Mixer size
Minimum speed
(rpm)
a
Maximum
speed (rpm)
60/75 - 120/150
50
450
120/190
-
210/350
50
350
SMMS 85
50
1 200
SMMS 120
50
1 800
Sanimixer 500
50
450
Sanimixer 3 000
- 30 000
50
350
n
Table 4
Minimum and maximum speed for different
sizes of mixers.
a
Applies to AC motors
Factory-supplied Sterimixer/Sanimixer motors are of
the 4-pole AC (alternating current) type (exception 60/75
is equipped with 2-pole AC motor). They are coupled
to gear boxes with reduction 5:1 or 7.5:1 depending on
mixer size and type of drive unit (standard IEC, IEC ATEX,
NEMA XP, NEMA Stainless Steel, etc). Approximate
speeds for motor/gearbox combinations are listed in table
5.
4. OPERATION
WARNING:
The Sterimixer/Sanimixer is only to be op-
erated when mounted in a vessel, thus avoiding impact
damage and loose objects from becoming entangled in
the rotating parts.
CAUTION:
Do not run the Sterimixer/Sanimixer dry.
4.1. Allowed operating temperature range
Component
Temperature range
Impeller
0 - 140
◦
C
(32 - 284
◦
F)
a
Bearing unit
0 - 140
◦
C
(32 - 284
◦
F)
Drive unit ambient temperature
All sizes
-25 - +40
◦
C
(-13 - +104
◦
F)
a
The permanent magnets in the impeller withstand temperatures up to
+225
◦
C (autoclave cleaning)
4.2. Allowed pressure range
Weld plate size
Design pressure range
All sizes
-1 - +7 bar g
(-14.5 - +101.5 psig)
4.3. Chemical compatibility
The impeller and bearing are not to be exposed to strong
chemicals. Nominal pH range for tungsten carbide (TC)
n
Figure 6
Sterimixer/Sanimixer should never be allowed
to run dry.
n
Figure 7
The bearing lubrication principle of the SMA
type impeller.
bearings is 2 - 14 but silicon carbide (SiC) bearings can be
used in a pH range from 0 to 14. In addition to these mate-
rials Steridose offers Dri-amond™ bearings. Dri-amond™
bearings feature a pure crystalline diamond film coating
that is deposited in the silicon carbide structure. This
results in a lower coefficient of friction and greater surviv-
ability under dry-running conditions.
Refer to table 6 or contact Steridose for further assis-
tance.
4.4. Operational limits
4.4.1. Lubrication principle
During operation of the Sterimixer/Sanimixer a liquid
film of the process fluid is generated between the male
and female bearing, aided by the rotation of the impeller,
providing cooling and lubrication of the bearings. In addi-
tion to this, for the SMA-type impeller, a negative pressure
is created on the backside of the impeller wings, the pro-
cessed liquid will be transported from the inside of the
impeller through the holes to the outside of the impeller.
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Installation & Operation
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