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Simulated workplace
Scenario · Electrical, Control and Instrumentation

Diagnose and repair a drum level transmitter fault

You are an Instrument Technician on the electrical, control and instrumentation crew.

Intermediate3 to 4 hours7 tasks
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Home/Scenarios/Diagnose and repair a drum level transmitter fault
The situation

What has happened

HRSG2 raised a drum level deviation alarm on 9 September with transmitter LT-2-201 reading 80 millimetres above LT-2-202. The unit controller transferred level control to LT-2-202 and HRSG2 continues at full load on a single transmitter, which the Electrical and Instrumentation Manager considers a risk. Work order WO-26-5140 and permit request PTW-26-1192 are open. The transmitter's impulse lines run from the drum at high pressure and temperature, and the loop must be taken out of scan so the control system does not act on your test signals. The market operator has directed the station to 380 megawatts from 2:00 pm tomorrow.

Your brief. Take the permit, isolate the transmitter safely, fault find from the impulse lines to the transmitter and the loop, calibrate or replace the transmitter, return the loop to scan with a test record and close the work order with the results.
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Tasks

Deliverables

  • Isolation and proving record on the permit
  • Fault finding sequence
  • Calibration record on the work order
  • Operations Log entry for return to service

Documents to use

Systems to use

Permit and Isolation Register

Records every permit to work and its isolations from request through issue, work, restoration and close out.

Maintenance Work Orders and Defects

Holds every defect raised and every planned and corrective maintenance work order across the three sites with priority, crew and completion records.

Operations Log

The control room's chronological record of plant events, starts, shutdowns, alarms, operational checks, readings and instructions across all three sites.

For trainers and assessors

Units of competency

Current on training.gov.au for the Electricity Supply Industry - Generation Sector Training Package as at 10 September 2026.

UEPMNT357Diagnose and repair faults in instrumentation equipment
UEPMNT356Maintain instrumentation equipment
UEPOPS017Conduct single energy source isolation procedures for permit to work
UEPMNT351Test and commission electrical equipment

Qualifications

UEP40322Certificate IV in ESI Generation Maintenance - Electrical Electronics
Assessor notes

What to look for

Evidence guide

Look for isolation that includes the process pressure and temperature as well as the loop, a fault finding sequence that moves from the simplest cause to the transmitter itself, calibration records with as found and as left values and the instrument used, and a return to service that confirms agreement with the second transmitter before control is handed back. The root cause note must be specific.

The student's evidence summary lists every record they created or changed in the systems named above, their notes and the tasks they ticked. Verify it against the deliverables and your own assessment tool.