BS ISO 4266-4:2002

1 Scope
2 Normative references
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 Variable-length ATTs
       5.3.6 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 purposes
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 Averaging temperature elements
       8.3.1 General
       8.3.2 Upper, middle and lower temperature elements
       8.3.3 Multiple-point temperature elements
       8.3.4 Variable-length RTD temperature elements
       8.3.5 Mid-level temperature element
       8.3.6 Moveable spot temperature element
       8.3.7 Other methods
   8.4 Thermowells for electronic temperature elements
9 Calibration and field verification of ATTs
9.1 Introduction
   9.2 Calibration of single-point, or mid-level temperature
       element ATTs for fiscal/custody transfer purposes
       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 for fiscal/custody transfer purposes
       9.3.1 Calibration prior to installation
       9.3.2 Initial field verification
   9.4 Calibration of variable-length ATTs for
       fiscal/custody transfer purposes
       9.4.1 Calibration prior to installation
       9.4.2 Initial field verification
   9.5 Subsequent verification of ATTs
       9.5.1 General
       9.5.2 Frequency of subsequent verification
       9.5.3 Record keeping
10 Data communication and receiving

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 having a Reid vapour pressure less than 100 KPa, stored in atmospheric 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 having a Reid vapour pressure less than 100kPa, stored in atmospheric storage tanks.

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