Open

Great performances,
even in charging.

Open meets professional needs that require large charging capacities in hot, poorly ventilated or tropical countries. It is equipped with 4 front filling connections for high pressure hoses, an intuitive control panel and an electric motor. The pumping unit, chosen from the 4 most powerful, is exposed in the rear part of the structure to ensure a better cooling cycle. For longer filter life, the Tornado high pressure dryer is recommended. Available as optional: the Presec system for filter saturation control or the SAM system for multigas analysis and remote charging panel.

4-stage high pressure pumping unit.

  • Monobloc in aluminum,
  • Crankshaft in forged steel
  • forced lubrication on the 4th stage cylinder by gear pump
  • Oil filtration
  • Aluminum connecting rods
  • Main roller bearings
  • Roller connecting rod bearings
  • 1st, 2nd and 3rd stage cylinders in special cast iron
  • 4th stage cylinder in special treated steel.
  • Stainless steel intake and exhaust valves
  • Interstage cooling pipes in stainless steel
  • Separator after the 2nd, 3rd and 4th stage
  • Safety valves after each stage
  • Oil level sensor
  • Prepared for Hyperfilter filter system

Purification at the highest level.

Placed after the last compressor separator and before the pressure holding valve, the Hyperfilter purification system enables reliable treatment of the breathing air according to DIN EN 12021¹ when using original filter cartridges. The separator present between the 2nd and 3rd stage of the purification circuit allows to extract the greatest possible humidity. The filtering capacity with inlet air at 20 ° C and 200 bar is 4300 m³.

Electrical cabinet

  • ON / OFF switch with motor protection switch.
  • Digital electronic pressure switch that stops the compressor at the final pressure.
  • Drainage of all separators between the individual stages and also of the final separator during compressor operation
  • Timer for automatic condensate drain.
  • Integrated no-load start (automatic drain every time the unit is switched off).
  • 5 liter condensate collection tank, with silencer; capacity of about 3 liters, for the ecological disposal of condensate.
  • Interstage pressure gauges display the working pressure for the individual compression stages. This pressure information allows you to check the tightness of the valves (inlet and outlet) of each stage and to quickly identify potential sources of failure.

Chassis

Open frame with vertical development designed to facilitate maintenance operations. The oil level and drain reported outside, the control console equipped with inter-stage pressure gauges, the oil pressure gauge, the internal temperature indicator, the presence alarm and incorrect phase sequence, the lack alarm oil and the start, stop and manual condensate drain commands allow easy management and maintenance of the compressor.

Simplicity comes standard.

Imagine having a compressor capable of great performance and endowed with extraordinary solidity. What would all this be without absolute simplicity in managing it?
We believe that innovation is for this: to make everything simpler.

The highest air quality is the goal of a Coltri compressor.

Air purity and quality are two essential characteristics of our compressors. The air you breathe from Coltri compressors complies with the EN 12021: 2014 standards: this is why you can work, have fun and exercise with them in absolute safety.

Standard equipment

4 Filling connections of your choice of DIN 232, DIN 300 or INT/YOKE 232 bar
4 filling hoses of 1.2 m in length
Pressure maintenance valve
Interstage control gauges
Double PED certified Hyperfilter filter system
Cabin internal temperature with automatic switch-off
Automatic condensate drain
Automatic direction of rotation control
Electronic pressure switch with automatic shutdown
Oil level control with automatic shutdown
Oil pump
Automatic condensate drain with conveyor system in the tank
Frame color Black RAL 9005

Technical data

Type of gas

Breathing air (EN 12021) – Nitrox 40% max O2 – Helium – Nitrogen

Intake pressure

Atmospheric max 300 millibars

Nominal pressure

250 bar / 330 bar / 360 bar

Working pressure

250 bar / 330 bar / 360 bar

Max working pressure

420 bar

Permissible ambient temperature range

-10° C ÷ +40° C

Permissible altitude

0 ÷ 1.500 m SLM

Max permissible tilt

15°

Design

Cabinet aperto

Operating voltage, standard

400 V; 50 Hz

Other operating voltage

230 V 50 hz / 440 V 60 hz / 230 V 60 hz

Oil

Synthetic Coltri Oil ST 755

Oil change interval

Every year / 1,000 h

Frame

Steel thickness 1.5 mm – color RAL 9005 – Powder coating – scratch-resistant

Compressor

Charging rate

Measured during 10 liters cylinder filling from 0-200 bar tolerance +/- 5% at + 20° C ambient temperature.
450 ET

450 l/min
27 m3/h
15.9 CFM

550 ET

550 l/min
33 m3/h
19.4 CFM

650 ET

650 l/min
39 m3/h
23 CFM

750 ET

750 l/min
45 m3/h
26.5 CFM

Purification system

2 Hyperfilter

Cooling air flow, min.

450 ET

4.050 m3/h

550 ET

4.820 m3/h

650 ET

4.820 m3/h

750 ET

5.590 m3/h

Weight

Standard model. Weight and dimensions may vary depending on accessories.
450 ET

356 kg
784 lb

550 ET

361 kg
796 lb

650 ET

365 kg
804 lb

750 ET

373 kg
943 lb

Dimensions

(W x D x H)

90,5 x 105,2 x 153 cm
35.6 x 41.4 x 60.2 in

Motor

Power

450 ET

7.5 kW
10 Hp

550 ET

9 kW
12.5 Hp

650 ET

11 kW
15 Hp

750 ET

15 kW
20 Hp

Type

450 ET

Three-phase electric

550 ET

Three-phase electric

650 ET

Three-phase electric

750 ET

Three-phase electric

Operating voltage/frequency

Different voltage / frequency available on request.
450 ET

400 V, 50 Hz

550 ET

400 V, 50 Hz

650 ET

400 V, 50 Hz

750 ET

400 V, 50 Hz

Rated current

450 ET

13.2 A

550 ET

13.2 A

650 ET

13.2 A

750 ET

13.2 A

Speed (RPM)

450 ET

2.870 1/min

550 ET

2.880 1/min

650 ET

2.910 1/min

750 ET

2.920 1/min

Protection class

IP55 (TEFC)

The available models of Open

(Non-standard models available upon request)

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