Combined Speed-Direction
Anemometer |
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Combined Speed-Direction
Anemometer |
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The CombiSD is an instrument that combines sensors for measuring both wind speed and direction in a single unit. In addition to its advantages in terms of robustness, lightness, overall dimensions and lower cost with respect to systems using two separate units, installation and wiring are also simplified and easier to carry out. The CombiSD speed-direction anemometer is available in versions with direct output from the main sensors or with output using normalised signals. The DNA022 model, with direct output and low energy consumption, and destined for use in systems with limited energy supplies such as those fed via solar panels, is of particular interest. Each measurement system is composed of a sensor chosen from the VERSIONS table, the two rotors DNA024 and DNA027, and a shielded cable DWA… chosen from the SPARES AND ACCESSORIES table. The MG2251 connector must be used in cases where the user wishes to make up his own cable. |
| VERSIONS |
part codes |
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| Power
supply and consumption: Output: |
5Vdc (20mA) direct Hz/ Ohm |
12Vdc (2mA) direct Hz/ Ohm |
12Vdc (30mA*) 2 x 4 ÷ 20mA Rmax=360 Ohm |
12Vdc (30mA) 2 x 0 ÷ 5V |
| Speed-direction sensor with direct output: | DNA021 |
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| Speed-direction sensor with direct output and low energy consumption: | DNA022 |
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| Speed-direction sensor with normalised output: | DNA521 |
DNA527 |
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| SPARES AND ACCESSORIES |
| Description | Code |
| Rotor with cups for speed section: | DNA024 |
| Weather vane rotor for directional section: | DNA027 |
| 7-wire shielded cable L= 10 m with connector: | DWA510 |
| 7-wire shielded cable L= 25 m with connector: | DWA525 |
| 7-wire shielded cable L= 50 m with connector: | DWA526 |
| 7-wire shielded cable L=100 m with connector: | DWA527 |
| Trailing connector: | MG2251 |
| Cable L=4 m for connecting portable Babuc instruments (A.M.E): | BSH205 |
| Fixture for mounting DNA021 aeolian sensor on BVA304 tripod | BVA307 |
| Weather vane rotor fixing screw: | MC1040 |
| Set of 2+2 spare bearings: | 2 x MM2011 + 2 x MM2015 |
| Anemometric optoelectronic speed element: | ML653 |
| Anemometric direction potentiometer: | ML501 |
| MECHANICAL AND ELECTRICAL SPECIFICATIONS |
| Principle of operation: | Anemometer with 3 cups and weather vane |
| Main speed sensor: | Optoelectronic with 32-step disk |
| Main direction sensor: | 2000 Ohm wire potentiometer |
| Housing: | Heavy gauge anodised aluminium, painted with epoxy-resin |
| Shaft carriers: | Low-torque stainless steel bearings |
| Protection (vertical position): | IP65 |
| Mounting: | On 48 ÷ 50 mm f mast |
| Electrical discharge protection: | Transzorb on output terminators |
| Electrical outlet terminators: | IP65 watertight connector |
| Weight (instrument with the two rotors) | 950 gr |
| PHYSICAL AND OPERATIONAL SPECIFICATIONS |
| Damage threshold: | >75 ms-1 |
| Operating temperature: | -30°+70°C |
Speed: |
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| Measurement range: | 0 ÷ 60 ms-1 |
| Threshold: | 0.4 ms-1 |
| Response time (63% at 12 ms-1): | 2,5 s |
| Delay path (63% at 1.1 ms-1): | 7.7 ms-1 |
| Speed resolution: | @0.05 ms-1 |
| Transfer function (direct output): | Vel.(ms-1) = F(Hz)/18.67 |
| Linearity: | 1.5% of reading |
| Accuracy: | 2% of reading |
Direction: |
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| Measurement range: | 0 ÷ 360° (electrical 0 ÷ 356°) |
| Threshold: | 0.4 ms-1 |
| Response time (63% at 4 ms-1): | 0.75 s |
| Delay path (63% at 4 ms-1): | 3 m |
| Logarithmic dampening (at 4 ms-1): | d= ln(a/b)= 1.9 |
| Wavelength (at 4 ms-1): | l = 7.4m |
| Transfer function (direct output): | Dir(°)= 360 x R(Ohm)/2000 |
| Linearity: | 0.5% of f.s. |
| Accuracy: | 1% of f.s. |
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