Chapter 1. Programming Site Data
26
DigitalFlow™ DF868 Multipurpose Ultrasonic Liquid Flowmeter Programming Manual (2-Channel)
Calculating Kinematic Viscosity
Use the KVTab option to calculate the kinematic viscosity (KV) based on signal strength (SS) or temperature. To use
this option, you must select either a static KV value (entered at the Kinematic Viscosity prompt in the PIPE submenu),
a table of KV/SS values (entered in the KV/SS submenu, discussed on page 48), or a table of temperature vs. viscosity
values (entered in the TmpKV submenu, discussed on page 48).
1.
At the
ADVAN
window, press
[F1] =KVTab to select KV Input Selection
.
2.
Press
[F1] to use a static KV value, [F2]
to activate the table of KV/SS values, or
[F3] to activate a temperature
vs. viscosity table.
a.
If you select Tmp/KV, the program asks for the specific
Fluid Table
. Press
[F1]-[F3] to select the desired table.
The DF868 returns to the
Advanced Features
prompt.
Entering a K-factor Table
Use this option to enter a table of K-factors. K-factors are used to create a curve for the flow range (based on velocity
or Reynolds number) that compensates for non-linear flow rates. The DF868 accepts from 2 to 20 pairs. Complete
the following steps to enter multiple K-factors:
1.
At the
ADVAN
window, press
[F2]=MultK to select Multi K Factors
.
2.
Press
[F1]
to disable this option, or
[F2] to Activate Multiple K Factors. If you select NO, the DF868 returns to the
Advanced Features prompt.
3.
At the Custom Type prompt, press
[F1]
to customize velocity values, or
[F2] to customize Reynolds values.
4.
Press
[F1]
to retain the current K-factor table, or
[F2] to Edit the K Factor Table. If you select NO, the DF868 returns
to the Advanced Features prompt.
Note:
If the necessary velocity/Reynolds vs. K-factor data was not provided with the DF868 documentation, the
K-factor table cannot be edited.
5.
Enter the
Number of K-factors
to be entered into the table (from 2 to 20) and press
[ENT].
IMPORTANT:
When editing the K-factor table, the velocities must be entered in increasing order.
6.
Enter the
Velocity (or Reynolds) Value
for K-factor number 1 and press
[ENT].
7.
Enter the
K-factor
corresponding to the velocity or Reynolds number 1 and press
[ENT].
The
VELOCITY#
(or
REYNOLDS #
) and
K FACTOR
prompts repeat for each pair. After you have entered all the pairs,
the meter returns to the
Advanced Features
prompt.
Activating Mass Flow
Use this option to calculate mass flow from a static fluid density. Complete the following steps to enter the fluid
density:
1.
At the
ADVAN
window, press
[F3] (MASS) to select Mass from Static Density
.
2.
Press
[F1]
to disable the
Mass from Static Density
option, or
[F2] to enable mass flow. If you select NO, the DF868
returns to the Advanced Features option.
3.
If you enable mass flow, the meter requires the fluid density (0.062 to 624.220 lb/ft
3
). Use the numeric keys to
enter the density, and press
[ENT].
The meter returns to the
Advanced Features
prompt.
Entering Code Length
Use this option to select the size of the transducer transmission signal. The option is helpful when measuring flow on
small pipes. Five selections are available:
•
AUTO - The meter will determine code length (short/long) automatically, based on pipe size and transducer
type.
•
1-bit - special use only (consult the factory before using)
•
2-bit - special use only (consult the factory before using)