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Calibration and verification requirements for pH, EC, temperature, level, light and rotation measurements.
A sensor reading becomes research data only when its identity, calibration, range, sampling interval, temperature conditions and failure rules are recorded.
\n| Sensor | Calibration/verification | Frequency trigger |
|---|---|---|
| pH | two- or three-point buffers bracketing operation; slope and offset retained | before a trial, after cleaning, on drift or according to electrode stability |
| EC | certified conductivity standard near operating range; temperature compensation checked | before a trial and after probe maintenance |
| Solution temperature | comparison with traceable reference in stirred bath | before deployment and on replacement |
| Level | measured-volume additions across working range | after geometry or sensor position changes |
| PPFD | reference quantum sensor/spectroradiometer mapping | after light, optics or geometry changes |
| Rotation | encoder or video reference across commanded speeds | after drive or load changes |
calibration_id, sensor_id, sensor_model, serial_number,\nreference_standard, reference_lot, reference_value,\nmeasured_value, solution_temperature, fitted_slope,\nfitted_offset, residual, operator, timestamp, firmware_version\n
Out-of-range, non-finite, implausibly fast-changing or stale measurements disable automatic correction. The system logs the rejected value and the reason; it does not silently replace it with a plausible number.
Calibration records identify reference material, method, environmental conditions, corrections and uncertainty.
","text":"In brief Calibration and verification requirements for pH, EC, temperature, level, light and rotation measurements. Sensing architecture. Original project diagram showing the intended data path. [I01] Prototype sensor assembly. Internal build evidence; measurement traceability depends on the published calibration record. [I01] Measurement principle A sensor reading becomes research data only when its identity, calibration, range, sampling interval, temperature conditions and failure rules are recorded. Minimum calibration plan Sensor Calibration/verification Frequency trigger pH two- or three-point buffers bracketing operation; slope and offset retained before a trial, after cleaning, on drift or according to electrode stability EC certified conductivity standard near operating range; temperature compensation checked before a trial and after probe maintenance Solution temperature comparison with traceable reference in stirred bath before deployment and on replacement Level measured-volume additions across working range after geometry or sensor position changes PPFD reference quantum sensor/spectroradiometer mapping after light, optics or geometry changes Rotation encoder or video reference across commanded speeds after drive or load changes pH electrode model SEN-1 E = E⁰ − (2.303RT/F) · pH Ideal Nernst response of a hydrogen-ion-sensitive electrode; practical slope and offset are fitted during calibration. Calibration record calibration_id, sensor_id, sensor_model, serial_number, reference_standard, reference_lot, reference_value, measured_value, solution_temperature, fitted_slope, fitted_offset, residual, operator, timestamp, firmware_version Fault rules Out-of-range, non-finite, implausibly fast-changing or stale measurements disable automatic correction. The system logs the rejected value and the reason; it does not silently replace it with a plausible number. Traceability Calibration records identify reference material, method, environmental conditions, corrections and uncertainty. [R38] [R39] [R43] [R46]","source_ids":["I01","R38","R39","R43","R46"],"visuals":[],"sources":[{"id":"I01","authors":"FlavoRotor project team","year":2026,"title":"FlavoRotor prototype implementation record","publication":"Internal engineering report","doi":null,"url":"/research/platform","source_type":"internal primary record","relevance":"Documents the built rotating prototype, sensing electronics, dashboard and current validation limitations.","verification":"Derived from the original FlavoRotor project document","verified_on":"2026-07-26","verification_status":"INTERNAL PRIMARY RECORD","verified_against":"Original internal project file and extracted media"},{"id":"R38","authors":"Joint Committee for Guides in Metrology","year":2008,"title":"Evaluation of measurement data — Guide to the expression of uncertainty in measurement","publication":"JCGM 100:2008","doi":"10.59161/JCGM100-2008E","source_type":"international metrology guide","relevance":"Defines the framework for measurement models, standard uncertainty, combined uncertainty and expanded uncertainty.","verification":"Official BIPM/JCGM record checked 2026-07-26","url":"https://doi.org/10.59161/JCGM100-2008E","verified_on":"2026-07-26","verification_status":"DOI METADATA CHECKED","verified_against":"Publisher, DOI landing page, PubMed or official repository where available"},{"id":"R39","authors":"Joint Committee for Guides in Metrology","year":2012,"title":"International vocabulary of metrology — Basic and general concepts and associated terms","publication":"JCGM 200:2012","doi":"10.59161/JCGM200-2012","source_type":"international metrology vocabulary","relevance":"Defines measurement, calibration, accuracy, precision, repeatability, resolution and related terms used throughout the documentation.","verification":"Official BIPM/JCGM record checked 2026-07-26","url":"https://doi.org/10.59161/JCGM200-2012","verified_on":"2026-07-26","verification_status":"DOI METADATA CHECKED","verified_against":"Publisher, DOI landing page, PubMed or official repository where available"},{"id":"R43","authors":"International Organization for Standardization","year":2017,"title":"ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories","publication":"ISO/IEC","doi":null,"url":"https://www.iso.org/standard/66912.html","source_type":"international standard","relevance":"Supports traceability, method validation, equipment control, records and competence for external laboratory measurements.","verification":"Official ISO record checked 2026-07-26","verified_on":"2026-07-26","verification_status":"OFFICIAL RECORD CHECKED","verified_against":"Official ISO catalogue record"},{"id":"R46","authors":"Heckert, N. Alan; Filliben, James J.; Croarkin, C. M.; Hembree, B.; Guthrie, William F.; Tobias, P.; Prinz, J.","year":2002,"title":"NIST/SEMATECH e-Handbook of Statistical Methods","publication":"NIST Handbook 151","doi":null,"url":"https://www.nist.gov/publications/handbook-151-nistsematech-e-handbook-statistical-methods","source_type":"official statistical handbook","relevance":"Supports calibration regression, residual analysis, experimental design and statistical process control.","verification":"Official NIST publication record checked 2026-07-26","verified_on":"2026-07-26","verification_status":"OFFICIAL RECORD CHECKED","verified_against":"Named official institution record"}]}