The Flow Probe is a highly accurate water velocity instrument for measuring flows in open channels and partially filled pipes. The water velocity probe consists of a protected water turbo prop positive displacement sensor coupled with an expandable probe handle ending in a digital readout display. The water flow meter incorporates true velocity averaging for the most accurate flow measurements. The Flow Probe is ideal for storm water runoff studies, sewer flow measurements, measuring flows in rivers and streams, and monitoring water velocity in ditches and canals. Turbo-Prop Sensor Water Velocity Computer Flow Probe Handle True Velocity Averaging Optional Swivel Head Optional Alignment Fin
Range; 0.3-19.9 FPS (0.1-6.1 MPS)
Features
Overview
The Flow Probe incorporates the unique Turbo-Prop propeller sensor, which uses the most accurate positive displacement technique available for velocity sensing. The Turbo-Prop is designed to shed debris and is protected inside a 2 inch diameter housing. The probe housing may be placed directly on the bottom of a pipe or streambed for measuring low flows down to 50mm in depth. The flow meter propeller rotates freely on its bearing shaft with no mechanical interconnections for minimal friction.
The water velocity computer receives an electrical signal from the propeller, amplifies the signal, and converts the reading to meters per second. The large LCD screen displays average, minimum, and maximum water velocity readings. Up to 30 sets of minimum, maximum, and average data readings can be stored in the water velocity computer. These data points can be reviewed on the computer screen for later analysis.
The Flow Probe handle can telescope from 1.1m to 1.8m in length (FP111), 1.7m 4.6m (FP211), or 0.75m to 1.7m (FP311). The handle is constructed of anodized aluminum for light weight and long life. The FP211 is ideal for measuring sewer flows from street level and measuring stream flows from low bridges. The FP311, Flow Probe, is ideal for carrying into remote flow monitoring areas. A mylar coated staff gauge (graduated in hundredths of a foot and centimeters) is attached to the lower section of the water velocity probe for instant water depth measurements and accurate propeller positioning.
The Flow Probe can be used to measure the true average water velocity of a channel's flow. One reading is taken per second, and a continuous average water velocity is displayed. To obtain the true average velocity the flow probe should be slowly moved throughout the cross sectional area being measured. Once the reading becomes steady, the true average water velocity of the cross sectional area is obtained. This allows for highly accurate flow measurements, which average the differences in velocities that occur throughout a flow's cross-section and with water surges over time.
The Flow Probe Swivel Head option allows you to rotate the flow probe's turbo prop to + 90 degrees from it's standard position. This option lets the flow probe take water velocity measurements in hard to measure areas such as vertical pipes on water tanks or swimming pool drainage systems.
Significant errors can occur when measuring water flow other than directly parallel to the direction of flow. The Global Water Flow Probe Alignment Fin is designed to help orient the flow probe parallel to flow when the end of the probe can't be seen well due to the depth or cloudiness of the water. Technical
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: 0.9 kg (FP111), 1.4 kg (FP211), 1.3 kg (FP311)
Expandable Length; 1.1 to 1.8 m (FP111), 1.7 to 4.6 m (FP211), 0.76 to 1.7 m (FP311)
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 with typical use.
Auto Shutoff; After 5 minutes of inactivity
Operating Temperature; -20° to 70° C
Carrying Case; The Flow Probe is shipped in a padded carrying caseDocuments