APPLIES TO PORTABLE QSTAR UFM (Continued)
43
SETUP THE RELAY
Your QStar UFM is equipped with a relay output.
This output can be assigned a function or a range.
Example of an external circuitry:
You link an alarm beacon with the output to signal that
the flowrate has undershot the lower threshold limit.
Color coding of the relay output cable:
The relay has a NO (normally open) contact.
The contact is only closed when triggered by a
setup function. The contact will retain its open
state on power failure and with low rechargeable
battery. You do not have to observe the polarity
of the wiring since it is potential free.
CAUTION
To access the “Analog output” menu:
In the primary measuring window “Flow 1”:
Select
“SETUP” -> “CMPL SETUP”. In the main menu, select
-> “I/O Setup” -> “Relay:
Choose value (lower limit) for activation of relay. Relay
will be activated when measured value fall below the
limit.
i
In addition to setup variables such as flow,
QStar UFM applies the corresponding unit
that is selected in the “Units Setup” setting
and appended to the respective variable that
is displayed in a measuring window. Example:
If you selected the physical unit m³ for flow
variables, the values of the switching points
are also setup in cubic meter.
Select the upper limit value for the relay. Relay will be
activated when measured value exceeds the maximum
limit.
i
Example:
A pump is operated in an applica-
tion and the discharge volume of this pump
is measured. The pump has a maximum
discharge volume of 6000 m3 /h and there is
a risk of damage to the pump when the dis
-
charge volume drops to less than 150 m3/h.
The objective is for QStar UFM to shut down
the pump as soon as the value drops below
a point at which damage to the pump can be
expected. So in that case, lower limit has to be
set to 150m3/h, upper limit to 6000m3/h. Relay
will be activated if flow falls below 150m3/h or
exceeds 6000m3/h.
The physical unit cubic meter must have been
assigned to the flow variables in the physical
unit settings. The minimum activation point
must have been setup.