June 2021
Installation, Operation and Maintenance Manual
MAN712 Rev. 9
Section 5: Working Principle and Detailed Description
Working Principle and Detailed Description
26
The following figure shows the ELBS-20 behavior in presence of a temporary pressure
drop rate.
Figure 13
5.2
Detailed Description
In this section are described the functionalities of each input, output and interface of the
ELBS-20.
Refer to Section 4.2.1 and to Section 4.3 for the pinout and electrical limits of the ELBS-20.
5.2.1
Configuration-Managing Interfaces
The ELBS-20 provides the following Configuration-Managing Interfaces:
•
Local Operator Interface (Keypad-Display)
•
RS232 Port
•
RS485 Port
•
Bluetooth Port
tm (second)
= ((((Pres. Max/VLC PDR)*60)/200)/S.Rate +1)*S.Rate
delay (# of Samples)
= 4 Samples
t_del (second)
= 4 * S.Rate
t_dur (second)
= Duration
Valve
control mode,
no alarm
Pressure
drop greater
than set-point
EVENT6
Pressure
curve
Sampling rate
(S.Rate)
Pressure
drop greater
than set-point
Event condition
cleared
Time
t0-tm
Present
time
t0
Time
t0+t_del
Measuring time
of pressure drop
t_del (Delay time)
Time
No event, normal
operation