KOBOLD Instruments Inc • 1801 Parkway View Drive • 15205 Pittsburgh, PA • Tel: +1 412 788 2830 • E-mail: Please activate JavaScript visit koboldusa.com

bgf-durchfluss.png: Full Metal Variable Area Flowmeter / Counter BGF

Full Metal Variable Area Flowmeter / Counter BGF

For horizontal and vertical mounting

Measuring / switching range:
10 - 100 ... 4000 - 40000 l/h water
0.3 - 3.0 ...110 -1100 Nm³/h air
Connection: flange DN15 ... DN100, ANSI ¾ ... 4"
Material: stainless steel 1.4404, option PTFE-lining
pmax: PN40 (16) bar, on request max. PN600 bar
Temperature range:
-40 ... +200°C (-40 ... +350°C on request)
Accuracy: ±2 % of full scale
Options: contacts, analogue output, totalizer, Hart®,
Profibus® PA, ATEX


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324 KB


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II 1G Ex ia IIC T6...T1 Ga
II 2G Ex ia IIC T6...T1 Gb

3,8 MB
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II 1G Ex ia IIC T6...T1 Ga
II 2 G Ex ia IIC T6...T1 Gb

3,0 MB
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II 2G Ex ia IIC T6...T1 Gb

812 KB
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II 1G Ex ia IIC T6...T1 Ga
II 2G Ex ia IIC T6...T1 Gb

1,1 MB
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II 1D Ex iaD 20 T...°C

1,3 MB
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Ignition Hazard Assessment

87 KB
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IECEx BVS 16.0072

Ex ia IIC T6 Gb

514 KB


Inside the flow tube, there is a star guided float which works towards a spring. An annular gap is produced between the coneshaped magnet system and the meter ring in case of flows other than zero. The position of the magnet system depends on the resulting force of all forces acting upon it. These forces comprise the flow force, a spring force acting opposite to the flow force,  and the buoyancy and weight force significant for the measurements in case of vertical installation.

Each position of the magnet holder corresponds to a flow value measured during  calibration, which is transferred to a scale. The BGF flowmeter consists of a meter tube with connections, a meter ring, and a conical magnet holder. By means of a magnet, the position of the magnet system is transferred to an encapsulated follow  magnet, which has been fitted to a pointer axle. The position of a second annular follow magnet fitted on the pointer axle is transferred to the scale by means of the pointer.

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