Datasheet
Electrical data
Primary Nominal Primary AC Current Analogue Output Type
DC & AC Current Max. Peak Value
(
*
)
Signal
I
PN
(A.t.RMS) I
P
(A) I
OUT
(mADC)
100 600 4-20 DHR 100 C420
200 600 4-20 DHR 200 C420
300 1000 4-20 DHR 300 C420
400 1000 4-20 DHR 400 C420
500 1800 4-20 DHR 500 C420
600 1800 4-20 DHR 600 C420
1000 1800 4-20 DHR 1000 C420
R
L
Load resistance < 300 Ω
V
C
Supply voltage (loop powered) +20 .. 50 V DC
I
C
Current consumption 30 mA + I
OUT
Limitation of output current < 25 mA
Overloaded input current (Ampere Turns) 30000 A.t
Accuracy-Dynamic performance data
X Accuracy @ I
PN
, T
A
= 25°C (without offset) < ±1 % of I
PN
ε
L
Linearity (1% of I
PN
.. ± I
PN
) < ±1.0 % of I
PN
I
OE
Electrical offset current, T
A
= 25°C 4 mA
I
OT
Thermal drift of I
OE
( 0..+60 °C) ±3.2 µA/K
(-40..+70 °C) ±6.4 µA/K
TCε
G
Thermal drift of the gain including offset (% of reading) ±0.1 %/K
t
r
Response time @ 90% of I
P
< 150 m s
f Frequency bandwidth (±1%) DC 20..6000Hz
General data
T
A
Ambient operating temperature -40 .. +70 °C
T
S
Ambient storage temperature -40 .. +85 °C
m Mass 260 g
Protection type IP20
UL94 classification V0
Notes : - 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.
(
*
)
The Max. Peak AC Current is the highest peak level of the primary signal that is
taken into account for accurate True RMS calculation. Yet the device is designed for
maximum continuous True RMS value equal to I
PN
, whereas the output is limited by
the above specified output limitation.
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.
I
PN
= 100..1000 A
Features
• VFD and SCR waveforms current
measurement
• True RMS output
• 4-20mA current output
• Panel mounting
• Eliminates insertion loss
Advantages
• Large aperture for cable up to
Ø32mm
• 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. Current measurement gives
faster response than temperature
measurement.
• Switching Power Supplies and
Electronic Ballasts:
True RMS sensing is the most
accurate way to measure power
supply or ballast input power.
051005/8
LEM Components www.lem.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. Page 1/3
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