Instructions for Use
– SCHMIDT
®
LED Measured Value Display MD 10.010
Page 13
Example application 2
– step by step
A flow sensor (measuring range: 60 m/s; output signal:
4 … 20 mA) is
installed into a tube with DN 50. Using the unfiltered measurement value
of flow velocity w
N
, the volume flow shall be calculated and displayed as
primary value (in m³/h).
The analog output of the display shall
use 4 … 20 mA to signal a scaled
volume flow: 4 mA
≙
0 m³/h and 20 mA
≙
200 m³/h.
In addition, a switching signal, delayed by 30 seconds is required as soon
as 150 m³/h are exceeded, the hysteresis is 10 m
3
/h.
- Determination of the maximum volume flow based on the maximum
flow velocity and the pipe diameter: 60 m/s
≙
343 m³/h
Available from the sensor
’s instruction manual or by means of the
SCHMIDT
®
flow calculator:
www.schmidt-sensors.com/stroemungsrechner/volumenstrom-geschwindigkeit.html
- Install LED display in desired position
- Plug jumper in housing cover for
“current measurement”
- Connect supply voltage of sensor to LED display
- Connect analog output of sensor to LED display
- Connect analog output and relay output 1 of LED display
- Connect supply voltage of LED display and close its housing
- After switching on the supply voltage:
Initialization,
followed by indication of an “unconfigured” measurement
value on the main display
Call-up of configuration menu by pushing
for 2 seconds
Auxiliary
display
Main
display
Description
Averaging of measurement value: Deactivated
Configuration of analog input
Signal mode: 4 ... 20 mA
.
Accuracy of indication: 1 decimal
.
Start value: 0 m³/h (
≙
4 mA )
.
End value: 343 m³/h (
≙
20 mA )
Configuration of alarm output 1
Alarm output: Activated
Switching mode: Active when exceeding
.
Switching point: 150 m³/h
