Highly accurate water velocity instruments for measuring flows in streams. The flow meters consist of the protected Turbo-Prop positive displacement sensor coupled by the expandable probe handle to the digital readout display and incorporate true velocity averaging for the most accurate flow measurements. They are ideal for storm water runoff studies, measuring flows in rivers and streams as well as ditches and sewers.

Turbo-Prop Sensor the unique Turbo-Prop propeller sensor uses the most accurate positive displacement technique for velocity sensing. The Turbo-Prop is designed to shed debris and is protected inside a 2" diameter housing. The probe housing may be placed directly on the bottom of pipes or stream beds for measuring low flows down to 50mm (2") in depth. The Turbo-Prop rotates freely on its bearing shaft with no mechanical interconnections for minimal friction. Magnetic material in the propeller tip passes the pickup coil in the housing producing electrical impulses which are carried to the readout display by an internal cable. The Turbo-Prop, the onlymoving part, is easily removed for cleaning or replacement.

Digital Readout Display The Digital Readout Display receives the electrical signal from the propeller, amplifies it and converts the reading to meters per second (or feet per second). The Readout displays instantaneous velocity and true average velocity. The Readout unit is completely waterproof and incorporates a unique two button operation for changing functions and zeroing the display. Internal watch type battery powers the unit continuously for one year and it is easily replaced. Also available on the Readout are maximum velocity, time-of-day and stop watch.

Probe Handle

The handheld flow meter handle of model 111 is telescoping and is expandable from 1.1... .1.8m in length (3 feet to 6 feet) or 1.7 ... 4.6m (5 feet to 15 feet) with model 211. It is constructed of anodized aluminium for light weight and long life. The flow probe may be easily extended to 25 feet in length using standard PVC pipe and an electrical extension cable. This allows sewer flow measurements from street level and measuring stream flows from the bridge.
True Velocity Averaging The Flow meter uses true velocity averaging. When the Readout is zeroed by pushing both buttons or when the probe is inserted into flowing water, a running average is started. As long as the probe remains in the flow, the averaging continues. Once the average reading becomes steady, the true average velocity has been obtained. When you pull the probe from the water, this average value is frozen on the display until reset.

Specifications

Range: 0.3-19.9 FPS (0.1-6.1 MPS)
Accuracy: 0.1 FPS
Averaging: True digital running average.  Updated once per second.
Display: LCD, Glare and UV Protected
Control: 4 button
Datalogger: 30 sets, MIN, MAX, and AVG
Features: Timer, Low battery warning
Sensor Type: Protected Turbo-Prop propeller with magnetic pickup.
Weight: Instrument: 2 lbs. (0.9 kg) (Model 111), 3 lbs. (1.4 kg) (Model 211)
Shipping: 13 lbs. (5.9 kg) (Model 111)), 23 lbs. (10.4 kg) ((Model 211)
Expandable Length: 3.7 to 6 ft (1.1 to 1.8 m) (Model 111)); 5.5 to 15 ft (1.7 to 4.6 m) (Model 211)
Materials:
Probe: PVC and anodized aluminum with stainless steel water bearing
Computer: ABS/Polycarbonate housing with polyester overlay
Power: Internal Lithium Battery, Approx 5 year life, Non-Replaceable
Operating Temperature: -4° to 158° F (-20° to 70° C)
Storage Temperature: -22° to 176° F (-30° to 80° C)
Carrying Case: The Flow Probe is shipped in a padded carrying case.
Approvals: CE