Fault Finding Guides · Free PDF
NAMUR NE107 Diagnostic Status Guide
A one page guide to NAMUR NE107 diagnostic status categories used by smart field devices, with what each means for operators and maintenance.
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A one page A4 guide to print for the workshop or keep on your phone in the field. The full content is also shown below.
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- Permit, isolation and control room informed.
- Put the loop in manual or inhibit trips as authorised.
- Use certified test equipment in hazardous areas.
- Record as found readings before changing anything.
Quick checks
- Read the detailed diagnostic behind the status.
- Map statuses to alarms and maintenance work orders.
- Do not suppress F status at the DCS.
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Symptoms, causes and fixes
| Symptom | Likely causes | Checks and fixes |
|---|---|---|
| F: Failure | Device or process fault, output not valid | Treat measurement as bad; repair |
| C: Function check | Local work: simulation, calibration, configuration | Confirm work in progress; return to normal |
| S: Out of specification | Outside measuring limits or uncertain conditions | Check process conditions and installation |
| M: Maintenance required | Valid but wear or drift detected | Plan maintenance before failure |
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Related NAMUR NE43 current levels
| Current | Meaning |
|---|---|
| 3.8 to 20.5 mA | Valid measurement |
| ≤ 3.6 mA | Failure downscale |
| ≥ 21.0 mA | Failure upscale |
Related Tools, Procedures and Calculators
Frequently Asked Questions
What is NAMUR NE107?
A recommendation that groups device diagnostics into four status signals with standard symbols and colours.
How does NE107 relate to NE43?
NE43 defines fault currents on 4 to 20 mA; NE107 defines status categories, mostly sent digitally.
Should C status alarm operators?
It should inform them that the device is under maintenance.
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