Description
Apply instrumentation and control theory under the direction of engineering staff to install, calibrate, troubleshoot, and modify sensors, transmitters, analyzers, control valves, and associated wiring or tubing. Build, test, and adjust instrument circuits and control loops; perform loop checks, documentation, and commissioning to ensure accurate measurement, reliable control, and regulatory compliance for engineering and plant operations.
- • Install, calibrate, and maintain process instruments for pressure, temperature, flow, and level, as well as analyzers.
- • Replace faulty sensors, transmitters, control valves, and pneumatic or tubing components using proper tools and procedures.
- • Set up and operate calibrators, deadweight testers, dry-wells, multimeters, oscilloscopes, and HART or Fieldbus communicators.
- • Read and interpret P&IDs, loop sheets, wiring diagrams, and instrument datasheets to assemble and wire instruments.
- • Diagnose and resolve instrument and control loop malfunctions; coordinate with vendors for parts or technical support.
- • Assemble and panel-build instrument junction boxes, marshalling panels, and control cabinets.
- • Review instrumentation and control drawings for compliance with design specifications, codes, and site standards such as ISA and NEC.
- • Assemble, test, and maintain signal conditioning devices, intrinsic safety barriers, and I/O modules per manuals.
- • Recommend updates to instrumentation standards, calibration procedures, and loop drawings.
- • Maintain calibration records, loop check sheets, and instrument histories in CMMS or electronic logs.
- • Select instruments, fittings, and materials to meet service conditions, accuracy class, and environmental ratings.
- • Estimate labor, materials, and calibration resources; support scheduling and budgeting for instrumentation work.
- • Train operators and maintenance staff on the proper use and care of instruments and controls.
- • Supervise installation and commissioning of instruments, control valves, and associated wiring or tubing.
- • Compile as-built documentation for instrument installations, terminations, and changes, including redlines.
- • Modify instrument ranges, scaling, and control parameters to correct functional deviations.
- • Integrate field instruments with PLC, DCS, or SCADA systems, including I/O configuration and loop checks.
- • Procure spare parts, calibration gases, and consumables; maintain inventory and traceability records.
- • Participate in continuing education on new instrumentation, communication protocols, and safety practices.
- • Research instrument options, lead times, and lifecycle costs; recommend replacements or upgrades.
- • Provide technical support for instrument installation, migrations, upgrades, and performance improvements.
- • Conduct and document QA/QC for calibrations, loop checks, FAT, SAT, and pre-startup safety reviews.
- • Create and update instrument location plans, loop diagrams, and wiring drawings using CAD tools.
- • Install and maintain PLC or DCS I/O, signal wiring, control networks, and control valve positioners.
- • Develop or revise instrument hook-up details and installation practices for industrial facilities.
- • Analyze test data to troubleshoot noise, drift, or accuracy issues and verify interlocks and alarms.
- • Perform proof testing of safety instrumented functions and document results in accordance with IEC 61511.
- • Maintain and troubleshoot gas detection, fire and gas systems, and custody transfer metering as applicable.
- • Support commissioning and startup activities, including loop tuning assistance and cause-and-effect testing.
- • Develop and maintain preventive maintenance and calibration schedules and standards.
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Last reviewed: Jan 2026
