Chapter 1. Programming Site Data
28
DigitalFlow™ DF868 Multipurpose Ultrasonic Liquid Flowmeter Programming Manual (2-Channel)
1.6.5.5
SETUP Limits and Default Values
Table 14: Default Values and Limits for SETUP Parameters
Parameter
Default Value
Low Limit
High Limit
Transit-Time Parameters
Signal Low Limit
40
-20
100
Cor. Peak Limit
100
0
500
Soundspeed ± Limit
20%
1%
50%
Velocity Low Limit
-40.0 ft/sec (-12.142 m/sec)
-100 ft/sec (-30.48 m/sec)
+100 ft/sec (+30.48 m/sec)
Velocity High Limit
-40.0 ft/sec (-12.142 m/sec)
-100 ft/sec (-30.48 m/sec)
+100 ft/sec (+30.48 m/sec)
Acceleration Limit
15.0 ft/sec
2
(4.6 m/sec
2
)
0
100 ft/sec
2
(30 m/sec
2
)
Amp. Discrim Low
14
0
100
Amp. Discrim High
34
0
100
Delta T Offset
0
-1,000 µsec
1,000 µsec
% of Peak
50%
-100%
100%
XMIT Sample Size
8
2
32
# Errors Allowed
6
0
16
Minimum Peak % Limit
-100
+100
Maximum Peak % Limit
-100
+100
T Window
0
0
1,000
R Window
10
10
128
TransFlection
Signal Low Limit
40
-20
100
Velocity Low Limit
-40.0 ft/sec (-12.142 m/sec)
-100 ft/sec (-30.48 m/sec)
+100 ft/sec (+30.48 m/sec)
Velocity High Limit
-40.0 ft/sec (-12.142 m/sec)
-100 ft/sec (-30.48 m/sec)
+100 ft/sec (+30.48 m/sec)
Rep Period 1
200 µsec
100 µsec
3,200 µsec
Rep Period 2
800 µsec
100 µsec
3,200 µsec
XMITS per Reading
5,000
1,024
30,000
Weak Signal Threshold
20
0
100
Code Length
8
1
16
Filter Width
48
8
64
Averaging Factor
5
0
16
# Errors Allowed
6
0
16
ADVAN Option
Fluid Density
0.062 lb/ft
3
624.22 lb/ft
3
Minimum Tw
0
500 µsec
Maximum Tw
0
500 µsec