4-20 mA and Fieldbus Instruments

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In this video, I will show you both 4 to
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20 millia based instruments and
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foundation field bus based instruments.
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If you see here, these are flow
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transmitters.
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On the right side, we have one flow
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transmitter and on the left side also we
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have one flow transmitter. These two are
0:25
DP type instruments. differential
0:28
pressure based flow meters.
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If you see on the right side, this is a
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hot based 4 to 20 milliamp transmitter.
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This instrument receives this
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differential pressure
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and then calculates the equivalent 4 to
0:49
20 milliamp signal.
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And we are using a two- wire instrument.
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That is why we have only one pair cable
0:57
is connected. Using this one pair cable,
1:00
this instrument sends 4 to 20 millia
1:04
signal to the DCS system.
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On the left side, if you see this is a
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foundation field bus instrument. If you
1:16
look closely both instruments are
1:20
visually same. See this is the FF
1:24
instrument
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and
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this is the heart instrument I mean 4 to
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20 millia based instrument. Is there any
1:35
difference
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by looking at these instruments?
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Instrument wise there is no difference.
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Okay. But if you see the cable
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for foundation field bus, we use this
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orange color cable as per the standard.
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But for hot protocol mostly we use blue
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color cable
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and you can find this uh details by
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looking at the name plate of this
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transmitter.
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The output is FF R hot. Okay, you can
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know the signal details by looking at
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the name plate. But if you look from a
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distance, both instruments looks like
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same except this cable. So whenever you
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are working in a field you can identify
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the
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transmitter type easily by looking at
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the cable cable color. You can also go
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and see the name plate but uh it is the
2:48
easiest way.

4-20 mA and Fieldbus Instruments

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4-20 mA and Fieldbus Instruments

Instrumentation Tools