IN 1200-S

**Current Transducer IN 1200-S** 

## _I_ **= 1200 A** P N 

For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between the primary and the secondary circuit. 

## **Features** 

- ●Closed loop (compensated) current transducer using an 

   - extremely accurate zero flux detector 

- ●9-pin D-Sub male secondary connector 

- ●Status signal to indicate the transducer state 

- ●LED indicator confirms normal operation 

- ●Metal housing to improve immunity to EMC & power dissipation 

- ●Operating temperature −40 °C to 85 °C 

- ●Large aperture ⌀ 38 mm for cables and busbars. 

## **Advantages** 

- ●Very high accuracy 

- ●Excellent linearity 

- ●Extremely low temperature drift 

- ●Wide frequency bandwidth 

- ●High immunity to external fields 

- ●No insertion losses 

- ●Very low noise on output signal 

- ●Low noise feedback to primary conductor. 

## **Applications** 

- ●Feedback element in high performance gradient amplifiers for MRI 

- ●Feedback element in high-precision, high-stability power supplies 

- ●Calibration unit 

- ●Feedback element for Power Meter (e.g. EV Test Benches) 

- ●Medical equipment. 

## **Standards** 

IEC 61010-1 

EMC: 

- ●IEC 61000-6-2: 2016 

- ●IEC 61000-6-3: 2006 + A1 (2010) 

Safety: 

- ●IEC 61010-2-030: 2017 

- ●IEC 61010-1:2010/AMD1: 2016. 

## **Application Domains** 

- ●Industrial 

- ●Laboratory 

- ●Medical. 

N° 97.N6.62.000.0 

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LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

13May2022/Version 1 

**IN 1200-S** 

## **Safety** 

⚠ Caution 

If the device is used in a way that is not specified by the manufacturer, the protection provided by the device may be compromised. Always inspect the electronics unit and connecting cable before using this product and do not use it if damaged. Mounting assembly shall guarantee the maximum primary conductor temperature, fulfill clearance and creepage distance, minimize electric and magnetic coupling, and unless otherwise specified can be mounted in any orientation. 

Caution, risk of electrical shock 

This transducer must be used in limited-energy secondary circuits SELV according to IEC 61010-1, in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturer’s operating specifications. 

Use caution during installation and use of this product; certain parts of the module can carry hazardous voltages and high currents (e.g. primary conductor). 

Ignoring this warning can lead to injury and or/or cause serious damage. 

De-energize all circuits and hazardous live parts before installing the product. 

All installations, servicing operations and use must be carried out by trained and qualified personnel practicing applicable safety precautions. 

This transducer is a built-in device, no maintenance required; cleaning by dry compressed air is authorized. 

This transducer is a build-in device, whose hazardous live parts must be inaccessible after installation. This transducer must be mounted in a suitable end-enclosure. 

Besides make sure to have a distance of minimum 30 mm between the primary conductor (return bar) and the transducer and other neighboring components. 

Main supply must be able to be disconnected. 

Always inspect the current transducer for damage before using this product. 

Never connect or disconnect the external power supply while the primary circuit is connected to live parts. Never connect the output to any equipment with a common mode voltage to earth greater than 30 V. 

Always wear protective clothing and gloves if hazardous live parts are present in the installation where the measurement is carried out. 

Safe and trouble-free operation of this transducer can only be guaranteed if transport, storage and installation are carried out correctly and are carried out with care. 

The current transducer shall not be opened or modified. 

If not working, the current transducer shall be replaced by an equivalent device. 

## ESD susceptibility 

The product is susceptible to ESD damage if the secondary (D-Sub) connector pins are touched without being properly grounded. 

## Caution, hot surface 

Power supply cable must support a temperature of 100 °C at least and it must be fixed in a way to not be in contact with the product housing and primary conductor. 

Do not dispose of this product as unsorted municipal waste. Contact a qualified recycler for disposal. 

