Schreiber SM69 Series Contactless Multiturn Angular LVDT Sensor
- Manufacturer: Schreiber Messtechnik
- Category: Displacement, LVDT, Angled LVDT, SENSORS
The Schreiber SM69 Series represents the pinnacle of frictionless rotational capture. Operating under the technical umbrella of angular LVDT sensor (or RVDT), this transducer replaces the antiquated resistive track of potentiometers with a sophisticated absolute magnetic array. Integrated electronics evaluate the rotation of an external diametral magnet without any mechanical contact, achieving a mechanically infinite lifespan. Manufactured on a subminiature steel chassis of Ø 22 mm Sealed with epoxy resin to IP68 rating, it is virtually invulnerable to water, embedded dust and severe vibrations (20g rms).
At the PLC integration level, the SM69 is not merely a quarter-turn meter. It is an analog encoder. absolute multi-turn ("Multi-turn") up to 9 bits per cycle, whose internal EEPROM/FRAM memory retains the exact rotational position even if the machine is turned off. The user can program the device to deliver its full analog range (0-10V) throughout 1 to 64 complete revolutions of the machine. Available in a version with a 6 mm physical axis or in a fully decoupled version (floating magnet separated by 1.5 mm from the sensor), it is the transverse position sensor Ideal for bevel gear reducers, textile cams and marine servomotors. Please contact us to configure your RS422/485 (SSI) digital output variant equivalent to the SM699 model..
Frequently Asked Technical Questions
- What does the "Contactless with separate magnet" configuration mean compared to the classic shaft configuration?
The series offers two configurations. The ".W" variant includes a classic 6 mm steel shaft on bearings for screwing in couplings. In contrast, the ".M" geometric variant does away with the shaft altogether; the user screws a loose magnetic pad directly onto the rotating point of their machine and positions the SM69 1.5 mm away. With no physical contact, friction and wear on limiting gears are completely eliminated. - If there is a power outage in the production facility, does the transducer lose track of the revolutions made?
Absolutely not. The device operates as a pure absolute evaluator. In the event of a power outage or a sudden restoration of power to its 12V/24V pins, its internal controller dumps the fractional position and the number of revolutions (out of a possible 64) to its integrated solid-state memory (EEPROM/FRAM). When power is restored, the analog dump instantly returns to the exact metric mark prior to the power outage.
Properties
| Engineering Specification | Technical Values SM69 |
|---|---|
| Principle of physical measurement | Absolute Angular / Rotational by two-dimensional magnetic field |
| Perimeter casing dimension | Diameter Ø 22.0 mm (Completely resin injected) |
| Resolution and angular range | 6 Bits or 9 Bits calibratable from 1 to 64 whole revolutions |
| Absolutely Secure Functionality | Lossless power-resistant EEPROM storage |
| Maximum capture speed | ≤ 2,500 RPM (Revolutions per minute in shaft-driven model) |
| PLC unit output signals | 0-10 V DC | 0.5-9.5 V DC | Digital synchronous SSI |
| Excitation voltage band | 10V, 12V or 24V DC variant |
| Machine coupling versions | Ø6 mm shaft (.W) or diametral non-contact floating magnet (.M) |
| Structural rigidity according to IP regulations | Absolute sealing level IP68 for prolonged immersion |
| Limit thermal fixation | -20°C to +85°C without severe magnetic drift |
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