EFFICIENT LINE

Mark III Silent

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Control is everything

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

Quiet. Powerful. Smart.

The model Mark Ⅲ Silent is designed with control systems that enable effective monitoring of operations: interstage pressure, oil level, internal cabin temperature, and direction of rotation detector.

Equipped with two high-pressure hose connections, it is equipped with electric motors and powerful pumping units, automatic condensate drainage, and electrical panel for managing automatic compressor shutdown. Available options include remote charging panel.

Watch it closely

Simplicity comes as standard

Imagine having a compressor capable of great performance and endowed with extraordinary robustness. What would all this be without absolute simplicity in operating it? We believe that’s what innovation is for: to make it simple.

And now for all the details

3-stage high pressure pumping unit

Aluminum monoblock,
Forged steel gooseneck
Flutter lubrication
Forged aluminum connecting rods
Bench roller bearings
Connecting rod roller bearings
1st and 2nd stage cylinders made of aluminum with hard nicasil coating
Skid guide cylinders of 2nd and 3rd stage made of aluminum with hard nicasil coating
3rd stage cylinder made of treated special steel.
Stainless steel intake and exhaust valves
Stainless steel interstage cooling tubes
Separator after the 2nd and 3rd stages
Safety valves after each stage
Filter system Maxifilter
Oil level sensor

Electric motor

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

Purification system Maxifilter

The purification system Maxifilter enables reliable treatment of breathing air according to DIN EN 12021 when using original filter cartridges. Placed after the compressor 2nd and 3rd stage separator and before the pressure maintenance valve to create a first fundamental barrier against moisture. Filter capacity with inlet air at 20°C and 200 bar is 890 m³.

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 individual stages and also of the final separator during compressor operation
Timer for automatic condensate drainage device.
Integrated no-load startup (automatic discharge each time the unit is turned off).
Condensate collection tank 5 liters, with silencer; capacity about 3 liters, for environmentally friendly disposal of condensate.
Interstage pressure gauges display the operating pressure for individual compression stages. This pressure information allows the tightness of the valves (inlet and outlet) of each stage to be checked and potential sources of failure to be quickly identified.

Frame

Silenced cab chassis designed and built for easy maintenance operations. Tilting motor carrier plate ensures constant V-belt tension.

Compressor operation and maintenance are facilitated by important features and tools: oil level and drain reported externally, control console equipped with inter-stage gauges, internal temperature indicator, presence and wrong phase sequence alarm, oil shortage alarm, and run stop and manual condensate drain controls.

3-stage high pressure pumping unit

Aluminum monoblock,
Forged steel gooseneck
Flutter lubrication
Forged aluminum connecting rods
Bench roller bearings
Connecting rod roller bearings
1st and 2nd stage cylinders made of aluminum with hard nicasil coating
Skid guide cylinders of 2nd and 3rd stage made of aluminum with hard nicasil coating
3rd stage cylinder made of treated special steel.
Stainless steel intake and exhaust valves
Stainless steel interstage cooling tubes
Separator after the 2nd and 3rd stages
Safety valves after each stage
Filter system Maxifilter
Oil level sensor

Electric motor

Purification system Maxifilter

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 individual stages and also of the final separator during compressor operation
Timer for automatic condensate drainage device.
Integrated no-load startup (automatic discharge each time the unit is turned off).
Condensate collection tank 5 liters, with silencer; capacity about 3 liters, for environmentally friendly disposal of condensate.
Interstage pressure gauges display the operating pressure for individual compression stages. This pressure information allows the tightness of the valves (inlet and outlet) of each stage to be checked and potential sources of failure to be quickly identified.

Frame

Silenced cab chassis designed and built for easy maintenance operations. Tilting motor carrier plate ensures constant V-belt tension.

Highest air quality is the goal of a Coltri compressor

Air purity and quality are two indispensable features of our compressors. The air you breathe from Coltri compressors complies with EN 12021:2014 standards: that’s why with them you can work, have fun, practice in absolute safety.

Purification System Maxifilter

The Maxifilter is a high-performance purification system designed for use with high-pressure compressors intended for the production of breathing air. It uses a combined molecular sieve and activated carbon filter cartridge, ensuring effective removal of moisture, oil vapors, and other contaminants.

This system ensures that the compressed air meets the standards required for underwater, industrial and emergency use, offering maximum breathing safety and reliability.

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Featured on Efficient Line compressors

Standard Equipment

2 Cylinder connections of your choice of DIN 232, DIN 300 or INT/YOKE 232 bar

2 Filling hoses 1.2 m long

Pressure holding valve

Interstage control manometers

Filter system Maxifilter

Inside cabin temperature with automatic shutdown

Automatic rotation direction control

Pressure switch with automatic shutdown

Oil level control with automatic shutdown

Automatic condensate drain with conveying system into the canister

Frame color Black RAL 9005

Technical specifications.

Type of gas

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

Suction pressure

Atmospheric max 300 millibars

Pressure rating

250 bar / 330 bar / 360 bar

Operating pressure

232 bar / 300 bar / 330 bar

Max working pressure

232 bar (single-phase electric) – 420 bar (three-phase electric)

Allowable temperature range

-10° C ÷ +40° C

Allowable altitude range

0 ÷ 1,500 m SLM

Maximum allowed inclination

6°

Design

Soundproof cabinet with sound absorber

Operating voltage, standard

400 V; 50 Hz

Other operating voltages

On three-phase electric motors at 60 hz power (kW / hp) increase by 20%.

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 – color Black RAL 9005 – Powder coated – scratch resistant

Compressor

Pump group flow rate

Measured while filling a 10-liter cylinder from 0-200 bartolerance +/- 5% at + 20 °C room 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

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. Dimensions and weight 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

Noisiness

210 EM

270 EM

235 ET

LpA 73,2 dB

315 ET

LpA 76,6 dB

Engine

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

Engine type

210 EM

Elettrico monofase

270 EM

Elettrico monofase

235 ET

Elettrico trifase

315 ET

Elettrico trifase

Operating voltage/frequency

Different voltage and frequency available upon 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

Engine RPM (RPM)

210 EM

2.800

270 EM

2.850

235 ET

2.850

315 ET

2.840

Protection class

IP55

Compatible Accessories

Discover the options designed for your new compressor