when
the pump is switched off. An integrated oil mist filter cleans the pumped gas and prevents
the expulsion of operating fluid mist at the exhaust. The operating fluid, collected in the
separator, is fed back to the pump. In addition there is a filter mounted at the operating
fluid separator, which cleans the operating fluid.
Fig. 2: Hena 26/41
Oil circulation The vacuum pump requires operating fluid for sealing the gap, for lubrication and for
cooling. The operating fluid reservoir is on the pressure side of the vacuum pump on the
floor of the operating fluid separator. The pressure differential between the pressure side
and suction side automatically causes operating fluid to be sucked in over the supply
lines from the operating fluid separator and feed into the pumping system. The incoming
operating fluid, together with the incoming gas, is pumped through the vacuum pump and
exhausted into the operating fluid separator as oil mist. Operating fluid that is separated
at the exhaust filters collects in the upper part of operating fluid separator 75 and is re-
turned via operating fluid return line directly to the intake side.
Cooling The vacuum pump is cooled by heat radiation from the surface of the vacuum pump, the
air flow of the two fan impellers, and by the pumped gas.
1 Vacuum connection
2 Gas outlet
75 Operating fluid separator
83 Sight glass
88 Operating fluid filler screw
95 Operating fluid drain screw
100 Operating fluid filter
195 Operating fluid return line
321 Axial flow fan
400 Motor
400 75 2 1 321
195 88 83 95
10 0

Installation
11
4.3 Range of application
The vacuum pump is intended for the evacuation of air or other non-aggressive, non-poi-
sonous and non-explosive gases. Pumping media with a higher density than air results
in a higher thermal and mechanical load on the vacuum pump and the drive, and is only
permitted after prior consultation with Pfeiffer Vacuum.
5 Installation
5.1 Setting up the pump
Installation location Observe the following requirements when setting up the pump:
●Consider the load-bearing capacity of the installation site.
●Maximum installation altitude 1000 m (above mean sea level)
●Permissible ambient temperature: +12 ... 40°C
●Maximum relative humidity 95%
Fill up with operating fluid before operating the first time (see p. 16, chap. 5.5).
– Amount and type according to rating plate
Always place the pump on a firm, even surface.
– Where stationary installation is involved, anchor the pump on site.
When installing the pump in a closed housing, ensure there is sufficient air circulation.
– Sight glass and gas ballast valve must be visible and readily accessible.
– Voltage and frequency information given on the motor rating plate must be visible.
Fig. 3: Setting up the pump
> 200 mm
> 200 mm

12
Installation
5.2 Connecting the vacuum side
Remove locking cap from the vacuum flange and insert centering ring.
The connection between the pump and the vacuum chamber should be kept as short
as possible.
– Depending on the pump type, use metallic hoses or PVC hoses with flange con-
nections.
– Separators, filters etc. may be installed upstream to protect the pump (see acces-
sories). However, please observe the loss of pumping capacity due to the conduc-
tivity of the accessories.
5.3 Connecting the exhaust side
Choose the cross-section of the exhaust line to be at least the size of the nominal
connection diameter of the vacuum pump's exhaust connection.
Piping to the pump must be suspended or supported.
– Physical forces from the piping system must not be allowed to act on vacuum
pumps.
Lay piping from the pump sloping downward so that no condensate can flow back into
the pump; otherwise fit a condensate separator.
– If an air trap is created in the system, then a device for draining condensation water
must be provided at the lowest point.
CAUTION
High pressure in the exhaust line!
Risk of damage to the seals and risk of pump bursting.
Always use lines without shut-off devices on the exhaust side.
Do not use overpressure or underpressure - maintain atmospheric pressure.
WARNING
Emission of toxic substances from the exhaust!
Danger of poisoning from emitted gases or vapours, which can be detrimental to health
and/or can pollute the environment, depending on the particular application.
Comply with the applicable regulations when working with toxic substances.
Only officially approved filter systems may be used to separate and remove these
substances.

