IT 205-S ULTRASTAB

_I_ **= 200 A PN** 

## **Current Transducer IT 205-S ULTRASTAB** 

**For ultra-high precision measurement of current: DC, AC, pulsed..., with galvanic separation between primary and secondary.** 

## **Features** 

- ●Wide operating temperature range of −40 °C to 85 °C 

- ●Closed loop (compensated) current transducer using an 

   - extremely accurate zero flux detector 

- ●Electrostatic shield between primary and secondary circuit 

- ●9-pin D-Sub male secondary connector 

- ●Optically insulated output (photocoupler type) indicates transducer state 

- ●LED indicator confirms normal operation. 

## **Advantages** 

- ●Very high accuracy 

- ●Excellent linearity 

- ●Extremely low temperature drift 

- ●Wide frequency bandwidth 

- ●High immunity to external fields 

- ●No insertion losses 

- ●Low noise on output signal 

## **Applications** 

- ●Feed back element in high performance gradient amplifiers for MRI 

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

- ●Calibration unit 

- ●Energy measurement 

- ●Medical equipment. 

## **Standards** 

- ●EN 61000-6-2: 2005 

- ●EN 61000-6-3: 2007 

- ●EN 61010-1: 2010. 

## **Application Domains** 

   - ●Industrial 

   - ●Laboratory 

   - ●Medical. 

- ●Low noise feedback to primary conductor. 

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N° 88.K7.44.000.0 

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice 

16April2015/version 1 

www.lem.com 

**IT 205-S ULTRASTAB** 

## **Insulation coordination** 

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


|**Parameter**|**Symbol**|**Unit**|**Value**|**Comment**|
|---|---|---|---|---|
||||||
|Rated insulation rms voltage, basic insulation|_U_b|V|2000|IEC 61010-1 conditions<br>- over voltage cat III<br>- pollution degree 2|
|Rated insulation rms voltage, reinforced insulation|_U_b|V|600|IEC 61010-1 conditions<br>- over voltage cat III<br>- pollution degree 2|
|Rated insulation rms voltage, basic insulation|_U_b|V|1000|EN 50178 conditions<br>- over voltage cat III<br>- pollution degree 2|
|Rated insulation rms voltage, reinforced insulation|_U_b|V|600|EN 50178 conditions<br>- over voltage cat III<br>- pollution degree 2|
|Rms voltage for AC insulation test, 50/60 Hz, 1 min|_U_d|kV|5.4|Between primary and<br>secondary + shield|
|Insulation voltage between secondary and shield||V DC|200|Between secondary and<br>shield|
|Insulation voltage between secondary status output||V DC|300|Between secondary and<br>status output|
|Impulse withstand voltage 1.2/50 µs|_Û_W|kV|9.9||
|Clearance (pri. - sec.)|_d_CI|mm|11|Shortest distance through<br>air|
|Creepage distance (pri. - sec.)|_d_Cp|mm|11|Shortest path along device<br>body|
|Comparative tracking index|_CTI_||600||



If insulated cable is used for the primary circuit, the voltage category could be improved with the following table (for single insulation) (IEC 61010-1 standard): 

Cable insulated (primary) Category HAR03 2150 V CAT III HAR05 2250 V CAT III HAR07 2350 V CAT III 

## **Environmental and mechanical characteristics** 

|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
|Ambient operating temperature|_T_A|°C|−40||85||
|Ambient storage temperature|_T_S|°C|−40||85||
|Relative humidity|_RH_|%|20||80|Non-condensing|
|Dimensions||||||See drawing page 7|
|Mass|_m_|kg||0.35|||



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**IT 205-S ULTRASTAB** 

## **Electrical data** 

At _T_ A= 25 °C, ± _U_ C  = ±15 V, unless otherwise noted. 

Lines with a * in the comment column apply over the −40 … 85 °C ambient temperature range. 

