LEM Components
AC/DC Current transducer DHR-C420
The transducer for the electronic measurement DC & distorted AC
waveforms current, with galvanic isolation between the primary (High
power) and the secondary circuits (Electronic circuit). True RMS 4-
20mA current output.
DC & AC Current
R
V
I
X
I
I
TC
t
f
T
T
m
Notes :
Primary Nominal
C
OE
OT
I
r
A
S
C
PN
L
L
Accuracy-Dynamic performance data
Electrical data
100
200
300
400
500
600
1000
General data
(A.t.RMS)
G
Installation and maintenance should be done with power supply disconnected.
The operator must have accrediation to install this material.
The users must take care of all protection gurantee against electrical shock.
Load resistance
Supply voltage (loop powered)
Current consumption
Limitation of output current
Overloaded input current (Ampere Turns)
Accuracy @ I
Linearity (1% of I
Electrical offset current, T
Thermal drift of I
Thermal drift of the gain (% of reading)
Response time @ 90% of I
Frequency bandwidth (±1%)
Ambient operating temperature
Ambient storage temperature
Mass
Protection type
UL94 classification
Primary AC Current
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Max. Peak Value
PN
600
600
1000
1000
1800
1800
1800
, T
I
P
OE
PN
(A)
A
= 25°C (without offset)
.. ± I
(-20..+60 °C)
(-40..+70 °C)
PN
)
A
= 25°C
P
Analogue Output
I
OUT
Signal
4-20
4-20
4-20
4-20
4-20
4-20
4-20
(mADC)
DHR 100 C420
DHR 200 C420
DHR 300 C420
DHR 400 C420
DHR 500 C420
DHR 600 C420
DHR 1000 C420
< 300
+20 .. 50 V DC
30 mA + I
< 25
30000
< ±1
< ±1.0 % of I
4
±1.6
±3.2
±0.1
DC 20..6000Hz
-40 .. +70
-40 .. +85
260
IP20
V0
< 150
Type
% of I
OUT
%/K
mA
mA
A/K
A/K
m s
°C
°C
A.t
PN
PN
g
Features
Advantages
Applications
I
PN
measurement
True RMS output
Eliminates insertion loss
Ø32mm
secondary circuits
Electronic Ballasts:
4-20mA current output
Large aperture for cable up to
Easy to mount
VFD Controlled Loads:
VFD and SCR waveforms current
SCR Controlled Loads:
Switching Power Supplies and
Panel mounting
High isolation between primary and
VFD output indicates how the motor
and attached load are operating.
Acurate measurement of phase
angle fired or burst fired (time
proportioned)
SCRs. Current measurement gives
faster response than temperature
measurement.
True RMS sensing is the most
accurate way to measure power
supply or ballast input power.
= 100..1000 A
www.lem.com
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