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HEAT-PULSE
GROUNDWATER FLOWMETERS
Kerfoot Technologies' GeoFlo heat-pulse groundwater flow meters allow quick, accurate on-site determination of both flow and direction, as opposed to other means. USGS maps show only general regional groundwater flow directions. Dye tracers require the installation of numerous wells and take extended time to determine direction and rate of flow. Head height in wells gives direction, but not rate, of flow and requires three wells for triangulation. No other means can determine flow at a single well.
Use for determination of:
• Hazardous waste plume track & source
• Fracture zone location
• Inflow-outflow analysis
• Water supply positioning & zones of contribution
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Model 40 Specifications:
12 volt and 18 volt DC battery-powered controller in rugged polyethylene box. Probe and cable on separate reel. Probe is separable from cable. Probe is inserted into glass bead-filled fuzzy packer and then deployed into wells by use of interlocking aluminum rods, oriented by attached compass. Eight thermistors (4 pairs) give most accurate horizontal flow determination.
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Range:
Rate accuracy:
Direction accuracy:
Probe Specifications:
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0.2 to 100 ft/day*
±10% (factory calibrated)
±5° (.020 wire-wrapped screen)
see Model 200 (below)
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Available cable depths: 50' to 450' (in 50' increments)
Control Box Specifications:
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Dimensions:
Weight:
Model 90 Specifications:
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12.5" L, 9" W, 9.5" H
18 lbs
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Controlled by laptop computer and 12 volt DC interface box electronics. Used for determination of vertical flow in wells or boreholes. Pneumatic packers pack off against well screen or boreholes, forcing flow through center of packer and across a pair of thermistors and centralized heat source. Deployed by means of interlocking aluminum rods.
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Range:
Rate accuracy:
Probe Specifications:
Probe Diameter:
Probe Length:
Weight:
Cable Length:
Cable Reel:
Interface Box Specifications:
Dimensions:
Weight:
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0.5 ml/min to 1 liter/min
±10% (factory calibrated)
1.75 inches
12 inches
4 lbs + cable weight (.536 lb/10 ft)
100, 200, and 450 ft available
12 lbs
11.02" L, 9.05" W, 4.33" H
15.5 lbs
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Model 200 Specifications:
Controlled by laptop computer and 12 volt DC interface box electronics. Used for determination of horizontal flow rate and direction. Probe is inserted into fuzzy packer filled with 2mm glass beads, which is then inserted into slotted well screen. Probe and packer unit deployed by means of interlocking aluminum rods, directed by attached magnetic compass. Probe has 4 thermistors (2 pairs).
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Range:
Rate accuracy:
Direction accuracy:
Probe Specifications:
Probe Diameter:
Thermistors:
Weight:
Cable Length:
Cable Reel:
Interface Box Specifications:
Dimensions:
Weight:
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0.5 to 100 ft/day
±10%
±7° (0.020 wire-wrapped screen)
1.75 inches
4 (2 pairs)
2.5 lbs + cable weight (1.14 lb/10 ft)
100, 200, and 450 ft available
12 lbs
11.02" L, 9.05" W, 4.33" H
15.5 lbs
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*Experienced users may obtain results as low as 0.1 ft/day with optimal conditions or in the natural formation.
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