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Series HST 2500

Sulzer turbocompressor HST 2500

Single-stage radial centrifugal compressor for absolutely oil-free supply of air. The turbocompressor featuring variable speed control for continuously variable power optimization according to the changes in inlet temperature and differential pressure.


  • Integrated high speed electric motor
  • Frequency converter
  • Total oil-free magnetic bearings
  • Blow-off valve
  • Local control
  • All safety control required for monitoring
  • Sound isolation enclosure
  • All mounted on a common base plate
  • Accessories for inlet/outlet (as options)

High speed electric motor

Air cooled variable speed high frequency electric motor. The impeller and the motor cooling fan are mounted directly to the motor shaft. Vertically mounted motor with magnetic bearings and variable rotation speed.
Frequency converter In-built frequency converter for variable motor speed control and optimal efficiency at all operation points. Start-up with soft start function. Including Rfi-filter that filters the radio frequency interference emitted by the frequency converter.


Impeller shaped from a solid forged piece of DURAL Aluminium alloy on a numerical machining center in CAM technology. Impeller design with 3 dimensional shaped blades, individually optimized to the design range of the compressor.

Magnetic bearings

Two radial bearings with 8 pole magnets each and two axial magnetic bearing with 2 pole magnets each and continuous rotor position measurement controlled by active magnetic bearing controller. Including Rfi-filter.


  • Machinery Directive (MD), 98/37/EC
  • Low Voltage Directive (LVD), 2006/95/EC
  • Electromagnetic Compatibility (EMCD), 89/336/EEC + 93/31/EEC + 93/68/EEC

Product has been designed and manufactured to be connected to industrial network in accordance with EN61800-3 standard. (EMC product standard for adjustable speed electrical power drive system).

Test run

Performance test and acceptance according to ISO 5389 will be performed on our test stand and attested.

The design values of the performance table according the contract must be within a manufacturing tolerance of ± 2% and a measuring tolerance of ± 2%.


  • No mechanical contact between surfaces
  • No friction
  • No wearing
  • No oil lubrication
  • Vibration free operation
  • Continuous rotor balancing monitoring

Compressor control


Analog and Digital I/O as standard

Profibus or Modbus connection (as an option)

Monitoring values

Alarm codes

Fault codes

Operation parameters

Magnetic Bearing Controller MBC-12

Remote control

Surveillance via modem (as an option)

Air quality

Chemical vapours according

to  IEC 721-3-3

Ave. / Max 


Sulphur dioxide (SO2
0.3 / 1.0
Hydrogen sulphur (H2S)
0.1 / 0.5
Chlorine (Cl)  0,1/0.3
Hydrogen chlorine (HCl) 0.1 / 0.5
Hydrogen fluoride (HF) 
0.01 / 0.03
Ammonia (NH3)
1.0 / 3.0
Ozone (O3)
0.05 / 0.1
Nitrogen oxides (NOx)
0.5 / 1.0

Compressor data


HST 2500-1-L

HST 2500-1-H HST 2500-2-L HST 2500-2-H
Air flow range [Nm³/h] ~1000-3400 ~1000-3700 ~700-2400 ~700-2500
Pressure rise [kPa] 40-65 60-85 80-105 100-125
Max. noise level [dB(A)] 69 69 73 72
Input power [kW] 69 83 97 110
Max. current (400 V) [A] 112 135 157 179
Power supply [V] 380-690 380-690 380-690 380-690
Auxiliary power [kW] 1 1 1 1
Auxiliary current [A] 10 10 10 10
Auxiliary supply [V] 380-500 380-500 380-500 380-500
Input frequency [Hz] 50/60 50/60 50/60 50/60
Protection class - with FAC









Thermal protection 2xPt100 2xPt100 2xPt100 2xPt100

*1) Noise values are valid with inlet cone insulation (ICI) and outlet cone insulation (OCI).