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13May2022/Version 1 

**IN 1200-S** 

## **Absolute maximum ratings** 

|**Parameter**|**Symbol**|**Unit**|**Value**|
|---|---|---|---|
|Maximum supply voltage (working) (−40 … 85 °C)|±_U_C max|V|16.5|
|Maximum primary conductor temperature|_T_B max|°C|100|



Absolute maximum ratings apply at 25 °C unless otherwise noted. 

Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability. 

## **Environmental and mechanical characteristics** 

|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
|Ambient operating temperature|_T_A|°C|−40||85||
|Ambient storage temperature|_T_A st|°C|−40||85||
|Relative humidity|_RH_|%|20||80|Non condensing|
|Dimensions||||||See drawing on<br>page 9|
|Mass|_m_|kg||1.3|||
|Altitude1)||m|||2000||
|Environmental conditions||||||Indoor|
|Cooling conditions||||||Natural<br>convection|
|Degree of protection against mechanical impacts||||IK 08||With busbar<br>completely<br>flling the<br>aperture|



## **Insulation coordination** 

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Parameter Symbol Unit Value Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Value**|**Comment**|
|---|---|---|---|---|
||||||
|RMS voltage for AC insulation test, 50 Hz, 1 min|_U_d|kV|4.2|Between primary and<br>secondary + shield|
|Impulse withstand voltage 1.2/50 μs|_U_Ni|kV|8||
|Clearance (pri. - sec.)2)|_d_CI|mm|11.5|Shortest distance through air|
|Creepage distance (pri. - sec.)2)|_d_Cp|mm|11.9|Shortest path along device body|
|Comparative tracking index|_CTI_||600||
|Rated insulation RMS voltage|_U_Nm|V|1000|Basic insulation<br>according to IEC 61010-1<br>CAT III, PD2|
|Rated insulation RMS voltage|||1000|Reinforced insulation<br>according to IEC 61010-1<br>CAT II, PD2|



- Notes: 1) Insulation coordination at 2000 m 

   - 2)  Mating connector not included in this calculation, which can degrade Clearance and Creepage distance depending on the material and dimensions of said mating connector. 

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13May2022/Version 1 

**IN 1200-S** 

## **Electrical data** 

At _T_ A = 25 °C, ± _U_ C  = ±15 V DC, unless otherwise noted (see Min, Max, typ, definition paragraph in page 5). 

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Parameter Symbol Unit Min Typ Max Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
||||||||
|Primary nominal DC current (continuous)|_I_P N DC|A|−1200||1200|_T_A= −40 ... 85 °C|
|Primary nominal AC RMS current (continuous)|_I_P N AC|A|−1200||1200|From −40 °C ... +50 °C<br>only; see note1)for<br>other limitations|
|Peak primary current, measuring range|_Î_P M|A|−1500||1500|With ±_U_C= 14.25 V,<br>_T_A= −40 ... 85 °C,<br>_R_M= 1 Ω;|
|Measuring resistance|_R_M|Ω|0||1|for other values see<br>curvespage 7|
|Secondary nominal RMS current|_I_S N|A|−0.8||0.8||
|Maximum withstand primary peak current2)|_Î_P max|kA|−5||5|Non repetitive pulse<br>100 ms|
|Resistance of secondary winding|_R_S|Ω||8||@ 25 °C|
|Number of secondary turns|_N_S|||1500|||
|DC supply voltage⎓|_+U_C|V|14.25|15|15.75||
|DC supply voltage⎓|−_U_C|V|−14.25|−15|−15.75||
|DC current consumption⎓|_+I_C|A||0.13||@_I_P= 0|
|||||0.93||@_I_P=_I_P N|
|||||1.12||@_I_P=_I_P M|
|DC current consumption⎓|−_I_C|A||0.06||@_I_P= 0|
|||||0.86||@_I_P=_I_P N|
|||||1.07||@_I_P=_I_P M|
|RMS noise current 0 ... 10 Hz referred to primary3)|_I_no|ppm||0.05|0.1||
|RMS noise current 0 ... 10 kHz referred to primary3)||||1.5|4||
|RMS noise current 0 ... 100 kHz referred to primary3)||||3.5|10||
|Peak-to-peak noise current3)|_I_no pp|ppm||18|34||
|Fluxgate excitation frequency||kHz||15.625||_T_A= −40 ... 85 °C|
|Electrical ofset current referred to primary3)|_I_O E|ppm|−10||10|@ 25 °C|
|Temperature coefcient of_I_O Ereferred to primary3)|_TCI_O E|ppm/K|−0.3||0.3|_T_A= −40 ... 85 °C|
|Ofset stability3)||ppm/month|−0.1||0.1||
|Linearity error3)|_ε_L|ppm|−2|1|2||
||||−3|1|3|_T_A= −40 ... 85 °C|
|Delay time to 10 % of the fnal output value for_I_P Nstep|_t_D 10|µs|||< 1||
|Delay time to 90 % of the fnal output value for_I_P Nstep|_t_D 90|µs|||< 1|d_i_/d_t_of 100 A/µs|
|Frequency bandwidth (±1 dB)|_BW_|kHz||230||Small-signal<br>bandwidth,<br>1.5 % of_I_P N|
|Frequency bandwidth (±3 dB)||||440|||
|Start-up time|_t_start|s|||< 15|_T_A= −40 ... 85 °C|
|Notes: 1)To ensure measurements of 1200 A RMS continuous, the ambient temperature should not exceed 50 °C, the cable length should be less<br>than 3 meters with a wire cross section greater than 0.74 mm2(18 AWG) and the burden resistance should be less than 1 Ohm.<br>Ensure the power supply voltage will never drop below ±14.25 V under any circumstances.|||||||



