SSA Road Condition Sensor
- Manufacturer: Nesa
- Category: Meteorology – Climatology, SENSORS, Visibility and condition of the road
The NESA SSA is a walk-through sensor for measuring the physical and chemical characteristics of the road surface. It allows for determining the condition of the road surface and distinguishes between dry, damp, wet, icy, snowy, and salty conditions, in addition to measuring temperature and assessing critical moisture levels.
Its operating principle is based on the variation of electrical conductivity, detected with a series of precision electrodes. It has a temperature measurement range of -30 to +70°C and a water film thickness of 0 to 4 mm, with an RS485 digital output.
Key points
- Temperature measurement range -30 ÷ +70°C; water film 0÷4mm
- Sensitivity and resolution 0.1mm
- Freezing point curves 1÷10 (NaCl, CaCl, MgCl) from -20 ÷ 0°C, max. error ±1°C
- RS485 digital output; 12÷24Vdc power supply, <8mA@12Vdc
- IP68; operating temperature -40 ÷ +70°C, 0 ÷ 100%RH
- Metal casing and reinforced, walkable ABS body; 120 x 50 mm; 0.8 kg
Technical Frequently Asked Questions
What does the SSA measure?
The physical-chemical characteristics of the road surface: temperature, water film of 0 to 4 mm and pavement condition (dry, damp, wet, ice, snow, residual salt).
What is their measure based on?
In the variation of electrical conductivity induced by the physical phenomena present on the measurement surface, detected with a series of precision electrodes.
What's the way out?
Digital RS485.
How do I order it?
Sensor (SSA) and cable (05, 10 or xx m sensor-datalogger). Manufacturer's example: SSA 10.
Properties
| Feature | Specification |
|---|---|
| Measurement and operating principle | |
| Measurement principle | Variation of electrical conductivity induced by physical phenomena present on the sensor's measuring surface; a series of precision electrodes detects the conductivity |
| Temperature measurement field | -30 to +70°C |
| Water film measurement range | 0÷4mm |
| Sensitivity and resolution | 0.1mm |
| Freezing point curves | 1÷10 (NaCl, CaCl, MgCl) from -20 ÷ 0°C, max. error ±1°C |
| Temperature accuracy | 0.2÷0.5°C |
| Water film accuracy | 0.1 mm + 20% of the measured value |
| Ability to recognize | Temperature, dry, wet, humid, critical humidity, ice, snow, residual salt |
| Regulatory compliance | EC |
| Exit sign | |
| Exit sign | Digital RS485 |
| Power supply, environment, and mechanical data | |
| Feeding | 12÷24Vdc |
| Consumption | <8mA@12Vdc |
| Operating temperature | -40 to +70°C |
| Operating humidity | 0 ÷ 100%Rh |
| Degree of protection | IP68 |
| Material | Metal housing and sensor body in reinforced, walkable ABS |
| Dimensions | 120 x 50 mm |
| Weight | 0.8kg |
| Reference | Configuration |
|---|---|
| SSASSA | Output: RS485 · Description: Passive road surface condition sensor with isolated RS485 interface |
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