Schreiber Series SM41 and SM43 Scalable Amplified LVDT Sensor
- Manufacturer: Schreiber Messtechnik
- Category: Displacement, LVDT, Amplified LVDTs, SENSORS
The Schreiber SM41 and SM43 series define the standard in the digitalization of large displacement measurement. Part of the prestigious Schreiber catalog amplified LVDT sensors, These units operate on the thoroughly tested electromechanical base of the SM40 (general hydraulics) and SM42 (extra short chassis version) series. Encapsulated in cylinders of 25 mm in diameter, The innovation lies in its logical core: a set of microcontroller and 16-bit D/A – A/D converters that transform the reading of the extended paths (up to 360 mm) into purely scalable and digitally linearized signals through their EEPROM.
For the instrumentation of bottling plants, sawmills, or the control of critical valves, its star quality is the on-site adjustment (Teach-in). Engineers can define the beginning and end of the production scale simply by connecting the input logic pins («ANF» and «END») to the excitation voltage (+UB). This action instantly adapts the signal gradient (4-20mA, 0-10V, or ±10V) to the actual operating range, eliminating the need for invasive programming consoles. Designed to IP67 and IP68 immersion standards, they are the linear position sensors preferred for noisy environments where submillimeter bit-level readings determine traceability. Please inquire about the RS485 digital interface option for this equipment..
Frequently Asked Technical Questions
- What calibration advantage does the SM41 series offer compared to the conventional analog SM40 series?
The SM41 series features EEPROM memory and a 16-bit processor. If your mechanical application only uses the 25% of the sensor's total range, you can electronically scale that specific segment so that the 4-20mA output provides maximum resolution right there. This process is called hardware teach-in and it is impossible to do with the standard SM40. - Key differences between installing an SM41 series sensor and an SM43 series sensor
Both share the same 25-millimeter diameter, communications interface, and mechanical ranges of up to 360 mm. The difference lies in the geometric housing: while the SM41 replicates the standard industrial-length housing, the SM43 variant incorporates a modified coil winding that allows for a remarkably shortened overall length of its outer metal casing for machinery in lethally confined spaces.
Properties
| Engineering Specification | Technical Values SM41 / SM43 |
|---|---|
| Measurement principle | Inductive LVDT (16-bit Microcontroller / EEPROM) |
| Diameter of the metal casing | Ø 25.0 mm |
| Constructive differential of series | SM41: Standard Length | SM43: Reduced Length Design |
| Mechanical stroke range | From 20 mm to 360 mm (Multiple sub-headings) |
| Internal resolution and correction | Infinite D/A – A/D digitization operated at 16 Bit |
| Analog output adjustment (On-site) | Allowable reduction up to 20% of the total bottom of scale |
| Error deviation (Linearity) | 0.2% (Electronically corrected margins, capped at 0.1%) |
| Excitation voltage range | 10 … 32 V DC for currents / 15 … 32 V amplified (voltage) |
| Supported output profiles | 4-20 mA | 0-10 V | 0-20 mA | 0-5 V (All programmable inverted) |
| Static environmental robustness | IP67 base rating / IP68 for versions with hermetically sealed shielded cable |
| Optional external digital signal | Offered under native RS 485 architecture |
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