Certification Services

Gauging Tapes and Bobs, Hydrometers, Thermometers Liquid & Digital

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Gauging Tapes and Bobs

Certified tapes can be provided by the NIST or the factory. The NIST is available with approximately a 10 week delivery. Factory tape requests must be submitted for approval by the factory. The factory does a limited amount of certified tapes.

Request for certified tapes should contain the following information: type of tape, length and the type of test. (Standard tension test and/or tension test for accuracy test). You must be aware that the tape will be checked with bob since the bob is part of the measured section. The bob and tape will be identified by a serial number marked on both pieces and will be accompanied by papers which attest to their accuracy.

Hydrometers

Certified hydrometers are available from the manufacturer or laboratory that calibrates density instruments. Request for calibration should contain the following: ASTM number, range, number of API gravity and temperature points to be certified. Hydrometers will be identified by serial number and be accompanied by papers which attest to their accuracy as stated above.

Temperature Devices (Liquid-In-Glass)

The API's Chapter 7 states that before each LIG thermometer's initial use and at least once a year after the initial use, each thermometer shall be compared to a thermometer certified by the National Institute of Standards and Technology (NIST) or an equivalent thermometer of traceable accuracy. The comparison shall be made at three or more temperatures to ensure that the thermometer is accurate. Typically, the checkpoints should be 10%, 50%, and 90% of the range in which the thermometer is expected to be used.

Temperature Devices (Portable Electronic Thermometers)

The API's Chapter 7 states that before initial use, and at least once a year thereafter, each portable electronic thermometer shall be compared at three or more temperature points, near the mid point and ends of the range; with either a National Institute of Technology (NIST) certified reference thermometer or an equivalent thermometer with accuracy traceable to the NIST. The PET shall be calibrated in accordance with the manufacturer's instructions.