The Global Water 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 - 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
2 inches in depth. The flow meter propeller rotates freely on its bearing shaft
with no mechanical interconnections for minimal friction. Magnetic material
in the propeller tip passes a pickup point in the water velocity meter handle
producing electrical impulses that are carried to the readout display by an
internal cable. The Turbo-Prop is easily removed for cleaning or replacement.
NOTE: Global Water recommends recalibrating the water velocity computer every
time the Turbo-Prob sensor is replaced. Contact our Technical Support department
for more details.
Water Velocity Computer - The water velocity computer receives an electrical
signal from the propeller, amplifies the signal, and converts the reading to
feet per second (or meters per second, depending on programming). 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 water velocity computer has a water-resistant housing
and incorporates a unique four-button operation for changing functions and resetting
the display. The water velocity computer is powered by a non-replaceable battery
that will last approximately five years with normal use. Low battery warnings
will also display as appropriate.
Flow Probe Handle - The Flow Probe handle can telescope from 3.7 feet
to 6 feet in length (FP111), 5.5 feet to 15 feet (FP211), or 2.5 feet to 5.5
feet (FP311). The handle is constructed of anodized aluminum for light weight
and long life. The 15 foot length of the FP211, Flow Probe, allows for measuring
sewer flows from street level and measuring stream flows from low bridges. While
the 2.5 foot collapsed length of the FP311, Flow Probe is ideal for carrying
into remote flow monitoring areas. A 3-foot (1.7-feet for the FP311) 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.
True Velocity Averaging - The Flow Probe can be used to measure the
true average water velocity of a channel's flow. As long as the turbo-prop sensor
is in the water flow, the computer will average the water velocity. 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 average water velocity can be saved by pressing the SAVE button and reviewed
later.
Optional Swivel Head - 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.
Optional Alignment Fin - 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. To use this accessory, immerse the flow probe and rotate it back
and forth until the least amount of resistance is felt due to the water flowing
past the alignment fin.
Flow Probe 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) (FP111), 3 lbs. (1.4 kg) (FP211), 2.8 lbs.
(1.3 kg) (FP311)
- Shipping: 13 lbs. (5.9 kg) (FP111), 23 lbs. (10.4 kg) ((FP211), 19
lbs. (8.6 kg) ((FP311)
Expandable Length: 3.7 to 6 ft (1.1 to 1.8 m) (FP111); 5.5 to 15 ft (1.7
to 4.6 m) (FP211); 2.5 to 5.5 ft (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,
Non-Replaceable
Auto Shutoff: After 5 minutes of inactivity
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
Flow Probe Options
GWFP111 Flow Probe - (3.7 to 6 ft handle) including carrying case. Note pole
color of shipped instrument may be different than shown.
GWFP211 Flow Probe - (5.5 to 15 ft handle) including carrying case. Note pole
color of shipped instrument may be different than shown.
GWFP311 Flow Probe - (2.5 to 5.5 ft handle) including carrying case. Note pole
color of shipped instrument may be different than shown.
GWFP111-S Flow Probe - (3.7 to 6 ft handle w/swivel) including carrying case.
Note pole color of shipped instrument may be different than shown
GWFP211-S Flow Probe - (5.5 to 15 ft handle w/swivel) including carrying case.
Note pole color of shipped instrument may be different than shown.
Replacement Flow Probe Parts
Digital Flow Computer (PN# GWBA2000)
Turbo-Prop Replacement Kit (PN# GWBG0000) - Includes propeller, mounting shaft,
and instructions. NOTE: Global Water recommends recalibrating the Digital Flow
Computer after replacing the Turbo-Prop.
Flow Probe Accessories
FP-FIN Flow Probe Alignment Fin Kit (PN# GWBA2010) - Includes alignment fin
and mounting hardware.
