水質分析空氣污染及環境保護監測儀器 Water Analysis and Environmental Protection
 
 

 
開放渠道及密閉管道用 雷達波非接觸式及電磁式流量計技術居世界領導地位
A Higher Level of Flow measurement for Open Channel and Closed Conduit Application

 

 

 

　

攜帶型電磁感應式 (Electromagnetic) 流量計
Flo-Tote™ 3 Portable Electromagnetic Flowmeter 

Building on the success of thousands of installations worldwide we are pleased to introduce the Flo-Tote 3 - the new generation of the world's most popular sewer flowmeter.

Marsh-McBirney's Flo-Tote 3 portable flowmeters are based on the original and unsurpassed velocity/area measurement sensors and techniques.  Continuous product innovation has made it possible to combine proven sensor design with state-of-the art technology.

In addition to the accuracy and ease-of-use our customers have come to expect the Flo-Tote 3 offers some exciting new features:
  • Disconnectable sensor for quick and easy replacement
  • Interchangeable with Flo-Dar sensors
  • 24 hour service turnaround to significantly reduce downtime
  • Room to store more data with a storage capacity increased to 64K
  • Extended battery life
  • Pocket PC compatible for data collection convenience



 Accuracy is Important!

Unlike Acoustic Doppler meters, the Marsh-McBirney electromagnetic area/velocity flowmeters measure both velocity and level in the same cross-section (or slice of pipe), a requirement necessary for accurate flow rate measurement using the continuity equation: 
Q = V x A.

Using measurements derived empirically over ten years, MMI has bridged the gap between the performance of its velocity sensor in a tow tank and its ability to calculate the average velocity that exists in an open channel sewer pipe. 

The flow accuracy of the Flo-Tote 3 is based upon the accurate measures of both velocity and level in hydraulic flow labs, as well as under actual sewer conditions in the field.

　
Flo-Tote 3 Specifications:

SENSOR

Velocity Measurement
   Method: Electromagnetic (Faraday’s Law) 
   Range: -5 to +20 feet per second (-1.5 to +6.1m/s)
   Accuracy: ±2% of reading, ± 0.05 zero stability at 0 to 
     +10 ft/sec (0 to + 3m/sec)
   Zero Stability: ±0.05 feet per second (±0.015m/sec)
   Resolution: 0.01 feet per second (± 0.003m/sec)

Level Measurement 
    Method: Submerged pressure transducer 
   Range: Standard 0.4 to 138 inches. (10mm to 3.5m)    
      Optional 0.4 to 276 inches 
   Accuracy: ±1% of reading 
   Zero Stability: ± 0.03 ft. (± 0.009m) zero stability for 
      0 to 10 ft (0 to 3m). Includes non-linearity, hysteresis 
      and velocity effects. 
   Resolution: 0.1 inch (2.5mm) 
   Over Range Protection: 2 X range

Flow Measurement 
    Method: Conversion of water level and pipe size to fluid 
      area. Conversion of local velocity reading to mean 
      velocity. Multiplication of fluid area by mean velocity 
      to equal flow rate. 
   Conversion Accuracy: ±5.0% of reading. Assumes 
      pipe is 10 to 90% full and with a level greater than 
      2 inches

Temperature Measurement: 
    Method: 1 wire digital thermometer 
   Range: 14º to 185ºF (-10º to 85º C) 
   Accuracy: ± 6 F (3.5C) degrees 

Material 
    Standard: Polyurethane 
   Dimensions: 5 3/16"(131.8mm) L, 1 ¾ " (44.5mm)W, 
      1 1/8" H (29mm) 
   Weight: 2.5 lbs. (with 30 feet of sensor cable) 
   Operating Temperature Range: 32° to 113° F 
      (0° to 45° C) 
   Storage Temperature: -4º to 125º F (-20° to 52°C)

Sensor Cable 
    Material: Polyurethane jacketed 
   Standard Length: 30 ft. (9m) 
   Optional Length: 60 ft. (18m),100 ft. (30m) or length 
      as needed (maximum 1000 ft/300m)

　

　

　

　

Flow measurement is based on the equation:

Q = V x A where 

Q = Flow 
V = Average Velocity
A = Area.

The measurement of both velocity and level in the same cross-section of pipe is critical for accurate flow rate determination, including surcharge conditions.

　

FLO- LOGGER

Data Storage
   64K (16K cycles of velocity/level data) 

Local Terminal
   RS232C at 19.2K baud

Power Requirements 
   Two 6-volt lantern batteries

Battery Life
   Typical - 16 weeks at a sample interval of 15 minutes 
      (with recommended batteries)

Housing
   Sealed watertight PVC – meets IP68 rating
   Length: 13.85 in. (35.179 cm)
   Diameter: 7.75 in. (19.685 cm)
   Weight: 7.5 lbs. (3.4 kg) (including batteries)
   

Temperature
    Operating Range: 14° F to 125° F (-10° C to 51° C)
   Storage Temperature Range: -4° F to 125° F 
      (-20° C to 51° C)

Sensor/Logger Disconnect
    Both the sensor and the logger have waterproof (IP68) 
      connectors for easy separation from the interconnecting
      cable.

Certification 
    FCC Rules Part 15 
   Industry Canada RSS 210 
   No user license required 


FLO-STATION

Data Storage 
    64K (16K cycles of velocity/level data) 

Local Terminal 
    RS232C at 19.2K baud 

Outputs 
    (4) 4-20 mA isolated outputs scaleable to desired values 
      and capable of sinking 50 ohms each. Contact Closure 
      (One form C dry).

Power Requirements 
    +12VDC @220 mA with three 4-20mA outputs @ 20Ma

Housing 
    NEMA 4X (IP66/67-7) 
   Material: Polystyrene 
   Dimensions: 9 in. W x 7 in. H x 4 in. D 
      (229 mm W x 178 mm H x 102 mm D) 
   Weight: 2.75 lbs. (1.25 kg) 

Temperature 
    Operating Temperature Range: 14° to 122°F 
      (-10° C to 50° C) 
   Storage Temperature Range: -4° to 122°F 
      (20° C to 50° C)

　

 

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