Schreiber Series SM31 and SM33 Scalable Amplified LVDT Sensor
- Manufacturer: Schreiber Messtechnik
- Category: Displacement, LVDT, Amplified LVDTs, SENSORS
The Schreiber SM31 and SM33 series represent the evolutionary leap towards the amplified LVDT sensor High-performance smart sensor for the industrial sector. Sharing the reinforced mechanical architecture of the analogous passive models—an M30x1.5 threaded body for the SM31, and a robust 25×25 mm chassis for the SM33—they integrate into their internal circuit board a 16-bit A/D and D/A microcontroller. This digitization allows the transducer to filter and correct non-linear deviations using matrices stored in its internal EEPROM memory, obtaining an extraordinary linearity of 0.2% (calibratable in the plant to 0.1%).
Designed for integration and tooling engineering, both series are distinguished by their "Teach-in" function. Technicians can scale the measurement range on-site using hardware simply by bridging logic pins (ANF and END) against the excitation voltage (+UB). This feature allows for reconfiguration of the start and full-scale range of the 4-20mA or ±10V analog loop in less than 5 seconds. Supporting frequencies up to 700 Hz, these linear position sensors They are definitive in dimensional verification without wear, drastically speeding up the coordinated start-up with fast input PLC cards.
Frequently Asked Technical Questions
- Is a programming interface or a special cable required to adapt the 4-20mA output range on-site?
Absolutely not. The process is managed entirely by hardware (Teach-In). By physically placing the sensor at the mechanical zero mark, simply applying primary voltage (+UB) to the "ANF" input for 5 seconds allows the EEPROM to set it as the lower limit (4mA). The process is repeated analogously with the "END" input for the final value. - Are there algorithmic or constructive differences between the SM31 and SM33 families?
Both series feature an identical 16-bit A/D chipset and EEPROM transducer. The difference lies solely in the electromechanical enclosure: while the SM31 is cylindrical in M30x1.5 metric (IP67), the SM33 is a rectangular aluminum pellet rigidly snapped onto horizontal planes (25x25mm).
Thematic integration and perimeter equipment
Properties
| Engineering Specification | Technical Values SM31 / SM33 |
|---|---|
| Measurement principle | Inductive LVDT (With 16-bit Microcontroller) |
| Physical packaging formats | SM31: M30x1.5 threaded | SM33: 25x25mm Aluminum Block |
| Mechanical working range | 5 mm | 10 mm | 15 mm |
| "Tech-in" function (Scaling) | Minimum signal clipping to 20% of the factory limit |
| Internal resolution | Algorithmic D/A – A/D digitization constant in 16 Bit |
| Deviation from linearity | 0.2% constant (Optional supreme adjustment to 0.1%) |
| Excitation voltage (UB) | 10V to 32V DC (Current output) / 15V to 32V (Voltage output) |
| Native output signals | 0-20mA / 4-20mA / 0-5V / 0-10V (Increasing and Decreasing) |
| Carrier limit frequency | 700 Hz (High dynamics in continuous metrology) |
| Levels of environmental protection | SM31: IP67 Sealed | SM33: IP66 Machined |
| Connector interface | M12 connector or 5-pole cable (+ ANF/END logic pins) |
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