page 1/3 9november2011/version 5 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com current transducer la 25-np/sp7 for the electronic measurement of currents: dc, ac, pulsed..., with galvanic isolation between the primary circuit and the secondary circuit. electrical data i pn primary nominal current rms 2.5 a i pm primary current, measuring range 0 .. 3.6 a r m measuring resistance r m min r m max with 15 v @ 2.5 a max 100 320 ? @ 3.6 a max 100 190 ? i sn secondary nominal current rms 25 ma k n conversion ratio 10 : 1000 v c supply voltage ( 5 %) 15 v i c current consumption 10 + i s ma accuracy - dynamic performance data x accuracy @ i pn , t a = 25c 0.5 % l linearity error < 0.2 % typ max i o offset current 1) @ i p = 0, t a = 25c 0.05 0.15 ma i om magnetic offset current 2) @ i p = 0 and specifed r m , after an overload of 3 x i pn 0.05 0.15 ma i ot temperature variation of i o 0c .. + 25c 0.06 0.25 ma + 25c .. + 70c 0.10 0.35 ma t r response time 3) to 90 % of i pn step < 1 s di/dt di/dt accurately followed > 50 a/s bw frequency bandwidth (- 1 db) dc .. 150 khz general data t a ambient operating temperature 0 .. + 70 c t s ambient storage temperature - 25 .. + 85 c r p primary coil resistance @ t a = 25c < 8.5 m? r s secondary coil resistance @ t a = 70c 110 ? l p insertion inductance 5.5 h r is isolation resistance @ 500 v, t a = 25c > 1500 m? m mass 22 g standards en 50178: 1997 notes: 1) measurement carried out after 15 mn functioning 2) the result of the coercive feld of the magnetic circuit 3) with a di/dt of 100 a/s. i pn = 2.5 a features closed loop (compensated) current transducer using the hall effect isolated plastic case recognized according to ul 94-v0. special features i pn = 2.5 a i pm = 0 .. 3.6 a k n = 10 : 1000. 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. application domain industrial. 16160
page 2/3 9november2011/version 5 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com current transducer la 25-np/sp7 isolation characteristics v d rms voltage for ac insulation test, 50 hz, 1 min 2.5 kv v w impulse withstand voltage 1.2/50 s 16 kv min dcp creepage distance 19.5 mm dci clearance 19.5 mm cti comparative tracking index (group iiia) 175 applications examples according to en 50178 and iec 61010-1 standards and following conditions: over voltage category ov 3 pollution degree pd2 non-uniform feld safety this transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturers operating instructions. caution, risk of electrical shock when operating the transducer, certain parts of the module can carry hazardous voltage (eg. primary busbar, power supply). ignoring this warning can lead to injury and/or cause serious damage. this transducer is a build-in device, whose conducting parts must be inaccessible after installation. a protective housing or additional shield could be used. main supply must be able to be disconnected. en 50178 iec 61010-1 dcp, dci, rated insulation voltage nominal voltage basic insulation 1600 v 1600 v reinforced insulation 800 v 800 v v w
page 3/3 9november2011/version 5 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice www.lem.com dimensions la 25-np/sp7 (in mm) 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 connection remark i s is positive when i p fows from terminal + to terminal -.
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