MASS-STREAM
TM
Manual Flow Switch D-6300/FS
9.17.114A – edition: 2017-07
Page 18 of 36
•
ʹResetʹ
– factory setting „automatic“
„automatic“: The emitted switch-point signal is automatically reset when the
entered threshold values are met again.
„manual“:
The user actively has to reset the emitted switch-point when the
entered threshold values are met again.
•
ʹ
Delay
ʹ
– factory setting „0 sec“
In this menu item a delay can be set in seconds until the entered threshold value is
activated by the switch-point signal.
2.5.3 Example for Switch-Point Settings „Minimum - Maximum - Alarm“
The instrument only accepts values in [%] for setting the
‘Min alarm’
and
‘Max alarm’
!
This example shows how to adjust the minimum switch-point „27.8 l
n
/min“ and the
maximum switch-point „38.5 l
n
/min“ for a Flow Switch instrument, which is calibrated for a
flow rate of 45 l
n
/min:
•
Minimum Switch-Point:
45 l
n
/min
=
100% flow rate
27.8 l
n
/min
=
minimum switch-point flow rate
Calculation of the required minimum switch-point in [%]:
𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠ℎ − 𝑝𝑝𝑝𝑝𝑠𝑠𝑝𝑝𝑠𝑠
[%] =
27.8
𝑓𝑓𝑝𝑝
/
𝑚𝑚𝑠𝑠𝑝𝑝
45
𝑓𝑓𝑝𝑝
/
𝑚𝑚𝑠𝑠𝑝𝑝 ∙
100% = 61.8%
The
ʹ
Min alarm
ʹ
must therefore be set to 61.8%, so that the instrument emits an alarm
and thus a voltage to Pin 5 when the flow rate drops below „27.8 l
n
/min“.
•
Maximum Switch-Point:
45 l
n
/min
=
100% flow rate
38.5 l
n
/min =
maximum switch-point flow rate