2) Single pulse only, not AC. The transducer may require a few seconds to return to normal operation when autoreset system is running. 3) All ppm figures refer to full-scale which corresponds to a secondary nominal RMS current. 

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13May2022/Version 1 LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

**IN 1200-S** 

## **Definition of typical, minimum and maximum values** 

Minimum and maximum values for specified limiting and safety conditions have to be understood as such as well as values shown in “typical” graphs. 

On the other hand, measured values are part of a statistical distribution that can be specified by an interval with upper and lower limits and a probability for measured values to lie within this interval. 

Unless otherwise stated (e.g. “100 % tested”), the LEM definition for such intervals designated with “min” and “max” is that the probability for values of samples to lie in this interval is 99.73 %. 

For a normal (Gaussian) distribution, this corresponds to an interval between −3 sigma and +3 sigma. If “typical” values are not obviously mean or average values, those values are defined to delimit intervals with a probability of 68.27 %, corresponding to an interval between −sigma and +sigma for a normal distribution. 

Typical, maximal and minimal values are determined during the initial characterization of the product. 

## **Power supply and load** 

In order to reach the measuring range according to the maximum measuring resistor, be careful with the setup measurement when wires length are high. It means that: 

- ●the wires resistance could be not negligible 

- ●the voltage at the output of the DC power supply and the voltage at the transducer could be significantly different. 

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ℓ<br>S<br>+  U C R W1 +  U C Transducer<br>0V<br>-  U 0VC RR W1W1 -  U C<br>R LOAD<br>Minimum ±  U C  -5% must be<br>seen by the transducer<br>DC power<br>supply<br>R W wires<br>resistance could<br>be not negligible<br>W2<br>R<br>OUTPUT OUTPUT RETURN<br>W2<br>R<br>**----- End of picture text -----**<br>


_R_ W wire resistance in Ω is: 

ℓ _R_ W = ρ S 

S: Cross section of wire in m[2 ] 

- ℓ: Wire length in m 

- ρ: Resistivity of material in Ω.m 

## **Total measuring resistance is:** 

_R_ M = _R_ L + 2 × _R_ W1 + 2 × _R_ W2 

If _R_ W1 = _R_ W2 = _R_ WIRE then _R_ M = _R_ L + 4 × _R_ WIRE 

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LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

13May2022/Version 1 

**IN 1200-S** 

## **Overload protection - Electrical specification - Status** 

The overload occurs when the primary current _I_ P  exceeds a trip level such that the fluxgate detector becomes completely saturated and, consequently, the transducer will switch from normal operation to overload mode. 

