How to convert the measured current to flow rate, 2 pulse output, Pulse output configuration – Dwyer UFC User Manual
Page 33: Paragraph 3.4.2, On – paragraph 3.4.2, Operating procedures
3: Operating Procedures
29
How to convert the measured current to flow rate
Assume the maximum flow rate is F
max
(gal/min) and the minimum flow rate F
min
is ‘0’ (gal/min), as shown.
To calculate the flow rate (gal/min) for a measured current I(mA) then:
3.4.2 Pulse
output
Pulse output configuration
Two parameters can be configured from the
PULSE OUTPUT menu:
• Volume of fluid per pulse.
• Pulse width.
1.
With the instrument operating in the
FLOW
READING mode, press the Pulse function key
to access the
PULSE OUTPUT screen.
2.
Ensure that the
Output is Off.
3.
Select
Vol per pulse and press ENTER.
4.
Enter the required value. (In the example
shown, a pulse is produced for every 10 gallons
of flow).
Note: The
Vol per pulse can only be changed if the Pulse Output is Off.
5.
Select a
Pulse width (in ms) to suit the particular application – e.g. electro-mechanical counter. Refer to
the manufacturer’s data sheet for the minimum pulse width.
6.
Select
Exit and press ENTER to return to the FLOW READING screen.
0-20 mA
0-16 mA
4-20 mA
4
8
12
16
20
F
max
Flo
w
(g
al/m
in
)
I (mA)
F
min
[0-16 mA scale]
[0-20 mA scale]
[4-20 mA scale]
Flow rate
I
F
max
F
min
–
(
)
×
20
-------------------------------------------
F
min
+
=
Flow rate
I
F
max
F
min
–
(
)
×
16
-------------------------------------------
F
min
+
=
Flow rate
I
4
–
(
)
F
max
F
min
–
(
)
×
16
( )
---------------------------------------------------------
F
min
+
=
PULSE OUTPUT
DD-MM-YY HH:MM:SS
Pulse output is ON
Flow units : gallons
Output : Off
Vol per pulse : 10.00
Pulse width (ms) : 10
Exit