Draw Wire Position Sensors: Precise Linear Measurement Solutions for Industrial Applications

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draw wire position sensor

What is a Drawwire Position sensor?The draw wire position sensor, also known as a string pot, string encoder or cable-extension transducer, is a versatile measurement device which enables a linear position to be determined by means of a flexible cable. The sensor works by converting the rotary motion of the drum (which moves because the cable is being paid out or reeled in) into an electrical signal that represents the linear displacement. They are well-suited for measurement of position over a wide range, usually from a few inches to several meters. The essential elements of the device are a robust measuring cable, a precision-drawn drum and a whole range of outputs – whether analogue, digital or incremental. The durable construction of the sensor permits high reliability in harsh industrial environments, rendering it extremely suitable in manufacturing, automation, and heavy equipment applications.
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While cataloguing several advantages, draw-wire position sensors are the ideal for a wide variety of industrial functions. First, their streamlined design philosophy results in long-term dependabil- ity with little maintenance, translating into reduced downtime and reduced owner’ s costs. Due to the sensors’ ability to measure long distances in a compact form factor, the X45/46 offer substantial space savings over other linear measurement methods. This space saving design is especially useful for limited installation space applications. Its flexible cable design permits to be routed around obstacles and in some cases it can be highly resistant to dynamic application where the measurement path has a curve or two to an extent that is within acceptable limits. Other major benefits are the sensors happy to be exposed to all sorts of environment conditions like dust, dampness, and heaps of vibration. Its easy and fast installation minimizes both the installation time and the expenses, because the sensor can be generally fixed at one end of the measuring range only. -Wire draw sensors also provide an exceptional ratio between performance and cost, particularly over longer distances where other technologies can quickly become cost prohibitive. The sensors offer instantaneous position feedback and are suitable for alert and action applications. Their flexible output options ensure easy integration with a wide range of controls, from simple analog interfacing to sophisticated networking. The inherent accuracy and repeatability of the technology also provides consistency of measurement over the entire stroke, offering better process control and quality. The sensors also have low energy usage and long life, which makes them an eco-friendly option for today’s industrial applications.

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draw wire position sensor

Superior Measurement Range and Accuracy

Superior Measurement Range and Accuracy

Wire draw position sensors are known for their high quality measurement over long operating distances, with good accuracy. These locators can also accurately measure positions from a few inches to several meters, and thus can be used for a wide variety of applications. The sensor’s sophisticated drum construction combined with high-resolution encoding technology results in measurement accuracy of ±0.1% full scale, even at the extended cable lengths. This high resolution is preserved by advanced calibration procedures and integrated compensation methods for environmental influences like temperature changes. The fact that the sensor can make very accurate measurements over several meters is particularly useful in applications where precise position control is needed, for example in automated manufacturing systems, material handling equipment, or monitoring of large machinery.
Robust Environmental Durability

Robust Environmental Durability

The harsh environmental conditions of draw wire position sensor would keep it different from other position measurement technologies by its extremely long term using life. These sensors are constructed from high-strength materials housed in protective enclosures that protect the sensitive internal sensors from exposure to dust, moisture, and other contaminates. The measurement cable is generally made of material with great tensile strength, for example stainless steel or synthetic fibers with special coatings resistant to corrosion and wear. With its sealed construction the sensor can be used in wet, dusty or high pressure wash-down applications. This rugged design is capable of delivering proven performance even in harsh environmental conditions such as variations in temperature, mechanical stresses, and chemical agents, which make these sensors perfect for applications in manufacturing, outdoor equipment, and heavy industry.
Versatile Integration Capabilities

Versatile Integration Capabilities

The wire draw WPS provides flexible integration possibilities, and is easily adaptable to many different industrial applications. 2. They feature multiple output signal types as analog voltage, current output (4-20mA) and a range of digital interfaces like SSI, CANopen or Profibus. This broad spectrum of communication capabilities provides compatibility with most control systems or PLC. Frequently, the sensors have parameters which can be programmed so that the user can tailor measurement range, output scaling, etc., to the particular needs of an application. Higher end models may come with diagnostics that take sensor health and predictive maintenance into account. The small size and numerous mounting configuration options allow installation in tight spaces, while the capability to route the measurement cable around obstacles results in the “installation ease” that rigid measuring systems cannot provide.