This trip level is guaranteed to be greater than _I_ P M and its actual value depends on operating conditions such as temperature and measuring resistance. 

When this happens, the transducer will automatically begin to sweep in order to lock on the primary current again. 

The overload conditions will be: 

- ●The secondary current _I_ S generated is a low frequency signal. 

- ●The signal normal operation status (between pin 3 and 8 of the D-sub connector) switches to _U_ + or ≈ 0.7 V. See the status port wiring below. 

- ●The green LED indicator (normal operation status) turns off. 

The measuring can resume when the primary current returns in the measuring range between − _I_ P N  and + _I_ P N. Then the signal normal operation status switches to GND and the green LED indicator (normal operation status) switches on. 

## **Status/Interlock port wiring** 

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U + : 4 ... +24V<br>DC<br>Power<br>Supply<br>I C E max : 30 mA<br>I C E min  :   2 mA<br>Normal operation<br>status<br>U+ (V) − 0.4 V<br>30 mA<br>U+ (V) −0.4 V<br>2 mA<br>DC<br>I C E max : 30 mA Power<br>I C E min  :   2 mA Supply<br>Normal operation<br>status<br>U+ (V) −0.4 V<br>30 mA<br>U+ (V) −0.4 V<br>2 mA<br>R<br>D-Sub9<br>Pin<br>Collector<br>D-Sub9<br>Pin<br>Emitter<br>D-Sub9<br>Pin<br>Collector<br>D-Sub9<br>Pin<br>Emitter<br>R<br>Normal operation<br>status is : Active Low<br>8<br>The optocoupler is driven as follows:<br>ON   : Transducer is OK<br>OFF : Transducer is not OK<br>R  min (kΩ) =<br>3<br>R  max (kΩ) =<br>TRANSDUCER USER SIDE<br>Normal operation  U+ : 4 ... +24V<br>status is : Active High<br>8<br>The optocoupler is driven as follows:<br>ON   : Transducer is OK<br>OFF : Transducer is not OK<br>3<br>R  min (kΩ) =<br>R  max (kΩ) =<br>TRANSDUCER USER SIDE<br>**----- End of picture text -----**<br>


The following table shows how the normal operation status acts as below: 

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Status Value Description<br>**----- End of picture text -----**<br>


|**Status**|**Value**|**Description**|
|---|---|---|
||||
|Active Low|≈ 0.7 V|The transducer is OK (Normal operation)|
||_U+_|The transducer is not OK (Overload mode or supply fault)|
|Active High|_U+_|The transducer is OK (Normal operation)|
||≈ 0.7 V|The transducer is not OK (Overload mode or supply fault)|



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13May2022/Version 1 

**IN 1200-S** 

## **Maximum measuring resistance versus primary current and temperature** 

± _U_ C  = ±14.25 V 

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20<br>19 +85°C<br>+25°C<br>18 -40°C<br>+50°C<br>17<br>16<br>15<br>14<br>13<br>12<br>11<br>10<br>9<br>8<br>7<br>6<br>5<br>4<br>3<br>2<br>1<br>0<br>500 600 700 800 900 1000 1100 1200 1300 1400 1500<br>I P (A RMS)<br> max (Ohm) R M<br>**----- End of picture text -----**<br>


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20<br>19 +85°C<br>+25°C<br>18 -40°C<br>+50°C<br>17<br>16<br>15<br>14<br>13<br>12<br>11<br>10<br>9<br>8<br>7<br>6<br>5<br>4<br>3<br>2<br>1<br>0<br>500 600 700 800 900 1000 1100 1200 1300 1400 1500<br>I P (App)<br> max (Ohm) R M<br>**----- End of picture text -----**<br>


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13May2022/Version 1 

**IN 1200-S** 

## **Performance parameters definition** 

The schematic used to measure all electrical parameters is shown below: 

