Key Features Of The SLS-CD Ceramic SDI-12 Level Sensor
Ceramic Sensor With SDI-12 Output
Combines a corrosion-resistant Al2O3 diaphragm with a version 1.4 SDI-12 digital interface.Level And Temperature As Standard
Two measurements from one sensor, with built-in density correction.Stainless Steel Or Marine Bronze
316 stainless steel, or marine bronze CA104 for seawater and saline sites.Ultra-Low Power
Under 250 µA idle and under 4 mA active from 6 to 36 VDC.Up To Nine Sensors Per Bus
Addressable sensors share one cable to the data logger.Submersible To 100 m
IP68 with a high-integrity cable gland and vented PUR cable.
Applications For Ceramic SDI-12 Level Sensors
The SLS-CD is designed for remote, low-power level monitoring in demanding liquids:
- Wastewater networks – level monitoring in sewers, wet wells and overflows with telemetry.
- Coastal and estuary monitoring – tide and water level logging with the marine bronze housing.
- Rivers, reservoirs and boreholes – long-term records on SDI-12 logging networks.
- V-notch weir flow measurement – digital head measurement for open-channel flow.
- Flood defense monitoring – battery and solar-powered early warning stations.
- Environmental research – unattended monitoring programs and field studies.
Digital Level Monitoring For Harsh Liquids
Remote monitoring sites often combine two challenges: limited power and difficult liquids. The SLS-CD addresses both. Its ceramic Al2O3 diaphragm withstands wastewater, seawater and liquids carrying solids, while the SDI-12 interface lets the sensor sleep between readings so that a battery or small solar panel can run the site for long periods.
An onboard 16-bit microprocessor linearizes and temperature-compensates each reading and uses the integrated temperature sensor to correct for liquid density. The data logger receives calibrated level and temperature values directly, and the SDI-12 software tools can be used for calibration, logging and diagnostics.
Power And Communications
- Interface – SDI-12 version 1.4
- Measurements – level and temperature
- Supply voltage – 6 to 36 VDC
- Current consumption – under 250 µA idle, under 4 mA active
- Sensors per bus – up to 9
Level Ranges
Ranges are specified in meters of water gauge (mWG).
| Range (mWG) | Approx. Depth (ft of water) |
|---|---|
| 5 | 16.4 |
| 10 | 32.8 |
| 20 | 65.6 |
| 30 | 98.4 |
| 50 | 164 |
| 100 | 328 |
SLS-CD Submersible Level Sensor Technical Specifications
| Specification | Detail |
|---|---|
| Product Type | Ceramic submersible hydrostatic level sensor, SDI-12 digital output |
| Sensor Technology | Ceramic (Al2O3) piezo-resistive |
| Digital Interface | SDI-12 version 1.4, up to 9 sensors per bus |
| Measurements | Level and temperature |
| Level Ranges | 5, 10, 20, 30, 50, 100 mWG |
| Pressure Reference | Gauge (standard), sealed gauge, absolute |
| Accuracy | ≤ ±0.25% or ≤ ±0.10% FS |
| Safe Overpressure | 1.5 x rated range |
| Burst Pressure | 3 x rated range |
| Long Term Stability | ≤ ±0.10% FS |
| Supply Voltage | 6 to 36 VDC |
| Current Consumption | < 250 µA idle, < 4 mA active |
| Signal Processing | 16-bit microprocessor with density correction |
| Thermal Effects | ±0.01% FS/°C typical |
| Housing Material | 316 stainless steel or marine bronze CA104 |
| Sensor Material | Ceramic Al2O3 |
| Seals | FKM, EPDM or NBR |
| Compensated Temperature | 0 to +40 °C |
| Media Temperature | -10 to +60 °C, non-freezing |
| Cable | PUR submersible cable with internal vent tube, terminated in tails |
| Cable Connection | G1/4 DIN 3852 male thread when nose cone is unscrewed |
| Ingress Protection | IP68, fully submersible to 100 m |
| Surge Protection | Internal protection; external protection devices recommended |
| Weight | Sensor < 300 g; cable 48 g per meter |
| Conformity | CE |
| Accessories | USB communications interface, vented junction box, cable hanger |
SLS-CD Ceramic SDI-12 Level Sensor FAQs
What is the difference between the SLS-CD and the SLS-SD?
Both are SDI-12 level sensors reporting level and temperature. The SLS-CD uses a ceramic sensing element and is available in marine bronze for aggressive and saline liquids. The SLS-SD uses a silicon element for clean water, with lower ranges and higher accuracy.
Is the SLS-CD suitable for seawater?
Yes. Specify the marine bronze CA104 housing for seawater and brackish water applications.
How many sensors can I connect to one data logger port?
Up to nine SLS-CD sensors can share a single SDI-12 bus, each with its own address.
What supply does the SLS-CD need?
A 6 to 36 VDC supply. It draws less than 250 µA when idle and less than 4 mA when active.