0:07
in this video we will discuss about the
0:13
transmitter output current signal values
0:17
with respect to the tank
0:20
level let's suppose the tank level is
0:26
0% and the level transmitter will send
0:35
PLC if you see what is the current range
0:43
mamp the four represents the 0% signal
0:50
variable that is why the tank level is
0:54
0% the transmitter is sending 4 mil
0:59
current signal to the
1:02
PLC the PLC receives the 4 mamp signal
1:08
and calculates the tank
1:12
level finally it will update the tank
1:16
level on the computer
1:18
Graphics the level is 0
1:23
percentage let's say the tank level is
1:30
now the transmitter sends 8
1:35
mamp current signal to the
1:42
PLC receives this current signal and
1:46
calculates the tank level which is
1:51
25% and displays on the
2:02
50% the transmitter sends 12 mamp
2:07
current signal to the
2:10
PLC and PLC updates the computer
2:15
Graphics value the tank level value to
2:21
50% now again the tank level reaches
2:27
75% then the transmitter ends 16
2:34
PLC now PLC calculates the tank level
2:44
graphics next the tank level is
2:49
100% the transmitter sends 20 milliamp
2:53
the maximum current value which is
2:56
20 current signal to the plc
3:00
PLC calculates the tank level based on
3:03
the received current signal and updates
3:07
the tank level value on the graphics
3:13
percentage remember in this course our
3:17
main focus is on 4 to 20 mamp
3:23
signals we are not going to discuss
3:26
about how the PLC is calculating these
3:30
are how it is updating these values on
3:34
graphics these are different
3:37
topics what I want you to understand is
3:41
the basic concept for any instrument not
3:48
transmitter it may be flow transmitter
3:52
it may be temperature transmitter it may
3:56
transmitter it may be a analyzer
4:00
it may be a electrical BFD drive or any
4:06
device okay the concept is
4:10
similar just consider in percentage so
4:14
that it will be easy for you to
4:19
concept at 0 percentage transmitter
4:24
milliamp that is the zero scale and at
4:28
100 percentage is the transmitter sends
4:32
20 mamp to the PLC and it is a full
4:36
scale value in terms of percentage 0%
4:41
and 100 percentage and in terms of
4:44
current it is 4 milliamp and 20
4:50
mamp so this is how the transmitter
4:53
sends the current signal and the PLC
4:57
calculates the equivalent
5:03
value understand this concept is same
5:07
for every instrument which is a analog
5:11
input to a PLC or a DCS or any type of
5:16
controller based on 4 to 20
5:23
milliamp thank you I will meet you in