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I P I S I S U C<br>R M U C<br>Normal operation status<br>Normal operation status<br>Ground<br>**----- End of picture text -----**<br>


## **Transducer simplified model** 

The static model of the transducer at temperature _T_ A is: 

**==> picture [63 x 10] intentionally omitted <==**

In which 

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## **Linearity** 

To measure linearity, the primary current (DC) is cycled from 0 to the maximum positive or negative difference between the _I_ P M, then to − _I_ P M and back to 0. The linearity error _ε_ L is measured points and the linear regression line, expressed in parts per million (ppm) of full-scale which corresponds to the maximum measured value. 

## **Electrical offset** 

The electrical offset current _I_ O E is the residual output current when the input current is zero. 

The temperature variation _I_ O _T_ of the electrical offset current _I_ O E is the variation of the electrical offset from 25 °C to the considered temperature. 

## **Delay times** 

respect to the primary are shown in the next figure.The delay time _t_ D 10 @ 10 % and the delay time _t_ D 90 @ 90 % with Both slightly depend on the primary current d _i_ /d _t_ . They are measured at nominal current. 

Where, 

**==> picture [149 x 11] intentionally omitted <==**

_I_ S : secondary current (A) _N_ P/ _N_ S : turns ratio (1: _N_ S) _I_ P : primary current (A) _I_ P M : primary current, measuring range (A) _T_ A : ambient operating temperature (°C) _I_ O E : electrical offset current (A) _I_ O _T_ : temperature variation of _I_ O E at _T_ A (A) _ε_ L : linearity error 

This is the absolute maximum error. As all errors are independent, a more realistic way to calculate the error would be to use the following formula: 

**==> picture [168 x 115] intentionally omitted <==**

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I<br>100 %<br>90 %<br>I P IS<br>t D 90<br>10 %<br>t D 10 t<br>**----- End of picture text -----**<br>


_t_ D 10 (delay time @ 10 %) and _t_ D 90 (delay time @ 90 %) 

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N<br>2<br>ε = ε<br>∑ 𝑖𝑖<br>𝑖𝑖  =1<br>**----- End of picture text -----**<br>


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13May2022/Version 1 

**IN 1200-S** 

## **Dimensions** (in mm) 

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Connection<br>**----- End of picture text -----**<br>


## **Connection** 

- ●Normal operation status (Pins 3 and 8) Normal operation means: 

   - ±15 V (± _U_ C) present 

   - 0 V on D-Sub has to be tied 

   - zero detector is working 

   - compensation current  ≤ _I_ P M DC 

   - green LED indicator switches on. 

- ●Direct current ⎓ (DC) 

## **Mechanical characteristics** 

- ●General tolerance 

±0.5 mm 

- ●Transducer fastening 

   - Horizontal mounting 4 slotted holes 

⌀ 5.5 mm 

4 M5 steel screws 

## **Remarks** 

- _I_ S is positive when _I_ P flows in the direction of the arrow. 

- ●We recommend that a shielded output cable and plug are used to ensure the maximum immunity against electrostatic fields. 

- ●Temperature of the primary conductor should not exceed 100 °C. 

- ●We recommend to fix the potential of the housing to the ground or 0 V (on indicated surfaces). 

- ●Installation of the transducer must be done unless otherwise specified on the datasheet, according to LEM Transducer Generic Mounting Rules. Please refer to LEM document N°ANE120504 available on our Web site: **https://www.lem.com/en/fle/3137/download/.** 

- ●All mounting recommendations are given for a standard mounting. Screws with flat and spring washers. 

Recommended fastening torque 3.7 N ⋅ m - Vertical mounting 2 slotted holes 

⌀ 6.5 mm 

2 M6 steel screws 

Recommended fastening torque 4.4 N ⋅ m ●Connection of secondary on D-Sub-9, UNC 4-40 

Manual tightening until full stop 

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LEM reserves the right to carry out modifications on its transducers, in order to improve them. 

13May2022/Version 1