🌡️ Temperature Measurement Laboratory
Establishment, maintenance and advancement of national primary standards of temperature measurements in accordance with international standards.
Strategy
Establishment, maintenance and advancement of national primary standards of temperature measurements in accordance with international standards through research and development.
Objectives
Realization, maintain and disseminate the SI base unit of temperature (Kelvin, K). The laboratory provides calibrations and maintains the traceability of temperature measurements at international level.
📏 SI Unit
The kelvin, symbol K, is the SI unit of thermodynamic temperature; its magnitude is set by fixing the numerical value of the Boltzmann constant to be equal to exactly 1.380649 × 10-23 J K-1
🔬 Main Activities
Main activities of the laboratory are participating inter comparisons in the field of temperature and to assure international traceability, provide calibration service to calibration laboratories, testing laboratories and to industry.
👥 Temperature Measurement Customer Services
The Measurement Units, Standards & Services Department (MUSSD) Temperature Measurement customer services are the most accurate and reliable in Sri Lanka. We are responsible for establish, maintain & disseminate the Temperature Measurement Standards in compliance with International Standards, ensuring justice & equity for Government Institutions, Industry, Calibration & Testing laboratories, Health sector, Metrological & other service providers & Consumers, through the regulatory & service activities based on Temperature Measurements to uplift the quality of life and standards of Sri Lankans.
🌡️ The International Temperature Scale – ITS 90
The International Temperature Scale of 1990 (ITS-90) published by the Consultative Committee for Thermometry (CCT) of the International Committee for Weights and Measures (CIPM) is an equipment calibration standard for making measurements on the Kelvin and Celsius temperature scales. It specifies a set of fixed points (melting, freezing, triple, or boiling points) of various pure substances ranging from 0.65±0 K to 1357.77±0 K (−272.50±0 °C to 1084.62±0 °C).
⚙️ Temperature Instrument Calibration Capabilities
Thermometry laboratory provides calibration services to facilitate calibration, testing and research laboratories, inspection and regulatory authorities, industry, trade, health and environmental protection.
Scope for Calibration: Standard Laboratory (In-House Calibration)
| Measuring Quantity Item for Calibration | Measuring Range Measuring Span | Calibration Conditions Calibration Procedure | Best Measurement Capability | Remarks |
|---|---|---|---|---|
| Standard Platinum Resistance Thermometers (SPRTs) | -38.8344 °C to 29.7646 °C | HgTP, GaMP | 5 mK | Calibration at Fix points of ITS 90 Scale |
| 0 °C to 29.7646 °C | GaMP | 5 mK | ||
| 0 °C to 156.5985 °C | InFP | 5 mK | ||
| 0 °C to 231.928 °C | InFP, SnFP | 5 mK | ||
| 0 °C to 419.527 °C | SnFP, ZnFP | 6 mK | ||
| -38.8344 °C to 419,527 °C | Comparison with traceable calibrated SPRT | 6 mK | In a stirred liquid bath | |
| Resistance Thermometers & Temperature Sensors/Probes with display unit | -40 °C to 140 °C 140 °C to 1000 °C |
Comparison with traceable calibrated resistance thermometer | 60 mK 80 mK |
In a dry block calibrator |
| Noble-metal Thermocouples Base-metal Thermocouples |
50 °C to 250 °C 250 °C to 1200 °C |
Comparison with traceable Standard Thermocouple | 0.5 K 0.8 K |
In a high temperature Furnace |
| Liquid in glass Thermometers (LiGTs) | -40°C to 25°C 5°C to 95°C 50°C to 350°C |
Comparison with traceable calibrated resistance thermometer | 60 mK 60 mK 60 mK |
In a stirred liquid bath |
Scope for Calibration: Mobile Laboratory (On-Site Calibration)
| Measuring Quantity Item for Calibration | Measuring Range Measuring Span | Calibration Conditions Calibration Procedure | Best Measurement Capability | Remarks |
|---|---|---|---|---|
| Resistance Thermometers & Temperature Sensors/Probes with display unit | 50 °C to 1000 °C | Comparison with traceable calibrated resistance thermometer | 1.2 K | In a dry block calibrator |
| Incubators, Refrigerators, Ovens, Autoclaves and equivalent customer systems | -20 °C to 140 °C -40°C to 250 °C |
High temperature data logger High temperature shield |
1.0 K 2.0 K |
Using a Data logger traceable to standard laboratory |
📊 Traceability Chart
💰 Calibration Fee
| Thermometric related calibration services | Rs.Cts. |
|---|---|
| Clinical Thermometer | 500 |
| Industrial & Laboratory Thermometers | |
| Digital Temperature Probe/Digital Thermometer | |
| Dial Thermometer Probe | |
| RTD & Thermocouple Thermometer | |
| Range | |
| - 50°C to 140°C | 1250 |
| 140°C to 700°C | 1750 |
| 700°C to 1200°C* | 2500 |
| Liquid in Glass Thermometer* |
Note: All these charges are valid only for FIVE calibration points or less. Each additional calibration point (If required) will be added extra charge of 20% of total calibration fee.
The Temperature Measurement Laboratory provides the most accurate and reliable calibration services in Sri Lanka