TCS 682-15, Руководство по обслуживанию, Страница: 7 / 24

KEY FEATURES OF 682 METER
TYPICAL ACCURACY CURVE
32 SSU SOLVENT
-0.2
-0.1
0
0.1
0.2
0 5 10 15 20 25 30 35 40
GALLONS PER MINUTE
% DEVIATION
The 682 meter's linear accuracy (percent of error over or under the zero - error level) remains
within design parameters (+/- 0.2%) over its 0.2 to 40 GPM flow range. This exceeds the
maintenance requirements for accurate custody transfer of product, as specified in the National
Institute of Standards and Technology (NIST) Handbook 44.
PRESSURE DROP CURVE
32 SSU SOLVENT
0
5
10
15
20
0 5 10 15 20 25 30 35 40
GALLONS PER MINUTE
P.S.I.
The 682 meter is mechanically capable of accurately metering products as slow as 0.2 GPM, and
as quick as 40 GPM. Comparing the lowest and the highest flow rate results in a 200:1 turn
down ratio for the 682 meter. The nameplate on the 682 meter states the flow rate as 2 - 40
GPM. This matches the flow range across which the meter was tested while earning a Certificate
of Conformance from the National Type Evaluation Program (NTEP). It should be noted that as
viscosity increases, maximum flow rate may decrease. See the viscous liquids performance
graph for specific information. Viscosity is a measure of the flow ability of a product.