Certificat d'étalonnage
issued by the calibration laboratory
délivré par le laboratoire d'étalonnage
P. O. Box MB 245, Accra, Ghana
TEL: +233-302-500065/6 Fax: +233-302-500092
E-Mail: scientificmetrology@gsa.gov.gh
| Certificate number | GSA/THL/2026/0001 |
| Calibration mark | D-K-15209-01-00 |
| 2026-06 |
| Object / Objet | thermo-hygrometer |
|---|---|
| Manufacturer / Fabricant | Elsmar Cove |
| Type / Type | 74BX0S89 |
| Serial number | D4VAX234 |
| Customer / Client | Noguchi Memorial Institute for Medical Research (NMIMR) |
| Order number | REQ-202606-0001 |
| Number of pages | 2 |
| Calibration date | 2026-05-21 TO 2026-06-02 |
| Date of issue | 02 Jun 2026 |
| Due date | 02 Jun 2026 |
This calibration certificate documents the metrological traceability to national standards, which realize the units of measurement according to the International System of Units (SI).
The DAkkS is signatory to the multilateral agreements of the European co-operation for Accreditation (EA) and of the International Laboratory Accreditation Cooperation (ILAC) for the mutual recognition of calibration certificates.
The user is obliged to have the object recalibrated at appropriate intervals.
Ce certificat d'étalonnage documente la traçabilité métrologique des grandeurs mesurées par raccordement aux étalons nationaux en conformité avec le SI.
This calibration certificate may not be reproduced other than in full except with the permission of the issuing laboratory.
Ce certificat d'étalonnage ne peut être reproduit que dans son intégralité.
Date of issue / Date
2026-06-02
Approved by / Approuvé par
Obed Agoe
Laboratory Officer — Temperature & Humidity Laboratory
| GSA/THL/2026/0001 |
| D-K-15209-01-00 |
| 2026-06 |
DKD-R 5-8:2019 (Humidity) / DKD R-5-1:2018 (Temperature)
Place of test: Humidity Laboratory
| Setpoint | Ref Temp (°C) | Ref RH (%RH) | EUT RH (%RH) | Deviation (%RH) | Expanded Uncertainty U (%RH) |
|---|---|---|---|---|---|
| SP1 | 25.00 | 39.87 | 40.00 | 0.1350 | 1.702 |
| SP2 | 25.00 | 59.87 | 60.88 | 1.0100 | 1.702 |
| SP3 | 24.99 | 79.88 | 80.17 | 0.2950 | 1.703 |
| 15°C / 50%RH | 14.99 | 49.82 | 50.00 | 0.1850 | 1.708 |
| 35°C / 50%RH | 34.98 | 49.84 | 50.15 | 0.3150 | 1.699 |
| Setpoint | Ref Temp (°C) | EUT Temp (°C) | Deviation (°C) | Expanded Uncertainty U (K) |
|---|---|---|---|---|
| 15°C / 50%RH | 14.99 | 15.03 | 0.0400 | 0.584 |
| 35°C / 50%RH | 34.98 | 35.02 | 0.0440 | 0.593 |
The uncertainty stated is the expanded uncertainty obtained by multiplying the standard uncertainty by the coverage factor k = 2. It has been determined in accordance with DKD-R 5-8:2019 and EA-4/02 M:2022. The value of the measurand lies within the assigned range with a probability of approximately 95%.
Uncertainty contributions include: reference standards, chamber spatial inhomogeneity, temporal instability, radiation influence, EUT resolution, repeatability, and self-heating effects.
The results of calibration are valid at the time of calibration.
This certificate complies with ISO/IEC 17025 requirements.
Issued by the GSA Temperature and Humidity Laboratory.
End of calibration certificate.
Ghana Standards Authority — Temperature & Humidity Laboratory • Cert. No. GSA/THL/2026/0001 • Issued: 2026-06-02