► Keep lines and cables away from hot surfaces (> 70 °C).
► Never fill or operate the unit with cleaning agents or cleaning agent residues.
► Do not carry out your own conversions or modifications on the unit.
► Observe the unit protection class prior to installation or operation in other environments.
► Provide suitable touch protection, if the surface temperature exceeds 70 °C.
2.4 Limits of use of the product
Parameter
Hena 401, Hena 631
Installation location
● Indoors, protected against:
─ dust deposits
─ falling objects
─ fire-fighting water
● Outdoors, protected against:
─ falling objects
─ direct influence of weather such as rain, splash water, strong
drafts and sunlight
─ fire-fighting water
─ lightning strike
Installation altitude
max. 1000 m above sea level
At installation heights > 1000 m above sea level, the rated power of the
motor must be reduced or the ambient temperature limited due to in-
creased heating of the vacuum pump.
Orientation
Horizontal
permissible angle of incli-
nation
± 1 °
Ambient temperature with
mineral-based operating
fluids (P3)
5+ °C to +35 °C
Ambient temperature with
synthetic-based operating
fluids (D1)
+5
℃
to +40
℃
Relative air humidity
max. 85%
Pumped medium intake
temperature, max.
+80 °C
Permissible operating pres-
sure range during continu-
ous operation
< 800 hPa
Exhaust pressure
Atmospheric pressure
Tbl. 3:
Limits of use of the product
2.5 Proper use
► Use the vacuum pump for vacuum generation only.
► Use the vacuum pump only for pumping clean air or other non-aggressive, non-poisonous and
non-explosive gases.
► Convey media with a greater density than air only after prior consultation with Pfeiffer Vacuum.
Avoid high thermal and mechanical loading of the rotary vane pump and the drive.
► When pumping media with an oxygen concentration level of ≥ 21 %, only use perfluorinated, syn-
thetic oils (F4, F5, A113) as operating fluid.
► Adhere to the installation, commissioning, operating, and maintenance instructions.
► Do not use any accessory parts other than those recommended by Pfeiffer Vacuum.
2.6 Foreseeable improper use
Improper use of the product invalidates all warranty and liability claims. Any use that is counter to the
purpose of the product, whether intentional or unintentional, is regarded as misuse, in particular:
● Pumping of corrosive media
● Pumping radioactive media
Safety
15/70
