Schreiber SM210 – Miniature LVDT sensor Ø10 mm
- Manufacturer: Schreiber Messtechnik
- Category: Displacement, LVDT Unamplified, SENSORS, LVDT Sensors
He Schreiber SM210 it's a Miniature LVDT for measuring linear displacements of 5, 10, 15 or 20 mm. With a body of only Ø10 mm, It can be installed in mechanisms where available space is limited, such as actuators, control tools, test benches, or various moving parts of a machine.
The sensor does not incorporate conditioning electronics. The sensor is installed directly at the point where the movement occurs, and the electronics can be placed separately, for example, in the electrical cabinet or next to the data acquisition system. This maintains a very compact installation on the machine, and with the appropriate signal conditioner, signals such as 4–20 mA, 0–10 V or ±10 V.
According to the application, the SM210 can be used with mobile core, coupled to the mechanism whose displacement is to be measured, or with probe and spring return for dimensional controls, parts inspection and verification tools.
Standard linearity is less than 0,5 %. For travels of 5, 10 and 15 mm, a linearity version is also available. 0,25 %; The 20 mm version is supplied with linearity of 0.5 %.
The SM210 is part of the range of inductive sensors of Schreiber Meßtechnik, a German manufacturer specializing in displacement measurement and the conditioning electronics associated with this type of sensor.
SM210 at a glance
- Routes: 5, 10, 15 and 20 mm.
- Body diameter: Ø10 mm.
- Linearity: <0.5 %; 0.25 % option for 5, 10 and 15 mm.
- Mounting: movable core or spring-return probe.
- Protection: IP67 with M12 connection and IP68 with cable output.
- Temperature: -20…+85 °C with connector and -20…+105 °C with cable.
- Electronics: external conditioning.
- Mechanical resistance: 20 g RMS vibration and 250 g SRS shock.
How the Schreiber SM210 works
The SM210 measures displacement using a differential inductive principle. Inside the sensor is a coil system through which a movable Ni-Fe alloy core travels axially. As the core's position changes, the sensor's inductance distribution also changes.
External electronics excite the sensor and convert that variation into a signal proportional to the displacement. The SM210 uses an inductive configuration of half bridge, Therefore, conditioning electronics compatible with this measurement principle must be used.
Because there is no sliding electrical contact between the core and the coils, the wear associated with the measuring principle is very low. This makes it particularly suitable for measuring repetitive movements in machinery, testing equipment, and control systems.
SM210 assembly: moving core, probe and fixation
Mounting with moving core
In this configuration, the sensor body is fixed to the static part of the machine or test equipment, while the core is attached to the element whose movement is to be measured.
The movement must occur in the same direction as the sensor axis. Misalignment, lateral loads, or friction that could hinder the free movement of the core should be avoided.
The rod has a diameter of Ø3 mm and ends in a M2 thread, which facilitates its attachment to the mechanism.
Mounting with probe
The versions with suffix .T They incorporate a probe and a return spring. In this case, the body remains fixed and the tip rests directly on the part or surface to be inspected.
The spring keeps the probe in contact with the surface and transmits its movement to the sensor core. The approximate spring force is 2 N.
This version is especially useful for checking heights, thicknesses, final positions, or small dimensional variations in mechanical parts and assemblies.
Body fixation
To mount the Ø10 mm body, Schreiber offers specific brackets such as the references SM906.202 and SM906.203.
The 20 mm dimension shown in the drawing of these brackets corresponds to the distance between the clamp's fixing points. It is not a PCD or a flange specific to the sensor.
Dimensions of the SM210 according to the route
The body diameter remains at Ø10 mm throughout the series, but the length changes depending on the selected stroke.
| Route | L1 | L2 | L3 approx. | L4 |
|---|---|---|---|---|
| 5 mm | 35 mm | 40 mm | 18 mm | 64 mm |
| 10 mm | 35 mm | 40 mm | 18 mm | 64 mm |
| 15 mm | 35 mm | 50 mm | 28 mm | 74 mm |
| 20 mm | 35 mm | 50 mm | 30 mm | 74 mm |
To design the final housing or machine a support, the drawing corresponding to the specific execution of the sensor must always be checked.
