060816/5
LEM www.lem.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. Page 1/2
AC Current transducer AKR-B420L
A Split Core transducer for the electronic measurement AC waveforms
current, with galvanic isolation between the primary (High power) and
the secondary circuits (Electronic circuit). Jumper selectable ranges
and True RMS 4-20mA current output.
Electrical data
Primary Nominal Current Analogue Output Signal1) Type RoHS
IPN (A.t.RMS) IOUT (mA) Date Code
2,5 4-20 AKR 5 B420L JUNE 2006
10,20,50 4-20 AKR 50 B420L planned
100,150,200 4-20 AKR 200 B420L planned
Vc Supply voltage (Loop powered) 24 V DC
RLLoad resistance see power supply diagram
VbRated voltage (CAT III, PD2) 150 V AC
VdRMS Isolation voltage test, 50 Hz, 1mn 3 kV AC
fFrequency bandwith 10-400 Hz
Accuracy - Dynamic performance data
XAccuracy @ IPN, TA=25°C ± 1 %
trResponse time @ 90% of IPN < 600 mS
General data
TAAmbient operating temperature (0-95% RH) - 20 ..+ 50 °C
TSAmbient storage temperature - 20 ..+ 85 °C
mMass 120 g
Safety IEC 61010-1
EMC EN 61326
Note:1) For 4-20mA output model, no saturation output up to 23 mA.
Selecting the transducer
VFD (Variable Frequency Drive) and SCR (Semi Conductor Rectifier) output
waveforms are rough approximations of a sine wave. There are numerous spikes
and dips in each cycle. AKR transducers use a mathematical algorithm called
“True RMS,” which integrates the actual waveform over time. True RMS is the only
way to accurately measure distorted AC waveforms. Select AKR transducers for
nonlinear loads or in “noisy” power environments.
IPN = 2..200A
Features
• VFD and SCR waveforms current
measurement
• True RMS responding
• Split core box
• Current output
• Loop powered transducers
• Panel mounting
• Jumper selectable ranges
Advantages
• Large aperture
• High isolation between primary and
secondary circuits
• Easy to mount
Applications
• VFD Controlled Loads: VFD output
indicates how the motor and
attached load are operating.
• SCR Controlled Loads:
Acurate measurement of phase
angle fired or burst fired (time
proportioned) SCRs.
• Switching Power Supplies and
Electronic Ballasts: True RMS sensing
is the most accurate way to
measure power supply or ballast
input power.
Options on request
• DIN mounting
LEM www.lem.com
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. 060816/5
Dimensions AKR-B420L (unit : mm, 1mm = 0.0394 inch)
Mechanical characteristics
• General tolerance ± 1 mm
• Primary aperture 21.7 mm sq.
• Panel mounting 2 holes ∅ 4.5mm
Distance between holes 77.3 mm
Connections
• 2 x UNC8 Cylindric Head
Power Supply diagram
3
.2
4.5
13 89.7
13
77.3
30
57.2
61
21.7
21.7
61
Remark
• Temperature of the primary conductor should not
exceed 60°C.
