Flowatch®
This particularly competitively priced instrument has been developed for use in difficult conditions. Thanks to its various helixes, it offers measurement solutions for virtually any application, whether measuring gas or liquid flows. An intrinsically safe probe is also available for natural gas measurements.
Fields of application
Natural gas
River current measurement
Irrigation canals
Wastewater discharge
Tidal flow
Hydrological studies
Ventilation ducts
Air conditioning
Chimney flues
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 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 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 | measures ambient, perceived, minimum, average and maximum temperatures |
Storage and travel case (kit 1)
Storage and travel bag (kit 2)
Telescopic aluminium probe, with 1.2-metre cable. Temperature sensor at the end of the probe. Total length of the probe: 1.2 metres (included in the kit).
Compact probe for using the Flowatch as a hand-held anemometer
Gas propeller Ø 20 mm, through hole Ø 33 mm (included in the kit)
Gas propeller Ø 12 mm, through hole Ø 18 mm
Water propeller Ø 60 mm (included in the 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, EasyFlow is the ideal instrument for flow measurement in torrents and wild streams. It is designed for professionals who occasionally carry out gauging and who do not need to register several sites. In just a few minutes, you can measure a flow using the tracer dilution method.
EasyFlow is ergonomically designed and perfectly waterproof, with a conductivity probe and 10m cable. It comes in a nylon shoulder bag with 3 calibration doses, EasyViewer software, a checklist and a USB communication cable. This makes it very easy to transport.
The EasyViewer software enables data transfer to a PC, visualization of the gauging curve and, if necessary, correction of the flow calculation. It is very useful, if not necessary, to check the quality of the gauging by viewing the curve.
Main software functions:
- Loading gauging data from EasyFlow
- Visualization of the gauging curve and possibility of graphically correcting the flow calculation
- Addition of gauging information, 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 precision | ± 0,2 °C |
Flow
| Precision (optimum mix): | < 5 % |
| Display unit capacity: | 0.1 l/s – 99’900 l/s |
Miscellaneous
| Power supply | 3 alkaline batteries 1.5 V type AA, AM3, LR6 |
| 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, we measure the concentration of this tracer in the watercourse. The flow rate is then obtained by integrating the concentration over time.
Thanks to this method, a single person can measure the flow of a river in less than an hour, whereas an identical measurement using a reel would be much more tedious and would easily take 2-3 hours.
Our EasyFlow device uses this method by diluting it with cooking salt as a tracer. They are equipped with a probe that measures water conductivity, which is linearly proportional to the concentration of dissolved salt 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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