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Inductive linear displacement transducers IW250

Inductive linear displacement transducers IW250
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Inductive linear displacement transducers IW250 - 1

Inductive linear displacement transducers Model IW250 Measuring strokes: 20 mm, 40 mm, 100 mm, 200 mm ■ Contactless, robust sensor system ■ Infinite resolution, no hysteresis ■ Calibrated output signals: 0...20 mA, 4...20 mA, ± 10 V, 0...10 V ■ Integral electronics for DC in / DC out ■ Accuracy up to 0.1% ■ Gauge type up to 100 mm ■ Protection class up to IP 68 * Increasing means that the output signal increases positively when the plunger is moved in the direction towards the plug. Construction and operating principle The displacement transducer operates according to the principle of the differential choke, i.e. an inductive half bridge. It consists of two coils which are encapsulated in a stainless steel cylinder. A mu-metal plunger core causes opposing changes of inductance when it is displaced through the centre of the coils. These changes are converted by the integral electronic circuit into a signal proportional to the displacement. The circuit contains an oscillator, demodulator, amplifier and in some cases, a current output source. It is short-circuit proof and protected against reverse polarity. The transducers are completely sealed to ensure positive protection against vibration, shock, humidity, oil and corrosive matter. Standard measuring strokes: 20 mm, 40 mm, 100 mm, 200 mm The following variants can be supplied upon request: ■ Extension of above measuring strokes depending on accuracy tolerances as follows (without increase of case length): □ for 0.5% tolerances: standard stroke + 15 mm □ for 0.25% tolerances: standard stroke + 10 mm ■ Calibration of shorter strokes within the above standard ranges (without change of case length),e.g. IW 251/40 becomes IW 251/30, i.e. 0 to 30 mm equals 0 to 20 mA. ■ Measuring strokes up to 270 mm within case of IW 250 /200 (requiring larger linearity tolerances and longer plunger length). Subject to special agreement. Other supply voltages upon request. Note: The type IW 255 replaces the previous type IW 25 and is fully interchangeable with it, both mechanically and electrically. TWK-ELEKTRONIK GmbH BismarckstraBe 108 info@twk.de visit us at | twk.de

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Inductive linear displacement transducers IW250 - 2

SUPREME SENSORING Technical data Technical data ■ Supply voltage range VS : ■ Accuracy : ■ Temperature drift : ■ Stability : ■ Measurement frequency : ■ Operating temperature range : ■ Storage temperature range : ■ Resistance to shock : ■ Resistance to vibration : ■ Protection class : 21.5 to 32 VDC or ± 13 to ± 16 VDC (protected against reverse polarity) ± 0.1%, ± 0.25%, ± 0.5% < 0.01%/°C < 0.1% in 24 hours 100 Hz max. -10°C to +80°C -30°C to +80°C 250g SRS at 20 at 2000 Hz 20g rms (50g peak) at 20 to 2000 Hz IP 66 (with connector) IP 68 (with cable) Current output (IW 251 to IW 254) ■...

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Inductive linear displacement transducers IW250 - 3

(with view on the contacts at the transducer case) 1 = +U 2 = -Ub (0V) -Ia 3 = +IA / UA(output signal) 1 = +U 2 = 0V (common) 3 = -UB 4 = +UA (output signal) Order code format □ External and internal tube: □ Plunger: □ Core: □ Connector case: □ Connector contacts: □ Spring and gauge head: Chrome-nickel steel Chrome-nickel steel Mu-metal Brass, nickel-plated Gold-plated Stainless steel ("T") Calibration Both the sensor system and the plunger core are calibrated as one unit. They carry the same serial number. Lengths and masses (refer to drawings page 4) L1 = Plunger in central position: Io =...

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Inductive linear displacement transducers IW250 - 4

Inductive linear displacement transducers model IW250 Installation drawing Standard version, without rod guide Version with ball joint on plunger (KV), without rod guide pivot angle 13˚ Øø5H7 5 ø18 Ball joint head to DIN 648 Version with ball joint on plunger (KFN) and on end of case (KHN), with rod guide, captivated O 5 H7 Brass guide sleeve L1 +20 ±2 Gauge version (T) with return spring (up to 100 mm stroke), Version (PK) with cable exit with gland Plunger in central position Plunger full out Spring prestress Spring rate

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Inductive linear displacement transducers IW250 - 5

Mating plugs Metal case (to be ordered separately) BI 681 3PS or 4PS (IP40) Metal housing with ground loop (to be ordered separately) STK3GS111 3-pole Cable entry with strain relief For cables with 6-8mm 0 IP67 brass nickel plated (to be ordered separately) 2 hexagon socket screws M4/35 mm are supplied witheach item Date: 26.08.2019 Page 5 of 5 Document no. IW 10225 JE

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