Temperature Transmitter Calibration Report Template
A calibration report for RTD and thermocouple temperature transmitters. Record the simulated sensor signal at each point; the sheet works out the expected mA, error in % of span and result.
Download
- How to Use sheet with steps
- Template sheet, blank and ready
- Example sheet, filled in
- 66 built in formulas
- A4 landscape print setup
- Works in Excel, Google Sheets and LibreOffice
Preview of the Filled Example
This is the Example sheet from the download, so you can see exactly how the completed temperature transmitter calibration report looks.
Calibration results (sensor simulated at the transmitter input)
| Test point (% of span) | Applied temperature | Simulated signal (Ω or mV) | Expected output (mA) | As found output (mA) | As found error (% span) | As found result | As left output (mA) | As left error (% span) | As left result |
|---|---|---|---|---|---|---|---|---|---|
| 0 | 0.0 | 100.00 | 4.000 | 4.006 | 0.04 | PASS | 4.001 | 0.01 | PASS |
| 25 | 50.0 | 119.40 | 8.000 | 8.012 | 0.08 | PASS | 8.002 | 0.01 | PASS |
| 50 | 100.0 | 138.51 | 12.000 | 12.020 | 0.12 | PASS | 12.001 | 0.01 | PASS |
| 75 | 150.0 | 157.33 | 16.000 | 16.026 | 0.16 | PASS | 16.000 | 0.00 | PASS |
| 100 | 200.0 | 175.86 | 20.000 | 20.030 | 0.19 | PASS | 20.002 | 0.01 | PASS |
About the Temperature Transmitter Calibration Report
Temperature transmitters convert an RTD resistance or thermocouple millivolt signal to 4 to 20 mA. The transmitter is normally calibrated by simulating the sensor with a calibrator, so the report records both the simulated signal and the output. The sensor itself is checked separately in a dry block or bath.
How to fill in this template
- Enter the tag, sensor type and calibrated range (LRV and URV in °C) and the tolerance.
- Disconnect the sensor and connect the calibrator in RTD (Ω) or thermocouple (mV) simulation mode.
- For each test point simulate the Applied temperature, write the simulated Ω or mV in the yellow column and the transmitter output in As found output (mA).
- Adjust (sensor trim or output trim) if any point fails and record the As left readings.
- Reconnect the sensor and confirm a sensible process reading before closing the work order.
What the formulas do
- Applied temperature = LRV + (URV − LRV) × test point % ÷ 100.
- Expected output = 4 + 16 × test point % ÷ 100 mA.
- Error (% of span) = (measured mA − expected mA) ÷ 16 × 100; PASS when within the tolerance.
Related tools
Frequently Asked Questions
Should I calibrate the sensor and transmitter together?
A loop calibration with the real sensor in a dry block or bath checks both together and gives the best total accuracy. Simulating the sensor checks only the transmitter.
What resistance does a Pt100 have at 100 °C?
138.51 Ω according to IEC 60751.
Why record the simulated value?
It proves which input was applied, so anyone can repeat or audit the test.
Learn more on the blog
Temperature transmitter configuration: 4 to 20 mA ranging and HART setup
A practical guide on instrumentationblog.in that explains the procedure behind this template and how engineers apply it on real plants.
Read Full Article