EN44 Field Friendly Zone 1 Barrier-less Encoder



Dynapar announces the introduction of the EN44 oilfield encoder suitable for use in Zone 1 hazardous locations. What makes the new incremental encoder unique is the ability to operate in hazardous areas without the need for intrinsic safety (I.S.) barriers. Removal of the I.S. barrier reduces system cost, simplifies wiring, and provides for a more permanent installation. Also, faster data acquisition rates are possible since losses through the I.S. barrier are eliminated. The new encoder features Ex ia mb e IIC T4 ATEX certification, along with an industry-leading -50 to +100C operating temperature range.

Field-Friendly Concept

The new harsh duty incremental encoder is designed with "Field-Friendly" characteristics in mind—compact, easy to mount, easy to wire, and reliable in harsh conditions. These traits are routinely designed into NorthStar brand heavy-duty encoders, but become much more challenging when Zone 1 certification is required. The new encoder incorporates an increased safety interface to eliminate the need for external I.S. barriers, and use encapsulated electronics to prevent unwanted component contact with flammable gases. As a result, the encoder circuit isn't limited in electrical energy the way standard I.S. encoders are, therefore allowing for longer cable runs and improved signal-to-noise ratio. The EN44 series also features a field wire-able terminal block inside a conduit box with 3/4" NPT entry. Optional ATEX rated glands for armored or non-armored cable use are also available.

Rugged Design for Oilfield Motor Use

Starting with Dynapar's proven phased-array ASIC sensing technology, the encoders feature a rugged design with wide sensing gap, mechanically captured bearings, and non-glass code discs. The result is a robust incremental encoder that can handle excessive shock and vibration that would destroy more fragile industrial encoders. In addition, the housing receives hard anodizing to resist corrosion in less-than-perfect operating conditions. The EN44 model mounts directly to an IEC motor flange and incorporates an innovative isolated flex coupling. This special coupling not only isolates the encoder electronically, it compensates for motor shaft run-out and end play.

Availability

The EN44 incremental encoders is built to order and available for the general market. The encoder will be marketed under Dynapar's heavy-duty NorthStar brand name and will be manufactured in the company's Gurnee, IL manufacturing facility. For custom OEM applications and volume pricing, contact a Dynapar representative at 800-873-8731 or visit the web at www.dynapar.com/drillgear for technical information.