Atlas Copco ZT 90 (FF) Oil-Free Rotary Screw Air Compressor

Description

The Atlas Copco ZT 90 is the 90 kW air-cooled machine of the ZR/ZT 55-90 oil-free family, a fixed-speed compressor that brings certified oil-free air to plants without a cooling water circuit. The compression chambers run completely free of oil, and the package carries the ISO 8573-1 CLASS 0 (2010) certification verified by TÜV.

The Full Feature build integrates the IMD adsorption dryer inside the same package. Three pressure versions at 50 Hz and three at 60 Hz cover free air delivery from 211.3 to 261.3 l/s, and a high ambient temperature variant takes intake air up to 50 degrees Celsius.

Where the ZT 90 Sits in the Oil-Free Range

The ZR/ZT 55-90 family serves the plants whose oil-free demand has outgrown the smaller packages but has not yet reached the ZR/ZT 110-275 class, and the ZT 90 tops this family with 90 kW of installed motor power. The letter Z marks the oil-free architecture: the precision-cut rotors never touch, so the compression chamber needs no lubrication and no oil can reach the air stream. Where the demand profile swings, the ZT 90 VSD of the same rating adjusts its speed continuously instead of loading and unloading.

Atlas Copco pioneered oil-free air technology over sixty years and became the first manufacturer awarded CLASS 0 certification. The ZT 90 carries that standard into the air-cooled 90 kW class, and the package arrives as a complete all-in-one installation: place it on a flat floor, connect the power line and the air outlet, and push the start button.

Air Cooling and the Full Feature Concept

Two names describe the branches of the ZT 90, and each adds one fact:

• Standard — the compressor package delivers oil-free air for networks with external air treatment downstream, with the air-cooled design rejecting the heat of compression into the machine room.
• FF — Full Feature: the package integrates the IMD adsorption dryer, so dry air leaves the machine directly with no external energy spent on regeneration.

The ZT 90 is offered as the ZT 90 – 7.5, – 8.6 and – 10 bar versions at 50 Hz, and as the ZT 90 – 7.25, – 9 and – 10.4 bar versions at 60 Hz, each with a high ambient temperature (HAT) variant on the 8.6 bar band. Every version combines with both branches.

Technical Specifications of the ZT 90

The table below condenses the ZT 90 into its headline figures:

Rated Data at 50 Hz

Unit performance is measured according to ISO 1217, annex C, edition 4 (2009). The 7.5 bar version is measured at 7 bar, the 8.6 bar version at 8 bar and the 10 bar version at 9 bar. The HAT variant carries the same hardware rating with a maximum intake and cooling air temperature of 50 degrees Celsius:

The 7.5 bar version leads the series at 236.0 l/s (500 cfm), and the 10 bar band delivers 211.3 l/s (448 cfm). The installed motor power stays at 90 kW across all versions, and the sound pressure level holds at 76 dB(A) at the work station.

Rated Data at 60 Hz

The 60 Hz versions cover three bands from 7.25 to 10.4 bar(e) with the HAT variant on the 8.6 bar band, and the motor is rated at 120 hp. The measurement pressures follow the same rule as at 50 Hz:

The 7.25 bar version tops the whole series at 261.3 l/s (554 cfm). The noise level is the A-weighted emission sound pressure level at the work station, measured according to ISO 2151: 2004 using ISO 9614/2, with a total uncertainty value of 3 dB(A).

Dimensions and Weight

The Full Feature package of the ZT 90 takes 700 mm more length than the Standard build, the only footprint difference in the family:

The Standard build measures 2,180 mm in length, and the integrated dryer of the Full Feature stretches the package to 2,880 mm. No foundations are required for either branch, and the package installs directly on the flat floor of the compressor room.

Class 0 Air Purity, Verified by TÜV

The ZT 90 belongs to the first compressor range in the industry certified oil-free according to ISO 8573-1 CLASS 0 (2010). TÜV type-tested the range with the most rigorous methodologies available, measuring all possible oil forms across a range of temperatures and pressures, and found no traces of oil at all in the output air stream. CLASS 0 is the most stringent class of the standard: the total oil concentration is as specified by the equipment user or supplier and more stringent than class 1.

That certification is what makes the ZT 90 the default choice where a single trace of oil costs a batch: food and beverage lines running fermentation, packaging and filling, electronics plants cleaning chips and boards, petrochemical operations in extreme heat and humidity, and pharmaceutical production from tablet coating to bottling.

The Air-Cooled Design

Air cooling defines the ZT branch of the family. A stainless steel pre-cooler with fins handles the heat exchange with excellent transfer and easy access for cleaning, and low-noise, low-energy radial cooling fans reject the heat into the machine room. Because no cooling water circuit is needed, the ZT 90 installs where the water-cooled ZR 90 cannot: laboratory buildings, workshops and remote sites that run oil-free air on a power line alone.

