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AC Current transducer APR-B420L
Split-core transducer for the electronic measurement of AC currents (all
waveforms), with galvanic isolation between the primary circuit (high
power) and the secondary circuit (electronics). Switch selectable
measuring ranges and True RMS 4-20mA current output (loop powered).
Electrical data
I PN = 10 .. 400 A
Primary Nominal Current
I PN (A.t.rms)
Output Current
I OUT (mA)
Type
RoHS since
date code
Features
? VFD and SCR waveform currents
10,25,50
50,75,100
100,150,200
200,300,400
4-20
4-20
4-20
4-20
APR
APR
APR
APR
50 B420L
100 B420L
200 B420L
400 B420L
46354
47009
46317
46291
measurement
? True RMS output
? Split-core type
? Loop powered 4-20mA current output
R L
V C
I SL
? P
Load resistance, with V C = + 24 V DC 1)
Supply voltage (loop powered)
Output current limitation 2)
Overload capability 3)
< 350 ?
+ 12 .. 24 V DC
< 25 mA
no limitation
? DIN rail or Panel mounting
? Switch selectable measuring ranges
? Isolated plastic case recognized
according to UL94-V0.
Accuracy-Dynamic performance data
Advantages
% of I PN
X
ε L
I OE
TCI OE
TCI OUT
t r
Accuracy @ I PN , T A = 25°C (excluding offset)
Linearity error (0 .. ± I PN )
Electrical offset current @ T A = 25°C
Temperature coefficient of I OE
Temperature coefficient of I OUT (% of reading)
Response time to 90% of I PN step
<±1
< ± 0.5 % of I PN
4 mA
±1 μ A/K
± 0.1 %/K
< 400 ms
? Large aperture for cable up to
?18mm
? High isolation between primary and
secondary circuits
? Eliminates insertion loss
? Easy installation
BW
Frequency bandwidth (± 1 %)
30 .. 6000
Hz
Applications
Load Resistance v s. Supply Voltage
? VFD Controlled Loads:
Notes :
1)
Max. Load Resistance vs. Supply Voltage
VFD output indicates how the motor
and attached load are operating.
30
25
20
15
10
? SCR Controlled Loads:
Acurate measurement of phase
angle fired or burst fired (time
proportioned)
SCRs. Current measurement gives
faster response than temperature
5
0
0
50
100
150
200
250
300
350
400
measurement.
? Switching Power Supplies and
Electronic Ballasts:
True RMS sensing is the most
Load Resistance
accurate way to measure power
2)
3)
The output current will never exceed this value for safety and protection
reasons. The output value is not valid when measuring above the primary
nominal current value.
Although the transducer can withstand very high currents, the measuring
performance specified in the datasheet is valid within the 4-20 mA output
supply or ballast input power.
Application domain
? Energy and Automation
range only.
Page 1/4
071022/6
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
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