Icon Process Controls truflo UltraFlo 2000 Series, Руководство по эксплуатации

Страница: 17 / 27

www.iconprocon.com | sales@iconprocon.com | 905.469.9283
17
Ultrasonic Flow Meter
UltraFlo
®
2000 SERIES
10. Creeping Flow Suppression
11. Digital Output Q1 & Q2
(Q2 Only with 8-Pin plug!)
Setting Range 0.0 … 192.0 l/min in 0.006 l/min steps
Default Settings 9 l/min
The creeping suppression excludes flow measurements that result from convection in a narrow band around zero, even with a closed
valve. At the factory, the creeping suppression is set at a standard value in relation to the cross-section of the flowmeter.
There are higher tolerances below the Standard Default Settings.
Fig. 7: Function of the creeping suppression illustrated with 0.6 l/min
The Creeping Suppression Works with a Hysteresis of -25%.
1. Creeping Suppression switch on
2. Creeping Suppression switch off
1.2
1.05
0.9
0.75
0.6
0.45
0.3
0.15
0
-25%
Flow [l/min]
Pulse/Analog output Active Inactive Active Inactive Active
1
2
2
1
Creeping suppression = 0.6 l/min
If the flow rate is lower than 0.45 l/min the pulse output/analog output becomes inactive.
If the flow rate exceeds 0.6 l/min a pulse is output again and added to the totalizer.
Similarly, a value is transmitted to the analog output again. Example :
All outputs switch over to high resistance when the supply is smaller than 18V. When overload or short circuit is detected the digital
outputs are switched off after 100µs for a period of 2s. When time is up the outputs get applied again.
Empty Pipe Filled, No Flow
0V Normal Closed High resistant 0V
0V Normal Open 0V High resistant
24V Normal Closed High resistant 24V
24V Normal Open 24V High resistant
Empty Pipe Output