APPLIES TO PORTABLE QSTAR UFM (Continued)
42
Current output 1 (I1A/B):
Current flow is directed
from I1B to I1A.
Current output 2 (I2A/B):
Direction of the current flow
is directed from I2B to I2A
How 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” -> Analog outputs.
Select the analog output to be used:
Specify the variable to be output at the analog output:
Select the value to be assigned to the 4mA output
(Example Flow)
Select the value to be assigned to the 20mA output.
The analog outputs at your UFM only support unidi-
rectional flow.
i
QStar UFM can only provide positive flows to
the outputs. The flow display must return posi
-
tive values. What happens if the value exceeds
the setup high or low limits? Example: You
expect a flowrate of 100m3/h and assigned this
rate a value of 20 mA. However, the flowrate
may reach 130 m³. This means that a value of
20mA will also be output for flowrates higher
than 100 m3/s.
i
When do you have an error situation?
•
If limits of the values previously assigned
to the 4mA and 20mA outputs were ex-
ceeded on expiration of a specific time
(burnout)
•
Signal loss
Example:
You expect a maximum flowrate of
100 m3 in your application and assigned this
rate the 20mA value. You also set the following
defaults for the error mode.
If an error is pending, the 4mA to 20mA output
enters the error mode and outputs 4mA on expi-
ration of a delay time of 20 seconds. In practical
operation you may have a flowrate of 130 m³
in the piping for a duration up to two minutes.
In this case, QStar UFM would output 20mA
for the duration of 20 seconds and then enter
the error mode and output 4mA on expiration
of a timeout of 20 seconds. After the flowrate
has dropped again to a value less than 100
m³ (on expiration of 100 seconds),the QStar
UFM will automatically exit the error mode and
output the setup current for the flow.