Coltri HD Open 750 ET — stationary breathing-air compressor (3-phase)

The Coltri HD Open 750 ET is a stationary high-pressure compressor from the HD Open series with the highest cylinder-filling output — 750 l/min (45 m³/h). Built for intensive, continuous operation, including in poorly ventilated rooms and tropical climates. The compressor block is located at the rear of the housing, which improves cooling, while 4 front connections allow several cylinders to be filled at once. Multi-stage filtration (dual Hyperfilter) provides breathing air to EN 12021. Options: Tornado high-pressure dryer, Presec filter-saturation monitoring system and the S.A.M. multi-gas analysis system with a remote filling panel.

Note: The HD Open series covers the 450/550/650/750 ET variants (motor power 7.5 / 9 / 11 / 15 kW). The 750 ET version has a 15 kW motor and runs at 2920 rpm. Use Coltri ST 755 synthetic oil.

Key features

• Highest output in the series — 750 l/min (45 m³/h).
• Three-phase electric motor, 15 kW, 400 V/50 Hz, IP55.
• Working pressure 230 / 330 bar; air to EN 12021.
• 4 front connections (DIN 232/300, INT/YOKE 232) and 4 hoses of 1.2 m.
• Compressor block at the rear of the housing — better cooling; operation in demanding conditions.
• Dual Hyperfilter, hour meter, thermostat, automatic condensate drain, auto-stop.
• Options: Tornado dryer, Presec system (filter saturation), S.A.M. (multi-gas analysis).

Technical specifications

Applications

Large filling centres, dive bases, RPE workshops and units with the highest demand — intensive, continuous filling of SCBA and diving cylinders.

Frequently asked questions (FAQ)

What is the output of the HD Open 750 ET?

750 l/min, i.e. 45 m³/h — the highest in the HD Open series, for intensive cylinder filling.

What power supply does it require?

A three-phase 15 kW motor, 400 V / 50 Hz (protection class IP55).

How do the 450/550/650/750 ET variants differ?

In motor power and output: 7.5 kW (450), 9 kW (550), 11 kW (650) and 15 kW (750 ET).

Brand and service

SafeTech — supply, selection, servicing and inspection of breathing-air compressors (including Coltri, Dräger, Lenhardt & Wagner): filling of SCBA and diving cylinders, filtration and air quality control to EN 12021. Suchy Dwór near Gdynia, service throughout Poland.

Why SafeTech

Availability and service — Gdynia and the Tri-City

Coltri HD Open 750 ET — stationary breathing-air compressor (3-phase) — sales, selection, calibration and service in Gdynia (Suchy Dwór, on the border of Gdynia and the Kosakowo municipality). We serve the Tri-City (Gdańsk, Sopot, Gdynia), Rumia, Reda, Wejherowo, the Pomeranian Voivodeship and all of Poland. Ask us about pricing and availability.