Telephone: +44 (0)1794 514445
Email: sales@theencodercompany.co.uk

 

ATEX Encoders

The ATEX directive, known as Directive 94/9/EC supercedes all previous regulations in Europe applying to the use of components and systems where potentially explosive conditions may occur. This relates to the dangers of both dust (grain, tobacco etc) and gas, from causes of ignition such as high temperature, spark and arc. European standards EN 50014 and EN 50018 now apply. Equipment which is to be used in a potentially explosive environment (or which may be associated with the function of the same) has to be certified by an independent body, and labelled for the "level" of safe operation (gas, dust etc) using a code. For more details visit this link: http://europa.eu.int/comm/enterprise/atex/

Rotary Encoders

Because these devices operate electrically they are not intrinsically safe by design and require individual product certification.

Hengstler Rotary Encoders with ATEX Approval

We have one absolute encoder and a selection incremental encoders with ATEX certification. The AX and RX Hengstler encoders are high resolution, high protection class. The other encoders are all incremental suitable for higher operating temperatures specifically designed for rugged duty. You can select from the summary chart shown here.

Body Size *	Shaft	Resolution ppr	NEMA Options	Stainless Options	Max Temp	Series
47.5mm	Solid 10mm	1-3600	✔	✔	+80°C	HD20
67.3mm	Solid 10mm	1-5000	✔	✔	+80°C	HD25
70mm	Solid 10mm	10 Bit ST	-	-	+60°C	AX70
70mm	Solid 10mm	Up to 25 Bit MT+ST	-	✔	+60°C	AX71
70mm	Solid 10mm	1-10,000	-	-	+60°C	RX70
70mm	Solid 10mm	1-10,000	-	✔	+60°C	RX71
90.2mm	Hollow 10/12.7mm	1-3600	✔	✔	+80°C	HSD25
95.2mm	Hollow 1"	15-5000	✔	✔	+80°C	HSD37
3.75"	Solid 1" thread	15-5000	✔	✔	+80°C	DWD38

* Body size : Just a guide, please see data sheets.

Please note that the HD, HSD &d DWD encoders have a normal maximum ambient temperature rating of 100°C but the versions with ATEX certification are limited to +80°C. These encoders are branded Hengstler and NorthStar and are often used in harsh environments such as oil and gas, chemical, paper and steel.

ATEX Certification

The Hengstler RX70/71 and AX70/71 ATEX Certification is as shown here.

A typical certification code will define a device group, a category, a definition of suitability for gases or dusts, a geographical specification code, an explosion proof category, a gas group where applicable, a temperature code and possibly an IP rating.

It is the ultimate responsibility of all systems builders to ensure that the total package / assembly / system complies with Directive 94/9/C as may be applicable. If in doubt please contact us directly with details of your application and the products you are considering using.

Hengstler AX70/71 Series Solid Shaft Absolute Encoders
70mm diameter, 10mm solid shaft
26 Bit (14 Bit ST, 12 Bit MT) Resolution
10-30VDC
Max Speed 10,000 rpm (+60°C Max)
Max Speed 6,000 rpm (+40°C Max)
Aluminium or Stainless Steel Versions
-40°C - +60°C T4
Up to IP67. ATEX II
SSi, PROFIBUS, CAN
168Kb PDF

Hengstler RX70/71 Series Solid Shaft Incremental Encoders
70mm diameter, 10mm solid shaft
Up to 10,000 ppr
5VDC or 10-30VDC
Max Speed 10,000 rpm (+60°C Max)
Max Speed 6,000 rpm (+40°C Max)
Aluminium or Stainless Steel Versions
-25°C - +60°C T4
Up to IP67. ATEX II
115Kb PDF

Hengstler HD20 Series Solid Shaft Incremental Encoders
Approx 47.5mm x 52.3mm 10mm shaft
1-3,600 ppr (specify on order)
5-26VDC or ATEX 5VDC or ATEX 7-26VDC
Max Speed 6,000 rpm.
Nickel or Stainless Steel versions.
-40°C to +100°C (+80°C ATEX)
IP66/67, NEMA 4X, NEMA 6P, ATEX II
164Kb PDF

Hengstler HD25 Series Solid Shaft Incremental Encoders
Housing 67.3mm x 67.3mm 10mm shaft
1-5,000 ppr (specify on order)
5-26VDC or ATEX 5VDC or ATEX 7-26VDC
Max Speed 6,000 rpm.
Nickel or Stainless Steel versions.
-40°C to +100°C (+80°C ATEX)
IP66/67, NEMA 4X, NEMA 6P, ATEX II
160Kb PDF

Hengstler HSD25 Series Solid Shaft Incremental Encoders
Housing 90.2mm x 90.2mm 10mm/12.7mm shaft
1-3,600 ppr (specify on order)
5-26VDC or ATEX 5VDC or ATEX 7-26VDC
Max Speed 3,600 rpm (peak 6,000).
Nickel or Stainless Steel versions.
-40°C to +100°C (+80°C ATEX)
IP66/67, NEMA 4X, NEMA 6P, ATEX II
180Kb PDF

Hengstler HSD37 Series Hollow Shaft Incremental Encoders (up to 1")
Housing dia 92.5mm
15-5,000 ppr (specify on order)
5-26VDC
Max Speed 3,600 rpm (peak 6,000)
Anodized Aluminium or Stainless
+40°C to +100°C (+80°C ATEX)
IP66/67, NEMA 6, ATEX II
176Kb PDF

Hengstler DWD38 Series Solid Shaft (threaded) Incremental Encoders
Housing dia 3.75 inches
15-5,000 ppr (specify on order)
5-26VDC
Max Speed 3,600 rpm (peak 6,000)
-40°C to +100°C (+80°C ATEX)
Nickel or Stainless Steel Versions
IP66/67, NEMA 7, ATEX II
160Kb PDF