Chapter 1. Programming Site Data
18
DigitalFlow™ GF868 Programming Manual (2-Channel)
1.6.5 Entering Setup Data (cont.)
1.6.5a Setting Signal Limits (cont.)
11.
Press
[ENT]
to accept the current
% of Peak
value or enter a new value and press
[ENT]
.
The percentage of peak used to calculate the transit times and Delta T is specified at this prompt. The default value for
this parameter is 50% and values from 1 to 100% are acceptable.
12.
Use the [
and
[F1]-[F4]
keys to select one of the preset values for the
XMIT Sample Size
from the option bar.
Both the upstream and downstream transducers transmit ultrasonic pulses in bursts, which consist of a series of
transmit pulses.
XMIT SAMPLE SIZE
determines how many bursts are sent in one direction before sending in the other
direction. The default value for this parameter is 8 and values of 2, 4, 8, 16 and 32 are acceptable.
13.
Press
[ENT]
to accept the current
M>S_Switch
value or enter a new value and press
[ENT]
.
If the burst mode is set to Skan/Measure (S/M), the meter switches from Skan to Measure Mode when Delta T is less
than the
M>S_Switch
value.
DO NOT
change this value unless advised to do so by the factory. The default value for this
parameter is 50
sec and values from 0 to 250
sec are acceptable.
14.
Press
[ENT]
to accept the current
# shifts
value or enter a new value and press
[ENT]
.
The number of shifts corresponds to the actual number of transmits per cycle (number of signals added together in one
direction to produce an averaged signal for one interrogation of the fluid) and need only be changed if the environment
is very noisy or the acoustic signal is weak. The default value for this parameter is 3 and values from 0 to 10 are
acceptable.
15.
Press
[ENT]
to accept the current
A Divisor
value or enter a new value and press
[ENT]
.
A Divisor
is used in the calculation of the Measure Mode integrated threshold level and is not normally changed. The
default value for this parameter is 2.5 and values from 0.1 to 10 are acceptable.
16.
Press
[ENT]
to accept the current
# Transmit Pulses
value or enter a new value and press
[ENT]
.
# Transmit Pulses
specifies the number of pulses in a burst. The default value for this parameter is 4 and values from 1
to 16 are acceptable. For difficult conditions (i.e., long paths, high velocity or high temperature), settings as high as 16
may be necessary.
17.
Press
[ENT]
to accept the current
T Window (Cycles)
value or enter a new value and press
[ENT]
.
Normally, the Model GF868 calculates the size of the transmit window based on pipe size and fluid sound speed.
However, for special diagnostic purposes, it may sometimes be necessary to reset the window size. The default value
for this parameter is 0 and values from 0 to 1000 are acceptable.
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