absolute rotary encodersPosital announced heavy-duty absolute rotary encoders that feature shock- and vibration-resistant magnetic measuring elements in rugged 316L stainless steel housings that make them suitable for use in harsh environments such as offshore facilities, seagoing vessels, construction equipment or military vehicles. With effective seals on the shaft entry and cable connection (IP68 and IP69K level protection), these devices are capable of withstanding salt water, acid, dirt, dust, even water jets and aggressive cleaning procedures. Mounted on sturdy ball-bearings, the shaft can withstand mechanical forces of up to 300 N (67 pounds). The company’s magnetic encoders use a highly reliable measurement technology that provides 13-bit resolution (8192 steps per revolution). Multi-turn models are available with virtually unlimited range (limited only by memory size). The internal rotation counter uses a unique self-powered technology that enables these devices to keep track of their absolute position even when movement occurs during control system power outages. This eliminates the need for backup bat-teries and reduces maintenance requirements. Posital encoders are available with a simple serial (SSI) interface or more sophisticated CANopen, DeviceNet and SAE J1939 field bus interfaces. Analog interfaces (4-20mA or 0-10V) are also available.

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