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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.
IPN = 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.
RL VC IC ISL IP
Load resistance Supply voltage Current consumption Output current limitation Overload capability (Ampere Turns)
< 300 + 20 .. 50 V DC 30 mA + IOUT < 25 mA 30000 At
Advantages
* High isolation between primary and secondary circuits * Eliminates insertion loss * Easy installation.
Performance data
X
L
IOE TCIOE TCG tr BW
Accuracy @ IPN, TA = 25C (excluding offset) Linearity error (1% of IPN .. IPN) Electrical offset current, TA = 25C Temperature coefficient of IOE ( 0 .. + 60 C) (- 40..+ 70 C) Temperature coefficient of G (% of reading) Response time to 90% of IPN step Frequency bandwidth (1 dB)
< 1 % of IPN < 1.0 % of IPN
4 mA <1.0 % of IPN
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 A/K 6.4 A/K 0.15 %/K < 150 ms DC 20 .. 6000Hz
General data
TA TS 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.
Page 1/3
061012/4
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
Current Transducer AHR-B420
Isolation characteristics
Vb Rated isolation voltage rms 600 V with IEC 61010-1 according to the 61326 standards and following conditions: - Double insulation - Over voltage category CAT III - Pollution degree PD2 - Heterogeneous field Rms voltage for AC isolation test, 50Hz, 1min 5.2 kV Creepage distance 11 mm Clearance distance 11 mm Comparative tracking index (Group I) 600
Vd dCp dCl CTI
Output polarity with DC input
Output in mA 20
4 -Ipn +Ipn
Safety
This transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturer's operating instructions. Installation and maintenance should be done with main power supply disconnected. The operator must have an accreditation to install this material.
Caution! Risk of electrical shock When operating the transducer, certain parts of the module can carry hazardous voltage (e.g. primary conductor). Ignoring this warning can lead to injury and/or cause serious damage. The user must take care of all protection guarantee against electrical shock. This transducer is a built-in device, whose conducting parts must be inaccessible after installation. A protective housing or additional shield could be used.
Page 2/3
061012/4
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www.lem.com
Dimensions AHR-B420 (in mm. 1 mm = 0.0394 inch)
25
8.3 0
20
17 4 9.10
86
10 4
40
5 0.50
54.10 22. 28 20.34 35 15
15
5.5 0
37
55 110
15 0
Connections
* Wires up to 2 mm * Female connector provided (screw terminals)
Mechanical characteristics
* General tolerance * Primary aperture * Busbar fastening
Output Connector 1(Vcc) 2(Iout) 3(NC) 4(GND)
8 .30
1 mm 104 x 40 mm 1 hole 5.5 mm & 2 slots 5.5 x 30 mm 4 holes 3.2 mm 15 x 150 mm
AHR-C420
AHR
Panel mounting Distance between holes axes
Remarks
24 VDC Power (+) (-)
(-)
(+)
Load
(Controller, meter etc)
* The return busbar and primary conductor elbow must be located at least at a distance of 2.5 x the window length away from the transducer case. * The temperature of the primary busbar can not exceed 90C. * Dynamic performances are the best with a primary busbar completely filling the primary aperture. * This is a standard model. For different versions (supply voltages, different outputs, bidirectional measurements...), please contact us.
+24VDC OUT
Is
Ip
GND
25 .60
3
Page 3/3
061012/4
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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