CELESCO PT801-0005-611-1111 – Precision Wire-Wound Potentiometric Position Transducer, 0.5″ Stroke

Description

The CELESCO PT801-0005-611-1111 is a high-precision potentiometric linear position transducer engineered for demanding industrial, test, and automation applications requiring reliable analog feedback of mechanical displacement. With a 0.5-inch (12.7 mm) full-scale stroke, this compact sensor converts linear motion into a proportional resistance output—typically 10,000 ohms (10 kΩ)—enabling seamless integration with standard analog input modules in PLCs, data acquisition systems, or control panels.

Part of CELESCO’s renowned PT800 series, the PT801-0005-611-1111 features a precision wire-wound resistive element and a gold-plated wiper contact, ensuring excellent linearity (±0.1% typical), low hysteresis, and long operational life (>10 million cycles). Its spring-return actuator automatically retracts the shaft to zero position when external force is removed—ideal for non-contacting measurement on moving machinery such as hydraulic cylinder rods, valve stems, or robotic arms.

Housed in a rugged anodized aluminum body with an IP65-rated seal, the CELESCO PT801-0005-611-1111 resists dust, moisture, and oil ingress, making it suitable for harsh environments like power plants, steel mills, or outdoor test rigs. The three-wire analog output (excitation, signal, ground) interfaces directly with 0–10 VDC or 4–20 mA input cards via simple voltage divider circuits, offering a cost-effective alternative to LVDTs or magnetostrictive sensors in medium-accuracy applications.

Widely used since the 1980s, the PT801-0005-611-1111 remains a go-to solution for brownfield system maintenance due to its mechanical robustness, electrical simplicity, and decades-long field-proven reliability.

Technical Specifications

Note: The suffix “611-1111” typically denotes 10 kΩ resistance, spring return, and standard lead configuration.

Main Features and Advantages

High accuracy with simple analog interface:
The CELESCO PT801-0005-611-1111 delivers laboratory-grade linearity using a basic resistive principle—no need for complex signal conditioning or digital protocols. This makes it ideal for retrofitting legacy control systems that rely on 0–10 V or 4–20 mA inputs.

Spring-return plunger for self-centering:
Unlike push-rod or captive-style sensors, the integrated spring ensures the shaft returns to zero when not actuated—perfect for intermittent contact applications like press brake depth sensing or shock absorber testing.

Ruggedized for industrial abuse:
The IP65 seal and metal housing protect internal components from coolant splashes, metal chips, and airborne contaminants. The non-rotating shaft prevents lead wire fatigue during repeated cycling.

Low-cost alternative to LVDTs:
While LVDTs offer higher resolution and infinite resolution, the PT801-0005-611-1111 provides sufficient accuracy for most process control tasks at a fraction of the cost—and without requiring AC excitation or demodulator electronics.

Universal compatibility:
Its passive 10 kΩ output works with virtually any analog input card from GE, Allen-Bradley, Siemens, or National Instruments. A simple 3-resistor network can convert resistance to 4–20 mA if needed.

Proven longevity in critical systems:
Originally designed for aerospace flight simulators and turbine valve positioning, the PT801 series has decades of service in safety-related loops—testament to its mechanical and electrical stability.

Application Field

In power generation, the CELESCO PT801-0005-611-1111 monitors steam valve stem position in fossil fuel and nuclear plants, providing analog feedback to Mark VI or DCS control systems for precise flow regulation.

In material testing machines, it measures compression or tensile displacement in universal testers, where its high repeatability ensures consistent ASTM/ISO compliance across thousands of cycles.

In hydraulic and pneumatic systems, the sensor tracks cylinder rod extension in presses, lifts, and clamping fixtures—often mounted directly to the cylinder cap via custom brackets.

In automotive R&D, the PT801-0005-611-1111 is used in suspension durability rigs to record shock absorber travel under simulated road conditions.

In industrial automation, it serves as a low-cost position verifier for robotic end-effectors, conveyor gate open/close status, or mold alignment in injection molding machines.

Related Products

• PT801-0010-611-1111: Same series with 1.0″ stroke
• PT9000 Series: Higher-performance version with improved linearity and temperature stability
• PT121-0005-103-1111: Compact plastic-housed alternative for light-duty use
• SP2-10K: Signal conditioner module to convert potentiometer output to 4–20 mA
• ACT100: CELESCO’s magnetostrictive sensor line—higher accuracy, no contact wear
• GE IC693ALG220: Analog input module compatible with PT801 resistance signals
• Allen-Bradley 1756-IF8: 8-channel analog input card for Rockwell systems

Installation and Maintenance

Installation Tips:
Mount the CELESCO PT801-0005-611-1111 securely using the two M3 threaded holes on the flange. Ensure the plunger moves parallel to the measured axis to avoid side-loading, which accelerates wear. Use strain relief on the cable to prevent flexing at the gland. Apply a light lubricant (e.g., silicone grease) to the shaft in dry, high-cycle applications to extend life.

Maintenance Recommendations:
Although largely maintenance-free, inspect the sensor periodically for physical damage, cable chafing, or erratic output—signs of internal wiper wear. Clean the shaft with isopropyl alcohol if exposed to sticky contaminants. Avoid exceeding 15 VDC excitation to minimize resistive element heating. For calibration, verify zero and full-scale output with a digital multimeter; minor drift can often be compensated in software.