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


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|**Comment**|
|---|---|---|---|---|---|---|---|
|||||||||
|Primary continuous direct current|_I_PN DC|A|−200||200|*||
|Primary nominal rms current|_I_PN|A|||200|*||
|Primary current, measuring range|_I_PM|A|−283||283|*|Peak limit|
|Measuring resistance over supply voltage<br>range|_R_M|Ω|0||20||See graph page 5|
|Secondary current|_I_S|mA|−283||283|*|Peak limit|
|Secondary nominal rms current|_I_SN|mA|||200|*||
|Conversion ratio|_K_N|||1:1000||*||
|Resistance of secondary winding|_R_S|Ω||20||||
|Overload capability1)|_Î_P|A|−1000||1000||@ pulse of 100 ms|
|Supply voltage DC|_U_C|V|±14.25|±15|±15.75|*||
|Current consumption|_I_C|mA||65|71||Add_I_Sfor<br>total current<br>consumption|
|||||70|78|*||
|Output rms noise current 0 … 10 Hz2)|_I_no|ppm|||0.1|||
|Output rms noise current 0 … 100 Hz2)|||||0.5|||
|Output rms noise current 0 … 1 kHz2)|||||1.5|||
|Output rms noise current 0 … 10 kHz2)|||||6|||
|Output rms noise current 0 … 50 kHz2)|||||15|||
|Re-injected rms noise on primary bus bar||µV|||5||0 … 50 kHz|
|Electrical offset current + self magnetization<br>+ effect of earth magnetic feld2)|_I_OE|ppm||±45|±100|||
|||||±100|±190|*||
|Offset stability2)||ppm/month|||1|||
|Linearity error2)|_ε_L|ppm||±1|±3||@ ±_I_PN DCrange|
|||||±4|±11|*||
|Step response time to 90 % of_I_PN DC|_t_r|µs|||1||d_i_/d_t_of 100 A/µs|
|d_i_/d_t_accurately followed|d_i_/d_t_|A/µs||100||||
|Frequency bandwidth (±1 dB)|_BW_|kHz||400|||Small-signal<br>bandwidth,<br>0.5 % of_I_PN DC|
|Frequency bandwidth (±3 dB)|_BW_|kHz||1000|||Small-signal<br>bandwidth,<br>0.5 % of_I_PN DC|



Notes: 1) Single pulse only, not AC. The transducer may require a few seconds to return to normal operation when autoreset system is running 

> 2) All ppm figures refer to full-scale which corresponds to a secondary nominal rms current ( _I_ SN) of 200 mA. 

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**IT 205-S ULTRASTAB** 

## **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 110 % of _I_ PM 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 between −283 mA and 283 mA. 

- ●The signal _V_ out (operation status between pin 3 and 8 of the D-sub connector) switches to V+ or GND depending on how it is wired. In other words, the output transistor is switched off (i.e., no current from collector to emitter). 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_ PM  and + _I_ PM. Then the signal _V_ out switches to V+ or GND and the green LED indicator (normal operation status) is again lit. 

## **TO ENSURE A SAFE RECOVERY FROM SATURATION, THE MAXIMUM BURDEN RESISTOR ALLOWED IS 15 Ω.** 

## **Status/Interlock port wiring** 

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**----- Start of picture text -----**<br>
Diagram A: Active Low Output  V+ : 4 ... +45V<br>DC<br>Power<br>Supply<br>R<br>I CE max : 30 mA D-Sub9<br>I CE min  :   2 mA Pin<br>8 V OUT<br>The photocoupler is driven as follows: Collector<br>ON   : Transducer is OK (Normal Operation)<br>D-Sub9<br>OFF : Transducer is not OK  Pin V+ (V) − 0.4 V<br>Emitter 3 R min (KΩ) =  30 mA<br>V+ (V) −0.4 V<br>R max (KΩ) =  2 mA<br>TRANSDUCER USER SIDE<br>Diagram B: Active High Output  V+ : 4 ... +45V<br>DC<br>D-Sub9 Power<br>Pin Supply<br>8<br>The photocoupler is driven as follows: Collector<br>ON   : Transducer is OK (Normal Operation)<br>D-Sub9<br>OFF : Transducer is not OK  Pin<br>Emitter<br>3 V OUT<br>I CE max : 30 mA<br>I CE min  :   2 mA V+ (V) −0.4 V<br>R R min (KΩ) =  30 mA<br>V+ (V) −0.4 V<br>R max (KΩ) =  2 mA<br>TRANSDUCER USER SIDE<br>**----- End of picture text -----**<br>


