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# SPOTTER PLATFORM

### Salinity Sensor

Add a compact, inductive conductivity sensor to your Spotter Platform to monitor salinity and water density in real time. Measure conductivity with exceptional stability, minimal drift, and solar-rechargeable power to track ocean mixing and stratification.

[**Explore Configuration**](https://spotter-configurator.sofarocean.com/?preset-sensor=conductivity-salinity&step=3&source_page=salinity-sensor)

### Sensor Specifications

[**Download the Spec Sheet**](https://5311899.fs1.hubspotusercontent-na1.net/hubfs/5311899/Spec%20Sheets/Salinity_Sensor_Spec_Sheet.pdf)

**Sensor**  
Aanderaa Conductivity Sensor 5990B

**Sensor Type**  
Inductive Conductivity & Temp (CT)

**Conductivity**  
**Range**  
0 - 7.5 S/m (0 - 75mS /cm)  
**Resolution**  
0.0002 S/m (0.002 mS/cm)  
**Accuracy**  
±0.018 mS/cm  
**Typical Drift**  
<0.0001 S/m per month (0.001 mS/cm per month)  
**Response Time (90%)**  
< 0.5 sec*  
**Salinity Accuracy (at 15.0 °C and 42.0 mS/cm)**  
0.06 PSU

**Temperature**  
**Range**  
–5 to 40 °C (23 to 104 °F)**  
**Resolution**  
0.001 °C (0.0018 °F)  
**Accuracy***  
±0.05 °C (0.032 °F)  
**Response Time (63%)**  
< 1.2 seconds

\* Dependent on flow through cell bore  
\*\* Calibrated range is 0 to 36 °C (32–96.8 °F)  
\*\*\* For highest accuracy the sensor has dual temperature - internal and external

##### Additional Specifications

**Sampling Interval**  
2 sec - 255 min

**Maximum Depth**  
50 m

**Weight**  
0 - 7.5 S/m (0 - 75mS /cm)

**Size (Dia. x Len.)**  
~36 mm × ~122 mm

**Materials**  
Epoxy coated titanium

**Interface Standard**  
Bristlemouth-enabled

**Power Supply**  
Spotter’s Li-ion battery (solar-rechargeable)

## Deployment & Best Practices

**Configuration Options**  
Ideal for moored coastal deployments with one Spotter or a network. Integrate up to two more devices (e.g. oxygen/acoustics) per Smart Mooring (max 3 total).

**Remote Configuration & Controls**  
Direct control via Spotter Dashboard, binary/ASCII commands, and Sofar remote support.

**Maintenance**  
Rinse with fresh water after retrieval.

[Explore Configuration](https://spotter-configurator.sofarocean.com/?preset-sensor=conductivity-salinity&step=3&source_page=salinity-sensor)

## Data Access & Analysis

**Spotter Dashboard**  View real-time data and insights

**API Access**  Retrieve data programmatically with our secure API

**Onboard Storage**  Download data via SD card for offline analysis

**Transmission**  Satellite and cellular options