Nephelometer & Photometer Probe HFN-381
The probe has proved good quality of measurement in studying hydraulic arameters of aqiufers (hydraulic conductivity and transmitivity).
The sencor consists of a red LED as a source of monochromatic light and light-sensitive detector. The food colour Brilliant Blue, serial No. E133 is used as a tracer. That colour is on the EU list of allowed food colours, therefore the probe can be used in drinking water wells.
Due to a high sensitivity of photometric detector, very low concentrations of the dye (in the range betw. 10 to 20 mg/l) can be used, and the probe can measure vely low vertical and/or horizontal groundwater flows.
In contamination studies, the tracer has no interrerence with usually controlled and tested contaminants. The response of the probe is practically instantaneous (in order of seconds).
Probe Parameters
| Diameter |
50/38 mm |
| Length |
100 cm |
| Weigh |
4.0 kg |
| Max. Working Tem./Pressure |
75°C/15 MPa |
| Min. No. of Cable Conductors |
2 |
| Supply Voltage Range |
30 – 45 VDC |
| Max./Nom. Current Consumption |
100/50 mADC |
| Supply Voltage Polarity |
+ on central cond. |
| |
− on probe casing |
Photometer Parameters
| Measuring Range |
0 – 1 000 cps |
| Precission |
±5% |
| Communication (positive pulse) |
0 – 1 000 cps |
Thermometer Parameters
| Measuring range |
0 – 5 000 cps |
| Precission |
±5% |
| Communication (negative pulse) |
0 – 5 000 cps |
