ELTRA industrial rotary encoders, absolute position sensors, and linear transducers

Equipment identification and ELTRA s.r.l. part code nomenclature

Italian manufacturer Eltra s.r.l.

(Via Giambattista Vico, 4, 36040 Sarego, Vicenza, Italy; founded in 1985) utilizes a systematic alphanumeric ordering code that defines the encoder measurement principle, body diameter, flange geometry, shaft dimensions, resolution in pulses per revolution (ppr) or digital bits, output stage

electronics, supply voltage, and ingress protection rating.

To ensure exact replacement matching, provide the complete code printed on the sensor nameplate (e.g., ER38G1000S5/30P8XXPR0.3 M12, EL58C1024Z5/28P10X6PR, EA58C4096/4096G8/28PPX10X3P3R, or EPLA0500S02M).

The leading prefix identifies the product family: EL and ER designate optical incremental encoders, EMI and EMA denote magnetic incremental sensors, EA and EAM represent single-turn and multi-turn absolute encoders, EX designates explosion-proof ATEX models, EPL and EC indicate linear

potentiometers, and FE represents draw-wire mechanisms.

When retrofitting legacy or discontinued models (such as older EAM 50 or EL 63 series with legacy flanges), our engineers provide cross-reference selection to current production lines, ensuring exact mechanical mounting compatibility and identical electrical signal protocols.

EL and ER optical incremental encoders with solid shaft (up to 10,000 ppr)

Standard general-purpose solid shaft incremental encoders (EL 40, EL 58, ER 58, EL 63, ER 63) are engineered for high-precision angular position and velocity feedback in AC servomotors, CNC machine spindles, automated packaging machinery, and printing presses.

The optical scanning engine incorporates a photo-etched grating disk and an integrated optoelectronic receiver with differential push-pull photodiodes, delivering resolutions from 1 to 10,000 pulses per revolution and frequency response up to 500 kHz with minimal phase jitter.

The mechanical construction features heavy-duty precision ball bearings engineered for axial loads up to 50 N and radial loads up to 100 N, reinforced with IP65 or IP67 shaft oil seals. Standard 58 mm diameter synchro and clamping flanges are available with shaft diameters of 6, 8, 9, 10, or 12 mm.

EH 30 and EH 80 hollow shaft incremental encoders for servomotor mounting

Direct coupling to motor drive shafts without intermediate flexible couplings is achieved using hollow blind or through-bore shaft encoders: compact EH 30 models (30 mm housing diameter, bore up to 6 mm) and heavy-duty EH 80 / EL 80 models (80 mm housing diameter, through-bore up to 30 mm).

Mounting onto the motor end-bell utilizes a thin stainless-steel flexible stator coupling plate (torque arm / anti-rotation tether) that absorbs motor shaft runout and thermal expansion, preventing axial stress from transferring onto the encoder bearings.

For brushless synchronous servomotors, Eltra provides specialized variants equipped with integrated Hall-effect commutation tracks (U, V, W signals), providing initial rotor position angles directly to the servo drive amplifier.

EMI and EMA heavy-duty magnetic encoders in harsh IP67 environments

Where optical encoders face the risk of glass disk shattering from severe shock loads or contamination during seal wear, Eltra magnetic incremental encoders (EMI 22, EMI 30, EMI 40, EMI 55, EMA 22, EMA 50) provide reliable non-contact operation.

The sensing mechanism is built around an advanced anisotropic magnetoresistive (AMR/Hall) sensor that reads magnetic field fluctuations from an integrated multipole permanent magnet.

Eliminating fragile optical glass elements delivers exceptional mechanical shock resistance up to 100 G (11 ms) and vibration tolerance up to 20 G across 10 to 2000 Hz.

The magnetic encoder housings are fully potted with resin to achieve IP67 (optional IP69K) ingress protection, ensuring reliable service in construction machinery, forestry harvesters, concrete batching plants, and food processing lines subjected to high-pressure washdown.

