The Balluff Model BTL7-E501-M0150-P-S115 Profile-Style Magnetostrictive Linear Position Sensor (Order Code: BTL1944), engineered and manufactured by Balluff GmbH, represents the seventh generation of industry-standard Micropulse® non-contact linear displacement sensing technology.

Core Distinction: S115 (M12) vs. S32 (M16) Connectivity:
While the S32 variant incorporates a legacy 8-pin M16 DIN connector, the BTL1944 features a standardized 8-pin male M12x1 connector (S115). This compact M12 footprint provides significant space savings at the sensor terminal head, aligns with modern pre-molded industrial cordset standards, and ensures vibration-proof connectivity across high-acceleration automated machinery.

Operating Principle & Magnetostrictive Reliability:
The sensor operates based on non-contact magnetostrictive time-of-flight acoustic measurement. Inside the extruded aluminum profile, a precision waveguide is subjected to a momentary current pulse, producing a circular magnetic field. When this field intersects the longitudinal field of a permanent magnet slider traversing along the housing, a torsional acoustic wave is generated. The sensor head detects this sonic pulse and calculates elapsed transit time into an exact absolute position output with zero physical wear between the sensing elements and the machine slide.

Model Code Breakdown & Configuration (BTL7-E501-M0150-P-S115 / BTL1944):
- BTL7: Generation 7 magnetostrictive architecture featuring upgraded processor throughput, high noise immunity, and fast sampling rates.
- E501: Dual complementary analog current outputs: Output 1 delivers a forward-acting 4 to 20 mA signal, while Output 2 provides a reverse-acting 20 to 4 mA signal across the measuring range.
- M0150: Calibrated active nominal measuring stroke of 150 mm (Metric).
- P: Robust extruded aluminum profile-style housing engineered for external machinery axis mounting.
- S115: Modern, compact 8-pin male M12x1 industrial connector.

Key Engineering Features & Operational Advantages:
- Non-Contact, Wear-Free True Absolute Sensing: Delivers instantaneous, true absolute position feedback immediately upon power-up without requiring reference homing cycles. Unlike potentiometric linear transducers with mechanical sliding wipers, magnetostriction has zero contact friction, eliminating contact bounce, electrical noise, and mechanical wear over decades of operation.
- High Sampling Frequency Up to 4,000 Hz: With a rapid 4 kHz internal sampling rate, the sensor provides real-time motion feedback essential for dynamic proportional hydraulics, high-speed press synchronization, and closed-loop servo controls.
- Micro-Level Repeat Accuracy (±5 µm): Delivers a repeat accuracy of ±5 µm and a maximum non-linearity of just ±50 µm across the entire 150 mm measuring span, ensuring micro-meter repeatability in precision stamping and injection tooling.
- Dual Complementary Current Outputs (4-20 mA & 20-4 mA): Offers dual simultaneous current signals, giving automation engineers the flexibility to configure forward or reverse directionality in software, or to use both channels for redundant safety monitoring on critical industrial presses.
- Rugged IP67 Anodized Aluminum Profile: Machined from heavy-duty extruded anodized aluminum sealed against particulate ingress and water jets (IP67 with mating S115 cordset). Designed to operate from -40°C to +85°C, it withstands high thermal loads near hot hydraulic cylinders, plastic melts, and stamping dies.

Target Industrial Sectors & Applications:
- Plastics & Rubber Machinery: Mold clamping position, plasticizing screw travel, and ejector stroke feedback on servo-hydraulic injection molding machines.
- Metal Forming & Stamping: Ram displacement and hydraulic cushion monitoring on stamping presses, hydraulic press brakes, and deep drawing machinery.
- CNC Machine Tools & Woodworking: Multi-axis position tracking on CNC milling tables, high-speed gantries, and automated beam saw stops.
- Steel Mills & Heavy Metallurgy: Hydraulic cylinder position control on roll gap positioning stands and furnace charger carriages.
- Civil Engineering & Hydropower: Sluice gate position verification and wind turbine hydraulic blade pitch control.

• Manufacturer: Balluff (Balluff GmbH)
• Country of Origin: 100% EU / China (conforming to global Balluff manufacturing standards)
• Product Line: BTL7 Profile Series Magnetostrictive Linear Transducers (Micropulse)
• Order Code: BTL1944
• Part Number / Model: BTL7-E501-M0150-P-S115
• Measurement Principle: Non-contact Magnetostrictive Technology
• Measurement Mode: True absolute position (no homing required upon power restoration)
• Active Nominal Measuring Stroke: 150 mm
• Output Interface: Analog Current (Dual output channels)
• Output Configuration:
  - Output 1: 4 to 20 mA (forward-acting / rising)
  - Output 2: 20 to 4 mA (reverse-acting / falling)
• Maximum Sampling Frequency: 4000 Hz (4 kHz)
• Repeat Accuracy: ±5 µm (±0.005 mm)
• Maximum Non-Linearity: ±50 µm
• Temperature Coefficient: ≤ 30 ppm/K (at 50% of nominal stroke)
• Operating Supply Voltage (Ub): 10 to 30 VDC
• Current Consumption: ≤ 150 mA @ 24 VDC
• Maximum Load Resistance: ≤ 500 Ohm
• Supported Position Magnets: Up to 2 magnets simultaneously
• Compatible Position Magnets: Captive slider magnets (BTL5-P-4500-1) or floating block magnets (BTL5-M-2814-1S)
• Housing Metallurgy: Extruded Anodized Aluminum profile housing
• Electrical Termination: 8-pin male M12x1 connector (S115 designation)
• Ingress Protection Rating: IP67 compliant with IEC 60529 (when mated with suitable connector)
• Operating Ambient Temperature: -40°C to +85°C (-40°F to +185°F)
• Storage Temperature: -40°C to +100°C (-40°F to +212°F)
• Mechanical Shock Rating: 150g / 6 ms and 100g / 2 ms conforming to IEC 60068-2-27
• Mechanical Vibration Rating: 20g, 10 to 2000 Hz conforming to IEC 60068-2-6
• Regulatory Compliance: CE marked, cULus Listed, UKCA, WEEE, RoHS compliant.