A new opportunity has arisen for a Senior or Principal Instrument Engineer to join our Head Office Engineering team based in Irvine, North Ayrshire. Competitive salary package on offer.

Booth Welsh Mission Statement

To engineer value by engagement, collaboration and innovation; optimising processes by deploying technology and digitalisation to create unique differentiators for project execution and life cycle support.

As a key member of our engineering team we are looking for a talented individual with a wide range of professional skills. The role requires the individual to be working on and controlling multiple concurrent projects with a keen eye to ensuring deadlines are achieved. There will be a strong client interface and a wide degree of instrumentation technical knowledge as well as considerable experience in an industrial environment. Ideally candidates will have pharmaceutical/fine chemical experience and will possess the necessary competencies and behaviours to be able to work with minimum supervision.

Below gives you an idea of the work we undertake here at Booth Welsh.

Chartered or working toward Chartered status (preferable but not essential).

Degree qualified in a relevant engineering discipline (preferential but not essential).

Relevant Engineering experience and high technical capability for core Instrument Engineering discipline.

Experience of managing small Instrument Engineering & Design teams.


Process Control

Field Instrumentation Specification & Procurement (Flow, Level, Press, Temperature)

Actuated Valve Specification & Procurement, incl. SOV/Lim-Switch peripherals

Control Valve Specification & Procurement

Instrument signal peripherals (I.S. Isolators, conditioners, I/L relays & Interface Relays)

Knowledge of Complex Instrumentation (Analysers, Vibration monitoring or similar)

Field Instrument Installation Design: Scope of Work, ILDs, Cable Schedules, IO & Device Schedules, Schematic Diagrams, Termination Diagrams, Instrument Hook-up Diagrams.

Specification of Instrument Equipment for Hazardous Areas

Good knowledge and understanding of ATEX regulations, certification and IP ratings.

Hazardous Area Design (incl. adherence to BS EN IEC (phone number removed) and other relevant sub sections of BS EN IEC 60079)

Hazardous Area Design specifics for I.S. Installations (incl. DSD calculations)

Functional Safety Lifecycle requirements (design & implementation phases for adherence to IEC 61511)


SIL/SIF/SIS designs

BPCS/PLC/Remote IO hardware: Delta-V, Siemens PCS7 & ET200, Allen Bradley, Stahl

Control Panel Design (incl. CE assessment/testing, ATEX certification & FAT) – preferable

Controls System Comms Architecture for comms interaction with smart instrument devices and control panel nodes (Industrial Ethernet, Profibus-DP/PA, Profinet, ASi-Bus, Modbus)

  • Drawing Package – basic competency: AutoCAD and/or MicroStation