Temperature Element and Transmitter Data Sheet Template
A data sheet for a complete temperature assembly: sensing element (RTD or thermocouple), thermowell and transmitter, including tolerance class, insertion length, wake frequency requirement and sensor burnout direction.
Download
- How to Use sheet with steps
- Template sheet, blank and ready
- Example sheet, filled in
- Drop down lists for consistent entries
- A4 portrait 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 element and transmitter data sheet looks.
Specification
| No | Parameter | Value | Unit / notes |
|---|---|---|---|
| General | |||
| 1 | Tag number | TT 2101 | |
| 2 | Service | Reactor jacket outlet | |
| 3 | Line or equipment | 4" / Sch 40 line | |
| 4 | P&ID number | PID 200 03 | |
| 5 | Hazardous area | Zone 2, IIB T3 | |
| Process conditions | |||
| 6 | Fluid | Hot water | |
| 7 | Operating temperature (normal / maximum) | 120 / 160 | °C |
| 8 | Design pressure / temperature | 10 / 180 | bar g / °C |
| 9 | Fluid velocity | 2.5 | m/s |
| 10 | Pipe size (for immersion length) | 4" Sch 40 | |
… and 22 more rows in the download.
About the Temperature Element and Transmitter Data Sheet
A temperature measurement is only as good as its weakest part: an element of the wrong class, a thermowell that is too short or that vibrates in high velocity flow, or a transmitter that fails the wrong way on sensor break. Specifying the element, well and transmitter together avoids these problems.
How to fill in this template
- Enter process conditions, including fluid velocity, which is needed for the thermowell calculation.
- Choose the element type, tolerance class and number of wires (4 wire for best RTD accuracy).
- Specify thermowell type, connection, material and dimensions; request the wake frequency calculation.
- Specify the transmitter range, output and burnout direction so a sensor failure drives the loop safe.
- Issue with the requisition for vendor completion.
What the formulas do
- No formulas: specification document.
Related tools
Frequently Asked Questions
RTD or thermocouple?
RTDs (Pt100) are more accurate and stable up to about 600 °C; thermocouples cover higher temperatures and respond faster but are less accurate.
Why is a wake frequency calculation needed?
Flow past a thermowell sheds vortices. If their frequency approaches the well natural frequency, the well can vibrate and fail. ASME PTC 19.3 TW defines the check.
What is burnout direction?
The output the transmitter drives to when the sensor fails: upscale (high) or downscale (low), chosen so the control or trip action is safe.
Learn more on the blog
Thermocouple and RTD installation precautions
A practical guide on instrumentationblog.in that explains the procedure behind this template and how engineers apply it on real plants.
Read Full Article