SGM-PR20 is a magnetostrictive position sensor with a 304 stainless-steel head and rod sealed to IP68. It measures 25–7500 mm, mounts with an M18×1.5 or M20×1.5 thread, and outputs 4–20 mA, 0–20 mA, 0–10 V, 0–5 V or RS485 Modbus RTU, with SSI on request.
Stainless steel housing with IP68 protection rating, convenient for installation on machine surfaces or in external spaces. Analog output 0-10VDC / 0-5VDC / 4-20mA / 0-20mA; digital output RS485 (modbus RTU) / SSI. Part number prefix SGM stands for the SEGMENsensor magnetostrictive range; the full ordering code is explained below and in the datasheet.
Updated 2026-09-29 · Values from the SGM-PR20 datasheet, Rev A.
All values from the SGM-PR20 datasheet. Orderable range as listed; longer ranges and special temperature or pressure versions on request.
| Parameter | Value |
|---|---|
| Output type | |
| Analog output | 0-10VDC / 0-5VDC / 4-20mA / 0-20mA |
| Digital output | RS485 (modbus RTU) / SSI (on request) |
| Performance | |
| Measuring range | 25–7500 mm |
| Output signal | 0-20mA (max/min load 0/500Ω), 4-20mA (max/min load 0/500Ω), 0-10V (min load >5KΩ), RS485 (MODBUS RTU) |
| Resolution | 16-bit DA |
| Non-linearity | <±0.01%FS (min ±50um) |
| Repeatability | <±0.001% (min ±5um) |
| Update time | <10ms (depending on range); 1ms (1m<range<2m); 2ms (2m<range<3m); 5ms (3m<range<4m) |
| Operating conditions | |
| Magnet speed | any |
| Operating temperature | -40~+85°C |
| Storage temperature | -55~+85°C |
| Humidity | 90% humidity, no frost forming. |
| Temperature coefficient | <30ppm/°C |
| Protection class | IP68 |
| Electrical | |
| Electrical connection | M12*1 waterproof connector or direct cable exit |
| Supply voltage | 24VDC (±20%) |
| Current consumption | <60mA (varies with measurement range) |
| Reverse-polarity protection | Maximum -30VDC |
| Over-voltage protection | Maximum 36VDC |
| Insulation strength | 500VDC |
| Mounting | |
| Mounting orientation | any |
| Mounting | M18*1.5 or M20*1.5 customer-customized position |
| Position magnet | Various ring magnets |
| Materials | |
| Sensor head | 304 stainless steel |
| Protective tube | 304 stainless steel |
| Mounting flange | 304 stainless steel |
Specifications, wiring, dimension drawings and the complete ordering code on two pages. No registration required.
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| 1 | +12V power supply |
| 2 | Power - (GND) |
| 3 | Analog output + |
| 4 | Analog output - |
| 1 | +12V power supply |
| 2 | Power - (GND) |
| 3 | RS485-A |
| 4 | RS485-B |
Build the part number field by field. Outputs or options listed in the specifications but not in the ordering code are available on request.
| Code | Meaning |
|---|---|
| Mounting | |
| 18 | M18×1.5 |
| XX | Custom thread |
| Range | |
| 00025–07500 | 5 digits in mm, 5 mm steps |
| Output | |
| I1F | 4–20 mA, zero at rod end |
| I1R | 4–20 mA reversed (20–4 mA), zero at head |
| I2F | 0–20 mA, zero at rod end |
| I2R | 0–20 mA reversed (20–0 mA), zero at head |
| V1F | 0–10 V, zero at rod end |
| V1R | 0–10 V reversed (10–0 V), zero at head |
| V2F | 0–5 V, zero at rod end |
| V2R | 0–5 V reversed (5–0 V), zero at head |
| R4 | RS485 (Modbus RTU) |
| Connection | |
| K12 | M12 connector |
| C02 … C99 | Direct cable, number = length in m (C02 = 2 m) |
| …X | Suffix X: customer-specified cable |
| Options | |
| (none) | Series standard dead zones |
| Z1 | Short dead zones 30 + 60 mm |
| Z9 | Customer-specified dead zones |
| SGM-PR20-18-00600-I1F-K12 | 600 mm, 4–20 mA, M12 connector |
| Part number | Best for | Range | Output | Protection |
|---|---|---|---|---|
| SGM-PR10 | Hydraulic cylinder position sensor | 25–8000 mm | 4–20 mA / 0–20 mA / 0–10 V / 0–5 V / RS485 / SSI | IP67 |
| SGM-PE10 | Magnetostrictive linear position sensor | 25–8000 mm | 4–20 mA / 0–20 mA / 0–10 V / 0–5 V / RS485 / SSI | IP67 |
| SGM-PR20 | IP68 magnetostrictive position sensor | 25–7500 mm | 4–20 mA / 0–20 mA / 0–10 V / 0–5 V / RS485 | IP68 |
| SGM-PE20 | Slim linear position sensor | 25–4000 mm | 4–20 mA / 0–10 V / RS485 | IP67 |
| SE-PR30 | Intrinsically safe linear position sensor | 25–4000 mm | 0–5 V / 0.5–4.5 V / RS485 | IP67 IP68 |
| SGM-PF10 | Flat head magnetostrictive sensor | 25–8000 mm | 4–20 mA / 0–20 mA / 0–10 V / 0–5 V / RS485 | IP68 |
| SGM-PF20 | Compact magnetostrictive sensor | 25–4000 mm | 4–20 mA / 0–10 V / 0.5–4.5 V / 0.25–4.75 V | IP68 |
| SGM-PR40 | Compact rod position sensor | 25–4000 mm | 4–20 mA / 0–20 mA / 0–10 V / 0–5 V / RS485 | IP68 |
| SGM-PR50 | Miniature linear position sensor | 25–4000 mm | 4–20 mA / 0–20 mA / 0–10 V / 0–5 V / RS485 | IP68 |
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