Oval ULTRA UF-II, Инструкция по эксплуатации

Страница: 25 / 68

B-526-10N-E
25
CAUTIONS
9.2 Precautions for Models without Battery Pack
(1) Totalized data is written for storage in a non-volatile memory several seconds after process fluid
interruption. Accordingly, a precaution to remember is not to attempt to turn off power while the process
fluid is being delivered, or turn off power simultaneous with process fluid shutoff.
(2) If you shut off power after process fluid interruption, good practice is to turn it off 10 seconds or more after
process fluid shutoff. In applications where a sudden power shutdown or instantaneous power interruptions
is expected during metering, it is desirable to provide an optional battery pack.
(3) If the meter is to be used in custody transfer, we recommend you to provide the battery pack.
CAUTIONS
9.3 About the Register Life
(1) Because of the life expectancy of components incorporated, such as the LCD and non-volatile memory, the
internal electronics is designed to be replaced in about 10 years. The electronics life depends on the
environment in which it is used; if any of the following operating conditions applies, we recommend you to
replace it as an assembly in five to six years:
◆
High temperature environment.
◆
High temperature process fluid measurement.
◆
Field installation with widely varying temperatures.
◆
LCD counter display is exposed to the direct rays of the sun.
◆
Frequent process fluid flows and interruptions.
(2) Models with optional battery pack have a storage life of 10 years approx. after shipment, whether the
battery is consumed or not. In other words, even in applications where the register is powered from an
external source for most of the time and the battery current drain is considered negligibly small, battery
replacement is yet required due to its storage life.
Storage life may be reduced even more under such adverse environmental conditions as:
◆
High temperature environment
◆
High temperature process material measurement
◆
Cold region