Flowatch®
This particularly competitively priced instrument has been developed for use in difficult conditions. Thanks to its various helixes, it offers measurement solutions in virtually all cases, whether for measuring liquid flows.
Fields of application
River current measurement
Hydrological studies
Irrigation channels
Tidal flow
Waste water drainage
Flowatch® - Technical data
Speed measurement - Standard size propeller
| Measurement units | km/h, m/s, cm/s, mph, fps, knots and Beaufort |
| Resolution | 0.1 for all units (except cm/s: 3 cm/s) |
| Maximum speed | 150 km/h (except cm/s: 999 cm/s) |
| Diameter (gas) | Ø 20mm |
| Through hole | Ø 33mm |
| Measurement range | from 1 to 30 m/s |
| Minimum sensitivity | < 3 km/h - < 1 m/s |
| Precision | ± 2% FS |
| Off-axis error | ± 30° / ± 3% FS |
| Operating temperature | -50°C to +100°C |
Speed measurement - Small propeller
| Measurement units | km/h, m/s, cm/s, mph, fps, knots and Beaufort |
| Resolution | 0.1 for all units (except cm/s: 3 cm/s) |
| Maximum speed | 150 km/h (except cm/s: 999 cm/s) |
| Diameter (gas) | Ø 12mm |
| Through hole | Ø 18mm |
| Measurement range | from 1 to 30 m/s |
| Minimum sensitivity | < 3 km/h - < 1 m/s |
| Precision | ± 2% FS |
| Off-axis error | ± 10° / ± 3% FS |
| Operating temperature | -50°C to +100°C |
Speed measurement - Water propeller
| Measurement units | km/h, m/s, cm/s, mph, fps, knots and Beaufort |
| Resolution | 0.1 for all units (except cm/s: 3 cm/s) |
| Maximum speed | 150 km/h (except cm/s: 999 cm/s) |
| Diameter (gas) | Ø 60mm |
| Measurement range | from 0.1 to 10 m/s |
| Minimum sensitivity | < 0.3 km/h - < 0.1 m/s |
| Precision | ± 2% FS |
| Off-axis error | ± 20° / ± 3% FS |
Temperature measurement
| Measurement units | °C, °F, °C felt and °F felt |
| Thermometer accuracy | ± 0.2°C |
| Resolution | ± 0.1°C |
| Functions | measurement of ambient, perceived, minimum, average and maximum temperature |
Storage and transport case (kit 1)
Storage and transport bag (kit 2)
Telescopic aluminium probe with 1.2 metre cable. Temperature sensor at end of probe. Total probe length: 1.2 metres (included in kit).
Compact probe for using the Flowatch as a hand-held anemometer
Ø 20 mm gas propeller, Ø 33 mm through-hole (included in kit)
Ø 12 mm gas propeller, Ø 18 mm through-hole
Ø 60 mm water propeller (included in kit)
Probe with weighted propeller at the end of a 15-metre cable for measuring the speed of river or marine currents
Easyflow
Extremely compact and lightweight, the EasyFlow is the ideal instrument for measuring the flow of torrents or wild watercourses. It is designed for professionals who occasionally take measurements and don't need to record several sites. It takes just a few minutes to measure a flow using the tracer dilution method.
EasyFlow is a highly ergonomic, waterproof instrument with a conductivity probe and 10 m cable. It comes in a nylon shoulder bag with 3 calibration doses, EasyViewer software, a memory aid and a USB communication cable. So it's easy to carry around.
The EasyViewer software enables data to be transferred to a PC, the gauging curve to be viewed and, if necessary, the flow rate calculation to be corrected. It is very useful, even necessary, to check the quality of the gauging by viewing the curve.
Main software functions:
- Loading measurement data from EasyFlow
- Display of the gauging curve and possibility of graphically correcting the flow calculation
- Addition of information on gauging, such as water level height
- Software in three languages: German, English or French
EasyFlow - Technical data
Salinity
| Measurement range | 0 - 3200 mg/l |
| Sensitivity | 1 mg/l |
| Precision | < 3% |
| Salt quantity (min - max) | 1g - 100 kg |
Temperature
| Measurement range | 0 - 40 °C |
| Absolute accuracy | ± 0,2 °C |
Flow
| Precision (optimum mix): | < 5 % |
| Display unit capacity: | 0.1 l/s - 99,900 l/s |
Miscellaneous
| Power supply | 3 x 1.5 V type AA, AM3, LR6 alkaline batteries |
| Autonomy | ~ 100 hours in normal service |
The principle of the tracer dilution (or integration) method involves injecting a certain volume of tracer into the flow. Downstream, at a sufficient distance to ensure good mixing, the concentration of this tracer in the watercourse is measured. The flow rate is then obtained by integrating the concentration over time.
Using this method, a single person can measure the flow of a watercourse in less than an hour, whereas an identical measurement using a reel would be much more tedious and would easily take 2 to 3 hours.
Our EasyFlow device uses this method by dilution with cooking salt as a tracer. They are fitted with a probe that measures the conductivity of the water, which is linearly proportional to the concentration of salt dissolved in the water.
Cooking salt has the advantage of being highly dilutable in water, non-polluting and absorbed very little by vegetation and riverbed materials. What's more, its low cost and ease of supply make it an ideal tracer.
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