Current Transducer LA 25-NP/SP14
For the electronic measurement of currents : DC, AC, pulsed,
mixed, with a galvanic isolation between the primary circuit
(high power) and the secondary circuit (electronic circuit).
Electrical data
I
PN
Primary nominal r.m.s. current
0.25
A
I
P
Primary current, measuring range
0 .. 0.36
A
R
M
Measuring resistance
R
M min
R
M max
with 15 V
@ 0.25 A
max
100
320
@ 0.36 A
max
100
190
I
SN
Secondary nominal r.m.s. current
25
mA
K
N
Conversion ratio
100 : 1000
V
C
Supply voltage ( 5 %)
15
V
I
C
Current consumption
10 + I
S
mA
V
d
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
2.5
kV
V
b
R.m.s. rated voltage
1)
, safe separation
600
V
basic isolation
1700
V
Accuracy - Dynamic performance data
X
Typical accuracy @ I
PN
, T
A
= 25C
0.5
%
L
Linearity
< 0.2
%
Typ
Max
I
O
Offset current
2)
@ I
P
= 0, T
A
= 25C
0.05 0.15 mA
I
OM
Residual current
3)
@ I
P
= 0, after an overload of 3 x I
PN
0.05 0.15 mA
I
OT
Thermal drift of I
O
- 10C .. + 70C
0.10 0.35 mA
t
r
Response time
4)
@ 90 % of I
P max
< 1
s
f
Frequency bandwidth (- 1 dB)
DC .. 150
kHz
General data
T
A
Ambient operating temperature
- 10 .. + 70
C
T
S
Ambient storage temperature
- 25 .. + 85
C
R
P
Primary coil resistance @ T
A
= 25C
< 745
m
R
S
Secondary coil resistance @ T
A
= 70C
110
L
P
Primary insertion inductance
496
H
R
IS
Isolation resistance @ 500 V, T
A
= 25C
> 1500
M
m
Mass
22
g
Standards
5)
EN 50178
Notes :
1)
Pollution class 2
2)
Measurement carried out after 15 mn functionning
3)
The result of the coercive field of the magnetic circuit
4)
With a di/dt of 100 A/s
5)
A list of corresponding tests is available
Features
Closed loop (compensated) multi-
turns current transducer using the
Hall effect
Insulated plastic case recognized
according to UL 94-V0.
Special features
I
PN
= 0.25
A
I
P
= 0 .. 0.36
A
K
N
= 100 : 1000
T
A
= - 10C .. + 70C.
Advantages
Excellent accuracy
Very good linearity
Low temperature drift
Optimized response time
Wide frequency bandwidth
No insertion losses
High immunity to external
interference
Current overload capability.
Applications
AC variable speed drives and servo
motor drives
Static converters for DC motor drives
Battery supplied applications
Uninterruptible Power Supplies
(UPS)
Switched Mode Power Supplies
(SMPS)
Power supplies for welding
applications.
I
PN
= 0.25
A
990126/2
LEM Components
w w w .lem.com
Dimensions LA 25-NP/SP14
(in mm. 1 mm = 0.0394 inch)
Secondary terminals
Terminal + : supply voltage + 15 V
Terminal M : measure
Terminal - : supply voltage - 15 V
Connection
Remark
I
S
is positive when I
P
flows from terminal + to terminal -.
Mechanical characteristics
General tolerance
0.2 mm
Fastening & connection of primary
2 pins
0.635 x 0.635 mm
Fastening & connection of secondary 3 pins
1 mm
Recommended PCB hole
1.2 mm
Right view
Bottom view
Top view
Back view
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
swiss
made
Standard 00 Year Week
or N SP..
in
out
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