Nortek Multi Parameter Probe: 07/2012

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, 2 July 2012

All that glitters ain't gold.

As mentioned before, the biggest problem for optical sensors is bio-fouling. Anything that grows on the face of on of the sensors will mess up the measurement. Our major weapon against all the fouling is of course our wiper. But an additional attempt to keep underwater lifeforms away is made by adding a brass plate. Brass is a copper-zinc alloy that is known for the fact that it limits the growth of bio-fouling. And when it has not touched the water yet, like in the picture above, it looks very nice. Let's hope it still looks good after a few months.