Alliance Sensors S2A LVDT Signal Conditioner
S2A: DIN LVDT conditioner, push-button cal, 8 analog outs + RS-485. RFQ + selection help.
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Smart AC-LVDT signal conditioner for power-gen and turbine valve feedback — push-button calibration, comprehensive diagnostics, eight analog DC outputs, and half-duplex RS-485 setup in a DIN-rail module.
Key advantages
- Power-gen focused — OEM targets steam-valve, governor/throttle, interceptor/stop, and boiler-feedwater LVDT loops.
- Wide sensor match — Excitation 1/3/5/10 kHz; LVDT FS outputs 50–5000 mVrms; push-pull or single-ended drive.
- Eight analog DC outs — 0–5 / 1–5 / 0.5–4.5 / 0.5–9.5 / 0–10 / ±10 V plus 0–20 / 4–20 mA sourcing.
- Smart calibration + diagnostics — Front-panel zero/FS; null LEDs; open/short/cable/output fault detection; cybersecurity lock.
- RS-485 + auto-master sync — Multi-drop setup; master can sync up to fifteen modules for fail-safe excitation.
Typical applications
- Steam turbine valve position feedback.
- Governor, throttle, interceptor, and stop-valve LVDT loops.
- Boiler feedwater pump position sensing.
- Multi-channel LVDT racks needing synchronized excitation.
Selection guide
- Output type — Voltage vs 4–20 mA; bipolar ±10 V needs +15/−15 V rails.
- Excitation — Frequency and push-pull vs single-ended for the LVDT primary.
- Networking — RS-485 address plan; master/slave sync count.
- Legacy — Confirm S1A replacement compatibility if hot-swapping older modules.
Common mistakes
- Expecting ±10 V from a single 24 V supply — OEM requires +15 and −15 V for bipolar output.
- Leaving cybersecurity lock off in critical infrastructure cabinets.
- Ignoring loop resistance — up to 850 Ω at 24 VDC for current outputs.
- Mixing incompatible excitation frequency with a high-impedance LVDT without checking FS mVrms.
When to RFQ / what to tell us
- Analog output type; excitation needs; RS-485/master sync; quantity; ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 49006 |
| Brand | Alliance Sensors Group (H.G. Schaevitz) |
| Model | S2A |
| Product type | DIN-rail AC-LVDT signal conditioner |
| Operating power | +15…+30 VDC (24 V nom.), 100 mA max @ 24 V |
| Excitation | 1.5 / 3.0 / 4.5 Vrms class; 1/3/5/10 kHz |
| LVDT FS range | 50–5000 mVrms |
| Analog outputs | 6 voltage ranges + 0–20 / 4–20 mA |
| Non-linearity | ≤±0.025% of FSO |
| Digital | RS-485 half-duplex; 16 addresses |
| Sync | Auto-master to 15 modules |
| Operating temp | −20…75 °C |
| Diagnostics | Open/short/ground/cable/output faults; null LEDs |
Documents
FAQ
Q: Is S2A only for power plants? A: OEM highlights power-gen valve/turbine duty, but any AC-LVDT/RVDT/half-bridge in range can be conditioned.
Q: Can I calibrate without pots? A: Yes — front-panel push buttons or RS-485 ASCII commands set zero and full scale.
Q: What should I send for a quote? A: Output type, LVDT excitation needs, sync/network plan, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Status | Specs pending OEM datasheet merge |