EA and EAM absolute encoders: Profinet, EtherCAT, CANopen, and SSI interfaces

Eltra absolute encoders deliver definitive angular position feedback immediately upon system power-up without requiring homing reference runs or zero-point calibration, providing critical positioning safety for industrial robotics, rotary indexing tables, overhead cranes, and automated warehouses.

The EA 58 / EA 63 (optical) and EAM 58 / EAM 63 (magnetic) series are available in single-turn configurations (resolutions up to 16 bits / 65,536 steps per turn) and multi-turn configurations (providing an additional 14 bits / 16,384 complete revolutions via internal mechanical gear trains,

eliminating backup battery dependency).

The encoders support leading industrial fieldbus protocols: Profinet IO (Conformance Class B/C, Encoder Profile v4.1/4.2), EtherCAT (CoE), CANopen (DS406 profile), Profibus-DP (DP-V0/V1/V2), synchronous serial interface (SSI), and analog 4–20 mA / 0–10 V outputs.

EX 80 and EAMX 80 explosion-proof executions under ATEX and IECEx directives

For process automation across petrochemical plants, natural gas compression stations, paint spray booths, flour mills, and underground mines, Eltra supplies certified flameproof explosion-proof encoders (EX 80, EAMX 80, ELX 80, ERX 80).

Explosion containment is provided by a heavy-duty Ex d flameproof enclosure cast from corrosion-resistant copper-free aluminum alloy, capable of containing internal gas explosions without igniting explosive atmospheres in the surrounding environment.

The encoders hold European ATEX 2014/34/EU and international IECEx certifications marked II 2G Ex d IIC T6/T5 Gb for explosive gas atmospheres (Zones 1 and 2) and II 2D Ex tb IIIC T85°C/T100°C Db for combustible dust atmospheres (Zones 21 and 22) with IP66 sealing.

EPL/EC linear potentiometers, EMS magnetostrictive sensors, and FE draw-wire units

For linear displacement feedback, Eltra offers a comprehensive portfolio: potentiometric linear transducers (EPL: EPLA, EPLB; EC34) with strokes from 50 to 1500 mm and conductive plastic resistive tracks rated for over 100 million operating cycles.

Contactless magnetostrictive position transducers (EMS series: profile-housed EMSA and stainless-steel rod EMSPB) withstand internal hydraulic operating pressures up to 350 bar, designed for direct integration into hydraulic cylinders on hydraulic presses, plastic injection molding machines, and dam

sluices.

Draw-wire transducers (FE 1500, FE 4000, FE 10000) and FEP mechanical adapter kits convert long linear travels (up to 10,000 mm) on crane telescopic booms, scissor lifts, and warehouse stacker cranes into rotary encoder motion with repeatability within ±0.15 mm.

G20/G25 flexible coupling installation, shaft misalignment compensation, and EMC

Direct rigid coupling between encoder shafts and drive shafts must be avoided: even small radial or angular offsets (exceeding 0.05 mm) create severe cyclic bearing fatigue, causing premature bearing failure, mechanical runout, and disk damage within months of operation.

Shaft connection requires genuine Eltra flexible couplings: stainless-steel bellows couplings (G20 series) and helical beam aluminum couplings (G25, G30 series), absorbing axial displacements up to ±0.3 mm, radial offsets up to ±0.2 mm, and angular misalignments up to 2° with zero backlash.

To prevent electrical noise interference from nearby variable frequency drives (VFDs), signal cables must be routed using twisted shielded pairs with the cable shield grounded via the metal M12 / M23 connector shell directly to the electrical cabinet ground bus.

Global B2B supply, OEM compatibility verification, and express logistics

We organize direct regular supplies of original Eltra s.r.l. encoders, linear sensors, and installation accessories for industrial end-users, machine builders, and system integrators worldwide.

Our engineering team reviews technical specifications, decodes complete Eltra ordering designations, verifies mechanical shaft and flange dimensions, and configures mating cable connectors and matching flexible shaft couplings.

We provide complete export documentation, customs clearance, and global express air freight delivery directly to your facility with full tracking.