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The YD322 series submersible level sensor is a hydrostatic liquid‑level measuring transmitter based on high‑performance diffused‑silicon piezoresistive pressure sensing element. It measures liquid depth by detecting hydrostatic pressure generated by liquid column, and outputs standard analog or digital signals for real‑time level monitoring.
Adopting an integrated fully‑welded structure, the sensor features robust mechanical performance. Equipped with IEC 61000‑4‑5 Level‑4 lightning protection and surge protection circuits, it offers excellent anti‑interference ability to adapt to harsh on‑site conditions. The measuring range spans from 0‑1 mH₂O to 0‑300 mH₂O, meeting shallow‑water to deep‑well measurement requirements.
Rich output options are available: 2‑wire 4‑20 mA current signal, multiple 3‑wire voltage outputs, ratiometric signal, and digital interfaces including HART, RS485 and I2C. Wetted parts support optional materials such as 316L stainless steel, tantalum, Hastelloy C‑276 and TC4 titanium alloy to cope with water, oil and mildly corrosive media.
Multiple accuracy grades and temperature versions are configurable. Long‑term stability guarantees reliable continuous operation. It is widely applied in water plants, chemical plants, sewage treatment, deep wells, dams, flood monitoring and irrigation control, and also suitable for level measurement inside small‑caliber pumps and liquid storage tanks.
Feature
Multiple signal output options available
Full welded construction for long‑term durability
Anti‑interference & surge protection
Measuring range: 0~1 mH₂O … 300 mH₂O
Stainless‑steel diaphragm, integrated mechanical design
Lightning protection compliant with IEC 61000‑4‑5 Level‑4 standard
Specification:
| Item | Parameter |
|---|---|
| Measuring Range(Gauge Pressure) | 0…1, 0…3, 0…5, 0…10, 0…20, 0…50, 0…100, 0…200, 0…300 mH₂O |
| Overload Pressure | 3 ~ 500 mH₂O(depends on measuring range) |
| Output Signal | 2‑wire:4…20 mA3‑wire Voltage: DC 0…10V, DC 0…5V, DC 1…5V, DC 0.5…4.5VRatiometric: DC 0.5…4.5VDigital:4…20 mA+HART,4…20 mA+RS485, RS485, I2C |
| Power Supply | 4‑20 mA: DC 8‑30 V0‑10 V: DC 14‑30 V0‑5V /1‑5V /0.5‑4.5V: DC 8‑30V(standard), DC 3‑5V(optional)Ratiometric 0.5‑4.5 V: DC 5V±10%HART: DC 12‑30 VRS485: DC 8‑30V(standard), DC 3‑5V(optional)I2C: DC 3‑5 V |
| Current Consumption | 2‑wire: max.25 mA; 3‑wire ratiometric:8 mA |
| Accuracy(25 ℃) | ≥10 mH₂O:0.5%FS(standard),0.25%FS /0.1%FS(optional)≥3 mH₂O:0.5%FS(standard),0.25%FS(optional)≥1 mH₂O:1%FS(standard),0.5%FS(optional) |
| Operating Temperature | ‑20 ℃ ~85 ℃(standard);‑40 ℃~125 ℃(optional) |
| Compensation Temperature | Range ≥10 mH₂O:0~50 ℃Range ≤10 mH₂O:0~70 ℃(standard),‑10~80 ℃(optional) |
| Storage Temperature | ‑40 ℃ ~125 ℃ |
| Thermal Drift | Zero drift & Full‑scale drift≥10 mH₂O: ±0.03%FS/℃(std), ±0.02%FS/℃(opt)≥1 mH₂O: ±0.05%FS/℃(std), ±0.02%FS/℃(opt) |
| Long‑term Stability | ≤0.2 %FS/Year |
| Response Time | Boot‑up:100 ms(std)/10 ms(opt)Response:10 ms(std)/1 ms(opt)Settling time:15 s(range≥10 mH₂O);1 min(range≤10 mH₂O) |
| Vibration Resistance | 10 g, IEC 60068‑2‑6(resonance condition) |
| Shock Resistance | 500 g, IEC 60068‑2‑27(mechanical shock) |
| Diaphragm Material | Standard:316L; Optional:Tantalum, Hastelloy C‑276, TC4, Al₂O₃ |
| Housing Material | Standard:304SS; Optional:316L, TC4 |
| Cable Material | PUR(std), PE, PTFE, PVC(optional) |
Ordering Selection Table
Ordering format: SML-HP322‑Range‑Output‑Power‑Accuracy‑Temp‑Cable‑CableLength‑Options
| Code Item | Available Options |
|---|---|
| Model | SML-HP322 |
| Measuring Range | 0‑1mH₂O,0‑3mH₂O,0‑5mH₂O,0‑10mH₂O,0‑20mH₂O,0‑50mH₂O,0‑100mH₂O,0‑200mH₂O,0‑300mH₂O |
| Output Signal | 4‑20mA;0‑10V;0‑5V;1‑5V;0.5‑4.5V;0.5‑4.5V(Ratiometric);4‑20mA+HART;4‑20mA+RS485;RS485;I2C |
| Power Supply | STD(standard), LV(3‑5V low‑voltage) |
| Accuracy | STD(0.5%FS);0.25%FS;0.1%FS;1.0%FS;0.5%FS(opt) |
| Temperature Grade | STD(‑20~85℃);EXT(‑40~125℃) |
| Cable Material | PUR;PE;PTFE;PVC |
| Cable Length | Custom length in meters |
| Extra Options | Lightning protection, special diaphragm/housing material |
Wiring Definition
| Wire Color | 2‑wire | 3‑wire | 4‑wire(RS485) |
|---|---|---|---|
| Red | V+ | V+ | V+ |
| Green | V‑ | V‑ | V‑ |
| Yellow | ‑ | Signal | RS485‑A(S+) |
| Blue | ‑ | ‑ | RS485‑B(S‑) |
Water treatment plants & chemical plants
Sewage treatment
Deep wells, dams
Flood monitoring & irrigation control