Electrical connection, signal conditioning and PLC
M12x1 connection
The version with suffix .S It uses an M12x1 connector. The assignment indicated by Schreiber is as follows:
| Pin | Sign |
|---|---|
| 1 | WP |
| 2 | Not connected |
| 3 | WM |
| 4 | MS |
Wired versions
- White: WM.
- Brown: MS.
- Green: WP.
Depending on the chosen reference, the SM210 can be supplied with flat cable, radial cable or PUR radial cable.
Conditioning electronics
The SM210 does not directly deliver a 4–20 mA or 0–10 V signal. To connect it to a PLC, acquisition card, or recorder, compatible excitation and conditioning electronics are required.
Schreiber has the families SM10 and SM12 to work with this type of sensor. Depending on the selected module, outputs such as the following can be obtained:
- 0–20 mA.
- 4–20 mA.
- ±20 mA.
- 0–10 VDC.
- ±10 VDC.
In a machine, this arrangement allows only the small sensor to be placed next to the mechanism and the electronics to be kept in the electrical panel, where it is easier to power, adjust and connect it to the control system.
Environmental conditions and limits of use
The degree of protection and the maximum working temperature depend on the electrical version chosen.
- M12 connector: IP67 and temperature of –20…+85 °C.
- Wired output: IP68 and temperature of –20…+105 °C.
- Vibrations: 20 g RMS.
- Shock: 250 g SRS.
- Drift from zero with temperature: <0.005 %/°C.
If the sensor is going to work outdoors, submerged or exposed to special environmental conditions, it is advisable to review the specific implementation before defining the final assembly.
How to choose the right version of the SM210
To select the appropriate reference, it is advisable to first define how the movement will be measured and what conditions the installation will have.
1. Route
The first step is to know the total displacement that needs to be measured and choose between the 5, 10, 15 or 20 mm versions.
2. Linearity
The standard version offers linearity lower than 0.5 %. The 0.25 % option can also be selected for travel lengths of 5, 10, and 15 mm.
3. Mounting type
If the core can be attached directly to the mechanism, the conventional version is used. For direct measurement on a workpiece or surface, the version with a probe is more suitable.
4. Available space and alignment
It must be verified that there is sufficient space for the body, the core travel and the fixing system, and that the movement occurs correctly on the sensor axis.
5. Working conditions
It is necessary to take into account the temperature, the degree of protection required, the vibrations and the shocks that the collector may receive.
6. Connection
The installation may require a connector, flat cable, radial cable, or PUR cable, in addition to a certain cable length.
7. Signal for the control system
Finally, it must be defined what signal the PLC or acquisition system needs in order to choose the corresponding conditioning electronics.
Schreiber SM210 references and order code
The SM210 reference allows you to identify the path, the linearity class, and the different execution options.
SM210 . [path] . [linearity] . [options]
Base references
| Route | Linearity 0.25 % | Linearity 0.5 % |
|---|---|---|
| 5 mm | SM210.5.1 | SM210.5.2 |
| 10 mm | SM210.10.1 | SM210.10.2 |
| 15 mm | SM210.15.1 | SM210.15.2 |
| 20 mm | — | SM210.20.2 |
Execution options
| Code | Description |
|---|---|
| .K | Output via flat cable. |
| .Ky | Flat cable length defined according to order. |
| .L | Output via radial cable. |
| .Ly | Radial cable length defined as ordered. |
| .LP | Output via PUR radial cable. |
| .LPy | PUR cable length defined according to order. |
| .S | Execution with connector. |
| .T | Execution with probe and spring return. |
| .AND | Execution intended for series of 100 units or more, with the specifications defined by Schreiber for this version. |
| .X | Special tour available upon request. |
Reference example
SM210.10.2.ST corresponds to an SM210 of 10 mm of travel, linearity of 0,5 %, execution with feeler and connector.
Special references and option combinations must be confirmed according to current Schreiber documentation and the requested execution.
SM210 Applications
Machinery and automation manufacturers
Due to its small diameter, the SM210 is particularly interesting when linear movement needs to be measured inside a machine and there is hardly any space to install the sensor.
- Actuator stroke control.
- Position measurement of carts and linear mechanisms.
- Monitoring of closing and positioning mechanisms.
- Displacement control in pressing systems.
- Measurement of the movement of guides and moving elements.
- Position feedback.
- Control of small displacements during machine cycles.
