BS ISO 4266-6:2002

1 Scope
2 Normative reference
3 Terms and definitions
4 Precautions
   4.1 Safety precautions
   4.2 Equipment precautions
   4.3 General precautions
5 Accuracy
   5.1 General
   5.2 Intrinsic error of ATTs
   5.3 Calibration prior to installation
       5.3.1 General
       5.3.2 ATT calibrated as a system
       5.3.3 ATT calibrated by components
       5.3.4 Multiple-point ATTs
       5.3.5 Uncertainty of the reference
   5.4 Error caused by installation and operating conditions
   5.5 Overall accuracy
       5.5.1 General
       5.5.2 Use of ATT for fiscal/custody transfer
             purposes
6 Selection of ATTs
   6.1 General
   6.2 ATTs for fiscal/custody transfer purpose
7 Description of ATT equipment
   7.1 Introduction
   7.2 Electrical temperature elements
       7.2.1 Resistance temperature detectors
       7.2.2 Other temperature elements
8 Installation of ATTs
   8.1 General
   8.2 Single-point (spot) temperature elements
   8.3 Multiple-point temperature elements
   8.4 Moveable spot temperature element
   8.5 Other methods
   8.6 Thermowells for electronic temperature elements
   8.7 Thermowells for verification purposes
9 Calibration and field verification of ATTs
   9.1 Introduction
   9.2 Calibration of single-point temperature element
       ATTs used for fiscal/custody transfer purpose
       9.2.1 Calibration prior to installation
       9.2.2 Initial field verification
   9.3 Calibration of upper, middle and lower or
       multiple-point ATTs
       9.3.1 Calibration prior to installation
       9.3.2 Initial field verification
   9.4 Subsequent verification of ATTs
       9.4.1 General
       9.4.2 Frequency of subsequent verification
       9.4.3 Record keeping
10 Data communication and receiving
Bibliography

Provides guidance on the selection, accuracy, installation, commissioning, calibration and verification of automatic tank thermometers (ATTs) in fiscal/custody transfer applications in which the ATT is used for measuring the temperature of petroleum and liquid petroleum products, stored in pressurized storage tanks.

This part of ISO4266 gives guidance on the selection, accuracy, installation, commissioning, calibration and verification of automatic tank thermometers (ATTs) in fiscal/custody transfer applications in which the ATT is used for measuring the temperature of petroleum and liquid petroleum products, stored in pressurized storage tanks.

This part of ISO4266 is not applicable to the measurement of temperature in caverns or in refrigerated storage tanks.