Eltra EX 80 ATEX Incremental Encoder

Name: Eltra EX 80 ATEX Incremental Encoder | Seven Star LLC
Brand: Eltra
SKU: EX 80

A flameproof incremental encoder with 10 mm solid shaft for gas and dust atmospheres

The EX 80 is Eltra’s explosion proof incremental encoder for plants where rotary feedback has to be installed inside a hazardous area. The datasheet describes a three channel (A / B / Z) device with resolutions from 100 to 10000 pulses per revolution, a supply of up to 30 V DC, an output frequency of up to 500 kHz and a 10 mm solid shaft. It is offered as the EX 80A with a synchronous flange and the EX 80D with a centering square flange, both of 40 mm diameter.

The housing is the point of the product. Eltra states that an EC-type examination certificate, CESI 04 ATEX 082, assures compliance with the essential health and safety requirements of EN IEC 60079-0:2018, EN 60079-1:2014 and EN 60079-31:2014. The printed marking is II 2GD, Ex db IIC T6 Gb and Ex tb IIIC T85°C Db, covering gas and combustible dust. In a GCC refinery, gas plant or tank-farm pump house, this is the family of device that replaces a standard encoder when a zone drawing forbids one.

Features printed in the datasheet

Explosion proof encoder designed for hazardous and explosive environments
Three channel output (A / B / Z) up to 10000 ppr
Supply up to +30 V DC with NPN, push-pull, line driver and RS-422 interfaces
Output frequency up to 500 kHz
10 mm solid shaft, stainless steel
Synchronous or centering square flange mounting
Radial cable output, standard length 1.5 m

Technical specifications

Parameter	Specification
Model variants	80A synchronous flange 40 mm; 80D centering square flange 40 mm
Resolution	100 to 10000 ppr (22 listed values)
Supply voltage	5 version: 4.5 to 5.5 V DC; 5/28 version: 4.5 to 30 V DC with reverse polarity protection
Current consumption	80 mA max without load
Max load current	C / P 50 mA per channel; L / RS 20 mA per channel
Output circuits	NPN open collector (pull-up max +30 V DC); push-pull HTL; line driver; RS-422 line driver
Max output frequency	250 kHz up to 6000 ppr; 500 kHz from 7200 ppr
Counting direction	A leads B clockwise, shaft view
Index signal	180°e, gated A
Shaft	10 mm diameter, stainless steel
Enclosure rating	IP 65 (IEC 60529)
Max rotation speed	3000 rpm
Max shaft load	200 N axial and radial, static
Shock / vibration	50 G, 11 ms (IEC 60068-2-27) / 10 G, 10 to 2000 Hz (IEC 60068-2-6)
Moment of inertia	1.5 x 10-6 kgm2
Starting torque	Below 0.06 Nm at +20°C
Bearings	2 ball bearings, life 109 revolutions
Materials	Housing and bearing stage anodized aluminum; shaft stainless steel
Operating temperature	-20 to +50°C, measured on the flange; condensation not allowed
Storage temperature	-20 to +70°C
Weight	1200 g
MTTFd / mission time	263 years / 20 years per EN ISO 13849-1; DC 0 %; not a safety component
Approvals printed	CESI 04 ATEX 082; UL / CSA file E212495; EMC 2014/30/EU; RoHS 2011/65/EU

How to read the EX 80 ordering code

The datasheet example is EX 80A 500 S 5/28 P 10 X 3 PR . XXX. Each position selects one feature.

Code position	Options
Series / model	EX, then 80A (synchronous flange) or 80D (centering square flange)
Resolution	100, 200, 360, 400, 500, 1000, 1024, 1440, 2000, 2048, 2500, 3000, 3600, 4000, 4096, 5000, 6000, 7200, 8000, 8192, 9000 or 10000 ppr
Zero pulse	S without, Z with
Power supply	5 for 5 V DC with L interface; 5/28 for 5 to 28 V DC
Electrical interface	C NPN open collector; P push-pull; L line driver; RS 5/28 V DC with RS-422 output
Shaft / enclosure / speed	10 mm / X = IP 65 / 3 = 3000 rpm
Output type	PR radial cable, 1.5 m standard; 2, 3, 5 or 10 m added after PR (for example PR5)
Variant	XXX custom version

Installation and operating notes

Eltra recommends an H7 mating shaft tolerance. Fixing clamps for the synchronous flange are not included and are listed under Accessories. Observe the 200 N static shaft load limit.

Cable colours differ by output circuit. For the C / P versions the datasheet shows brown +V DC, grey 0 V, green A+, yellow B+ and white Z+. For the L / RS versions it adds red A-, pink B- and white Z-, and Z+ becomes blue. Check the connection table in the datasheet against your cable before wiring.

The hazardous-area classification belongs to the certified housing, so keep the cable entry, cover and flange as supplied and check the nameplate marking against the zone and temperature class on your area drawing.

Where the EX 80 fits in GCC hazardous areas

Typical positions are speed and position feedback on motors, pumps, compressors, mixers and conveyors located in classified areas of oil and gas, petrochemical, fertilizer and grain-handling sites. The Ex tb dust marking also covers the mill-and-silo type of location, where combustible dust is the hazard.

The operating range is -20 to +50°C at the flange, so check summer ambient temperature and heat from the driven machine before specifying it (general remark).

Information to send with an RFQ for the Eltra EX 80

Send the data below so the right EX 80 variant can be quoted.

Flange: synchronous 80A or centering square 80D
Resolution in ppr, with or without zero pulse
Supply voltage and output circuit (NPN, push-pull, line driver, RS-422)
Cable length and the zone, gas group and temperature class of the installation

Maintenance note

Check the cable glands, flameproof joints and cable during routine inspections, as required by the certificate and site rules.

Frequently asked questions

Is the EX 80 an ATEX-certified encoder?

The datasheet states EC-type examination certificate CESI 04 ATEX 082 and the marking II 2GD, Ex db IIC T6 Gb and Ex tb IIIC T85°C Db.

What resolutions are available?

From 100 to 10000 ppr, in 22 listed values from 100 up to 10000. Other counts must be requested from the manufacturer.

What is the enclosure rating and speed limit?

IP 65 and a maximum of 3000 rpm.

What is the operating temperature?

-20 to +50°C, measured at the flange, with no condensation permitted.

What flange and shaft does it have?

A 10 mm stainless steel solid shaft, with either a synchronous flange (80A) or a centering square flange (80D), both 40 mm.

Encoders for motors, lifts and machinery

Eltra describes application areas such as industrial automation, motor feedback, lift systems, packaging, light material processing, heavy duty industry, off-highway vehicles and potentially explosive atmospheres. Hollow shaft and solid shaft designs, bore sizes from a few millimetres to 40 mm, resolutions up to 24000 ppr and enclosure ratings up to IP 67 are printed in the Eltra datasheets.

Frequently Asked Questions