Mark III Silent

Control is everything.

Designed with control systems that allow effective monitoring of operations: interstage pressure, oil level, cabin internal temperature and direction of rotation detector.

3-stage high pressure pumping unit.

  • Monobloc in aluminum,
  • Crankshaft in forged steel
  • Splash lubrication
  • Forged aluminum connecting rods
  • Main roller bearings
  • Roller connecting rod bearings
  • 1st and 2nd stage cylinders in aluminum with hard nicasil coating
  • 2nd and 3rd stage slide guide cylinders in aluminum with hard nicasil coating
  • 3rd stage cylinder in special treated steel.
  • Stainless steel intake and exhaust valves
  • Interstage cooling pipes in stainless steel
  • Separator after the 2nd and 3rd stage
  • Safety valves after each stage
  • Maxifilter filter system
  • Oil level sensor

Maxifilter motor and purification system

One of the fundamental parts of the compressor: the motor transfers the motion to the pumping unit through the belt. On this model is available the single-phase or three-phase electric motor from 4 to 5, 5 kW.

The Maxifilter purification system enables reliable treatment of the breathing air according to DIN EN 12021¹ when using original filter cartridges. Placed after the last compressor separator and before the pressure maintenance valve, it has the separator after the 2nd and 3rd stage to create a first, fundamental barrier against humidity. The filtering capacity with inlet air at 20 ° C and 200 bar is 620m³.

Electrical cabinet

  • ON / OFF switch with motor protection switch.
  • Electromechanical 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

Silenced cab chassis designed and built to facilitate maintenance operations. The tilting motor-holder plate ensures constant V-belt tension. Compressor management and maintenance are facilitated by important devices and tools: the oil level and drain shown outside, the control console equipped with inter-stage pressure gauges, the internal temperature indicator, the presence alarm and incorrect phase sequence, the oil lack alarm and the start stop and manual condensate drain commands.

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

2 Cylinder connections to choose from DIN 232, DIN 300 or INT / YOKE 232 bar
2 whips 1.2m long
Pressure maintenance valve
Interstage control gauges
Maxifilter filter system
Cabin internal temperature with automatic switch-off
Automatic direction of rotation control
Pressure switch with automatic shutdown
Oil level control with automatic shutdown
Automatic condensate drain with conveyor system in the tank
Frame color Blue RAL 5015

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

232 bar / 300 bar / 330 bar

Max working pressure

232 bar (elettrico monofase) – 420 bar (elettrico trifase)

Permissible ambient temperature range

-10° C ÷ +40° C

Permissible altitude

0 ÷ 1.500 m SLM

Max permissible tilt

Design

Cabinet insonorizzato con fonoassorbente

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

1 year / 1,000 h

Frame

Steel thickness 1.5 mm – color Blue RAL 5015 – Powder coating – scratch-resistant

Noise

LpA 65 dB

Compressor

Charging rate

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

210 l/min
12.6 m3/h
7.4 CFM

270 EM

270 l/min
16.2 m3/h
9.5 CFM

235 ET

235 l/min
14.1 m3/h
8.2 CFM

315 ET

315 l/min
18.9 m3/h
11.1 CFM

Purification system

Maxifilter

Cooling air flow, min.

210 EM

1.240 m3/h

270 EM

2.180 m3/h

235 ET

1.440 m3/h

315 ET

2.180 m3/h

Weight

Standard model. Weight and dimensions may vary depending on accessories.
210 EM

162 kg
357 lb

270 EM

168 kg
370 lb

235 ET

162 kg
357 lb

315 ET

168 kg
370 lb

Dimensions

(W x D x H)

103 x 73 x 91 cm
40.5 x 28.7 x 35.8 in

Motor

Power

210 EM

4 kW
5.5 Hp

270 EM

5,5 kW
7.5 Hp

235 ET

4 kW
5.5 Hp

315 ET

5,5 kW
7.5 Hp

Type

210 EM

Single-phase electric

270 EM

Single-phase electric

235 ET

Three-phase electric

315 ET

Three-phase electric

Operating voltage/frequency

Different voltage / frequency available on request.
210 EM

230 V, 50 Hz

270 EM

230 V, 50 Hz

235 ET

400 V, 50 Hz

315 ET

400 V, 50 Hz

Rated current

210 EM

13.2 A

270 EM

13.2 A

235 ET

13.2 A

315 ET

13.2 A

Speed (RPM)

210 EM

2.800 1/min

270 EM

2.850 1/min

235 ET

2.850 1/min

315 ET

2.840 1/min

Protection class

IP55 (TEFC)

Mark III Silent models available

(Non-standard models available upon request)

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