The SNiP-SAL is a 'Sensor Node Integrated Package' for LoRaWAN or CAT-M1 communication of real-time salinity, TDS KCl, conductivity, and temperature measurements for continuous water quality monitoring.
The base SNiP-SAL integrates 1x S-NODE and 1x AWQ-C4E Conductivity/Salinity Sensor to a site’s unique network, communication and power requirements. The S-NODE can support an added 3x Sensors. The AWQ-C4E sensor has been designed to measure Salinity, TDS, Conductivity and Temperature.
The sensor uses 4 electrode technology: an alternating current of constant voltage is established between the primary pair of graphite electrodes. The secondary platinum electrodes allow for voltage regulation of the primary electrodes to reflect fouling.
The voltage measured between the primary electrodes is a function of the resistance of the material, and thus, the conductivity.
The C4E sensor stores calibration and history data within the sensor. This allows for a plug and play system without the need for re-calibration.
The C4E can be connected to most Dataloggers, Controllers, Automation Systems and Alarms via Modbus RS485 or SDI-12.
The S-NODE (for Environmental Monitoring) has been designed to support the broad suite of SDI-12 based environmental sensors. The S-NODE can support sensors with higher power requirements; a solar panel can charge either the internal lithium-ion battery or both the node and sensor can be powered by an external 12V system (e.g. battery or mains source).
A decoder suitable for TTN will be provided based upon sensor configuration.
|Measurement Principle:||Conductivity sensor with 4 electrodes (2 graphite, 2 platinum)|
|Resolution:||0.01 to 1, depending on range|
|Accuracy:||±1% of the full range|
|Response Time:||< 5s|
|Temperature Compensation:||NTC Thermistor|
|Sensor Interface:||Modbus RS-485 (standard); SDI-12 (optional)|
|Sensor Power Supply:||5 to 12 volts DC|
|Current Draw:||Standby: 25 μA
Average RS485 (1 measurement/second): 6.3 mA
Average SDI-12 (1 measurement/second): 9.2 mA
Current pulse: 500 mA
|Operating Temperature:||0°C to +50°C|
|Storage Temperature:||-10°C to +60°C|
|Dimensions:||Diameter: 27 mm; Length: 177 mm|
|Weight:||300g (sensor and 3 meter cable)|
|Material:||PVC, DELRIN, stainless steel|
|Maximum Pressure:||5 bar|
|Connection:||9 armoured connectors, polyurethane jacket, bare-wires or waterproof Fischer connector|