Built for High Ambient Temperatures

The ZT 90 is the branch of the family that carries the high ambient temperature version, required when the ambient temperature rises above 40 degrees Celsius. The HAT variant of the 8.6 bar band is rated for a maximum intake and cooling air temperature of 50 degrees Celsius, which keeps certified oil-free production running in hot climates and poorly ventilated machine rooms where a standard package would have to derate.

Full Feature: The Integrated IMD Adsorption Dryer

In the ZT 90 Full Feature, the IMD adsorption dryer eliminates the moisture before it enters the air net. The dryer uses the heat of the compressor for regeneration, so no external energy is needed to dry the air, and the savings against a conventional dryer are large. The pressure drop through the dryer is minimal, which cuts the operating cost again, and the whole drying function lives inside the compressor package instead of beside it.

Control and Monitoring

The Elektronikon unit controller runs the compressor and the integrated dryer from one control system. The high-resolution color display shows the running conditions with clear icons and intuitive navigation, monitors the maintenance status, and raises pro-active service indications, alarms for malfunctions and safety shutdowns. The display supports 31 different languages, and built-in remote control and notification functions come as standard with ethernet-based communication.

SMARTLINK and Options

The option list of the ZT 90 tailors the package to the plant:

• Monitoring and protection bundle — anti-condensation heaters, SPM bearing monitoring and PT 1000 sensors in the windings and bearings.
• SMARTLINK — online data monitoring of the compressed air system with warning indications and maintenance scheduling.
• PDP sensor and low load kit — Full Feature options for dew point verification and stable part-load running.
• High ambient temperature version — the air-cooled branch option for ambient temperatures above 40 degrees Celsius.
• Anchor pads, wooden case packaging, material certificates, test certificate and witnessed performance test — for controlled installation and documented acceptance.
• Teflon-free elements and purge kit for dry air during standstill — for specified coating materials and tropical environments.

Applications of the ZT 90

Food and beverage plants run the ZT 90 for fermentation, aeration, transportation, filling and capping, where the CLASS 0 certification removes the contamination risk from the audit trail. Electronics manufacturers use the clean, dry air for removing microscopic debris from chip and board surfaces, and petrochemical sites value the machine’s ability to run in extreme temperatures and humidity conditions around the clock.

Pharmaceutical production completes the picture, from fermentation and tablet coating to packing and bottling, where 100 percent oil-free air protects both the process and the brand. Where the demand profile fluctuates heavily, the plant adds the ZT 90 VSD of the same rating next to this fixed-speed machine, and growing networks step up to the ZR/ZT 110-275 class above.

Service and Support Around the ZT 90

The ZT 90 is built for long overhaul intervals, few service interventions and minimal maintenance cost, and every machine is tested before delivery to ensure it meets the specifications. A global service operation with field service engineers across 160 countries backs the installed base, and genuine Atlas Copco parts keep the package at its rated performance.

Seadweer supplies genuine Atlas Copco spare parts and service kits for the ZT 90 and its Full Feature branch. Send us the compressor model together with the parts you need, and the correct items are confirmed with the quotation in one pass.

FAQ

What does the ZT 90 deliver at 8.6 bar?

The 8.6 bar version delivers 223.3 l/s at 50 Hz, which equals 13.4 m³/min or 473 cfm, measured at 8 bar according to ISO 1217 annex C, edition 4 (2009). The HAT variant of the same band reads 211.4 l/s (448 cfm) for 50 degrees Celsius intake air.

Is the ZT 90 an air-cooled machine?

Yes. The ZT letter marks the air-cooled branch of the ZR/ZT family: a stainless steel pre-cooler with fins and low-noise radial fans reject the heat, and no cooling water circuit is required. The water-cooled equivalent is the ZR 90.

How oil-free is the air?

The ZT 90 carries the ISO 8573-1 CLASS 0 (2010) certification verified by TÜV, the most stringent class of the standard. TÜV testing found no traces of oil at all in the output air stream across the tested range.

What does the Full Feature build add?

FF integrates the IMD adsorption dryer inside the compressor package. The dryer regenerates with the heat of the compressor, so no external energy is needed, and the package grows from 2,050 kg to 2,650 kg and from 2,180 mm to 2,880 mm in length.

What is the HAT version for?

HAT stands for the high ambient temperature variant, rated for a maximum intake and cooling air temperature of 50 degrees Celsius. It is required when the ambient temperature rises above 40 degrees Celsius, and the ZT branch is the one that carries it.

How loud is the ZT 90?

The sound pressure level at the work station reads 76 dB(A) on every version at both frequencies. The value follows ISO 2151: 2004 with the ISO 9614/2 method and carries a total uncertainty value of 3 dB(A).