Dynapar - Rotary Feedback products. Innovation, Customization, Delivery.

Innovation, Customization, Delivery

Dynapar encompasses the broadest line of trusted brands in motion feedback control, including Dynapar encoders and Hengstler brand incremental encoders and absolute rotary encoders, Northstar heavy-duty magneto-resistive and Heavy-Duty optical encoders and high-performance Harowe brand resolvers. Only Dynapar feedback solutions offer these world-class rotary feedback brands from one Global Supplier with 3 day delivery on most models for customer peace of mind.

Joliet Technologies is the preferred Dynapar Integrator for the Chicagoland area.

Series DWD38 Heavy Duty Rotary EncodersSeries DWD38 Heavy Duty Rotary Encoders

Quick Specs…

  • Single or dual output – NAMUR available
  • Well-suited for DrawWorks / oil field application
  • ATEX certification available for intrinsically safe application
  • High resolution unbreakable disk
  • Industrial Duty Connector
  • NEMA 4X / IP67 Rated
  • Nickel or stainless steel housing available
  • Two Year Warranty

Overview / Design Principle:

Northstar’s DWD38 Harsh Duty Optical Encoder is an Industrial Hollowshaft that operates reliably from -40 to 100°C. The hard anodized finish encoder exceeds IP66/IP67 and NEMA 6 enclosure requirements.

Extremely robust, the DWD38 encoder is also available in stainless steel to meet NEMA 4X and 6P requirements. A unique labyrinth double-sealed housing allows operation when regulatory washdown and high pressure steam or caustic chemicals are required.

The DWD38 is a preferred choice as a DrawWorks encoder by the Oil Field industry and is also commonly used in high shoch and vibration environments such as food processing, material handing and packging equipment applications.

It is also available in an intrinsically-safe version certified to ATEX EEX IA IIB T4 used with the appropriate IS barrier.

Features and Benefits:

Mechanical and Environmental

  • Unbreakable code disks for 1 to 3600 PPR
  • Hubshaft mounting
  • Heavy-duty shaft seals
  • Sealed connector – no soldering


  • Cast housing maximizes noise immunity and durability
  • NAMUR outputs and ATEX certification available

Applications/ Industries:

The DWD38 harsh duty optical encoder is ideal for DrawWorks application and corrosive environments that demand heavy washdown protection. This compact, special duty encoder is designed to excede IP66/^& and NEMA 6 enclosure requirements with a PPR range though 5000. ATEX certification is also available for intrinsically safe applications.

  • DrawWorks and other Oilfield
  • Converting Machinery
  • Material Handling
  • Packaging Equipment
  • Pickling Equipment
  • Processing Equipment


Standard Operating Characteristics

Code: Optical Incremental
Pulses per Revolution: 1-5000
Phasing Sense: A leads B for Clockwise rotation (CCW) viewing shaft rotation viewing the shaft clamp end of the encoder
Quadrature Phasing: 90° ± 15°
Symmetry: 180° ± 18°
Index: 180° ± 18°


Input Voltage Requirement: 5-26 Volts VDC; 5DVC; 7-26VDC (ATEX)
Current Requirement: 50 mA typical plus line driver load
Output Signals: With Elec Option 0, 1, 2, 4, A & B: 5-26 V Line Driver, 40mA
With Elec Option 3: 5 V Line Driver, 40mA
With Elec Option 5: 5 V Line Driver, 100mA
With Elec Option 6: 5-15 V Line Driver, 100mA
Frequency Response: 0 – 125kHz Data & Index
Electrical Immunity: 1kV ESD, Reverse Polarity, Short Circuit
Connector: 6, 7 or 10 pin style MS3 connectors available; 18″ cable exit with seal


Shaft Speed: 3,600 RPM; Max up to 6000 RPM
Mounting Configuration: Flexible mount with anti-rotation arm
Housing Material: Hard anodized aluminum, stainless steel or nickel plated versions available
Available Shaft Sizes: 5/8″ – 18 UNF x 1-1/4″UNS or 1″-14 UNS nonconvertible bores available.
See ordering table for sizes.
Allowable Shaft End-Play: ± 0.050”
Allowable Shaft Runout: 0.025” TIR (Subject to RPM Limitation)


Operating Temperature Range: -40°C to +100°C; -40°C to +80°C (ATEX)
Storage Temperature Range: -40°C to +100°C
Humidity: to 98% RH (non-condensing)
Shock: 50 Gs for 11 ms
Vibration: 20 Gs @ 5-2000 Hz spectrum

Available Specifications:

Related Products & Resources:

For additional information or to receive a full-line catalog, contact your Dynapar representative at 1.800.873.8731 or visit their web site at: www.dynapar.com
Headquarters:1675 Delany Road • Gurnee, IL 60031-1282 • USA
Phone: 1.847.662.2666
Fax: 1.847.662.6633
Email: custserv@dynapar.com or dynapar.techsupport@dynapar.com
© 2009 Dynapar Corp. Printed in U.S.A. • Feedback Quick Reference Guide P/N# N-FLB130 (11/09) 5M

Call Joliet Technologies TODAY 

If you have any questions concerning Dynapar products, feel free to contact us:
Phone (815) 725-9696,
Toll Free (866) 492-9888,
Fax (815) 725-9393 or
E-mail info@joliettech.com

Joliet Technologies custom packages, integrates and engineers AC Variable Frequency Drives (VFD), DC Variable Speed Drives (VSD) and AC Drive Controllers using top of the line manufacturers, like ABB, Emerson-Control Techniques, Siemens and Saftronics (Fincor). Our custom drive packages are built to your specifications for your application. We specialize in large horsepower drive systems (500Hp and above). Call us at (815) 725-9696 or fax us at (815) 725-9393 or e-mail us or fill out an RFQ with your requirements. Serving the greater Chicagoland area and the World.