Panametrics DigitalFlow DF868 - Page 38

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