Identify the start and finish of the loop
Give the field tag, signal type, indicated range and engineering units on the current loop sheet. Identify the destination display or recorder and any intermediate isolator or signal converter to be included. A transmitter calibration can be requested on its own line when an instrument-level result is also needed.
Plan the observation and review
Identify the person who can observe the control-room indication and the site engineer responsible for approving the test window. Specify the readings and tag details that should appear on each loop record. For the commissioning team’s own signal source, list its make and ranges under a separate calibration item.
Check the scaling as well as the signal
A signal value only has meaning when it is tied to the configured engineering range. Give the lower and upper values, units and any conversion applied between the field device and the destination display. Identify square-root extraction or another configured calculation where it forms part of the loop. A correct transmitter output can still produce an unexpected display if the receiving channel uses different scaling.
Keep the agreed input, expected indication and observed result together on each test sheet. Include the device tag, control-system channel and drawing revision so the record can be traced through later changes. State whether alarms or other outputs are included or require a separate authorised test. The plant team controls access and restoration, and the quotation should identify the exact point at which the measurement comparison starts and ends.
Group loops by plant area
Pair the panel or room name with the field location for each tag. Add the site code where numbering is reused across plants. Nominate the field and control-room contacts, agree the test window and identify who will confirm that the loop has been restored to its approved configuration.
Process indicators with configurable inputs
A process indicator may display pressure, flow, temperature or another quantity from the same electrical input hardware. Give the selected input type, scaling, decimal position and displayed units. Preserve the configuration before the check, including any linearisation table. RTS can review an input-to-display comparison separately from the physical sensor and process. The report should make clear whether it concerns the indicator alone or an agreed installed measurement chain.