Instruction manual

7532 Radar Tank Gauge
Varec, Inc. 3
1.4 Particularities in “Approved” Operation
The 7500 series RTG is set to custody transfer mode after commissioning using a custody
locking switch (see page 36). The position of the custody locking switch is secured and sealed
using the sealing pin. During custody transfer measurement, all custody transfer-relevant
functions for operation are automatically locked, so that the device software can not be used,
either via local operation or via digital communication settings. This locked status is displayed
by the key symbol ( ). The 7500 series RTGs continuously monitor the compliance with
accuracy requirements for custody transfer measurements according to OIML R85. If, for
example, the accuracy cannot be maintained due to quick surface movements, this is reported
via a separate alarm in the local display (displays “#”- symbols) and via digital communication.
1.5 Definition of Terms
For definitions and procedures, please refer to the following documents:
• Manual of Petroleum Measurement Standards, Chapter 3 - Tank Gauging,
Section 1.B - Standard Practice for Level Measurement of Liquid Hydrocarbons in Stationary
Tanks by Automatic Tank Gauging, American Petroleum Institute, second edition, 2001
• OIML R 85, Organisation Internationale de Métrologie Légale, International
Recommendation R 85, edition 1998 (E).