Installation
13
5.4 Connecting to the mains power supply
Depending on the pump type, different motor versions or mains voltages are possible:
●Single phase motor for fixed voltage without motor protection, mains cable and switch.
●Three-phase motor without motor protection.
Single phase motors Connect motor in terminal box in accordance with the connection diagram.
Motor protection
To protect the motor in case of malfunction, additionally provide a fuse protection in
accordance with the regional regulations.
– Select a fuse with slow characteristics according to the table below.
Three-phase motor The three-phase current motor circuit
Star Connection
The ends of the three coils are connected at the star center. The terminal voltage is the
cube root of the coil voltage; the mains and the coil current are the same. Star connec-
tions are denoted by the symbol Y. A star connection three phase motor for 400 V mains
voltage has a coil voltage of 230 V.
Fig. 4: Motor coil and connecting plate for high voltage
DANGER
Voltage-bearing elements
Danger to life from electric shock.
The electrical connection can be carried out only by trained and authorised electri-
cians.
Disconnect the power supply and secure it against being switched back on.
Ensure the system is adequately earthed.
NOTICE
Excess voltage!
Danger of destroying the motor.
Power connections must comply with local regulations. Voltage and frequency infor-
mation given on the motor rating plate must correspond to the mains voltage and fre-
quency values.
To protect the motor and supply cable in case of malfunction, mains fuse protection
must be implemented. Recommended: Type K slow blow circuit breaker.
WARNING
Danger of injury from moving parts!
After power failure or motor shutdown due to overheating, the motor may restart auto-
matically.
Secure the motor so that it cannot be switched on while any work is being performed
on the pump.
If necessary, dismantle the pump from the installation for inspection.
U1
V1
W1
L1
L2
L3
V2U2W2
V3U3
W3

14
Installation
Double Star Connection
Fig. 5: Connecting plate for low voltage
Checking the direction of rotation
The control of the direction of rotation is required for pumps with three-phase motors!
Remove the locking cap from the exhaust flange.
Switch the pump on briefly (from 2 to 3 sec.).
– Rotation must be in a clockwise direction in view of the shaft end of the motor (see
the arrow on the fan cover).
If the direction of rotation is incorrect: Swap two phase contacts at the connecting ca-
ble.
Fill up the operating fluid.
U1
V1
W1
L1
L2
L3
V2U2W2
V3U3
W3
NOTICE
Do not start with star/delta connection.
Always start motor directly.
CAUTION
Operating fluids may leak out!
If the direction of rotation is incorrect, there is a danger that operating fluids may leak at
the vacuum flange.
Always check the direction of rotation before filling in operating fluid.

Installation
15
Motor protection With motor protection switch
Suitable are protection switches with slow triggering characteristics. The drive motor can
have a power consumption that is higher than the rated current IN. According to DIN EN
60034-1 it is permissible to exceed the rated current IN1.5 times for a period of 2 min-
utes. The setting must permit the overload ability of the motor and can be found in the
following table.
Hena 26
Hena 41
Motor control system Frequency converter (valid for three phase motors)
Operation of rotary vane pumps with variable rotation speeds is possible in the mains fre-
quency range between 35 and 60 Hz. The start-up can use a ramp (run-up time: max.
30 s); the shutdown can occur directly.
Voltage [V] Frequency [Hz] Motor rating [kW] IN[A] I max [A]
220 ... 240 (1~) 50 1,0 4,8 40
190 ... 208 (3~) 50 1,0 2,4 20
380 ... 415 (3~) 50 1,2 4,8 40
220 ... 230 (3~) 60 1,2 2,4 20
440 ... 460 (3~) 60 1,1 7,0 19,2
Voltage [V] Frequency [Hz] Motor rating [kW] IN[A] I max [A]
190 ... 208 50 1,4 7,0 55,3
380 ... 415 50 1,4 3,5 28
220 ... 230 60 1,7 6,6 52
440 ... 460 60 1,7 3,3 26

16
Installation
5.5 Filling up the operating fluid
The type and amount of operating fluid should be visible on the pump's rating plate for
every rotary vane pump.
The delivery consignment for the standard pump contains sufficient operating fluid for
one filling. The use of other operating fluids requires prior authorisation from Pfeiffer Vac-
uum.
Permissible operating fluid
●P3 (standard operating fluid)
●Operating fluid for special applications on request
Filling up the operat-
ing fluid
Unscrew operating fluid filler screw 88.
Fill up with operating fluid to the middle of the sight glass.
– Filling quantity approx. 1,0 l of operating fluid.
Fig. 6: Filling up the operating fluid
Screw in operating fluid filler screw 88.
Close intake port valve (if present) or cover intake flange.
Start pump and run it for max. 5 minutes.
Switch off pump and wait until the operating fluid has collected in the separator box.
Check fill level: The correct fill level is between the markings on the sight glass.
– If the fill level drops below the "Min" marking, add operating fluid.
Open intake port valve.
NOTICE
Use approved operating fluids only!
The use of operating fluids that have not been approved by Pfeiffer Vacuum shall result
in a limited warranty. In such cases, it is not possible to guarantee that product-specific
performance data will be achieved.
Prior consultation is required before using other application-specific operating fluids.
83 Sight glass
88 Operating fluid filler
screw
95 Operating fluid drain
screw
88
83
95
Max.
Min.

