
DigitalFlow™ DF868 Multipurpose Ultrasonic Liquid Flowmeter Programming Manual (2-Channel)
9
Chapter 1. Programming Site Data
1.6 Entering Channel Data
While following the programming instructions, refer to the menu map in Figure 10 on page 97 or Figure 11 on page 98
.
After selecting
[F1]=CH1
(or
[F2]=CH2
) at the initial programming screen, the following screen appears:
Based on the selection made above, proceed to the appropriate section of this chapter for instructions.
1.6.1
Activating a Channel
The
ACTIV
submenu activates a channel and selects the desired measurement method.
1.
To enter the
Channel PROGRAM
menu, press
[F1]
or
[F2] (depending on the desired channel) at the User
PROGRAM
prompt.
2.
Enter the
ACTIV
submenu by pressing
[F1]
at the
Channel PROGRAM
prompt.
3.
Press
[F1]
to deactivate the channel,
[F2]
to activate Channel 1 in
Transit-Time
mode, or
[F3]
to activate
TransFlection
mode.
The Model DF868 flowmeter can take measurements in two ways:
•
The Correlation Transit-Time™ technique uses a pair of transducers (either wetted or clamp-on) with each
transducer alternately sending and receiving coded ultrasonic signals through the fluid. When the fluid is flowing,
signal transit time in the downstream direction is shorter than in the upstream direction; the difference between
these transit times is proportional to the flow velocity. The DF868 measures this very small time difference and,
using various digital signal processing techniques combined with programmed pipe parameters, determines
the flow rate and direction.
•
The TransFlection
®
technique uses two transducers. One transducer shoots thousands of grouped ultrasonic
pulses in very rapid succession. The pulses bounce off “scatterers” in the liquid (bubbles, solids, or liquid droplets)
and are reflected back to the other transducer. Each received pulse group receives a “snapshot” of the flow. By
comparing all snapshots and averaging out objects that do not appear to move with the flow, the DF868 can
determine flow rate and direction.
Note:
If the DF868 has not been ordered with TransFlection mode, the TRNFL option does not appear.
Proceed directly to the next section to program the
SYSTM
submenu.
Chan 1
PROGR
Start
‰
Press the [
and [
keys and a function key
[F1]-[F4]
to select the desired
submenu. From this screen, press
[EXIT]
to return to the initial
User Program
screen shown on page 1-8.
Channel PROGRAM
status
ACTIV
SYSTM
PIPE
I/O
Содержание DigitalFlow DF868
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Страница 104: ...Appendix A Menu Maps 96 DigitalFlow DF868 Multipurpose Ultrasonic Liquid Flowmeter Programming Manual 2 Channel...
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