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April 2009
Setting up Signal Parameters (cont.)
1. Press the [
2. The first prompt asks for the Delta-T offset. Delta-T is the
difference between the upstream and downstream transit times
of the transducers. The Delta-T offset should normally be set
to zero.
Note: Consult GE Sensing before performing this step.
a. Press
[ENTER]
b. Use the numeric keys to enter the recommended value.
c. Press
[ENTER]
3. The next prompt, the transmitter sample size, is the number of
pulses each transmitter (upstream and downstream) emits. It is
set to 8 by default.
Note: Consult GE Sensing before performing this step.
a. Press
[ENTER]
b. Use the [
recommended number.
c. Press
[ENTER]
4. The next prompt asks for the zero cutoff. Near "zero" flow, the
PT878GC may have fluctuating readings due to small offsets
(caused by factors such as thermal drift in the fluid). The zero
cutoff causes velocity measurements less than the cutoff to be
reported as zero. To set the cutoff:
a. Press
[ENTER]
b. Use the numeric keys to enter the desired value.
c. Press
[ENTER]
9-26
] arrow key to enter the window.
to open the text box.
to confirm your entry.
to open the drop-down list.
] or [
] arrow keys to scroll to the
to confirm your selection.
to open the text box.
to confirm your entry.
Servicing the PT878GC
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