Operation
17
6Operation
6.1 Before switching on
Check the operating fluid level in the sight glass.
Compare the voltage and frequency information on the rating plate with the mains volt-
age and frequency values.
Check that exhaust connection is free flowing (atmospheric pressure).
Protect the pump sufficiently from taking in contaminants by means of suitable precau-
tions (e.g. dust filters); if necessary, check operating fluid regularly or replace at short-
er intervals.
6.2 Switching on the pump
The pump can be switched on in any pressure range between atmospheric and
ultimate pressure.
The ideal operating condition of the pump is achieved during continuous operation. Cy-
clic operation is possible, but 10 cycles per hour should not be exceeded and the oper-
ating phase should always be longer than the downtime (non-operation time).
No specific measures are required when pumping dry gases. Due to the permanently
opened gas ballast unit, the final pressure that can be achieved by the pump is limited.
To achieve the lowest possible final pressures, you can mount a manual gas ballast valve
(accessories) to close off the system (see p. 18, chap. 6.3).
Switch on the pump with the vacuum flange closed and allow to warm up for 15 min-
utes.
Permissible operat-
ing conditions
WARNING
Danger of burns from exiting hot oil mist!
During operation, the operating fluid separator is filled with hot, pressurised oil mist.
Only operate the vacuum pump with the operating fluid filler screw securely fitted.
Open the blanking plugs on the separator only when the pump is switched off.
CAUTION
Hot surface!
Danger of burns if hot parts are touched. Depending on the operating and ambient con-
ditions, the surface temperature of the pump may rise above 70 °C.
In this case, use suitable finger guards.
NOTICE
Increased motor current draw (> rated current) !
With an intake pressure of about 300 h/Pa, the pump has the highest power require-
ment, which can increase even further under unfavorable operating conditions (e.g.
counter-pressure on exhaust side.
Limit the max. power consumption for 1.5 times the rated current for 2 minutes max.
(according to DIN EN 60034-1.
Type / Version Intake pressure for continu-
ous operation Intake pressure for intermit- tent operation
Hena 26/41
Operating fluid return via float
valve
< 800 hPa unlimited < 800 hPa unlimited

18
Operation
Operatingfluidreturn
via float valve The pumps are fitted with an operating fluid return as standard. If the operating fluid col-
lected in the operating fluid separator 75 reaches a definite level, the float valve opens
and the ejected operating fluid is returned to the pump’s intake flange.
6.3 Pumping condensable vapours
Should the process gases contain condensable gases, the rotary vane pump must be
operated with gas ballast (i.e. with an open gas ballast valve).
Gas ballast function The pumps have a gas ballast unit via which air is permanently taken in. A ball valve 440
for closing off the line can be fitted as an upgrade (see accessories).
The gas ballast valve is closed when turning to the right to position 0 and open when turn-
ing to the left to position 1. Intermediate settings are not possible.
Fig. 7: Gas ballast valve
NOTICE
The operating fluid return only works properly if the working pressure is < 800 hPa.
NOTICE
Bad final vacuum and damage to the pump!
Danger of condensation and corrosion due to exceeding the water vapour compatibility
during operation without gas ballast or in case of insufficient supply of flushing gas.
Only pump vapours when the pump is warm and the gas ballast valve is open.
When the process has been completed, allow the pump to continue running for
about 30 minutes with the vacuum flange closed and the gas ballast open for oper-
ating fluid regeneration purposes.
440 Ball valve 441 Sintered metal filter
“1”
“0”
440
441

Operation
19
6.4 Topping up the operating fluid
If the operating fluid has reached its minimum filling level, the operating fluid must be
topped up.
Filling up the operat-
ing fluid
Switch off the pump.
Unscrew operating fluid filler screw 88.
When the pump is at operation temperature, top up the operating fluid up to the "max."
marking.
Fig. 8: Filling up the operating fluid
Screw in operating fluid filler screw 88.
83 Sight glass
88 Operating fluid filler
screw
95 Operating fluid drain
screw
88
83
95
Max.
Min.

20
Operation
6.5 Switching off
The pump can be switched off in any pressure range.
HenaLine rotary vane pumps have an integrated non-return valve on the suction side.
This closes automatically when the pump is switched off and therefore prevents the re-
turn flow of gas and processing materials into the suction pipe.
Switch the pump off at the mains switch or disconnect from the mains in a secure man-
ner.
Vacuum chamber
venting
Maintaining the vac-
uum in the chamber
NOTICE
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
Vent the vacuum chamber within 30 s, regardless of the chamber size.
For a longer venting process, use an additional shut-off valve and shut off the intake
line after switching off the pump.
NOTICE
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
Because the safety valve of the pump is not suitable for longer-term sealing, install
an additional shut-off valve in the intake line.
Shut off the intake line immediately after switching off the pump.