Tools and Test Equipment recommended for ex repair work.

Updated: Feb 22, 2019

The most common Ex equipment service facilities are likely to come across are Ex d (flameproof), Ex n/nA (Non-sparking), and Ex e (increased safety) machines. Of these, the most complex to repair are the Ex d machines.


When working on an Ex d apparatus, the following measuring equipment suitable for the size of machine being inspected:

Accurate measuring equipment with an in date certificate of calibration must be used for ex repair work.

  1. Engineer’s Rule: inch and metric

  2. Feeler Gauges: inch and metric.

  3. Calibrated Digital or Analogue Vernier Callipers/Micrometres: Strongly recommended for measuring metal thickness, outside and inside diameters. Appropriate to the frame size