H-B Instrument Company a world class manufacturer of temperature, density & weather instruments

By: H B Instrument  09-12-2011
Keywords: calibration

ISO/IEC 17025:2005 Accredited Calibration Services
When Accuracy Counts, Our Expertise is at Your Service

A2LA accreditation in accordance with ISO/IEC 17025:2005 covering the scope of liquid in glass, electronic and bi-metal thermometers and proof, specific gravity, Baume heavy and light and American Petroleum Institute Scale hydrometers, timers and stopwatches


Test procedures of NBS Monograph 150 and 174 and ISO 17025 as guidelines


Quality standards meeting ISO 9001:2008 and ISO/IEC 17025:2005 through A2LA, ANSI/NCSL Z540-1 criteria


Individual calibration to NIST and DKD/PTB standards

Calibration Reports & Statements of Accuracy/Traceability are not the same

A Calibration Report, specifies corrections at specific points. A Statement of Accuracy/Traceability accompanies most instruments and states that it was tested against a reference standard and was found to have accuracy within the specification for that type of instrument - it meets conformance standards.

Calibration of an instrument involves checking the instrument under magnification for any defects - cracks, impurities, etc that may impair the functionality of the instrument. Your instrument will be compared to NIST and DKD/PTB certified standards at the specified test points in accordance with the aforementioned test procedures and methods. A signed and laminated Calibration Report will be issued showing the results of the test meeting the quality and record keeping requirements for ISO/IEC 17025, ISO 9000 and FDA.

Thermometers/Hydrometers may need to be recalibrated; does yours?

Temperature standards are dynamic with use. Shock, contamination and other factors can cause drift from accepted values. In general laboratory use, we recommend calibration of liquid in glass thermometers at one year intervals. NIST further recommends six month intervals for liquid in glass thermometers used as standards. Other factors to consider in determining calibration intervals include calibration history, measurement assurance data, data for the population of similar equipment, and statistical analysis methods. This would apply to hydrometers as well.

NIST Publication GMP-11, Good Measurement Practice for Assignment and Adjustment of Calibration Intervals for Laboratory Standards, establishes calibration intervals for standards and instrumentation used in measurement processes. NIST guidance documents are available on their website.

3 Simple Steps Toward Calibration:


CALL H-B Instrument Company at 610-489-5500 to place your calibration order. A Service Request (SR) number, pricing and expected delivery date (averaging 5 business days) will be provided.



SEND your instrument/s to H-B Instrument Company. Our team of experts will inspect and calibrate your instrument against NIST and DKD/PTB certified standards and corrections will be recorded.



RECEIVE your instrument and Calibration Report in a heavy-duty storage box. The calibration data will be stored in our database for future reference.



VALUE ADDED: An annual reminder will be sent for recertification 11 months after initial certification.

All calibrated instruments are provided with a Calibration Report from our exclusive triple accredited/registered manufacturing and calibration facility - ISO/IEC 17025:2005 through A2LA; ISO 9001:2008; and ISO 14001:2004.

Each instrument is individually calibrated against National Institute of Standards and Technology (NIST) and Deutscher Kalibrierdienst (DKD/PTB) standards at specific temperature points. The report identifies corrections to one-tenth the smallest division. Each instrument is individually serialized to easily match the instrument and the report. Test procedures of NBS Monograph 150, 174 and ISO 17025 serve as guidelines for calibration.

Keywords: calibration