Nortek Multi Parameter Probe: 05/2012

Nortek Multi Parameter Probe

The Nortek Multi Parameter Probe is a stand alone water-quality data collection system for use in harsh environments. Basically it is a combination of field-proven sensors packaged in a robust delrin and brass frame. Data collection and control is handled by a standard Campbell Scientific CR-800 datalogger, packaged in a sturdy PE-plastic pressure housing. This provides a proven stable platform for data collection and retrieval and allows for easy customisation. Data is logged internally or may be output in a NMEA compatible format over RS-232. Data can also be read from the instrument using the SDI-12 or Modbus protocols. When a GPRS modem is connected all data is automatically sent to an FTP server.

Supported sensors:
- CS547 Conductivity / Temperature
- OBS-3+ Optical Backscatter
- CS525 ISFET pH probe
- InsiteIG Dissolved Oxygen/Temperature
- Valeport miniCT (replaces the CS547)
- Ponsel OPTOD-Dissoved Oxygen Sensor
- Chelsea Instruments TriLux - Blue-algea, Chlorophyll, Turbidity
- Ponsel C4E - Conductivity / Temperature

Internal sensors:
- Pressure (optional)
- Internal temperature
Derived parameters:
- Salinity
- Dissolved oxygen in mg/l

Monday, 21 May 2012

Revision 2: The Quest for Blue-Algae

Algae bloom in Lake Atitlán, Guatemala

After shipping the first series of the NMPP there has not been much follow-up. But the project is active again since we now have to supply three systems for inland water quality monitoring. Here the focus is on measuring algae, and specifically blue-green algae or Cyanobacteria.
Algae can be measured using fluorometry. The algae are lit by a an LED transmitting light at a specific wavelength and respond to that by transmitting light in a different wavelength which in turn can be detected by the sensor. These fluorenscence sensors have been used in laboratories for years but have now also become quite common in field measurements.
So the next revision of the NMPP will have to measure the following parameters:

Blue Algae
Chlorophyll
Turbidity
Dissolved Oxygen
pH
Temperature
Conductivity