Schreiber Series SM31 and SM33 Scalable Amplified LVDT Sensor
- Manufacturer: Schreiber Messtechnik
- Category: Displacement, Amplified LVDTs, SENSORS, LVDT Sensors
The Schreiber SM31 and SM33 series are amplified LVDT sensors with microcontroller. M30x1.5 threaded body (SM31) and 25x25 mm body (SM33). The internal board incorporates a microcontroller with 16-bit A/D and D/A conversion. It corrects nonlinear deviations using matrices stored in the internal EEPROM memory. Linearity: 0.2% (calibratable to 0.1%).
Teach-in function: The measurement range is scaled by hardware, bridging the ANF and END logic pins against the excitation voltage (+UB). The start and full-scale values of the 4-20 mA analog loop are reset in less than 5 seconds. Frequency limit: 700 Hz. Working ranges: 5, 10, and 15 mm. Excitation voltage: 10 V to 32 V DC (current output) and 15 to 32 V (voltage output). Outputs: 0-20 mA, 4-20 mA, 0-5 V, and 0-10 V, rising and falling. Protection: IP67 (SM31) and IP66 (SM33). Connection: M12 connector or 5-pin cable. Applications of these linear position sensors: dimensional verification.
Frequently Asked Technical Questions
- Is a programming interface or a special cable required to adapt the 4-20mA output range on-site?
No. Scaling is performed by hardware (Teach-in). With the sensor at the mechanical zero mark, +UB is applied to the ANF input for 5 seconds, and the EEPROM sets that point as the lower limit (4mA). The process is repeated for the end point using the END input. - What are the differences between the SM31 and SM33 families?
Both series use the same 16-bit A/D chipset with EEPROM. The enclosure differs: the SM31 is a cylindrical M30x1.5 (IP67) and the SM33 is a rectangular aluminum block of 25×25 mm (IP66), for mounting on horizontal surfaces.
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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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