Dimensional control and tooling
The probe version allows direct measurement on a part or surface, so it can be used in control fixtures and automatic verification stations.
- Height measurement.
- Thickness measurement.
- Dimensional comparison between parts.
- Final position check.
- Control of small deformations.
- Automatic inspection tools.
Test benches
In a test bench, displacement can be recorded along with other variables such as force, pressure, torque, or temperature to analyze the behavior of a mechanism or component.
- Force-displacement tests.
- Characterization of actuators.
- Mechanism tests.
- Race control.
- Fatigue tests.
- Measurement of expansion or contraction.
Structural monitoring and civil works
The SM210 can also be used to measure small relative displacements in trials or monitoring systems, provided that their path and the installation conditions are compatible with the chosen execution.
- Small travel joint movement.
- Deformation control.
- Structural element tests.
- Instrumentation of test specimens and load benches.
When longer travel distances or permanent installation in particularly demanding environmental conditions are required, it is advisable to select another model from the range that is specifically designed for those conditions.
Accessories and associated electronics
| Reference / family | Application |
|---|---|
| SM906.202 | Clamp for securing the sensor body. |
| SM906.203 | Clamp for securing the sensor body. |
| SM901.210 | Straight M12 connector. |
| SM901.212 | M12 angled connector. |
| SM10 | Family of conditioning electronics for inductive sensors. |
| SM12 | Family of conditioning electronics with different analog outputs. |
Frequently Asked Questions about the Schreiber SM210
Does the SM210 incorporate electronics?
No. The SM210 requires external electronics to excite the sensor and condition the signal.
Can it connect directly to a PLC?
Not directly. A compatible signal conditioner is required to obtain an industrial signal such as 4–20 mA or 0–10 V.
What tours are available?
The nominal travels are 5, 10, 15 and 20 mm.
Is there a 20mm version with 0.25 linearity %?
Not as a standard version. The 0.25 % option is available for 5, 10, and 15 mm strokes.
What is the difference between a mobile core and a probe?
With a moving core, the core attaches to the mechanism whose movement is to be measured. In the probe version, a spring keeps the tip in contact with the surface and transmits the movement to the core.
What data does GUEMISA need to select the SM210?
It is advisable to specify the path, the required linearity, the available space, the type of movement, the mounting method, the environmental conditions, the type of connection, and the signal that the PLC or acquisition system should receive.
Schreiber SM210 Selection
GUEMISA can help you define the right combination of travel, linearity, assembly, connection, and conditioning electronics depending on the machine or measuring system.
To study the application, please tell us the displacement you need to measure, the available space, how the mechanism moves, the environmental conditions, and the signal that the PLC or acquisition system should receive.
The complete technical specifications of the SM210 can be found in the Properties table on this sheet.
Properties
| Specification | Schreiber SM210 |
|---|---|
| Sensor type | Miniature LVDT / Inductive Linear Displacement Sensor |
| Integrated electronics | No; it requires external conditioning |
| Nominal travel distances | 5 / 10 / 15 / 20 mm |
| Body diameter | Ø10 mm |
| Diameter tolerance according to drawing | Ø10 / –0.04 mm |
| Standard linearity | <0.5 % |
| Linearity option | 0.25 % for 5, 10 and 15 mm strokes |
| 20 mm travel | Linearity 0.5 % |
| Sensitivity 5 / 10 mm | 400 mV/mm (±10 %) |
| Sensitivity 15 / 20 mm | 300 mV/mm (±10 %) |
| Protection rating with M12 | IP67 |
| Degree of protection with cable | IP68 |
| Temperature with connector | -20…+85 °C |
| Wired temperature | -20…+105 °C |
| Drift from zero with temperature | <0.005 %/°C |
| Vibration resistance | 20 g RMS |
| Shock resistance | 250 g SRS |
| Sensor weight | Approx. 10 g |
| Core weight | Approx. 4 g |
| Probe force | Approx. 2 N |
| Rod | Ø3 mm, M2 threaded end |
| Core | Ni-Fe Alloy |
| Mechanical configurations | Moving core or probe with spring return |
| Connections | M12, flat cable, radial cable and PUR radial cable as per execution |
| Compatible electronics | Schreiber SM10 / SM12 |
| Outputs via air conditioner | 0/4–20 mA, ±20 mA, 0–10 VDC or ±10 VDC depending on electronics |
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