What does the job involve day to day?
You look after the parts of a plant that measure and control the process. Skills England's standard for the control and instrumentation option lists programmable logic controllers, flow meters, heat exchangers and safety controls. Your work splits into planned and preventative maintenance, calibration, fault diagnosis, removing and replacing equipment, and inspection and testing. You also keep your own test kit calibrated and in working order.
A typical fault starts with a reading on the control system that does not match the process. You check the transmitter, the cabling and the input card, then prove the whole loop from the field device back to the PLC or SCADA screen. Before you touch anything you accept a permit or safe system of work. When you finish you hand the plant back and write up a job record. Paperwork matters as much as the spanner work.
Where do instrumentation technicians work?
Skills England names energy, manufacturing, processing and utilities among the industries that employ maintenance technicians. The employers who helped build the current standard include National Grid, SSE, Drax, EDF Energy, Sellafield Sites, Ineos, Exxon Mobil and Veolia. That spread runs from power stations to chemical plants and nuclear sites.
Water is a large employer in its own right. Its apprenticeship has its own instrumentation, control and automation option. On water and waste sites the work includes telemetry outstations, calibrating fixed and portable instruments, sorting out data quality problems, and keeping alarms and security equipment running. Expect standby duty. The older utilities standard said technicians may provide 24-hour cover to deal with faults.
Do you need CompEx?
You only need it if you work in explosive atmospheres. Oil and gas, chemical plants and some water and food sites have hazardous areas where equipment must be selected, installed and inspected to tighter rules. CompEx is the scheme employers use to show you are competent for that work. Scotland's electrical trade association, SELECT, says it began in 1993 to give the UK oil and gas industry assurance about electrical and control and instrumentation technicians in hazardous areas.
The scheme now covers chemicals, pharmaceuticals, food manufacturing and utilities as well. Units include the Ex01 to Ex04 Recognised Practitioner Programme and a water utilities course, Ex09 to Ex10. The Health and Safety Executive points to a further unit, Ex11, for non-electrical equipment. Most technicians take CompEx once an employer needs it. You do not need it to start an apprenticeship.
How does this differ from an electrician's job?
Electricians deal mainly with power: supplies, motors, distribution and switchgear. Instrumentation technicians work at signal level, on 4 to 20 mA loops, transmitters, analysers, valve positioners and control logic. The apprenticeship standard reflects this. It runs one shared core, then you choose an electrical, a mechanical, or a control and instrumentation option.
Many plants hire for both, as EC&I technicians. Skills England has a dual-discipline standard that combines electrical with control and instrumentation. If you want to stay flexible, a dual role widens the jobs you can apply for. Building services electrical work, with its JIB grades and the AM2, is a separate career track.
Pay
GBP a year, before tax. Refer to the Instrumentation & Controls salary guide for figures from live adverts.
What you need
- An employer-backed apprenticeshipMost people train on Skills England's Level 3 engineering maintenance technician standard, using the control and instrumentation option. Water companies use their own asset maintenance technician standard, which has an instrumentation, control and automation option.
- Maths and EnglishThe retired utilities standard asked for 3 to 5 GCSEs at A to C, including maths and English, and preferred a B or better in maths for instrumentation roles. If you do not already have Level 2 English and maths, you had to reach that level before finishing.
- Safe isolation and permitsYou must be able to accept a permit to work or safe system of work, isolate equipment, and hand plant back safely once the job is done.
- Calibration and fault findingCalibration, inspection and testing, and diagnosing faults on instruments and control systems are core duties in the standard.
- CompEx for hazardous areasSites with explosive atmospheres expect the CompEx units relevant to the job, such as Ex01 to Ex04. Water sites may ask for Ex09 to Ex10.
- Driving licenceWater and utility roles often cover several sites. The utilities standard included driving a tooled-up van to jobs.
How to get there
- Before startingPick a sector and applyLook for Level 3 control and instrumentation, or EC&I, apprenticeships with water companies, power generators, chemical plants and manufacturers.
- Early apprenticeshipLearn the shared coreHealth and safety, permits, planning work, quality standards and maintenance records are common to every option.
- Later apprenticeshipTrain in the C&I optionCalibration, loop checks, fault diagnosis and replacing instruments and control equipment on live plant, under supervision.
- End of trainingPass end-point assessmentAn independent assessor checks you against the standard. A revised assessment plan replaces the current one for new starts from 13 April 2027.
- Once qualifiedAdd CompEx if neededTake the hazardous area units your site needs, for example Ex01 to Ex04, or Ex09 to Ex10 for water.
- Mid careerMove upExperienced technicians move into senior technician, commissioning, controls or automation roles. Skills England also has a Level 4 automation, control and instrumentation technician standard.
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Questions people ask
Is an instrumentation technician the same as a C&I technician?
In practice, yes. Skills England lists control and instrumentation craftsperson, control and instrumentation maintenance technician, and control, instrumentation and automation technician as job titles for the same option. Water companies usually say ICA, short for instrumentation, control and automation.
What equipment will I work on?
Expect flow meters, transmitters, analysers, PLCs and safety controls. On water sites you will also work on SCADA and telemetry outstations. You calibrate instruments, check loops end to end, and repair or replace field devices and their cabling.
Do I need a JIB gold card to be an instrumentation technician?
Most plant maintenance jobs in water, process and energy are recruited through the industry apprenticeship standards, not the JIB electrician grading. A gold card matters more if you work for an electrical contractor installing EC&I systems on construction sites.
Is CompEx a legal requirement?
CompEx is a competency scheme, not a licence. Sites with explosive atmospheres use it to show their technicians can work safely there. If your employer works in oil and gas, chemicals or some utilities, expect to be sent on the units relevant to the job.
Can I get professional registration?
Yes. People who completed the older utilities engineering technician apprenticeship were eligible for Engineering Technician (EngTech) registration. Many instrumentation technicians use EngTech as a step towards engineering roles.
Sources
- Skills England: Control and instrumentation engineering maintenance technician (OCC1426A)
- Skills England: Engineering maintenance technician - single discipline (ST1426)
- Skills England: Water industry asset maintenance technician (ST1404)
- Skills England: Utilities engineering technician (ST0159, retired)
- SELECT: CompEx associate member details
- HSE: Electricity in potentially explosive locations, general issues
