Calibration and traceability

Cydiance loggers use different temperature sensors by product. Calibration and traceability therefore vary by device model, but follow a consistent quality framework.

Calibration layers

Depending on the sensor fitted to your logger, one or more of the following apply:

1. Texas Instruments — factory calibration and NIST traceability

Devices with Texas Instruments (TI) digital temperature sensors rely on TI factory production test and calibration to meet published datasheet accuracy limits.

TI’s calibration and traceability framework (per NIST Traceability for Temperature and Humidity Sensors) includes:

• 100% production test — each unit is tested on a NIST-traceable production setup; verification uses equipment calibrated at ISO/IEC 17025 accredited laboratories
• ISO 9001 quality system — scheduled, documented calibration of production and development equipment; measurement traceability to national standards (NIST for temperature; humidity standards via CIPM MRA where applicable)
• Datasheet conformance — every device is confirmed to meet the min/max accuracy in its datasheet during production
• Traceability tiers — TI defines three levels: Tier 1A (fully device-traceable via factory Unique ID), Tier 1B (Unique ID plus original shipment lot code), and Tier 2 (lot-traceable via shipment box label); the applicable tier depends on the sensor part

Documentation: general NIST traceability letters can be requested from the product page on ti.com or by contacting ths-nist@list.ti.com. TI does not routinely provide per-device calibration certificates with individual measurement uncertainty; accuracy is assured through 100% production testing against datasheet limits.

Cydiance integrates TI sensors under this supplier chain; see layer 3 below for additional PCBA verification.

2. Sensirion — factory calibration (ISO/IEC 17025)

Devices with Sensirion digital temperature and humidity sensors (Switzerland) receive individual factory calibration at Sensirion AG.

Sensirion’s calibration system (per Certified Smart Tracking) includes:

• ISO/IEC 17025:2017 — temperature calibration accredited by the Swiss Accreditation Service (SAS), documented as SCS 0158 on the SAS register
• Per-sensor 3-point calibration — typically at −30 °C, 5 °C, and 70 °C (model-dependent); each unit has a unique serial number
• Transfer standards — calibrated on a scheduled cycle; reference standards are traceable through an ISO/IEC 17025 laboratory to NIST, PTB, or other national metrology institutes under the CIPM MRA / ILAC MRA
• Individual test — every sensor is tested after calibration before shipment

Certificates: where Sensirion offers this service, sensor-specific ISO 17025 calibration certificates can be retrieved from Libellus (PDF / data export) using the sensor serial number.

Cydiance integrates Sensirion sensors under this supplier calibration chain; see layer 3 below for additional PCBA verification.

3. Cydiance — three-point calibration (AQL sampling)

At PCBA, Cydiance performs three-point temperature calibration on a statistical sample per AQL 0.25, General Inspection Level I, using NVLAP-calibrated reference equipment.

This in-factory step verifies performance across the operating range and supplements supplier factory calibration where applicable.

Traceability summary

Layer	Scope	Basis
TI factory	TI-based models	NIST-traceable 100% production test, ISO 17025 test equipment, tiered device/lot ID
Sensirion factory	Sensirion-based models	ISO/IEC 17025 (SAS SCS 0158), 3-point per sensor, Libellus certificates
Cydiance 3-point	Sampled units at PCBA	AQL sampling, NVLAP reference

For model-specific documentation, contact support@cydiance.com with your device serial number.