The engineers and designers of our Instrumentation division get involved in all stages of a project, from design to commissioning to:

  • Design industrial operable facilities adapted to future user needs.
  • Describe safety constraints including maintainability and operability: deviations review on PID (HAZOP), safety loops definition, security devices.
  • Intervene during commissioning and startup phases.

ERAS provides to clients its competences in instrumentation:

  • Instrumentation of process flow diagram in relation with technical teams
  • Control loops design
  • Data-sheet of measuring, detection and control equipment with recommendations of appropriate constraints solutions (products used , environment, accuracy required , ...)
  • Control equipment sizing (control valve)
  • FAT/SAT instrumentation equipments and installations
  • Call to tender and construction management
  • Instrumentation balance : Air consumption, amount of inputs / outputs for DCS, SNCC, SIS
  • Installation drawings, assembly drawings
  • Definition of safety loops (SIL calculations )
  • Design and sizing for instrumentation cable trays


All studies for cable tray routing are directly performed on 3D model.

Our experienced teams provide their multi-industry expertise and the mastering of tools such as Aveva Instrumentation, Cims, Smartplant Instrumentation and GRIF. They are also certified QualiSil.


We also have expertise in industrial analysis & ATEX classification area:

Analysis system Design

  • Needs and requirements definition for specific application analysis
  • Selection of the analytical principle of on-line analyzer
  • Selection of the analyzer from thoseavailable on the market
  • Definition and design of the sampling system as a whole:
  1. Sampling Point / return point.
  2. Sample Pre-conditioning.
  3. Sample Transportation.
  4. sample Conditioning.
  5. On-line Validation/calibration system for analyzer.
  6. Sample collecting system (when process return is not possible).
  7. Sampling (for laboratory analyzes).
  8. Cleaning device.
  9. Isolation device of analysis system.


  • Definition of analysis system protection (box, shelter, HVAC, sensors, etc.)
  • Definition and design of utilities.


ATEX zone classification

  • Establishment of an Explosion Protection Document:
  1. List of flammable substances
  2. List of possible emission sources
  3. List of electrical and non-electrical devices
  4. Evaluation and definition of ATEX zones
  5. ATEX zoning Plan


  • Verification of devices conformity
  • Definition of compensatory measures.