AC/DC Current transducer AHR-B420
The transducer for the electronic measurement of DC & distorted AC
waveform currents, with galvanic isolation between the primary circuit
(power) and the secondary circuit (measurement).
True r.m.s. 4-20 mA current output.
I
PN
= 500 .. 2000 A
Electrical data
Primary nominal
DC & AC current
I
PN
(At rms)
500
800
1000
1500
2000
Primary AC current
max. peak value
1)
I
P
(A)
2000
2500
2000
2500
3000
Output currentt
I
OUT
(mA DC)
4-20
4-20
4-20
4-20
4-20
AHR
AHR
AHR
AHR
AHR
500 B420
800 B420
1000 B420
1500 B420
2000 B420
Type
Features
•
DC + distorted AC waveform currents
measurement
•
True r.m.s. output
•
Busbar or panel mounting
•
Split core type
•
Insulated plastic case recognized
according to UL94-V0.
R
L
V
C
I
C
I
SL
Î
P
Load resistance
Supply voltage
Current consumption
Output current limitation
Overload capability (Ampere Turns)
< 300
Ω
+ 20 .. 50 V DC
30 mA +
I
OUT
< 25
mA
30000
At
Advantages
•
High isolation between primary and
secondary circuits
•
Eliminates insertion loss
•
Easy installation.
Performance data
X
ε
L
I
OE
TCI
OE
TCG
t
r
BW
Accuracy @
I
PN
,
T
A
= 25°C (excluding offset)
Linearity error (1% of
I
PN
.. ±
I
PN
)
Electrical offset current,
T
A
= 25°C
Temperature coefficient of
I
OE
( 0 .. + 60 °C)
(- 40..+ 70 °C)
Temperature coefficient of
G
(% of reading)
Response time to 90% of
I
PN
step
Frequency bandwidth (±1 dB)
< ± 1 % of
I
PN
< ± 1.0 % of
I
PN
4 mA <±1.0 % of
I
PN
Applications
•
AC power supplies or Motors:
True r.m.s. current sensing - the most
accurate way to monitor power supply
or motor input power
•
VFD Controlled Loads:
± 3.2
µA/K
± 6.4
µA/K
± 0.15
%/K
< 150
ms
DC 20 .. 6000Hz
General data
T
A
T
S
m
IPxx
Ambient operating temperature
Ambient storage temperature
Mass
Protection degree
- 40 .. + 70
- 40 .. + 85
260
IP20
°C
°C
g
VFD output current monitoring to
indicate how the motor and the
attached load are operating
•
SCRs or Switch-mode Rectifiers:
Accurate measurement of output
current
•
Renewable Energy Installations or
Backup Batteries:
Continuous condition minitoring
allowing automatic failure detection/
anticipation.
Note :
1)
The max. peak AC current is the highest peak level of the primary signal that is
taken into account for accurate true r.m.s. calculation. Yet the device is designed
for maximum continuous true r.m.s. value equal to I
PN
, whereas the output is limited
by the above specified output limitation.
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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
LEM [ LEM ]
