Calibration Services
| UKAS Accredited Thermometer Certification
and Factory Certification for Pressure Gauges & Hydrometers We can provide the necessary certification and recalibration services for your instruments. |
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UKAS
Accredited Laboratory For temperature measurement our laboratory, conforming to (BS) EN ISO/IEC 17025:2000, can calibrate all types of liquid-in-glass thermometers, dial type temperature indicators and recorders and temperature sensors. Certification is available for test temperatures between -60°C and +250°C with best measurement capability from 0.01°C. An efficient and competitive service is provided to examine, report on and calibrate customers’ instruments in addition to supplying new, calibrated thermometers. Before calibration takes place all instruments are examined in detail to confirm they are free from any defects and to ensure that they conform to the current revision of any relevant specification. Customers are automatically advised of any non-conformities of instruments they have submitted, prior to calibration. |
| Certificates
of Calibration Certificates are produced with reference to the International Temperature Scale of 1990 (ITS-90). Certificates are issued within the requirements of the United Kingdom Accreditation Service and provide traceability to recognised national standards. Certificates record the test temperature, the reading on the instrument subject to test, the emergent column temperature during calibration (for partial immersion thermometers) and the uncertainty of the test. Calibration Temperatures Unless requested by a customer or required by a particular specification, calibration will take place at five evenly spaced temperatures covering a minimum of 80% of the instrument’s scale and will generally include the ice point. Where an instrument is to be used at particular temperatures, these may be specified by the customer as test temperatures. Changes of Calibration and Re-certification Secular changes can occur as the bulb glass stabilises, particularly over the first year or two after manufacture. These changes can be monitored by regular verification of the ice point only, thus avoiding the expense of a complete calibration certificate. BS 1041 Section 2.1 (Guide to selection and use of liquid-in-glass thermometers) recommends such checks should take place at least annually and that complete re-calibration should take place at intervals of not more than five years. |
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Suitable
Thermometers for Certification It is recommended that mercury thermometers for certification should be selected from instruments which conform to a recognised standard. These standards can also provide thermometers which are suitable for use as sets comprising a number of instruments which together cover a wide temperature band in subdivisions of 0.2°C or 0.01°C. Examples are BS 593 series A or series B or a selection from series F; ASTM types 37C to 42C (equivalent to IP 77C to 82C) and ASTM 62C to 68C. Very few non-mercury thermometers are included in these specifications and where non-mercury instruments are to be certificated it is recommended that they be selected from the LO-tox™ products. |