Water Quality Monitoring

Application Notes

Application Background                                                                                                                                      Printer Friendly Version

Water quality monitoring is performed for water in streams, rivers, lakes and in the groundwater system, using bore holes.

Unidata-Water Quality moniroring Lakes

There are several different measures for water quality, for example electro conductivity (EC), pH ( PH) , dissolved oxygen (DO).

When measuring water quality, water depth and water flow can also be important factors.
Hence, instruments measuring these parameters like 6542D Hydrostatic depth probe or the 6526H Starflow instrument may be added to a water quality measurement station. In some instances turbidity of the water may also be measured.

Application Detail

Unidata supplies a wide range of water quality monitoring systems. In the example shown in the illustration, water conductivity, temperature, pH, dissolved oxygen and water depth are all measured.

This system combines a 6536E Water Electro-Conductivity instrument with a Neon Remote Terminal/ data logger which is connected to a central neon server via a telemetry link, either cell phone or satellite.

The 6536E Water Electro Conductivity instrument and the Neon Remote Terminal / data logger are set up using the local scheme / program to measure the instruments every one minute, and log the data every 5 minutes and then communicate the data to the central server every 1 or 2, 4 or 8 hours. The water conductivity probe is connected to the 6536E instrument via an SDI 12 bus, while the other instruments are connected to the Neon Remote Terminal / data logger via a field termination strip located in the waterproof enclosure.

Water Quality Monitoring Equipment

Ultra low-power consumption makes the 6536E and the Neon remote Terminal ideal for remote, unattended operation. This instrument will operate for up to 2 years from a small lithium battery package.
Installing the Neon Remote Terminal enables you to monitor data acquisition, reprogram the unit, and check the health of the site, all from a remote location using a web browser anywhere in the world.

The choice of telemetry option would be based on cellular coverage in the measurement area and costs associated with reporting the data back. Satellite services for these applications have reduced in price over the last 5 years, so satellite services are a reasonable option for such measurement stations

Unidata-Water Quality Measurement

The systems can be powered using lithium battery packs, or a small solar panel and battery.

Water Quality Monitoring Station

Like all Unidata systems you can connect many other sensors to the standard system. For example, the water quality may be affected by the rate of flow, so a 6526H Starflow could be used to measure the rate of flow. If the flow you intend to measure is shallow, you could use the depth measurement facility of the Starflow and omit the 6542D Hydrostatic Water Depth and Temperature Probe.

Typical Configuration

Options for Application Specific Instruments / InputsUnidata Part NumberDescription
Four Electrode Conductivity Instrument6536E4EL Water Conductivity Instrument
Four Electrode Water Conductivity Probe6536P-2-X4EL Water Conductivity Probe with 10m, 20m, 30m or 50m of cable
Hydrostatic Water Depth Probe6542D-XPT12 Pressure/Temperature Sensor SDI-12 3.5m, 10m or 20m
Hydrostatic Water Depth Probe - Titanium6542D-X-TTitanium PT12 Pressure/Temperature Sensor SDI-12 3.5m, 10m or 20m
Double Junction Teflon-pH Probe6528CpH Probe
Dissolved Oxygen Probe7422AO2 Probe
Options for Neon Telemetry - NRT / RTU / Field UnitsUnidata Part NumberDescription
Cellular RTU 3G2013F-AB03Neon Metering Module 3G with Antenna and Li Battery
Cellular RTU 4G2013F-AB04Neon Metering Module 4G with Antenna and Li Battery
Cellular RTU 3G - Industrial2016F-AB03Neon Remote Terminal 3G with Antenna and Li Battery
Cellular RTU 4G - Industrial2016F-AB04Neon Remote Terminal 4G with Antenna and Li Battery
Low Earth Orbit Satellite Globalstar2015E-AB0Neon Remote Terminal - Satellite Globalstar Modem with Antenna and three Li Batteries
Ethernet2017E-0B0-1 or 3NRT Ethernet with single or triple Ethernet Ports
with three Li Batteries
Equatorial Orbit Satellite - Inmarsat2018E-AB0-1 or 3NRT Ethernet with single or triple Ethernet Ports
with three Li Batteries
LCD Display2500ENRT LCD Display
NRT Field Termination Strip2103F2015E,2016F,2017E, and 2018E NRT FTS
NRT Firmware Option2303A-8M8M Extended Memory Option
NRT Firmware Option2303A-8M-CAM8M Extended Memory & Serial Camera Option
NRT Firmware Option2303A-CAMSerial Camera Option
Options for Neon Application Software - Customer ServerUnidata Part NumberDescription
Neon Application Software2302ANeon Server Software Licence Incl 5 NAL
Neon Application Software2302A-10Additional 10 NRT Access Licences
Neon Application Software2302A-20Additional 20 NRT Access Licences
Neon Application Software2302A-50Additional 50 NRT Access Licences
Options for Neon Application Software - Unidata ServerUnidata Part NumberDescription
Neon Application Software2301ANeon Data Initial Subscription Setup Fee
Neon Hosting Service2301A-01Neon Data Service Fee for 1-50 NRTs
Neon Hosting Service2301A-02Neon Data Service Fee for 51-100 NRTs
Neon Hosting Service2301A-10Neon Data Service Fee Metering
Options for Conventional Dataloggers / Field UnitsUnidata Part NumberDescription
Standards Starlogger6004D-11Red Logger 512K with Alkaline Battery
Display Starlogger6004D-21Blue Logger 512K with LCD and Alkaline Battery
Prologger7001D-11Green Logger 1M with LCD and Alkaline Battery
Micrologger8010C-EURMicrologger 512K
Starlogger Field Termination Strip6103E6004D FTS
Prologger Field Termination Strip7100E7001D FTS
Starlog V4 Management Software6308A-AUEStarlog V4 Full Licence Key