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Air supply

REVO air filter system diagram

The mean air consumption is 40 l/minute.

Air filter maintenance

WARNING: It is vital that the supplied air filters are used for REVO and that the filter unit is maintained to the manufacturer's specification. Failure to comply with the specification will result in permanent damage to the REVO head and may require replacement at full cost, as the warranty will be invalidated.

Maintaining air quality

1. Ensure the air provided to the filtration system meets the specification given.

Incoming air supply specification:

Air pressure

5 bar - 8.5 bar*

Air consumption

Up to 50 litres per minute**


Class 4

Particle size

15 μm

Dirt concentration

8 mg/m³

Dew point

+3 °C


5 mg/m³

*NOTE: The exact values are dependent on the inherent characteristics of the air pipe between the air filters and the REVO head. Please ask the installer for the specification.

If the air pressure falls outside the range given, the head metrology results will be affected.

It is important that the air supply to the head is maintained while the head is powered as the air supplies the bearings and provides air for thermal management.

**NOTE: The mean value is 40 l/minute for normal build, with a spread of 37 - 43 l/minute. The test limit is set at 50 l/minute.

2. Regularly monitor the dew point indicator (see image below) and follow the instructions given in the table.

Maintenance of the REVO air filters

For more information please visit the air filtration manufacturer's website and search for IDG5 filters. (Please refer to 'Air filter service kits' section below for details on air filter service kit part numbers).

Dew point indications and maintenance instructions

Grain colour




NOTE: The grains may be pink on delivery and can take up to 1½ hours to turn blue when air is connected.

Normal operation.

No action required.

Pink, white or brown

NOTE: If the grains are brown, then both indicator and membrane must be replaced.

Water and oil flow into membrane air dryer.

1. Check and replace filters if necessary.
2. Check condition of inlet air for excess oil or water.

Pink or white

Input air temperature is too high.

Lower input temperature. Install in-line air coolers if necessary.

Pink or white

Purging air exit obstructed.

Check outlet of air purge port.


Membrane dryer near end of useful life.

Replace dew point checker.

Grains crushed

Water flow into membrane air dryer.

Replace dew point checker.

NOTE: Allow a minimum of 1 hour from start of air flow for the dew point indicator to change colour.

Air filter service kits

The Renishaw filter service kit (M-3060-0933) contains:

SMC part number




5 μm filter element for use with AF20 unit



0.3 μm filter element for use with AFM20 unit



0.01 μm filter element for use with AFD20 unit


We recommend that the above filter kit is replaced every two years.

The Renishaw membrane dryer service kit (M-3060-0943) contains:

SMC part number




Membrane module kit for use with IDG5 unit



Dew point indicator kit for use with IDG5 unit


We recommend that the above filter kit is replaced every four years.