B-144-12-E
17
9.3 Precautions at Operation Shutdown (
See also page 18 for the jacketed type.)
(1) Valves should be closed progressively.
Rapid valve closure could, under certain piping conditions, cause a sharp pressure rise by water
hammer, or hydraulic shock, resulting in damage to the meter.
(2) Precautions against pressure buildup on closure
Complete closure of valves upstream and downstream of the meter makes the affected section a
totally enclosed chamber and a pressure buildup relative to a rise in atmospheric temperature could
lead to an unexpected damage to the meter.
(3) Liquids ready to adhere or gel at zero flow velocity
Liquids that tend to adhere and solidify or gel at flow velocities around zero must thoroughly be
washed away from the meter interior with running cleaning fluid before shutdown. Negligence of this
instruction may leave the meter as an immovable unit when the operator attempts to resume meter
operation the next time.
9.4 About 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
9.5 About Meter Factor
If it is desired to change meter factors in an instrumental error testing, for example, you may establish a
new meter factor by the following procedure.
Instrumental error testing must be conducted with proper facilities and procedures specified in the
Weights and Measures Law, Japanese Industrial Instruments Federation, JIS standards, etc.
◎
How to Determine a New Meter Factor
E
New Meter Factor = (Current meter factor)
×
(1
−
−−−
) (mL/P)
100
where current meter factor: Stated in the test report or on the nameplate of the product.
E: Instrumental error determined in the test (%)
IMPORTANT: The new meter factor should be put on paper for later reference.
NOTE:
See 11.5 Parameter Setup Procedure (page 31) to review/modify meter factor.
