Positron Series DSA — 32mm Body · 100 to 750 mm · 24V DC · 4–20 mA Output
Key Specifications
Positron Series DSA
The Series DSA is a 24V DC-powered displacement transmitter with a built-in signal conditioner, 32mm stainless steel body, and 4–20 mA current loop output. Current loop output permits direct connection over very long cable runs to PLCs, DCS systems, and recorders without signal degradation — ideal for industrial process plants and hydro-power installations.
With 12 standard models covering 100 mm to 750 mm total stroke, the DSA is designed for long-stroke quasi-static displacement and position measurement. Applications include hydro turbine guide vane position, hydraulic actuator feedback, and process plant monitoring. To convert 4–20 mA to a voltage signal, connect a 250 Ω resistor across the output (1–5 V). All units ship with NABL-accredited factory calibration.
Models
| Model | Full Stroke Range | Housing Length (mm) | Mech. Stroke (mm) | Linearity (% FSR) |
|---|---|---|---|---|
| 050DSA | 0–100 mm | 390 | 110 | ±0.5% |
| 075DSA | 0–150 mm | 496 | 160 | ±0.5% |
| 085DSA | 0–170 mm | 515 | 180 | ±0.5% |
| 095DSA | 0–190 mm | 545 | 200 | ±0.5% |
| 100DSA | 0–200 mm | 565 | 220 | ±0.5% |
| 150DSA | 0–300 mm | 755 | 320 | ±0.5% |
| 175DSA | 0–350 mm | 850 | 380 | ±0.5% |
| 200DSA | 0–400 mm | 975 | 430 | ±0.5% |
| 250DSA | 0–500 mm | 1135 | 540 | ±0.5% |
| 300DSA | 0–600 mm | 1460 | 640 | ±0.8% |
| 350DSA | 0–700 mm | 1670 | 740 | ±0.8% |
| 375DSA | 0–750 mm | 1780 | 770 | ±0.8% |
085DSA and 095DSA are non-standard intermediate models. Custom stroke ranges also available (e.g. 080DSA: 0–160 mm, 125DSA: 0–250 mm) — contact us for specs.
Use Cases
Measure guide vane position in hydro-power turbines where the LVDT may be far from the control room. 4–20mA current loop eliminates signal loss over long cable runs.
Direct integration with process controllers, DCS, and SCADA systems using the standard 4–20mA process signal — no additional signal conditioning required.
Monitor piston and rod position in hydraulic actuators for closed-loop position control in industrial machinery and process equipment.
4–20mA current loop output is immune to cable resistance and capacitance effects, making it ideal for installations where sensor and controller are separated by long cable runs.
Measure long-stroke structural deflection, settlement, and displacement in civil engineering applications where remote readout over long distances is needed.
Optimised for quasi-static and slowly varying displacements from 100mm to 750mm total stroke — suited to slow processes where dynamic response is not a requirement.
Resources
Series DSA — DC LVDT Current Output Datasheet
Complete specifications, dimensions, and ordering information (PDF)
Our engineers will recommend the right LVDT for your application and help with signal conditioning and integration.
FAQ
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