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hey this is tim today i'm going to
answer our 40 20 milliamp
troubleshooting question from
christopher who asks how can we test 4
to 20 milliamp sensors that aren't
powered up i'll show you how i do it out
in the field and all you need is a
portable power supply and a basic 10
meter and for my portable power supply i
actually use the plc tools sim alp2 that
we use to simulate the sensor out in the
field it also has a voltage source mode
and in voltage source mode
you can power up to
10 volt
and 10 volt is going to be enough
to power up your typical 4 to 20
milliamp sensor so what i'm going to do
is take a cable and connect it to my
sensor and in this case
terminals one two and three are the ones
we need one's going to be our plus
voltage two is going to be our analog
signal and three is going to be our
minus and if we look at our analog
simulator while it is in voltage mode
then we see red is the plc input and
black is the common that means red is
putting out the plus 10 volt and the
black is the common so i am going to
take terminal number one
and i am going to put it underneath
our red post
then i'm going to take terminal number
three and i'm gonna put it under the
black post
now that will get us powered up but now
we need to get the meter into it all set
so for our meter our black one will be
our common and our red one will be our
milliamp input and i'm gonna put it over
here on
20
milliamps
so i'm going to put the black lead
underneath the black post along with
that wire that was going to terminal
number three
then all i have to do is take the red
lead of my meter and touch it to
terminal number three so i have my meter
at 10 volt
and now we can see
that we're getting a signal it's showing
roughly 11 milliamp right now and i
often get everything in my hands here
i'm showing
i'm showing roughly 10
or 11 milliamp and as i get it closer
here because this is inductive
and you see it goes down and so here i
can test this sensor
and make sure it works
simply by using a portable power supply
now
sometimes you can actually get this to
work with a 9 volt battery it's always
marginal with that because like this
particular sensor here is 10 to 24 volt
and so sometimes they'll power up
sometimes they want to learn more about
milliamp signals click here
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