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**IT 205-S ULTRASTAB** 

The following table shows how the output signal _V_ out acts depending on how it is wired: 

|**Case**|||_V_**out**||**Description**|
|---|---|---|---|---|---|
|||< 0.2 V|< 0.2 V|< 0.2 V|The transducer is OK (Normal operation)|
|Diagram A|Diagram A|||||
||||V_+_||The transducer is not OK (Overload mode or supply fault)|
|||< 0.2 V|< 0.2 V|< 0.2 V|The transducer is not OK (Overload mode or supply fault)|
|Diagram B|Diagram B|||||
||||V_+_||The transducer is OK (Normal operation)|



## Some recommended standard values of _R_ : 

|**Power supply voltage V+**|_R_**min (k**Ω**)**|_R_**max (k**Ω**)**|_R_**standard values ±5 %**|
|---|---|---|---|
|5 V|0.153|2.3|180 Ω, 1 kΩ or 2.2 kΩ|
|12 V|0.386|5.8|470 Ω, 2.2 kΩ or 4.7 kΩ|
|24 V|0.786|11.8|1 kΩ, 2.2 kΩ or 10 kΩ|



## **Electrical data - status port** 

|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
|Collector-Emitter voltage, off-state|_V_CE off|V|4||45||
|Collector-Emitter current, on-state|_I_CE|mA|2||30||
|Reverse Collector-Emitter voltage, off-state|_V_CER off|V|||5||
|Collector-Emitter voltage, on-state|_V_CE on|V|||0.2||



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

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Page 5/7 www.lem.com 

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice 

16April2015/version 1 

**IT 205-S ULTRASTAB** 

## **Safety** 

This transducer must be used in limited-energy secondary circuits according to IEC 61010-1. 

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. 

Caution, risk of electrical shock 

When operating the transducer, certain parts of the module can carry hazardous voltage (eg. primary connection, 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. 

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**IT 205-S ULTRASTAB** 

## **Dimensions** (in mm) 

**==> picture [511 x 334] intentionally omitted <==**

## **Connection** 

- ●Normal operation status (Pins 3 and 8) Normal operation means: - ±15 V (± _U_ C) pres ~~en~~ t - zero detector is working ~~- primary current  ≤ 110 %~~ of _I_ ~~PM~~ 

   - green LED indicator is lit ~~.~~ 

## **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. Pin 4 should be connected to cable and connector shield to maintain lowest output noise. 

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

## **Mechan** ~~**i**~~ **cal charac** ~~**t**~~ **eristics** 

- ~~Ge~~ n ~~e~~ ral tolerance ±0.3 mm 

- ●T ~~ra~~ nsd ~~uc~~ er fas ~~te~~ ni ~~n~~ g 

- - Straight mounting 

- 2 holes ⌀ 5.5 mm 

- 2 × M5 steel screws 

Recommended fastening torque 3.7 N·m 

   - Flat mounting 4 holes ⌀ 4.5 mm ~~4 × M4 steel screws~~ 

   - Recommended fastening torque 2.8 N·m 

- ~~4 × M4 steel screws~~ 

- Recommended fastening torque 2.8 N·m 

- ●Connection of secondary on D-SUB-9, 

      - connector UNC 4-40 

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

      - ⌀ ≤ 26 mm 

- ●Primary through hole 

- ●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: **Products/Product Documentation.** 

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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice 

16April2015/version 1