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Background Information
The E-M Flowmeter tool is used in the environmental and hydrology industries to measure fluid movement in a borehole. It incorporates
Quantum Engineering’s "EBF" electromagnetic sensor,
The instrument measures flow rates using the principal of Faraday's Law of
Induction. The downhole probe consists of an electromagnet and two
electrodes located 180 degrees apart and 90 degrees to the magnetic field inside
of a hollow cylinder. The voltage induced by a conductor moving at right
angles through the magnetic field is directly proportional to the velocity of
the conductor (water) through the field. The tool is capable of measuring low velocity flow rates down to less than 50 ml/min and increased flow rates to 40 liters/min, through the tool's 1 inch inside diameter sensor. When using the tool to measure low velocity flow rates a rubber skirt is attached to the outside of the sensor to block off the bore hole and force the fluid to pass through the 1 inch diameter opening inside the sensor coil. The Compu-View Software program is designed to allow the automatic collection of data at selected static stations in the borehole. When measuring faster flow rates the rubber skirt is typically removed and the tool is run in either the static station or dynamic mode. The tool has no moving parts.
| Features |
| Properties Measured (see diagram) |
Tool Specifications |
1. Flowmeter: Electromechanical
Offset: 139.7 cm (55.0 in.)
2. Fluid Resistivity: Offset: 139.7 cm (55.0 in.)
3. Temperature & Delta Temperature :
Offset: 139.7 cm (55.0 in.)
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Length: 142 cm (56.0 in.)
Temperature: 60 C (140 F)
Diameter: 41.3 mm (1.625 in.)
Sensor Housing: 50.8 mm (2.0 in.)
Weight: (13.5 lbs.)
Tool Voltage Required: 64 VDC
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| Sensor Response Ranges |
| Sensor |
Response Limits |
Accuracy |
| Flowmeter (EMF) |
50 ml./min. to 40 liters./min. |
+/-20 ml/min. (High Gain) |
| Temperature (TEMP) |
0 C to 60 C (32 to 140 F) |
+/-5% |
| Fluid Resistivity (FR) |
0-100 ohm meters |
+/-5% |
| Tool Informaiton |
| Item |
Model # |
Part # |
| Tool with EMF, TEMP, FR |
9721 |
300000 |
| (included) 6.5 in. Diameter Flow Diverter Skirt (modifiable for use in hole from 3.75 in. to 6.25 in. diameter) |
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| (included) Centralizer |
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| (included) Weighted Section |
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